Wet Atmospheric Deposition Of Nitrogen Research Articles

Nitrogen atmospheric deposition driven by seasonal processes in a Brazilian region with agricultural background.

Understanding the seasonal patterns and influencing factors of nitrogen atmospheric deposition is essential to evaluate human impacts on the air quality and nitrogen biogeochemical cycle. However, evaluation of the nitrogen deposition flux, especially in South America agricultural regions, has not been fully investigated. In this paper, we quantified the atmospheric wet deposition fluxes of total dissolved nitrogen (TDN), dissolved organic nitrogen (DON), and dissolved inorganic nitrogen (DIN), in a region with agricultural and livestock predominance in the Southern Minas Gerais region, Brazil, from May 2018 to April 2019. Deposition fluxes of nitrogen species in the wet season (October-March) were on average 4.8-fold higher than those in the dry season, which revealed significant seasonal variations driven largely by the seasonality of rainfall and agricultural operations. We also found high NO3-/NH4+ ratios (average = 8.25), with higher values in dry season (NO3-/NH4+ = 12.8) in comparison with wet season (NO3-/NH4+ = 4.48), which revealed a higher relative contribution of NOx emissions from traffic sources in dry season. We also estimated the influence of atmospheric deposition of inorganic nitrogen (N-DIN) on environmental ecosystems, being 2.01 kgNha-1year-1 with potential risk of acidification and eutrophication of 30%. Therefore, attention should be paid to the role of wet atmospheric deposition of nitrogen as a source of nitrogen environmental pollution in agricultural regions.

Influence of Atmospheric Phosphorus and Nitrogen Sedimentation on Water Quality in the Middle Route Project of the South-to-North Water Diversion in Henan Province.

In order to understand the potential effects of atmospheric nitrogen and phosphorus deposition on the water quality of the Middle Route Project of the South-to-North Water Diversion Project, samples of dry and wet deposition of atmospheric nitrogen and phosphorus, meteorological factors, and water quality factors were analyzed out to investigate in the Middle Route Project of the South-to-North Water Diversion in Henan Province from October 2018 to October 2020. The variation characteristics of atmospheric nitrogen and phosphorus deposition with time in the Henan section of the main canal are revealed, and the influence of atmospheric dry and wet deposition on the water quality of the middle line is discussed. It was found that the total nitrogen (TN) sedimentation flux has obvious seasonal variation, which was consistent with the variation trend of rainfall, and increased with the increase of rainfall. Nitrogen and phosphorus deposition was significantly correlated with water factors. The effects of meteorological factors and nitrogen and phosphorus deposition on water quality variation reached 18%. The contribution rate and ecological impact of atmospheric nitrogen and phosphorus deposition on water pollution of main channels will be increasing, which needs to be paid enough attention to.

Wet atmospheric deposition of nitrogen and phosphorus and estimation of their contributions to the lake in typical subtropical reservoir basins

Wet atmospheric deposition of nitrogen and phosphorus and estimation of their contributions to the lake in typical subtropical reservoir basins

Dry and Wet Deposition of Atmospheric Nitrogen in Small Catchments

Atmospheric nitrogen deposition is one of the important pathways for the transmission of terrestrial pollutants and nutrients to aquatic ecosystems. A considerable amount of nitrogen substances is delivered into the surface water environment via atmospheric deposition in the catchments, which are greatly affected by human activities, and have serious negative effects on the nutrient level and aquatic habitat environment. The Shixia Catchment north of the Miyun Reservoir was selected as study area. Samples of particulate dry and wet deposition were collected and tested. Subsequently, the variation of the atmospheric nitrogen deposition flux and factors impacting it were determined; ultimately, the contribution of atmospheric nitrogen deposition to the nitrogen budget of the catchment was estimated. The major results are as follows:① The total nitrogen deposition flux of particulate dry and wet deposition is characterized by a significant temporary variation. Regarding the total nitrogen, the ammonia nitrogen and wet deposition flux are the highest in summer and dissolved organic nitrogen is the highest in spring. However, the flux of nitrate nitrogen shows no notable seasonal fluctuation. The general trend of the particulate dry deposition flux is supreme in winter, followed by that in autumn and spring. In detail, the total nitrogen and ammonia nitrogen deposition are the largest in winter, while the seasonal variance of nitrate nitrogen appears to be less apparent. The dry deposition flux of dissolved organic nitrogen is the greatest in autumn. ② The total flux of nitrogen deposition is 43.14 kg·hm-2 in the Shixia Catchment; the wet and dry deposition flux account for 39.85% and 60.15%, respectively. ③ Rainfall and wind speed conditions are important factors impacting the atmospheric nitrogen deposition. The rainfall and rainfall intensity are negatively correlated with the wet nitrogen deposition concentration. With respect to the particulate dry deposition, the average wind speed during the monitoring period is important to ammonia nitrogen. ④ The contribution of atmospheric nitrogen deposition to the total nitrogen input in this catchment is approximately 15.09%, second only to livestock and poultry farming and rural life. The results of this study provide information that is useful for the nitrogen management in the catchment.

Wet deposition of atmospheric nitrogen contributes to nitrogen loading in the surface waters of Lake Tanganyika, East Africa: a case study of the Kigoma region.

Lake Tanganyika, an African Great Lake, is a complex tropical ecosystem that has been subjected to extreme climate-related changes in the last century, including seasonal changes in temperature and rainfall, decreased overall annual rainfall, and greater frequency of rainstorms. Atmospheric nitrogen (N) is an important component of the lake's N loading, but how long-term and seasonal changes in precipitation affect this loading still needs clarification. This study aimed to improve our understanding of the seasonal features of N deposition in the lake, by monitoring atmospheric N deposition concentrations and fluxes from March 2013 to February 2014. There was a significant temporal variation in wet N depositions in the study area. The distribution of the annual rainfall into major (March-May 299.8 mm) and minor (October-December 343.2 mm) rainy seasons translated into 20 and 30% of N deposition. In September and January-February, there was 10 and 12% precipitation, representing 43 and 7% of N deposition in the lake. Nitrogen deposition was highest in September due to farmlands' burning during the dry season (June-August), leading to N accumulation in the atmosphere. In conclusion, the pattern of N deposition appears to be driven by the unique climatic characteristics of the lake basin and to be closely associated with local anthropogenic activities.

陕西省不同生态区大气氮素干湿沉降的时空变异

PDF HTML阅读 XML下载 导出引用 引用提醒 陕西省不同生态区大气氮素干湿沉降的时空变异 DOI: 10.5846/stxb201211011517 作者: 作者单位: 西北农林科技大学资源环境学院,西北农林科技大学资源环境学院,陕西省长安区气象局,中国农业大学,陕西省气象局,西北农林科技大学资源环境学院 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金资助项目（40675006） Spatial-temporal variability of dry and wet deposition of atmospheric nitrogen in different ecological regions of Shaanxi Author: Affiliation: College of Resources and Environmental Sciences,Northwest A F University,Yangling Shaanxi,College of Resources and Environmental Sciences,Northwest A F University,Yangling Shaanxi,Weather Bureau of Changan District,Xi’an,China Agricultural University,Weather Bureau of Shaanxi Province,Xi’an,College of Resources and Environmental Sciences,Northwest A F University,Yangling Shaanxi Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:为研究陕西省不同生态区大气氮素干湿沉降的时空变化规律，于2009年11月至2010年10月对4个生态区5个监测点的干湿沉降输入量进行为期1a的观测。结果表明：监测期内，榆林、洛川、西安、杨凌和安康地区总N沉降量分别为4.7、11.9、25.8、31.9和19.2 kg/hm2，其中N湿沉降量分别为2.9、10.4、24.8、27.7和16.3 kg/hm2，占总沉降的62%-96%，N干沉降量分别为1.8、1.5、1.0、4.1和2.9 kg/hm2，占4%-38%，且湿沉降与降雨量之间呈正相关关系，干沉降与之相反；各地区NH4+-N沉降量分别为2.0、6.4、17.0、17.2和11.9 kg/hm2，占总沉降的44%-66%，NO3--N沉降量分别为2.6、5.5、8.8、14.7和7.3 kg/hm2，占34%-56%，除榆林地区外，其他地区以NH4+-N沉降为主。 Abstract:The objective of this experiment was to study the spatial-temporal variability of dry and wet deposition of atmospheric nitrogen in different ecological regions of Shaanxi Province. Measurements were made at five monitoring sites in four different ecological regions from November 2009 to October 2010. The amounts of total inorganic nitrogen (TIN) deposition were 4.7 kg/hm2 at Yulin, 11.9 kg/hm2 at Luochuan, 25.8 kg/hm2 at Xi'an, 31.9 kg/hm2 at Yangling, and 19.2 kg/hm2 at Ankang. Wet deposition accounted for 62 to 96% of the TIN deposition, ranging from 2.9 kg/hm2 at Yulin, 10.4 kg/hm2 at Luochuan, 24.8 kg/hm2 at Xi'an, 27.7 kg/hm2 at Yangling, and 16.3 kg/hm2 at Ankang. Dry deposition accounted for 4 to 38% of the TIN deposition, ranging from 1.8 kg/hm2 at Yulin, 1.5 kg/hm2 at Luochuan, 1.0 kg/hm2 at Xi'an, 4.1 kg/hm2 at Yangling, and 2.9 kg/hm2 at Ankang. Wet deposition and rainfall were positively correlated, whereas dry deposition and rainfall were negatively correlated. Ammonium nitrogen (NH4+-N) deposition amounts were 2.0 kg/hm2 at Yulin, 6.4 kg/hm2 at Luochuan, 17.0 kg/hm2 at Xi'an, 17.2 kg/hm2 at Yangling, and 11.0 kg/hm2 at Ankang. These amounts accounted for 44 to 66% of the TIN deposition. Nitrate nitrogen (NO3--N) amounts were 2.6 kg/hm2 at Yulin, 5.5 kg/hm2 at Luochuan, 8.8 kg/hm2 at Xi'an, 14.7 kg/hm2 at Yangling, and 7.3 kg/hm2 at Ankang. These amounts made up 34 to 56% of the TIN deposition. Nitrogen deposition is mainly in the form of NH4+-N in all regions except Yulin. 参考文献 相似文献 引证文献

Wet and dry atmospheric depositions of inorganic nitrogen during plant growing season in the coastal zone of Yellow River Delta.

The ecological problems caused by dry and wet deposition of atmospheric nitrogen have been widespread concern in the world. In this study, wet and dry atmospheric depositions were monitored in plant growing season in the coastal zone of the Yellow River Delta (YRD) using automatic sampling equipment. The results showed that SO4 2− and Na+ were the predominant anion and cation, respectively, in both wet and dry atmospheric depositions. The total atmospheric nitrogen deposition was ~2264.24 mg m−2, in which dry atmospheric nitrogen deposition was about 32.02%. The highest values of dry and wet atmospheric nitrogen deposition appeared in May and August, respectively. In the studied area, NO3 −–N was the main nitrogen form in dry deposition, while the predominant nitrogen in wet atmospheric deposition was NH4 +–N with ~56.51% of total wet atmospheric nitrogen deposition. The average monthly attribution rate of atmospheric deposition of NO3 −–N and NH4 +–N was ~31.38% and ~20.50% for the contents of NO3 −–N and NH4 +–N in 0–10 cm soil layer, respectively, suggested that the atmospheric nitrogen was one of main sources for soil nitrogen in coastal zone of the YRD.

Wet atmospheric deposition of nitrogen: 20 years measurement in Shenzhen City, China

We presented measurements of wet deposition of NH(4)(+)-N and NO(3)(-)-N from 1986 to 2006 in Shenzhen City, China. Over the past 20 years, NO(3)(-)-N concentration had significantly increased, but a reverse trend was found for NH(4)(+)-N. The main form of total inorganic nitrogen (TIN) was NH(4)(+)-N and the average NH(4)(+)-N/NO(3)(-)-N ratio was 1.57 in this area. The contribution of NO(3)(-)-N to TIN increased from 28-42% in the period of 1986-2000 to 50-63% during 2001-2006. The increased deposition flux of NO(3)(-)-N resulted in the increasing trend of TIN, although NH(4)(+)-N showed a decreasing trend over time. Average deposition flux of TIN during 1986-2006 was 13.24 kg/ha/year, with a minimum value of 6.03kg/ha/year in 1988 and a maximum value of 20.52 kg/ha/year in 1997. Wet deposition fluxes of N appeared to vary with season, 81% occurred in the warm season (from April to September). The wet deposition of TIN to the Shenzhen Reservoir reached 8,902 kg in 2006, which contributed 9.95% of the total nonpoint pollution to the reservoir and will be increased in the future.

Dry and wet atmospheric deposition of nitrogen and phosphorus in Singapore

Abstract Atmospheric nutrients have recently gained increased attention as significant additional sources of new nitrogen (N) and phosphorus (P) loading to aquatic ecosystems. The levels of nutrients (NO3−–N, NH4+–N, ON, DIP and OP) in aerosols and rainwater were measured and their respective deposition fluxes were estimated in the Marina catchment area, Singapore, from April 2007 to March 2008. During the study period, the mean atmospheric dry particulate fluxes (mg m−2 month−1) were 21.64 ± 13.56, 2.95 ± 1.73, 24.21 ± 9.59, 4.48 ± 1.74 and 7.19 ± 2.83 for NO3−–N, NH4+–N, ON, DIP and OP, respectively. In addition, the mean wet deposition fluxes (mg m−2 month−1) were 59.60 ± 45.29, 30.39 ± 12.99, 39.03 ± 20.70, 1.79 ± 1.03 and 2.46 ± 1.29 for NO3−–N, NH4+–N, ON, DIP and OP, respectively. Wet deposition made a larger contribution to total fluxes than dry deposition for N species especially NO3− and NH4+, but P species showed the opposite trend. Both TN and TP showed different seasonal variations with peak wet deposition fluxes in Dec 2007 and Jan 2008 as compared to dry deposition fluxes which peaked during the inter-monsoon (IM) period. Other than the local emissions, air mass backward trajectory analysis indicated that the atmospheric nutrient concentration may be affected by transboundary transport of nutrients from regional sources during different monsoon seasons. Statistical correlation analysis showed that the deposition fluxes were associated with meteorological factors. In addition, the N:P ratio in annual total (dry particulate + wet) atmospheric deposition flux in this study was 10.5, implying that the aquatic ecosystems in Singapore, fed principally by atmospheric nutrients, may tend toward N-limitation.

Wet deposition of atmospheric nitrogen and its eutrophication effect on Xihu Lake，Huizhou City

摘要: 根据2000～2004年广东省惠州市降水中氮浓度,采用单因子评估模式评价了大气氮湿沉降及其对惠州西湖水体富营养化的影响.结果表明,近5年惠州市湿沉降平均NO-3 -N含量为0.469 mg · L-1,NH 4 -N含量为0.391 mg · L-1,总无机氮(TIN)含量为0.861 mg · L-1,远大于富营养水体中氮浓度阀值(0.2 mg · L-1).湿沉降中氮含量呈逐年增加趋势,2004年湿沉降氮含量较2000年增加了近1倍.依据降水中氮浓度,2000～2004年湿沉降中总氮含量为Ⅲ～Ⅳ类水;而降水氮含量季节变化中,总氮为Ⅱ类～劣Ⅴ类水,Ⅴ和劣Ⅴ类水质开始频繁出现.湿沉降每年输入惠州市的TIN为16.26 kg · hm-2,湿沉降中氮浓度已超过水体富营养化阈值.因此,湿沉降输入氮对惠州西湖水生态环境,特别是水体富营养化的影响值得关注. 关键词: 大气湿沉降 / 氮 / NO-3-N / NH4-N / 总无机氮 / 城市湖泊 / 水体富营养化 / 气氮 / 湿沉降 / 惠州市 / 西湖 / 水体富营养化 / 影响 / Lake / effect / eutrophication / nitrogen / atmospheric / deposition / 值得关注 / 水生态环境 / 阈值 / 输入 / 水质 / 总氮含量 / 季节变化 / 趋势

Dry and wet atmospheric deposition of nitrogen, phosphorus and silicon in an agricultural region

We measured atmospheric nutrient deposition as wet deposition and dry deposition to dry and wet surfaces. Our analyses offer estimates of atmospheric transport of nitrogen (N), phosphorus (P) and silicon (Si) in an agricultural region. Annual dry and wet deposition (ha−1 year−1) was 0.3 kg of P, 7.7 kg of N, and 6.1 kg of Si; lower than or similar to values seen in other landscapes. N:P and Si:N imply that atmospheric deposition enhances P and Si limitation. Most P and soluble reactive P (SRP) deposition occurred as dryfall and most dry-deposited P was SRP so would be more readily assimilable by plant life than rainfall P. Dry deposition of N to wet surfaces was several times greater than to dry surfaces, suggesting that ammonia (NHx) gas absorbtion by water associated with wet surfaces is an important N transport mechanism. Deposition of all nutrients peaked when agricultural planting and fertilization were active; ratios of NHx:nitrate (NOx) hbox{reflected} the predominant use of NHx fertilizer. Wet deposition estimates were consistent over hundreds of km, but dry deposition estimates were influenced by animal confinements and construction. Precipitation wash-out of atmospheric nutrients was substantial but larger rain events yielded higher rates of wet deposition. Methodological results showed that local dust contaminated wet deposition more than dry; insects, bird droppings and leaves may have biased past deposition estimates; and estimating dry deposition to dry plastic buckets may underestimate annual deposition of N, especially NHx.

Spatiotemporal variability of wet atmospheric nitrogen deposition to the Neuse River Estuary, North Carolina.

Excessive nitrogen (N) loading to N-sensitive waters such as the Neuse River estuary (North Carolina) has been shown to promote changes in microbial and algal community composition and function (harmful algal blooms), hypoxia and anoxia, and fish kills. Previous studies have estimated that wet atmospheric deposition of nitrogen (WAD-N), as deposition of dissolved inorganic nitrogen (DIN: NO3-, NH3/NH4+) and dissolved organic nitrogen, may contribute at least 15% of the total externally supplied or "new" N flux to the coastal waters of North Carolina. In a 3-yr study from June 1996 to June 1999, we calculated the weekly wet deposition of inorganic and organic N at eleven sites on a northwest-southeast transect in the watershed. The annual mean total (wet DIN + wet organics) WAD-N flux for the Neuse River watershed was calculated to be 956 mg N/m2/yr (15026 Mg N/yr). Seasonally, the spring (March-May) and summer (June-August) months contain the highest total weekly N deposition; this pattern appears to be driven by N concentration in precipitation. There is also spatial variability in WAD-N deposition; in general, the upper portion of the watershed receives the lowest annual deposition and the middle portion of the watershed receives the highest deposition. Based on a range of watershed N retention and in-stream riverine processing values, we estimate that this flux contributes approximately 24% of the total "new" N flux to the estuary.