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南北半球高纬度地区夏天大气MSA比率分布

【标题】南北半球高纬度地区夏天大气MSA比率分布

【Title】Latitudinal distributions of atmospheric MSA and MSA/nss‐SO42− ratios in summer over the high latitude regions of the Southern and Northern Hemispheres

【DOI】10.1029/2011JD016559

【作者】 陈立奇; 徐国杰; 杨绪林; 张远辉

【Author】 Chen Liji ; Xu Guojie ; Yang Xulin ; Zhang Yuanhui

【期刊】JOURNAL OF GEOPHYSICAL RESEARCH

【Journal】JOURNAL OF GEOPHYSICAL RESEARCH

【期刊年份】2012

【卷】117

【期】D10306

【关键词】

【Keywords】

【摘要】To characterize the spatial distributions of methane-sulfonic acid (MSA) as represented by measured aerosol methane sulfonate (MS) and its relationships with non-sea-salt (nss) sulfate (SO4 2) in the marine atmospheric boundary layer over high-latitude regions, bulk aerosol samples were collected during eight cruises during the Chinese National Antarctic and Arctic Research Expeditions from 1998 to 2008.The concentrations of MSA (an indicator of marine biogenic sulfur production), sulfate,sodium and chloride in samples were analyzed using ion chromatography. Increases in the aerosol MSA concentrations and MSA/nss-SO4 2 ratios were observed as functions of latitudes in the Pacific Ocean, more abruptly near high southern latitudes as compared to those in high northern latitudes. The MSA concentrations increased from 0.011 mg m-3 near the equator to 0.26 mg m-3 at 63°S, 23°W and from 0.0013 mg m-3 at northern midlatitudes to 0.19 mg m-3 at 58°N, 175°E. However, MSA decreased in the latitudes north of 58°N in the Pacific, where air temperature was lower. MSA/nss-SO4 2 ratios increased from 0.024 near the equator to 0.93 at 62°S, 4°E and from 0.0031 around northern midlatitudes to 0.39 at 68°N, 169°W. The MSA concentrations were more correlated with MSA/nss-SO4 2 (R2 = 0.43, n = 60) in Southern Hemisphere than Northern Hemisphere (R2 = 0.091, n = 40). No significant correlation was found between MSA/nss-SO4 2 and air temperature at high latitudes, indicating latitudinal temperature variations were not a main factor responsible for the MSA/nss-SO4 2 variation in those regions. Substantial increases in the concentrations of MSA in coastal Antarctica may indicate additional sources of biogenic S besides the emissions of dimethylsulfide from the sea.

【Abstract】To characterize the spatial distributions of methane-sulfonic acid (MSA) as represented by measured aerosol methane sulfonate (MS) and its relationships with non-sea-salt (nss) sulfate (SO4 2) in the marine atmospheric boundary layer over high-latitude regions, bulk aerosol samples were collected during eight cruises during the Chinese National Antarctic and Arctic Research Expeditions from 1998 to 2008.The concentrations of MSA (an indicator of marine biogenic sulfur production), sulfate,sodium and chloride in samples were analyzed using ion chromatography. Increases in the aerosol MSA concentrations and MSA/nss-SO4 2 ratios were observed as functions of latitudes in the Pacific Ocean, more abruptly near high southern latitudes as compared to those in high northern latitudes. The MSA concentrations increased from 0.011 mg m-3 near the equator to 0.26 mg m-3 at 63°S, 23°W and from 0.0013 mg m-3 at northern midlatitudes to 0.19 mg m-3 at 58°N, 175°E. However, MSA decreased in the latitudes north of 58°N in the Pacific, where air temperature was lower. MSA/nss-SO4 2 ratios increased from 0.024 near the equator to 0.93 at 62°S, 4°E and from 0.0031 around northern midlatitudes to 0.39 at 68°N, 169°W. The MSA concentrations were more correlated with MSA/nss-SO4 2 (R2 = 0.43, n = 60) in Southern Hemisphere than Northern Hemisphere (R2 = 0.091, n = 40). No significant correlation was found between MSA/nss-SO4 2 and air temperature at high latitudes, indicating latitudinal temperature variations were not a main factor responsible for the MSA/nss-SO4 2 variation in those regions. Substantial increases in the concentrations of MSA in coastal Antarctica may indicate additional sources of biogenic S besides the emissions of dimethylsulfide from the sea.

【基金/项目】 石羊河流域绿洲城市化的生态环境效应与调控对策研究-以武威市凉州区为例 ; 北极新奥尔松地区沉积物中粪甾醇对人类活动的示踪研究 ; 极区大气环境遥感监测技术 ; 2012年度极地优秀论文三等奖

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