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Sci Rep:中大杨崧教授团队发表春季西太平洋-东亚气候研究进展

摘要 : 2016年7月27日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reports》杂志在线发表了中山大学杨崧教授研究组、中国科学院大气物理研究所何编博士、南京大学胡春迪博士共同合作题为“Intensified Springtime Deep Convection over the South China Sea and the Philippine Sea Dries Southern China”的研究论文

 2016年7月27日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reports》杂志在线发表了中山大学杨崧教授研究组、中国科学院大气物理研究所何编博士、南京大学胡春迪博士共同合作题为“Intensified Springtime Deep Convection over the South China Sea and the Philippine Sea Dries Southern China”的研究论文,创新性地探讨了30年以上长期气候趋势尺度下春季南中国海和菲律宾海深对流加热增强对中国南方地区春季降水的显著动力抑制作用。博士生李振宁为论文第一作者,杨崧教授为论文通讯作者。

该研究成果揭示了,在1979-2013过去的35年里,春季南中国海及菲律宾海降水显著增多,对应的深对流凝结潜热释放有可观量级的增强趋势;与此同时,中国南方地区春季降水有显著减少趋势,春旱增多。作者分别利用全耦合以及理想大气模式证明了:由于春季南中国海及菲律宾海对流凝结潜热释放增强,强迫出异常的经向环流圈,其中下沉支位于中国南部地区,这一强迫作用通过减弱局地的气柱水汽辐合以及抑制上升运动,使得春季中国南部地区降水减少。

春季降水在中国南部扮演重要角色,部分地区春季降水可达到年总降水的40%。这一研究成果则为未来气候变化背景下春季中国南部地区降水预估提供了新的思路。

原文链接:

Intensified Springtime Deep Convection over the South China Sea and the Philippine Sea Dries Southern China

原文摘要:

Springtime rainfall, accounting for 25–40% of the annual rainfall in southern China, exerts great agricultural and socioeconomic impacts on the region. In the recent decades, southern China has experienced a significant declining trend of precipitation in boreal spring. Meanwhile, precipitation has increased over the South China Sea and the Philippine Sea (SCS-PhS). This paper presents observational and modeling evidences suggesting that the intensified latent heating released by the convection over SCS-PhS leads to suppressed springtime rainfall over southern China. Moisture budget analysis indicates that the drying trend over southern China is due mainly to weakened convergence of moisture flux, which is controlled by a heat-induced anomalous overturning circulation reinforced by the convection over SCS-PhS. Further idealized simulations support the feature that the heat-induced overturning circulation and its corresponding anomalous cyclone can be well established in several days under the spring mean flow condition. Thus, this rapid dynamic process is associated with both the intraseasonal-to-interannual variations and the long-term change of the springtime rainfall over southern China.

来源: Scientific Reports 浏览次数:0

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