globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD026014
论文题名:
Sahel precipitation and regional teleconnections with the Indian Ocean
作者: Dyer E.L.E.; Jones D.B.A.; Li R.; Sawaoka H.; Mudryk L.
刊名: Journal of Geophysical Research: Atmospheres
出版年: 2017
卷: 122, 期:11
起始页码: 5654
结束页码: 5676
语种: 英语
英文关键词: Indian Ocean ; precipitation ; regional teleconnections ; Sahel
英文摘要: The drought in the Sahel in the 1980s has been associated with Indian Ocean warming, although the Sahel has experienced a recovery in precipitation since the 1990s, despite continued warming in the Indian Ocean. Using the Community Earth System Model (CESM), we examined the linkages between the pattern of Indian Ocean warming and changes in atmospheric circulation over the Indian Ocean and North Africa to determine how they impact Sahel precipitation. The influence of the Indian Ocean on Sahel precipitation was investigated using a series of sea surface temperature (SST) sensitivity experiments. We identified two mechanisms by which the Indian Ocean can alter Sahel precipitation. The first mechanism is associated with perturbations in SSTs on the equator that alter Sahel precipitation by modulating the Asian monsoon circulation and driving changes in descent in North Africa. The second mechanism is associated with SST perturbations that cover more of the basin and alter the overturning circulation between the Indian and Atlantic Oceans. These two mechanisms result in different precipitation responses in the Sahel: the first induces an increase in precipitation as a result of warming in the Indian Ocean, whereas the second produces a decrease in Sahel precipitation in response to warming. Our results suggest that obtaining robust projections of precipitation in the Sahel will require reliably capturing the scale and spatial patterns of Indian Ocean warming. ©2017. American Geophysical Union. All Rights Reserved.
资助项目: "This work was supported by the Natural Science and Engineering Research Council (NSERC) of Canada. We thank Paul Kushner, Kimberly Strong, and Alessandra Giannini for helpful comments. The CESM project is supported by the National Science Foundation and the Office of Science (BER) of the U.S. Department of Energy. Computations were performed on the TCS supercomputer at the SciNet HPC Consortium. SciNet is funded by the Canada Foundation for Innovation under the auspices of Compute Canada, the Government of Ontario, Ontario Research Fund–Research Excellence, and the University of Toronto. ERA-Interim reanalysis data from ECMWF is available at http://apps.ecmwf.int/datasets/. The CRU TS 3.0 rainfall data set is available for download at https://crudata.uea.ac.uk/cru/data/hrg/.
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被引频次[WOS]:10   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62668
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Department of Physics, University of Toronto, Toronto, ON, Canada

Recommended Citation:
Dyer E.L.E.,Jones D.B.A.,Li R.,et al. Sahel precipitation and regional teleconnections with the Indian Ocean[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(11)
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