Surface and free tropospheric sources of methanesulfonic acid over the tropical Pacific Ocean

被引：10

作者：

Zhang, Yuzhong ^{[1
]}

Wang, Yuhang ^{[1
]}

Gray, Burton Alonza ^{[1
]}

Gu, Dasa ^{[1
]}

Mauldin, Lee ^{[2
,3
]}

Cantrell, Christopher ^{[2
]}

Bandy, Alan ^{[4
]}

机构：

[1] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

[2] Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA

[3] Univ Helsinki, Dept Phys, Helsinki, Finland

[4] Drexel Univ, Dept Chem, Philadelphia, PA 19104 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2014年 / 41卷 / 14期

关键词：

MARINE BOUNDARY-LAYER; EQUATORIAL PACIFIC; FIELD OBSERVATIONS; DIMETHYL SULFIDE; ATMOSPHERIC SULFUR; MODEL SIMULATIONS; DMS OXIDATION; SO2; OH; NUCLEATION;

D O I：

10.1002/2014GL060934

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The production of sulfate aerosols through sulfur chemistry in marine environments is critical to the tropical climate system. However, not all sulfur compounds have been studied in detail. One such compound is methanesulfonic acid (MSA). In this study, we use a one-dimensional chemical transport model to analyze the observed vertical profiles of gas phase MSA during the Pacific Atmospheric Sulfur Experiment. The observed sharp decrease in MSA from the surface to 600 m implies a surface source of 4.0x10(7) molecules/cm(2)/s. Evidence suggests that this source is photolytically enhanced in daytime. We also find that the observed large increase of MSA from the boundary layer into the lower free troposphere (1000-2000 m) results mainly from the degassing of MSA from dehydrated aerosols. We estimate a source of 1.2 x 10(7) molecules/cm(2)/s to the free troposphere through this pathway. This source of soluble MSA could potentially provide an important precursor for new particle formation in the free troposphere over the tropics, affecting the climate system through aerosol-cloud interactions.

引用

页码：5239 / 5245

页数：7

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