Significant Underestimation of Gaseous Methanesulfonic Acid (MSA) over Southern Ocean

• DOI: 10.1021/acs.est.9b05362
• Publication Date: 2019-10-31T20:52:58Z
• Authors: Jinpei Yan; Jinyoung Jung; Miming Zhang; Suqing Xu; Qi Lin; Shuhui Zhao; Liqi Chen
• Keywords: Methanesulfonic acid; Sulfur Cycle

Methanesulfonic acid (MSA), derived from the oxidation of dimethylsulfide (DMS), has a significant impact on biogenic sulfur cycle and climate. Gaseous MSA (MSAg) been often ignored in previous studies due to its quick conversion particulate (MSAp) low concentrations. MSAg, MSAp, nss-SO42- were observed simultaneously for first time with high-time-resolution (1 h) Southern Ocean (SO). The mean MSAg level reached up 3.3 ± 1.6 pptv, ranging ∼24.5 pptv SO, contributing 31% 3% total (MSAT). A reduction ratios by about 30% was obtained when not accounted calculation, indicating that very important assessment contributions atmosphere. Mass increased then decreased temperature -10 5 °C, maximum value at -3 °C. Positive correlations between MSAT presented, higher than This study highlights importance understanding atmospheric DMS mechanism extends knowledge formation marine