globalchange  > 全球变化的国际研究计划
DOI: 10.1002/joc.5888
Scopus ID: 2-s2.0-85056692072
Impacts of April snow cover extent over Tibetan Plateau and the central Eurasia on Indian Ocean Dipole
Author: Yuan C.; Li W.; Guan Z.; Yamagata T.
Source Publication: International Journal of Climatology
ISSN: 8998418
Publishing Year: 2019
Volume: 39, Issue:3
pages begin: 1756
pages end: 1767
Language: 英语
Scopus Keyword: Atmospheric thermodynamics ; Barium compounds ; Oceanography ; Tropics ; Confidence levels ; Correlation coefficient ; Coupled Model Intercomparison Project ; Dipole mode indices ; Indian Ocean dipole ; Indian ocean dipoles ; Snow cover extents ; Tropical Indian ocean ; Snow
English Abstract: It has been widely accepted that the Indian Ocean Dipole (IOD) can influence the global climate and thus improvement of its understanding is beneficial to our society. In this study, we show that the April snow cover extents (SCEs) over Tibetan Plateau and the central Eurasia may play an important role on triggering the occurrence of IOD. The correlation coefficient between the April SCE indices and the subsequent September–November dipole mode indices is −0.51 in the recent 40 years, significant at the 99% confidence level. In years with the larger April SCEs, the thermally driven ascending over the plateau becomes weaker and causes anomalous subsidence over the plateau and its southern contiguous region. This, together with the cooler-than-normal continent, can delay the onset of Bay of Bengal (BOB) summer monsoon. As a result, the northwards migration of the major rainbelt from the eastern tropical Indian Ocean to the eastern BOB in accordance with the monsoon onset will be delayed, leading to increased precipitation in the eastern tropical Indian Ocean. The increased precipitation may lead to generation of the negative IOD through the local air–sea interactions. The observed April SCEs–IOD relation has been examined in historical runs of 19 coupled models participating phase 5 of the Coupled Model Intercomparison Project (CMIP5). Most models except MRI-CGCM3 fail to reproduce the observed April SCEs–IOD relationship. This is probably due to their difficulties in realistically simulating the snow impacts on the BOB summer monsoon and the air–sea coupling during the IOD development. © 2018 Royal Meteorological Society
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被引频次[WOS]:3   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:全球变化的国际研究计划

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Affiliation: Key Laboratory of Meteorological Disaster of Ministry of Education, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China; Application Laboratory, Japan Agency for Marine-Earth Science & Technology, Yokohama, Japan; Hebei Sub-Center of China Meteorological Administration Training Center, Hebei, China

Recommended Citation:
Yuan C.,Li W.,Guan Z.,et al. Impacts of April snow cover extent over Tibetan Plateau and the central Eurasia on Indian Ocean Dipole[J]. International Journal of Climatology,2019-01-01,39(3)
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