A possible mechanism for the co‐variability of the boreal spring Antarctic Oscillation and the Yangtze River valley summer rainfall

Sun, Jianqi; Wang, Huijun; Yuan, Weihua

doi:10.1002/joc.1773

Cited by 81 publications

(43 citation statements)

References 40 publications

(60 reference statements)

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“…SST anomalies associated with summer LLA CEFs emerged to the north and east of Australia in spring (Fig. 5) and then spread northward and intensified in summer, accompanying the seasonal advancement of the intertropical convergence zone (Sun et al, 2009). The spring LLA CEFs and summer rainfall observations show a correlation pattern quite similar to that of summer CEFs and rainfall (with negative values in the region between middle Yellow River and Yangtze River and positive in southern China), though the significant area was much smaller (not shown).…”

Section: Connections With Sstmentioning

confidence: 97%

Variations of the summer Somali and Australia cross-equatorial flows and the implications for the Asian summer monsoon

Zhu

2012

Adv. Atmos. Sci.

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The temporal variations during 1948-2010 and vertical structures of the summer Somali and Australia cross-equatorial flows (CEFs) and the implications for the Asian summer monsoon were explored in this study. The strongest southerly and northerly CEFs exist at 925 hPa and 150 hPa level, respectively. The low-level Somali (LLS) CEFs were significantly connected with the rainfall in most regions of India (especially the monsoon regions), except in a small area in southwest India. In comparison to the climatology, the lowlevel Australia (LLA) CEFs exhibited stronger variations at interannual time scale and are more closely connected to the East Asian summer monsoon circulation than to the LLS CEFs.The East Asian summer monsoon circulation anomalies related to stronger LLA CEFs were associated with less water vapor content and less rainfall in the region between the middle Yellow River and Yangtze River and with more water vapor and more rainfall in southern China. The sea-surface temperature anomalies east of Australia related to summer LLA CEFs emerge in spring and persist into summer, with implications for the seasonal prediction of summer rainfall in East Asia. The connection between the LLA CEFs and East Asian summer monsoon rainfall may be partly due to its linkage with El Nino-Southern Oscillation. In addition, both the LLA and LLS CEFs exhibited interdecadal shifts in the late 1970s and the late 1990s, consistent with the phase shifts of Pacific Decadal Oscillation (PDO).Citation: Zhu, Y. L., 2012: Variations of the summer Somali and Australia cross-equatorial flows and the implications for the Asian summer monsoon.

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Section: Connections With Sstmentioning

confidence: 97%

Variations of the summer Somali and Australia cross-equatorial flows and the implications for the Asian summer monsoon

Zhu

2012

Adv. Atmos. Sci.

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“…More recently, the Antarctic Oscillation (AAO) has been found to be related to the climate of the Northern Hemisphere, particularly to the East Asian summer monsoon (Xue et al 2003;Gao et al 2003;Wang and Fan 2005;Sun et al 2009) and to dust event frequency through atmospheric teleconnections (Fan and Wang 2004). These linkages suggest that this remote southern atmospheric oscillation may also significantly a¤ect climate variability in the Northern Hemisphere.…”

Section: Introductionmentioning

confidence: 99%

Linkage of the Boreal Spring Antarctic Oscillation to the West African Summer Monsoon

Sun

Wang

Yuan

2010

Journal of the Meteorological Society of Japan

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The relationship between the boreal spring (or the austral autumn) Antarctic Oscillation (AAO) (MarchApril) and the West African summer monsoon (WASM) (June-September) is analyzed based on NCEP/NCAR reanalysis data. The results show that the linkage of the boreal spring AAO to the WASM exhibits decadal-scale variations: a strong connection between the two appears over the period 1985-2006 and a weak connection over the period [1970][1971][1972][1973][1974][1975][1976][1977][1978][1979][1980][1981][1982][1983][1984]. Further analysis indicates that such an unstable relationship between the two results from the modulation by ENSO events to a large extent.A possible mechanism for the impacts of the boreal spring AAO on the WASM is also discussed. The variability of the boreal spring tropical South Atlantic sea surface temperature (SST) appears to serve as a bridge linking these two systems. The boreal spring AAO produces an anomalous SST over the tropical South Atlantic by exciting an equatorward Rossby wave train over the western Southern Hemisphere (SH). This AAO-related SST anomaly modulates the meridional gradient of moist static energy (MSE) between the Sahel and the Guinea-tropical Atlantic region in the boreal spring. The MSE gradient is of paramount importance for the changes from spring to summer in the West African monsoon because its relaxation along the seasonal cycle is linked to the northward excursion of the WASM system into the African continent. Therefore, an anomalous AAO-related MSE gradient can lead to anomalous Sahel rainfall in the early summer. When this rainfall occurs over the Sahel, the local positive soil moisture-rainfall feedback plays a crucial role in sustaining and prolonging this rainfall anomaly throughout the whole summer.

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“…and East Asian summer rainfall 3.1 Characteristics of convective activity over the WTP Many studies (Nitta 1987;Huang and Sun 1992;Lau et al 2000;Lu 2001;Sun et al 2009) have addressed the effect of the low-level circulation in the tropical western Pacific on the variability of rainfall over the East Asian region. These findings clearly show that the convective activity induced by heating in the WTP is closely related to East Asian summer rainfall.…”

Section: Relationship Between the Observed Wtp Convectionmentioning

confidence: 99%

Enhancement of seasonal prediction of East Asian summer rainfall related to western tropical Pacific convection

2014

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approach using the cross-validated EARI from the individual models and their MME. The results show that the rainfalls reconstructed from simulations capture the general features of observed precipitation in East Asia quite well. This study convincingly demonstrates that rainfall prediction skill is considerably improved by using a hybrid dynamical-statistical approach compared to the dynamical forecast alone.

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A possible mechanism for the co‐variability of the boreal spring Antarctic Oscillation and the Yangtze River valley summer rainfall

Cited by 81 publications

References 40 publications

Variations of the summer Somali and Australia cross-equatorial flows and the implications for the Asian summer monsoon

Variations of the summer Somali and Australia cross-equatorial flows and the implications for the Asian summer monsoon

Linkage of the Boreal Spring Antarctic Oscillation to the West African Summer Monsoon

Enhancement of seasonal prediction of East Asian summer rainfall related to western tropical Pacific convection

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