Western Hemisphere Research Articles

Initial clinical outcomes of robotic resection for perihilar cholangiocarcinoma: Is it safe and effective?

We aimed to describe our outcomes of robotic resection for perihilar cholangiocarcinoma, the largest single institutional series in the Western hemisphere to date. Between 2016 and 2022, we prospectively followed all patients who underwent robotic resection for perihilar cholangiocarcinoma. In total, 23 patients underwent robotic resection for perihilar cholangiocarcinoma, 18 receiving concomitant hepatectomy. The median age was 73 years. Operative time was 470 min with an estimated blood loss of 150 mL. No intraoperative conversions to open or other intraoperative complications occurred. Median length of stay was 5 days. Four postoperative complications occurred. Three readmissions occurred within 30 days with one 90-day mortality. R0 resection was achieved in 87% of patients and R1 in 13% of patients. At a median follow-up of 27 months, 15 patients were alive without evidence of disease, two patients with local recurrence at 1 year, and six were deceased. Utilization of the robotic platform for perihilar cholangiocarcinoma is safe and feasible with excellent perioperative outcomes. Further studies are needed to determine the long-term oncological outcomes.

Abstract PO3-10-11: Mujeres Avanzando a la Sobrevida (MAS: women going forward in survival): Breast Cancer Characteristics and Delays in Care in Honduras

Abstract Introduction: Low and middle-income countries have exceedingly high breast cancer mortality rates primarily due to delays to diagnosis and treatment. The Breast Health Global Initiative (BHGI) recommends a diagnostic interval (time from initial provider visit to receiving a diagnosis) of < 60 days. Honduras is one of the poorest countries in the western hemisphere and has a paucity of published breast cancer research. Our objective was to understand delays in breast cancer diagnosis and treatment in Honduras. Methods: We initiated a prospective cohort study (Mujeres Avanzando a la Sobrevida (MAS: Women Going Forward in Survival)) in 2021 at two hospitals in two major cities in Honduras. All patients with newly diagnosed breast cancer were invited to participate. We prospectively collected demographic, cancer, and treatment data through patient interviews and surveys. We also determined several time intervals including: onset of symptoms to initial provider visit (patient interval), initial provider visit to biopsy (diagnostic interval), and biopsy to first treatment (treatment interval). Patients also completed the Unger-Saldana Delay Survey to assess their perceptions of any delays in cancer care and reasons for these delays. Results: We enrolled 95 patients with an average age of 54 years. 73% of patients reported an income of < 1 minimum wage (< 8,448 lempiras/month). 93% were housewives, and 35% were married. The majority of patients had an elementary school education or no education (61%). The most common first symptom was a breast lump (81%). The majority of patients had advanced stage disease (Stage III and IV: 64%). The mean patient interval was 185 days. The mean diagnostic interval was 153 days, and the mean treatment interval was 139 days. Most patients (61%) thought their symptoms were slightly serious or not serious at all, and 78% did not think their symptoms were due to cancer. Most patients (60%) thought they were able to see a physician immediately or soon after symptoms developed (63%). Patient stated reasons for not seeking care earlier included believing their symptoms would self-improve, being unsure which health service to go to, lack of money, and fear. Similarly, most patients (67%) thought the time between seeing their first provider and visiting the cancer hospital was immediate or soon but not immediately. Reasons for this delay included lack of information, lack of money, wait times to appointment or tests, incorrect initial diagnosis, and fear. Conclusion: In this prospective cohort study, nearly two-thirds of patients in Honduras were diagnosed with stage III/IV breast cancer. We found marked delays in patient, diagnostic, and treatment intervals, even though patients perceived their care to be immediate. Importantly, the diagnostic interval far exceeded 60 days, as recommended by the BHGI. This study provides initial insight into delays in breast cancer care in Honduras and provides an opportunity to target obstacles to early diagnosis and treatment and to improve breast cancer survival. Citation Format: Saranya Prathibha, Alejandra Molina, Jorge Siryi, Kristhel Gaitán, Mildred Raudales, Manuel Maldonado, Todd Tuttle, Suyapa Bejarano. Mujeres Avanzando a la Sobrevida (MAS: women going forward in survival): Breast Cancer Characteristics and Delays in Care in Honduras [abstract]. In: Proceedings of the 2023 San Antonio Breast Cancer Symposium; 2023 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2024;84(9 Suppl):Abstract nr PO3-10-11.

Evaluation methods of BDS-3 ground-segment defensive capability oriented to satellite navigation countermeasures

Owing to intentional interference and destructions during satellite navigation countermeasures, the security application of global navigation satellite systems (GNSS) faces immense challenges. To ensure the safe application of the GNSS in complex electromagnetic environment, the system-level defensive capability need be assessed, which can make for maintaining GNSS normal service during countering and further realizing the optimal decision. Therefore, this study used the ground control segment in the GNSS as the evaluation object, the bottom indices related to the criterion layers including service performance and station function as the key evaluation indices, and the technical requirement of each index under a secure situation as the standard, to propose the evaluation system including index system and evaluation methods for the ground-segment defensive capability. As BeiDou navigation satellite system III (BDS-3) is a global navigation satellite system independently built and operated by China, it was taken as a case for method verification. Then, BDS-3 two-way observation data between the satellite and the ground and between stations, which was collected from Beijing flight Control Center, from March 5 to 12 (2022) were selected during tests, and the results were compared with the existing standards contained in BDS open service performance standard to evaluate the system-level defensive capability. Evaluation Results of positioning accuracy and error correction ability for the BDS-3's ground stations determined through seven damage experiments with different interference strength show that: Corresponding horizontal and vertical positioning accuracy of stations under test did not exceed 1 m in the statistical period and their convergence time did not exceed the limit (30 min); thus, the ground segment of the BDS-3 has a good defensive capability. Compared to comprehensive evaluation results of the BDS-3, based on the theoretical threshold (the ground-segment threshold ≤48.40 % and the space-segment threshold ≤51.60 %), we know that its ground-segment defense (14.06 %) was worse than GPS ground-segment defense (14.43 %), whereas the ground-segment defense of the BDS/GPS integrated system (15.29 %) was best and its capability evaluation grade was strong. They indicate system's future improvements should focus more on enhancing the development scale and service efficiency of the BDS-3's ground stations in the Western Hemisphere, and reasonably promote system compatibility and interoperability while considering facility cost and operating efficiency.

Descriptions of Four New Western Hemisphere Palm Bugs (Heteroptera: Thaumastocoridae: Xylastodorinae): A New Species of Xylastodoris from Haiti and Two Remarkable New Genera, One with Two New Species from Ecuador, and One with A New Species from Peru

Four new Western Hemisphere xylastodorine palm bugs (Thaumastocoridae: Xylastodorinae) are recognized. Neolatebracoris new genus is described to accommodate Neolatebracoris erwini new species from Peru; Xylastodoris cornutus new species is described from specimens intercepted at Miami, Florida, from Haiti; and Xylastotylus new genus is described to accommodate Xylastotylus emarginatus new species (as the type species) and X. minutus new species from Ecuador. Dorsal and lateral habitus and available genital capsule images, diagnoses, and descriptions are provided for each new genus and species. Relationships and biogeography of the new taxa are discussed, and revised keys to the New World genera of the subfamily and the species of Xylastodoris and Xylastotylus are provided.

American Trypanomiasis and Chagas Disease Sexual Transmission to Naïve Mates: Prevention And Control

Chagas disease is the most lethal endemic condition in the Western Hemisphere. Its high morbidity and mortality make the disease a major public health problem in Latin America. At the public hospitals' autopsy rooms, Chagas cardiomyopathy is a leading cause of people’s death, usually at 45 ± 10 years of age. Over the last decades, the disease epidemiologic profiles changed drastically with migration to the five Continents. The immigration of people from Latin America to the Northern Hemisphere bears health concerns, notably, the sexual transmission of Trypanosoma cruzi agent of Chagas disease from males and females to naïve mates, and its vertical transference to progeny. The family-based Chagas disease introduces substantial changes in concepts of disease prevention and control. The treatment of Chagas disease with nitro derivatives is unsatisfactory. In the absence of a drug to eradicate the T. cruzi infection, its control requires a robust program of education, information, and communication for health. Its prevention can be achieved through social activists participating in public and private organizations at schools, social clubs, churches, and people’s organizations for health and education.

Solar Energetic Particle and the Heliospheric Current Sheet

The effect of the heliospheric current sheet (HCS) on the propagation of solar energetic particles (SEPs) remains poorly known. In this study we address this question by surveying energetic (∼2.0–9.6 MeV nucleon–1) helium data acquired by the energetic particle acceleration, composition, and transport (EPACT) sensor on board the Wind spacecraft. A superposed epoch analysis of 319 HCS crossings made by Wind reveals a sharp drop in the SEP fluxes at the HCS for the low-energy channels and little change across the HCS for the high-energy channels. To help understand the statistical result, we studied a total of 15 SEP flux dropout (a decrease of ∼50% or more) events that coincided with the crossing of the HCS. One of the common features of these SEP events is that they were initiated in the western hemisphere but far away from the longitude of HCS crossings, suggesting that the source of SEPs was well connected initially but was cut off later after Wind moved to the opposite hemisphere (e.g., HCS crossing). Further analysis of the events suggests that the percentage of flux dropouts decreases with increasing energy. It is suggested that a strong scattering of MeV helium may have occurred as the particle gyroradius is comparable to the thickness of the current sheet. This study clearly provides solid evidence for the HCS as a barrier to suppressing SEP flux of MeV energies from the onset hemisphere to the other.

Identification and Genetic Diversity of Spodoptera frugiperda J. E. Smith (Lepidoptera: Noctuidae) in Egypt

Fall armyworm, Spodoptera frugiperda, is a serious agricultural pest native to tropical and subtropical regions of the Western Hemisphere and has invaded Africa and further spread into most countries of Asia within two years. In Egypt, researchers have conducted thorough investigations into the behavior of the fall armyworm and various methods to manage its impact. This study aims to further our understanding of the genetic diversity of fall armyworm populations in Egypt. By collecting specimens from five provinces across the country, we sought to analyze their genetic makeup. Through examination of partial sequences of the mitochondrial cytochrome oxidase subunit I (COI), we identified three distinct haplotypes. Phylogenetic analysis suggests that the primary sources of Spodoptera frugiperda in Egypt likely stem from both Asian and African origins. Employing the PCR-RFLP technique on the complete COI sequence, we were able to discern genotype patterns within the fall armyworm population. Our findings indicate the presence of two distinct strains—the Corn and Rice strains—within Egypt. This research contributes essential insights into the genetic diversity of insects in Egypt, providing valuable knowledge that can inform more effective strategies for managing this agricultural pest.

Locating the 1948 Economic Agreement of Bogotá: The Rise and Fall of Latin America’s International Economic Law Project

Abstract This article claims that Latin America developed a competing International Economic Law project in the 1940s. These ideas and practices served the region to imagine its economic development process. Through the work of economists and lawyers – especially international lawyers – Latin America envisioned a future of industrialization and designed a strategy to make it happen. In the 1940s, many Latin Americans were enthusiastic about the prospects of industrialization; however, the consensus was that this objective required regional cooperation to reshape international trade and foreign investment laws among themselves and, especially, vis-à-vis the United States. This article explores this regional momentum focusing on the 1948 Economic Agreement of Bogotá, one of the most important international economic law-making efforts in the Western Hemisphere. In Bogotá, many Latin American governments insisted that states, not markets or foreign investors, should plan the region’s economic future. The United States and the US business elite disagreed.

Comparative proteomic analysis of the hemolymph and salivary glands of Rhodnius prolixus and R. colombiensis reveals candidates associated with differential lytic activity against Trypanosoma cruzi Dm28c and T. cruzi Y.

Immune response of triatomines plays an important role in the success or failure of transmission of T. cruzi. Studies on parasite-vector interaction have shown the presence of trypanolytic factors and have been observed to be differentially expressed among triatomines, which affects the transmission of some T. cruzi strains or DTUs (Discrete Typing Units). Trypanolytic factors were detected in the hemolymph and saliva of R. prolixus against epimastigotes and trypomastigotes of the Y strain (T. cruzi II). To identify the components of the immune response that could be involved in this lytic activity, a comparative proteomic analysis was carried out, detecting 120 proteins in the hemolymph of R. prolixus and 107 in R. colombiensis. In salivary glands, 1103 proteins were detected in R. prolixus and 853 in R. colombiensis. A higher relative abundance of lysozyme, prolixin, nitrophorins, and serpin as immune response proteins was detected in the hemolymph of R. prolixus. Among the R. prolixus salivary proteins, a higher relative abundance of nitrophorins, lipocalins, and triabins was detected. The higher relative abundance of these immune factors in R. prolixus supports their participation in the lytic activity on Y strain (T. cruzi II), but not on Dm28c (T. cruzi I), which is resistant to lysis by hemolymph and salivary proteins of R. prolixus due to mechanisms of evading oxidative stress caused by immune factors. The lysis resistance observed in the Dm28c strain would be occurring at the DTU I level. T. cruzi I is the DTU with the greatest geographic distribution, from the south of the United States to central Chile and Argentina, a distribution that could be related to resistance to oxidative stress from vectors. Likewise, we can say that lysis against strain Y could occur at the level of DTU II and could be a determinant of the vector inability of these species to transmit T. cruzi II. Future proteomic and transcriptomic studies on vectors and the interactions of the intestinal microbiota with parasites will help to confirm the determinants of successful or failed vector transmission of T. cruzi DTUs in different parts of the Western Hemisphere.

The SRG/eROSITA all-sky survey

Context. The first eROSITA all-sky survey (eRASS1) performed on board the Spectrum-Roentgen-Gamma mission (SRG) provides more than 900 000 X-ray sources in the 0.2–2.3 keV band located in the western hemisphere. Aims. We present identifications of the eRASS1 sources obtained using our HamStar method, which was designed for the identification of coronal X-ray sources. Methods. HamStar is a Bayesian framework that estimates coronal probabilities for each eRASS1 source based on a cross-match with optical counterparts from Gaia DR3. It considers geometric properties, such as angular separation and positional uncertainty, as well the additional properties of fractional X-ray flux, color, and distance. Results. We identify 138 800 coronal eRASS1 sources and estimate a completeness and reliability of about 91.5% for this sample, which we confirmed with Chandra detections. This is the largest available sample of coronal X-ray emitters and we find nearly five times as many coronal sources as in the ROSAT all-sky survey. The coronal eRASS1 sources are made up of all spectral types and the onset of convection and the saturation limit are clearly visible. As opposed to previous samples, rare source types are also well populated. About 10% of the coronal eRASS1 sources have a correlated secondary counterpart, which is a wide binary companion or belongs to the same stellar cluster. We also identify 6700 known unresolved binaries, and an excess of fast binary periods below 10 d. Furthermore, the binary sequence is clearly visible in a color–magnitude diagram. When combining the coronal eRASS1 sources with rotation modulations from Gaia DR3, we find 3700 X-ray sources with known rotation periods, which is the largest sample of this kind. We fitted the rotation–activity relation and convection turnover times for our flux-limited sample. We do not detect the low-amplitude fast rotators discovered in the Gaia DR3 sample in X-rays.

Historical Review of Sugarcane Streak Mosaic Virus that Has Recently Emerged in Africa.

Sugarcane streak mosaic virus (SCSMV), now assigned to the genus Poacevirus of the family Potyviridae, was reported for the first time in 1932 in Louisiana and was believed to be strain F of sugarcane mosaic virus (SCMV) for more than six decades. SCMV-F was renamed SCSMV in 1998 after partial sequencing of its genome and phylogenetic investigations. Following the development of specific molecular diagnostic methods in the 2000s, SCSMV was recurrently found in sugarcane exhibiting streak mosaic symptoms in numerous Asian countries but not in the Western hemisphere or in Africa. In this review, we give an overview of the current knowledge on this disease and the progression in research on SCSMV. This includes symptoms, geographical distribution and incidence, diagnosis and genetic diversity of the virus, epidemiology, and control. Finally, we highlight future challenges, as sugarcane streak mosaic has recently been found in Africa, where this disease represents a new threat to sugarcane production.

Multiethnic Slavery and the African Diaspora in Macau: The Search for the Geographic Limits of Vast Early America

Abstract: The geographic limits of early American history are continuously being debated. Recently, this has culminated in the popular adoption of the expression "vast early America," which looks beyond the previously dominant Atlantic paradigm to embrace hemispheric perspectives while underlining the need to delve more into continental Africa, the Mediterranean, Eurasia, and the Pacific and Indian Ocean worlds. But what are the limits of this widening historical panorama in the case of the history of slavery? A hitherto-unstudied set of mid-eighteenth-century baptismal records from the Portuguese enclave of Macau, which noted the birth, ethnicity, and parentage of dozens of African and other enslaved people, offers evidence that the transatlantic slave trade was part of a larger trade in people of African descent (and others) that was geographically uneven and regionally segmented but global in extent, reaching as far as China. Placing this unique new dataset within the context of other contemporary Portuguese- and Chinese-language sources reveals that the presence of "Black slaves" (黑 奴, heinu ) in this port city was shaped by many of the same imperial and missionary projects as in the Atlantic, as well as racialized in ways highly reminiscent of the Western Hemisphere by both European and Chinese observers. The increasingly racialized slave trade of vast early America was thus horrifyingly "vast."

Hemispheric-Level Experience and Education Enables Solutions to Complex International Problems

Whether man-made or natural, complex problems facing the countries of the Western Hemisphere are challenging. They transcend national boundaries and affect countries differently. Bureaucracy appears to exacerbate them. Moreover, government-developed solutions are often ineffective and require a resource commitment level that burdens the taxpayer. Because a solution optimized for one country is not often as functional in another, effective solutions for complex international problems require the coordinated and synchronized efforts of all of the countries impacted by the problem. International problems require international solutions, and individuals with a hemispheric perspective to problem-solving are better able to develop those solutions. Service with, and education from, a hemispheric-level organization contributes to the cognitive and experiential development of the kinds of individuals who can then create solutions to complex international problems.

Response to geomagnetic storm on 23–24 March 2023 long-lasting longitudinal variations of the global ionospheric TEC

This study examines the global behavior of the ionospheric TEC anomalies, i.e. their structures and temporal variability, during the initial, main and recovery phase of the geomagnetic storm occurring on 23–24 March 2023. For this purpose the global vertical TEC maps, generated by the NASA JPL IGS Ionosphere center, have been used and the geomagnetically forced anomalies have been presented in 2D (longitude-modip latitude) and polar maps. The main peculiar features of the TEC response could be summarized as: (i) the TOI-like event observed at the SH midnight hours during the main storm phase, and (ii) a clear longitude asymmetry between the TEC response at low and middle latitudes of the western and eastern hemispheres was seen; while the long-lasting positive response was evident for a full day in the western hemisphere the negative response or almost the lack of response was a characteristic of the eastern part. The study presented possible explanations of the above mentioned basic type of TEC anomalies by using the GUVY [O/N2] ratio maps and geomagnetic data from eight magnetometric stations situated at low latitudes for the separation of the effect generated by the DDEF. An attempt was made the observed TEC response during different storm phases to be reproduced. The presented reconstructions described in almost perfect way the real TEC responses and the RMSE assessments provided clear evidence for this evaluation.

The Saavedra Lamas Peace: How a Norm Complex Evolved and Crystallized to Eliminate War in the Americas

Abstracts After the Napoleonic Wars interstate war regularly occurred throughout the Western Hemisphere—until in matter of decades it disappeared. After the 1930s even low-level militarized interstate conflict became less frequent, shorter, and less severe over time. What explains the change in this specific region and historical jucture? We argue that leaders in the Americas identified territorial disputes and foreign intervention as interrelated problems that frequently caused the interstate war. In response, they developed a unique regional norm-complex that bundled together the norms of territorial integrity and non-intervention with the principle of peaceful conflict resolution. This norm complex emerged via Latin American entrepreneurship shortly after independence, cascaded with Pan-Americanism, and crystallized around the signature of the Saavedra Lamas Treaty in the early 1930s. We explain how, why, and when norm complexes develop. We then investigate the evolution and effects of the Latin American norm complex via statistics and within-case counterfactuals. We conclude that interstate war disappeared from the Americas with the acceptance and codification of this norm-complex.

GOES-R land surface products at Western Hemisphere eddy covariance tower locations

The terrestrial carbon cycle varies dynamically on hourly to weekly scales, making it difficult to observe. Geostationary (“weather”) satellites like the Geostationary Environmental Operational Satellite - R Series (GOES-R) deliver near-hemispheric imagery at a ten-minute cadence. The Advanced Baseline Imager (ABI) aboard GOES-R measures visible and near-infrared spectral bands that can be used to estimate land surface properties and carbon dioxide flux. However, GOES-R data are designed for real-time dissemination and are difficult to link with eddy covariance time series of land-atmosphere carbon dioxide exchange. We compiled three-year time series of GOES-R land surface attributes including visible and near-infrared reflectances, land surface temperature (LST), and downwelling shortwave radiation (DSR) at 314 ABI fixed grid pixels containing eddy covariance towers. We demonstrate how to best combine satellite and in-situ datasets and show how ABI attributes useful for ecosystem monitoring vary across space and time. By connecting observation networks that infer rapid changes to the carbon cycle, we can gain a richer understanding of the processes that control it.

Militarism and Militarization in Latin America: Introduction to the Special Issue

This Special Issue explores Latin America’s recent wave of militarism across countries, the militarization of the rule of law, and its consequences on everyday life. It draws on the region’s recent history of giving militarized responses to seemingly intractable social, political, and economical problems. We argue that the presence of military values, beliefs, and mentalities have permeated processes in which nations absorb and aspire to military practices, modes of organization, and martial discourses that require greater scholarly attention. The articles address a series of issues including various forms of militarism and the militarization of family, culture and education, diplomacy, policing, and public security in urban and rural settings. The contributions engage systematically with the roots of militarism and give evidence of militarization at the individual, national, and international levels, including a variety of case studies from across the Western Hemisphere.

Catastrophic storms, forest disturbance, and the natural history of Swainson's warbler.

The core breeding range of Swainson's warbler (Limnothlypis swainsonii) overlaps a zone of exceptionally high tornado frequency in southeastern North America. The importance of tornadoes in creating breeding habitat for this globally rare warbler and other disturbance-dependent species has been largely overlooked. This paper estimates tornado frequency (1950-2021) and forest disturbance in the 240 counties and parishes in which breeding was documented from 1988 to 2014. The frequency of destructive tornadoes (EF1-EF5) varied 6-fold across the breeding range with a peak in the Gulf Coast states. Counties from east Texas to Alabama experienced the lowest median return interval of 5.4 years per 1000 km2, resulting in approximately 2477 ha of forest damage per 1000 km2 per century, based on current forestland cover. Tornadoes were significantly less frequent north and east of the core breeding range, with return intervals increasing to 9.1 years per 1000 km2 for breeding counties on the Atlantic coastal plain, 10.2 years per 1000 km2 in the Ozark Mountains, and 32.3 years per 1000 km2 in the Appalachian Mountains. Breeding counties within 150 km of the coastline from east Texas to North Carolina are also subjected to the highest frequency of hurricanes in the Western Hemisphere. Hurricanes often cause massive forest damage but archived meteorological and forestry data are insufficient to estimate the aggregate extent of forest disturbance in breeding counties. Nevertheless, the combined impact of tornadoes and hurricanes in the pre-Anthropogenic era was likely sufficient to produce a dynamic mosaic of early-successional forest crucial for the breeding ecology of Swainson's warbler. To ensure the long-term survival of this rare warbler, it is advisable to develop habitat management plans that incorporate remote sensing data on early-successional forest generated by catastrophic storms as well as anthropogenic activities.

Using OSSEs to Evaluate GXS Impact in the Context of International Coordination

Abstract The Geostationary Extended Observations (GeoXO) program plans to include a hyperspectral infrared (IR) sounder on its central satellite, expected to launch in the mid-2030s. As part of the follow-on to the GOES program, the NOAA/NASA GeoXO Sounder (GXS) instrument will join several international counterparts in a geostationary orbit. In preparation, the NASA Global Modeling and Assimilation Office (GMAO) assessed the potential effectiveness of GXS both as a single GEO IR sounder and as part of a global ring that includes international partners. Using a global observing system simulation experiment (OSSE) framework, GXS was assessed from a numerical weather prediction (NWP) perspective. Evaluation of the ability of GXS, both alone and as part of a global ring of GEO sounders, to improve weather prediction of thermodynamic variables was performed globally and regionally. GXS dominated regional analysis and forecast improvements and contributed significantly to global increases in forecast skill relative to a Control. However, more sustained global improvements, on the order of 4 days, relied on international partnerships. Additionally, GXS showed the capability to improve hurricane forecast track errors on the time scales necessary for evacuation warnings. The FSOI metric over CONUS showed that the GXS observations provided the largest radiance impact on the moist energy error norm reduction. The high-temporal-resolution atmospheric profile information over much of the Western Hemisphere from GXS provides an opportunity to improve the representation of weather systems and their forecasts. Significance Statement NOAA and NASA are currently planning the GeoXO mission as a follow-on to the GOES program. As part of this process, NASA’s Global Modeling and Assimilation Office has performed several experiments using an observing system simulation experiment (OSSE) framework to assess the potential impact of the GeoXO Sounder (GXS) on numerical weather prediction within the context of international partners launching similar instruments. As part of this assessment, it was found that assimilation of GXS data has the ability to improve both the model analyzed weather and forecasts of the weather, specifically over the domain that GXS observes. Global improvements relied more heavily on a solution consisting of multiple instruments to form a global ring.

Resisting White Nostalgia: Sikh history in Abbotsford

ABSTRACT This paper uses the Sikh Heritage Museum, a National Historic Site Gur Sikh Temple, the oldest still standing gurdwara in the western hemisphere, in Abbotsford, BC, as a living site of Sikh story telling. The author shares her journey of transformation over the past decade, based on stories and archives that have emerged reminding us that histories of racism, including that of the ku klux klan continue to be relegated to the margins in the name of white nostalgia. Sikh story telling then, through truth and radicalism, is a reclaiming of histories that are nuanced, and can move communities forward.