https://scholars.lib.ntu.edu.tw/handle/123456789/606296
標題: | Changes of precipitation acidity related to sulfur and nitrogen deposition in forests across three continents in north hemisphere over last two decades | 作者: | Chang C.-T CI-JIAN YANG Huang K.-H Huang J.-C JR-CHUAN HUANG |
關鍵字: | Ammonium;Atmospheric deposition;Calcium;Emission control;Nitrate;Sulfate;Acid rain;Ammonia;Calcium compounds;Forestry;Meteorological problems;Nitrogen oxides;Sulfur dioxide;Atmospheric depositions;Bulk precipitation;East Asia;Emissions control;Forest sites;Monitoring network;Nitrogen deposition;Precipitation chemistry;Sulphur deposition;Temporal change;Nitrates;ammonia;calcium;nitrate;nitrogen;nitrogen oxide;sulfate;sulfur;sulfur dioxide;acidity;atmospheric deposition;deposition;emission control;monitoring system;nitrogen oxides;Northern Hemisphere;precipitation (chemistry);precipitation assessment;temporal analysis;acid deposition;Acid Deposition Monitoring Network in East Asia;acid precipitation;air pollution control;Article;Asia;controlled study;environmental aspects and related phenomena;environmental monitoring;environmental policy;Europe;European Monitoring and Evaluation Program;forest;geographic names;National Atmospheric Deposition Program;nitrogen deposition;Northern America;pH;precipitation;Southeast Asia;sulfur deposition;air pollutant;Far East;North America;Air Pollutants;Environmental Monitoring;Forests;Nitrogen;Sulfur | 公開日期: | 2022 | 卷: | 806 | 來源出版物: | Science of the Total Environment | 摘要: | Through synthesizing bulk precipitation chemistry in forest sites (n = 128) from three monitoring networks, (NADP in Northern America, EMEP in Europe, and EANET in East Asia), this study quantifies the temporal changes of precipitation acidity and its dominant acidifying agents over the last two decades. Results show distinct declines of sulfate and nitrate depositions and increases of precipitation pH in northeast America and central and east Europe, but not in Asia during 1999 and 2018. The decreases of sulfate and nitrate depositions likely reflect the long-term effort of pollutant emission controls. The temporal pattern of sulfate (SO42?)/nitrate (NO3?) and ammonium nitrogen (NH4-N)/nitrate nitrogen (NO3-N) equivalent ratios indicate that acid rain in the NADP and EMEP have transitioned from sulfate-dominated to nitrate-dominated, and the DIN deposition has shifted from nitrate-dominated to ammonium-dominated in recent years, owing to reductions of sulfur dioxides (SO2) and nitrogen oxides (NOx) emissions. In contrast, sulfate still plays a dominant role on the acidity of precipitation than nitrate in Asia, and NH4-N deposition also has a significant contribution in N flux due to increasing trends of ammonia emissions in Southeast Asia. ? 2021 |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85115743439&doi=10.1016%2fj.scitotenv.2021.150552&partnerID=40&md5=62f85e0fcbfd26cfcbad5aae8c1748c7 https://scholars.lib.ntu.edu.tw/handle/123456789/606296 |
ISSN: | 00489697 | DOI: | 10.1016/j.scitotenv.2021.150552 |
顯示於: | 地理環境資源學系 |
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