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An Overview of Dry-wet Climate Variability among monsoon-Westerly regions and the monsoon Northernmost Marginal Active Zone in China

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Advances in Atmospheric Sciences 2009年第4期26卷 630-641页

作者：钱维宏丁婷胡豪然林祥秦爱民 monsoon and Environment Research Group School of PhysicsPeking University

Climate in China's Mainland can be divided into the monsoon region in the southeast and the westerly region in the northwest as well as the intercross zone, i.e., the monsoon northernmost marginal active zone that is oriented from Southwest China to the upper Yellow River, North China, and Northeast China. In the three regions, dry-wet climate changes are directly linked to the interaction of the southerly monsoon flow on the east side of the Tibetan Plateau and the westerly flow on the north side of the Plateau from the inter-annual to inter-decadal timescales. Some basic features of climate variability in the three regions for the last half century and the historical hundreds of years are reviewed in this paper. In the last half century, an increasing trend of summer precipitation associated with the enhancing westerly flow is found in the westerly region from Xinjiang to northern parts of North China and Northeast China. On the other hand, an increasing trend of summer precipitation along the Yangtze River and a decreasing trend of summer precipitation along the monsoon northernmost marginal active zone are associated with the weakening monsoon flow in East Asia. Historical documents are widely distributed in the monsoon region for hundreds of years and natural climate proxies are constructed in the non-monsoon region, while two types of climate proxies can be commonly found over the monsoon northernmost marginal active zone. In the monsoon region, dry-wet variation centers are altered among North China, the lower Yangtze River, and South China from one century to another. Dry or wet anomalies are firstly observed along the monsoon northernmost marginal active zone and shifted southward or southeastward to the Yangtze River valley and South China in about a 70-year timescale. Severe drought events are experienced along the monsoon northernmost marginal active zone during the last 5 centuries. Inter-decadal dry-wet variations are depicted by natural proxies for

关键词： dry-wet climate variability monsoon region westerly region monsoon active zone China

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Longitudinal Heating Gradient:Another Possible Factor Influencing the Intensity of the Asian Summer monsoon Circulation

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Advances in Atmospheric Sciences 1992年第4期9卷 397-410页

作者： Song Yang Peter J.Webster Min Dong Atmospheric and Environmental Research.Inc.840 Memorial Drive CambridgeMassachusetts 02139USA The Pennsylvania State University University ParkPennsylvania 16802 USA Chinese Academy of Meteorological Science Statc Mcleorological Administration.Beijing 100081

The largest longitudinal heating gradients in the tropics exist between the African desert and Asian convective regions during summer once the South Asian monsoon is *** heating gradients are anchored by the latent heat release and net radiative flux convergence over the monsoon region,and by the dominant net radiative flux divergence over the *** apparent relationship is found between the intensity of the Asian summer monsoon circulation and the longitudinal heating gradients mentioned,in addition to the latitudinal heating gradients cross the monsoon *** monsoon circulation measured in terms of the zonal wind component is stronger when the longitudinal heating gradients are large,and vice ***,we claim that the longitudinal heating gradient may be another important factor which influences the intensity of the Asian summer monsoon *** is little evidence that the interannual variability of the longitudinal heating gradients between Africa and Asia and,thus,the intensity of the Asian summer monsoon circulation,is a strong function of the El Nino/Southern Oscillation cycle.

关键词： Asian monsoon Asian Summer monsoon monsoon region monsoon Circulation Diabatic Heating

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