Abstract
We present an Arctic aerosol optical depth (AOD) climatology and trend analysis for 2003–2019 spring and summertime periods derived from a combination of multi-agency aerosol reanalyses, remote sensing retrievals, and ground observations. This includes the U.S. Navy Aerosol Analysis and Prediction System ReAnalysis version 1 (NAAPS-RA v1), the NASA Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2), and the Copernicus Atmosphere Monitoring Service ReAnalysis (CAMSRA). Space-borne remote sensing retrievals of AOD are considered from the Moderate Resolution Imaging Spectroradiometer (MODIS), the Multi-angle Imaging SpectroRadiometer (MISR), and Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP). Ground-based data include sun photometer data from Aerosol Robotic Network (AERONET) sites and oceanic Maritime Aerosol Network (MAN) measurements. Aerosol reanalysis AODs and space-borne retrievals show consistent climatological spatial patterns and trends for both spring and summer seasons over the sub-Arctic (60–70° N). Consistent signs in the AOD trend are also found for the high Arctic (north of 70° N) from reanalyses. The aerosol reanalyses yield more consistent AOD results than climate models, verify well with AERONET, and corroborate complementary climatological and trend analysis. Speciated AODs are more variable than total AOD among the three reanalyses, and a little more so for March–May (MAM) than for June–August (JJA). Black Carbon (BC) AOD in the Arctic comes predominantly from biomass burning sources in both MAM and JJA, and biomass burning overwhelms anthropogenic sources in JJA for the study period. AOD exhibits a negative trend in the Arctic in MAM, and a positive trend in JJA during 2003–2019, due to an overall decrease in sulfate/anthropogenic pollutions, and a significant increase in biomass burning smoke in JJA. Interannual Arctic AOD variability is significantly large, driven by fine-mode, and specifically, biomass burning (BB) smoke, though more so in JJA than in MAM. Extreme AOD events during spring and summer in the Arctic, defined as AOD greater than the 95th percentile value, are mainly attributed to BB smoke transport events. Extreme AOD cases tend to occur later in the season (i.e., July and August, in the latter decade rather than spreading over April–August in the early decade during 2003–2019) corresponding to a shift to a later time in extreme boreal BB activities.
Highlights
55 The Arctic is warming faster than the overall global climate, a phenomenon widely56 known as Arctic amplification (Serreze and Francis 2006; Serreze and Barry 2011)
We present the seasonal cycle, interannual variability and trends of total and speciated aerosol optical depth (AOD). Statistics of extreme AOD events in the Arctic are provided in the end. 580 5.1 Spring and Summertime AOD Climatology for the Arctic 581 5.1.1 Space-based remote sensing AOD climatology
As no data coverage (Fig. 3) in the high Arctic and Greenland, and over large regions of North America and Siberia in both March-April-May (MAM) and June-July-August (JJA) in the AOD climatology maps based on Moderate Resolution Imaging Spectroradiometer (MODIS), Multi-angle Imaging SpectroRadiometer (MISR), and Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP)
Summary
55 The Arctic is warming faster than the overall global climate, a phenomenon widely56 known as Arctic amplification (Serreze and Francis 2006; Serreze and Barry 2011). 57 has led to rapid changes in regional sea ice properties. September sea ice coverage is 58 shrinking at an unprecedented rate (Comiso 2012; Meier et al, 2014). Mechanisms contributing to sea ice changes include increased. 61 anthropogenic greenhouse gases (Notz and Stroeve 2016; Dai et al, 2019), sea ice-. albedo feedback (Perovich and Polashenski 2012), increased warm and moist air intrusion into the Arctic (Boisvert et al 2016; Woods et al, 2016; Graham et al 2017), radiative feedbacks associated with cloudiness and humidity (Kapsch et al 2013; Morrison et al 2018), and increased ocean heat transport (Nummelin et al, 2017; Taylor et al 2018). One of the least understood factors of Arctic change is the 67 impact of aerosols on sea ice albedo and concentration (IPCC 2013)
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