大气科学Issue(6)：1059-1072,14.DOI:10.3878/j.issn.1006-9895.1410.14226
春季青藏高原表面感热加热的年际变化特征及其对印度夏季风爆发时间的影响
Interannual Variability of Surface Sensible Heating over the Tibetan Plateau in Boreal Spring and Its Influence on the Onset Time of the Indian Summer Monsoon
摘要
Abstract
The JRA-25 reanalysis dataset provided by the Japan Meteorological Agency (JMA) was utilized to investigate the spatiotemporal characteristics of surface sensible heating over the Tibetan Plateau (TP) in boreal spring, as well as their effect on the onset of the Indian summer monsoon (ISM). The EOF results show that the most evident interannual variability of sensible heat occurs over the central-western TP in spring; this is primarily attributed to the interannual variability of the land–air temperature difference in situ. This is demonstrated by statistical analysis, which shows that the ISM builds up early (late) with strong (weak) spring sensible heat over the central-western TP, which is not significantly correlated with ENSO events. In fact, the spring sensible heat over the central-western TP could alter the ISM onset time by changing the meridional thermal structure in both the upper and lower troposphere over the ISM region. When the spring sensible heat over the central-western TP is stronger, local ascent is enhanced followed by descent to the west of the TP, which is to the north of the ISM region. Thus, the anomalous warming induced by the adiabatic process could accelerate the seasonal transition of the meridional mean temperature gradient in the middle and upper troposphere from winter to summer. Meanwhile, the subsidence anomaly to the north of the ISM region could prevent rainfall development in situ causing the land surface temperature to increase. Thereafter, the strengthened diabatic heating of the land leads to the warm center in the lower troposphere, increasing the land-sea thermal contrast in the ISM region. As a result, the anomalous warming in both the upper and lower troposphere contributes to the early onset of the ISM under the influence of the stronger spring sensible heat over the central-western TP.关键词
春季青藏高原感热/年际变化/印度夏季风爆发Key words
Spring sensible heat over the Tibetan Plateau/Interannual variability/Indian summer monsoon onset分类
天文与地球科学引用本文复制引用
张盈盈,李忠贤,刘伯奇..春季青藏高原表面感热加热的年际变化特征及其对印度夏季风爆发时间的影响[J].大气科学,2015,(6):1059-1072,14.基金项目
国家重点基础研究发展计划（973计划）项目2015CB453202，公益性行业（气象）科研专项GYHY201306030，国家自然科学基金项目91337216、41475057、41505049，中国博士后科学基金资助项目2013M540128，江苏省高校自然科学研究项目13KJB170013，江苏省高校“青蓝工程”项目 （）
