期刊
ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 14, 期 14, 页码 7543-7557出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-14-7543-2014
关键词
-
资金
- Natural Environment Research Council (NERC)
- Met Office through a CASE partnership
- Royal Society
- Knut and Alice Wallenberg Foundation
- DAMOCLES European Union 6th Framework Programme Integrated Research Project
- Swedish Research Council (VR)
- EU [603445-BACCHUS]
- NERC ACCACIA project [NE/I028858/1]
- Natural Environment Research Council [ncas10009, NE/I028858/1, 1230241] Funding Source: researchfish
- NERC [NE/I028858/1] Funding Source: UKRI
Loss of summertime Arctic sea ice will lead to a large increase in the emission of aerosols and precursor gases from the ocean surface. It has been suggested that these enhanced emissions will exert substantial aerosol radiative forcings, dominated by the indirect effect of aerosol on clouds. Here, we investigate the potential for these indirect forcings using a global aerosol microphysics model evaluated against aerosol observations from the Arctic Summer Cloud Ocean Study (ASCOS) campaign to examine the response of Arctic cloud condensation nuclei (CCN) to sea-ice retreat. In response to a complete loss of summer ice, we find that north of 70 degrees N emission fluxes of sea salt, marine primary organic aerosol (OA) and dimethyl sulfide increase by a factor of similar to 10, similar to 4 and similar to 15 respectively. However, the CCN response is weak, with negative changes over the central Arctic Ocean. The weak response is due to the efficient scavenging of aerosol by extensive drizzling stratocumulus clouds. In the scavenging-dominated Arctic environment, the production of condensable vapour from oxidation of dimethyl sulfide grows particles to sizes where they can be scavenged. This loss is not sufficiently compensated by new particle formation, due to the suppression of nucleation by the large condensation sink resulting from sea-salt and primary OA emissions. Thus, our results suggest that increased aerosol emissions will not cause a climate feedback through changes in cloud microphysical and radiative properties.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据