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DOI | 10.5194/acp-19-6419-2019 |
Sensitivity of Arctic sulfate aerosol and clouds to changes in future surface seawater dimethylsulfide concentrations | |
Mahmood, Rashed1,2; von Salzen, Knut1,2; Norman, Ann-Lise3; Gali, Marti4,5,7; Levasseur, Maurice5,6 | |
2019-05-16 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2019 |
卷号 | 19期号:9页码:6419-6435 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; Spain |
英文摘要 | Dimethylsulfide (DMS), outgassed from ocean waters, plays an important role in the climate system, as it oxidizes to methane sulfonic acid (MSA) and sulfur dioxide (SO2), which can lead to the formation of sulfate aerosol. Newly formed sulfate aerosol resulting from DMS oxidation may grow by condensation of gases, in-cloud oxidation, and coagulation to sizes where they may act as cloud condensation nuclei (CCN) and influence cloud properties. Under future global warming conditions, sea ice in the Arctic region is expected to decline significantly, which may lead to increased emissions of DMS from the open ocean and changes in cloud regimes. In this study we evaluate impacts of DMS on Arctic sulfate aerosol budget, changes in cloud droplet number concentration (CDNC), and cloud radiative forcing in the Arctic region under current and future sea ice conditions using an atmospheric global climate model. Given that future DMS concentrations are highly uncertain, several simulations with different surface seawater DMS concentrations and spatial distributions in the Arctic were performed in order to determine the sensitivity of sulfate aerosol budgets, CDNC, and cloud radiative forcing to Arctic surface seawater DMS concentrations. For any given amount and distribution of Arctic surface seawater DMS, similar amounts of sulfate are produced by oxidation of DMS in 2000 and 2050 despite large increases in DMS emission in the latter period due to sea ice retreat in the simulations. This relatively low sensitivity of sulfate burden is related to enhanced sulfate wet removal by precipitation in 2050. However simulated aerosol nucleation rates are higher in 2050, which results in an overall increase in CDNC and substantially more negative cloud radiative forcing. Thus potential future reductions in sea ice extent may cause cloud albedos to increase, resulting in a negative climate feedback on radiative forcing in the Arctic associated with ocean DMS emissions. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000468193700001 |
WOS关键词 | LOG-NORMAL APPROXIMATION ; SEA-SALT AEROSOL ; DMS CONCENTRATION ; OCEANIC PHYTOPLANKTON ; CONDENSATION NUCLEI ; ATMOSPHERIC SULFUR ; SATELLITE DATA ; CLIMATE-CHANGE ; GAS-EXCHANGE ; BLACK CARBON |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183231 |
专题 | 地球科学 |
作者单位 | 1.Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC, Canada; 2.Environm & Climate Change Canada, Canadian Ctr Climate Modelling & Anal, Victoria, BC, Canada; 3.Univ Calgary, Dept Phys & Astron, Calgary, AB, Canada; 4.Univ Laval, Takuvik Joint Int Lab, Quebec City, PQ, Canada; 5.Univ Laval, Quebec Ocean, Quebec City, PQ, Canada; 6.Univ Laval, Dept Biol, Quebec City, PQ, Canada; 7.Barcelona Supercomp Ctr, Climate Predict Grp, Barcelona, Spain |
推荐引用方式 GB/T 7714 | Mahmood, Rashed,von Salzen, Knut,Norman, Ann-Lise,et al. Sensitivity of Arctic sulfate aerosol and clouds to changes in future surface seawater dimethylsulfide concentrations[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(9):6419-6435. |
APA | Mahmood, Rashed,von Salzen, Knut,Norman, Ann-Lise,Gali, Marti,&Levasseur, Maurice.(2019).Sensitivity of Arctic sulfate aerosol and clouds to changes in future surface seawater dimethylsulfide concentrations.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(9),6419-6435. |
MLA | Mahmood, Rashed,et al."Sensitivity of Arctic sulfate aerosol and clouds to changes in future surface seawater dimethylsulfide concentrations".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.9(2019):6419-6435. |
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