| 亚洲夏季风爆发的深对流特征 |
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| 引用本文： | 钱维宏,朱亚芬.亚洲夏季风爆发的深对流特征[J].气象学报,2001,59(5):578-590. |
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| 作者姓名： | 钱维宏 朱亚芬 |
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| 作者单位： | 北京大学物理学院大气科学系 |
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| 基金项目： | 国家自然科学基金项目（49825504，49975023），国家重点基础研究发展规划项目（G1999043405）。 |
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| 摘 要： | 文中应用ＮＯＡＡ卫星反演的１９８０～１９９５年候平均对流层上部水汽亮温（ＢＴ）资料、向外长波辐 射（ＯＬＲ）资料和美国ＮＭＣ全球分析８５０ ｈＰａ风资料与美国ＣＭＡＰ降水资料作了对比分析，发现Ｂ Ｔ能够较好地反映中低纬度地区的深对流降水，偏南风场辐合区与深对流降水有比较一致的 关系，而ＯＬＲ不能反映热带外地区的对流降水。ＢＴ资料所具有的这一特征可以应用于亚洲夏 季风爆发过程的深对流特征分析。ＢＴ描述深对流的临界值是２４４ Ｋ。亚洲季风区是全球深对 流季节变化范围和强度最大的地区。赤道外地区的夏季风爆发可以定义为来自热带地区深对 流的季节扩张。中南半岛上的夏季风对流发生在南海夏季风爆发之前。华南前汛期深对流是 中低纬系统相互作用的结果。第２８候，南海夏季风的突然爆发在降水、风场和卫星反演 的深对流特征上都有明确的反映。南海夏季风爆发后，印度夏季风对流由南向北逐渐爆发， 青藏高原东侧和中国东部沿海的夏季风对流向北推进早于中国中部地区。
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| 关 键 词： | 亚洲季风 爆发 深对流 特征。 |
| 收稿时间： | 6/8/1999 12:00:00 AM |
| 修稿时间： | 1999年6月8日 |
STUDY ON THE DEEP CONVECTIVE CHARACTERISTICS OF ASIAN SUMMER MONSOON ONSET |
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| Qian Weihong and Zhu Yafen.STUDY ON THE DEEP CONVECTIVE CHARACTERISTICS OF ASIAN SUMMER MONSOON ONSET[J].Acta Meteorologica Sinica,2001,59(5):578-590. |
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| Authors: | Qian Weihong and Zhu Yafen |
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| Institution: | Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871;Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871 |
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| Abstract: | In this paper, deep convective characteristics of summer monsoon onset over A sian region are investigated. Data sets used are the US Climate Prediction Cente r (CPC) Merged Analysis of precipitation (CMAP), US National Meteorological Cent er (NMC) globe wind analysis, Outgoing Longwave Radiation (OLR) and upper trop ospheric water vapor band brightness temperature (BT) observed from NOAA polar orbiting satellites for 1980-1995. The BT, OLR and wind at 850 hPa are first comp ared to the CMAP. Results show that the BT can indicate the convective precipita tion in both tropical and mid latitude regions but the OLR can not well reflect the precipitation in the region of mid latitudes. The convergence of wind fiel d can explain the burst of summer monsoon and its extension. The region of Asi an summer monsoon is the largest one of deep convection seasonal variation over the world. Also, in this paper, the summer monsoon over the mid low latitudes w as d efined as the seasonal expansion of deep convection coming from tropical region with the criterion of BT less than 244 K. The summer monsoon over the Indo Chin a Pen insula bursts before the onset of the South China Sea (SCS) summer monsoon. The deep convection over South China during the pre rainy season results from the inter a ction between middle and lower latitude systems. In the 28 th pentad, th e abrupt onset of the SCS summer monsoon can be directly identified through the mon itoring o f OLR, BT, CMAP and 850 hPa wind. After the onset of the SCS summer monsoon, the summ er monsoon of Indian subcontinent gradually sets up from south to north, while t he northward extensions of summer monsoons over the east Tibetan Plateau and the East China Sea are earlier than over central China. |
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| Keywords: | Asian monsoon Onset Deep convection Characteristics |
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