VARIATIONS IN THE METHANESULFONATE TO SULFATE MOLAR RATIO IN SUBMICROMETER MARINE AEROSOL-PARTICLES OVER THE SOUTH-PACIFIC OCEAN
VARIATIONS IN THE METHANESULFONATE TO SULFATE MOLAR RATIO IN SUBMICROMETER MARINE AEROSOL-PARTICLES OVER THE SOUTH-PACIFIC OCEAN
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DOI：
10.1029/92jd00411
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发表时间：
1992-06-20
影响因子：
4.4
通讯作者：
QUINN, PK
中科院分区：
文献类型：
--
作者：
BATES, TS;CALHOUN, JA;QUINN, PK
1989年2月至3月，在东太平洋105度至110度西经20度至60度的海域，测量了海水中二甲基硫的浓度以及大气中二甲基硫、二氧化硫、甲烷磺酸盐和非海盐硫酸盐的浓度。尽管在南半球采集的样品似乎来自海洋，但DMS、SO2、MSA和NSS SO4=的纬度分布之间没有明显的相关性。然而，大气温度与亚微米气溶胶颗粒中MSA与NSS SO4=摩尔比之间存在负相关(R2=0.87)，温度的降低对应于摩尔比的增加。尽管这一趋势与实验室结果一致，表明在较低温度下有利于MSA的生产，但与南半球基线站点数据相反。这表明冬季基准站DMS的供应相对于NSS SO4=的非海洋来源有所减少，或者是影响MSA和NSS SO4=的相对产量的额外机制。
Seawater concentrations of dimethylsulfide (DMS) and atmospheric concentrations of DMS, sulfur dioxide, methanesulfonate (MSA), and non-sea-salt (nss) sulfate were measured over the eastern Pacific Ocean between 105-degrees and 110-degrees-W from 20-degrees-N to 60-degrees-S during February and March 1989. Although the samples collected in the southern hemisphere appear to be of marine origin, no significant correlation was found between the latitudinal distributions of DMS, SO2, MSA, and nss SO4=. However, an inverse correlation (r2 = 0.87) was found between atmospheric temperature and the MSA to nss SO4= molar ratio in submicrometer aerosol particles with a decrease in temperature corresponding to an increase in the molar ratio. Although this trend is consistent with laboratory results indicating the favored production of MSA at lower temperatures, it is contrary to southern hemisphere baseline station data. This suggests either a decrease in the supply of DMS relative to nonmarine sources of nss SO4= at the baseline stations in winter or additional mechanisms that affect the relative production of MSA and nss SO4=.