globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-016-3220-6
Scopus记录号: 2-s2.0-85016240692
论文题名:
Modulation of the Southern Africa precipitation response to the El Niño Southern Oscillation by the subtropical Indian Ocean Dipole
作者: Hoell A.; Funk C.; Zinke J.; Harrison L.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期:2017-07-08
起始页码: 2529
结束页码: 2540
语种: 英语
英文关键词: El Nino-Southern Oscillation ; Precipitation ; Southern Africa ; Subtropical Indian Ocean Dipole
英文摘要: The climate of Southern Africa, defined as the land area bound by the region 15°S–35°S; 12.5°E–42.5°E, during the December–March rainy season is driven by Indo-Pacific sea surface temperature (SST) anomalies associated with the El Niño Southern Oscillation (ENSO) and the Subtropical Indian Ocean Dipole (SIOD). The observed December–March 1979–2014 Southern Africa precipitation during the four ENSO and SIOD phase combinations suggests that the phase of the SIOD can disrupt or enhance the Southern Africa precipitation response to ENSO. Here, we use a large ensemble of model simulations driven by global SST and ENSO-only SST to test whether the SIOD modifies the relationship between Southern Africa precipitation and ENSO. Since ENSO-based precipitation forecasts are used extensively over Southern Africa, an improved understanding of how other modes of SST variability modulate the regional response to ENSO is important. ENSO, in the absence of the SIOD, forces an equivalent barotropic Rossby wave over Southern Africa that modifies the regional mid-tropospheric vertical motions and precipitation anomalies. El Niño (La Niña) is related with high (low) pressure over Southern Africa that produces anomalous mid-tropospheric descent (ascent) and decreases (increases) in precipitation relative to average. When the SIOD and ENSO are in opposite phases, the SIOD compliments the ENSO-related atmospheric response over Southern Africa by strengthening the regional equivalent barotropic Rossby wave, anomalous mid-tropospheric vertical motions and anomalous precipitation. By contrast, when the SIOD and ENSO are in the same phase, the SIOD disrupts the ENSO-related atmospheric response over Southern Africa by weakening the regional equivalent barotropic Rossby wave, anomalous mid-tropospheric vertical motions and anomalous precipitation. © 2016, Springer-Verlag (outside the USA).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53274
Appears in Collections:过去全球变化的重建

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作者单位: NOAA Earth System Research Laboratory Physical Sciences Division, 325 Broadway, Boulder, CO, United States; Department of Geography, University of California Santa Barbara, Santa Barbara, CA, United States; Earth Resources Observation and Science Center, U.S. Geological Survey, Sioux Falls, SD, United States; Institut für Geologische Wissenschaften, Freie Universität Berlin, Berlin, Germany; Department of Environment and Agriculture, Curtin University of Technology, Bentley, Australia; Australian Institute of Marine Science, Cape Ferguson, Australia; School of Geography, Archaeology and Environmental Studies, University of Witwatersrand, Johannesburg, South Africa

Recommended Citation:
Hoell A.,Funk C.,Zinke J.,et al. Modulation of the Southern Africa precipitation response to the El Niño Southern Oscillation by the subtropical Indian Ocean Dipole[J]. Climate Dynamics,2017-01-01,48(2017-07-08)
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