Significant Decrease in Wet Deposition of Anthropogenic Chloride Across the Eastern United States, 1998–2018

Significant Decrease in Wet Deposition of Anthropogenic Chloride Across the Eastern United States, 1998–2018
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1998 年至 2018 年美国东部人为氯化物湿沉积显着减少

DOI:
10.1029/2020gl090195
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发表时间:
2020
影响因子:
5.2
通讯作者:
Thornton, Joel A.
Thornton, Joel A.
中科院分区:
地球科学1区
文献类型:
--
作者:
Haskins, Jessica D.;Jaeglé, Lyatt;Thornton, Joel A.

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利用国家大气沉积计划在美国125个站点收集的降水样本的沉积观测结果,我们发现,1998年至2018年间,整个美国东部地区非海盐氯化物(NSS Cl -)的平均湿沉积通量减少了83%。我们发现30%的位置从有多余的Cl -转变为被Cl -耗尽。我们将观测到的NSS Cl−沉降的减少归因于自1998年以来美国人为HCl排放减少了95%。我们认为,除去HCl作为nox和so2的共同利益的工业排放控制,除了从煤炭转向天然气和Cl -含量较低的煤炭外,还导致了整个美国东部NSS Cl -沉积的显著减少。我们的分析表明,过去美国上空对流层低层的活性无机氯负荷比现在要大。
Using deposition observations from precipitation samples collected by the National Atmospheric Deposition Program at 125 sites across the United States, we show that the mean wet deposition flux of non‐sea‐salt chloride (NSS Cl−) has decreased by 83% throughout the eastern United States between 1998 and 2018. We find that 30% of the sites switch from having excess Cl−to being depleted in Cl−. We attribute the observed decreases in NSS Cl−deposition to a 95% decrease in U.S. anthropogenic HCl emissions since 1998. We propose that industry emission controls that remove HCl as a cobenefit of NOxand SO2have caused significant decreases in NSS Cl−deposition throughout the eastern United States, in addition to shifts from coal to natural gas and to coal with lower Cl−content. Our analysis implies that the lower tropospheric reactive inorganic chlorine burden was larger over the United States in the past than it is today.
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