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DOI | 10.1175/JCLI-D-17-0819.1 |
Simulated Dust Aerosol Impacts on Western Sahelian Rainfall: Importance of Ocean Coupling | |
Jordan, Asha K.; Gnanadesikan, Anand; Zaitchik, Benjamin | |
2018-11-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:22页码:9107-9124 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | North Africa is the world's largest source of mineral dust, and this dust has potentially significant impacts on precipitation. Yet there is no consensus in published studies regarding the sign or magnitude of dust impacts on rainfall in either the highly climate-sensitive Sahel region of North Africa or the neighboring tropical Atlantic Ocean. Here the Geophysical Fluid Dynamics Laboratory (GFDL) Climate Model 2 (GFDL CM2.0) with Modular Ocean Model, version 4.1 (MOM4.1), run at coarse resolution (CM2Mc) is applied to investigate one poorly characterized aspect of dust-precipitation dynamics: the importance of sea surface temperature (SST) changes in mediating the atmospheric response to dust. Two model experiments were performed: one comparing Dust-On to Dust-Off simulations in the absence of ocean-atmosphere coupling, and the second comparing Dust-On to Dust-Off with the ocean fully coupled. Results indicate that SST changes in the coupled experiment reduce the magnitude of dust impacts on Sahel rainfall and flip the sign of the precipitation response over the nearby ocean. Over the Sahel, CM2Mc simulates a net positive impact of dust on monsoon season rainfall, but ocean-atmosphere coupling in the presence of dust decreases the inflow of water vapor, reducing the amount by which dust enhances rainfall. Over the tropical Atlantic Ocean, dust leads to SST cooling in the coupled experiment, resulting in increased static stability that overrides the warming-induced increase in convection observed in the uncoupled experiment and yields a net negative impact of dust on precipitation. These model results highlight the potential importance of SST changes in dust-precipitation dynamics in North Africa and neighboring regions. |
英文关键词 | Africa Large-scale motions Monsoons Atmosphere-ocean interaction Climate models Aerosol radiative effect |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000447530600001 |
WOS关键词 | 3-DIMENSIONAL STRUCTURE ; CLIMATE MODELS ; MINERAL DUST ; PART II ; SEA ; PRECIPITATION ; RESPONSES ; DYNAMICS ; AFRICA ; CIRCULATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | 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/19862 |
专题 | 气候变化 |
作者单位 | Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA |
推荐引用方式 GB/T 7714 | Jordan, Asha K.,Gnanadesikan, Anand,Zaitchik, Benjamin. Simulated Dust Aerosol Impacts on Western Sahelian Rainfall: Importance of Ocean Coupling[J]. JOURNAL OF CLIMATE,2018,31(22):9107-9124. |
APA | Jordan, Asha K.,Gnanadesikan, Anand,&Zaitchik, Benjamin.(2018).Simulated Dust Aerosol Impacts on Western Sahelian Rainfall: Importance of Ocean Coupling.JOURNAL OF CLIMATE,31(22),9107-9124. |
MLA | Jordan, Asha K.,et al."Simulated Dust Aerosol Impacts on Western Sahelian Rainfall: Importance of Ocean Coupling".JOURNAL OF CLIMATE 31.22(2018):9107-9124. |
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