首页|夏季南亚高压多中心特征及其热力影响因子分析

夏季南亚高压多中心特征及其热力影响因子分析

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
采用美国NCEP/NCAR I、NCEP/DOE Ⅱ和日本气象厅JRA-55(Japanese 55-year Reanalysis Project)的月平均环流场和非绝热加热场资料,分析了夏季南亚高压多中心结构特征,探讨了不同区域高压中心的动力和热力结构,及其与不同地区热源的关系.结果表明:(1)夏季南亚高压存在显著多中心特征,可达5～6个,其中双中心类和三中心类占比例最多,约70％～80％,其次,单中心类和四中心类分别约占10％左右.(2)无论中心个数的多或少,小同区域的南亚高压中心的动力结构和热力结构不同,大致可以分为三个区域20°～70°E、80°～120°E和120°～160°E.20°～70°E伊朗高原及其以西上空南亚高压中心中层对应伊朗副高的东北侧,低层对应印缅槽的西北部,整层为下沉运动;80°～120°E青藏高原到我国东部上空南亚高压中心低层对应印缅槽中部,低层正涡度高层负涡度,整层为强上升运动;120°～160°E西太平洋地区南亚高压中心中低层都对应西太平洋副热带高压的西部,整层负涡度,对应上升运动.(3)三个区域的高压中心都对应着暖中心结构,20°～70°E区域以下沉增温加热为主导,80°～120°E和120°～160°E区域以深对流加热为主导.(4)当20°～70°E、80°～120°E和120°～160°E区域存在高压中心时,对应区域的南亚高压环流的增强,对局地环流、深对流和降水有着显著的影响.
Analysis on the Multi-center Structure of Summer South Asia High and Its Thermal Influence Factors
The multi-center characteristic of the summer South Asia high (SSAH) is analyzed based on circulation fields and diabatic heating fields extracted from the NCEP/NCAR I,the NCEP/DOE Ⅱ and the JRA-55 (Japanese 55-year Reanalysis Project) reanalysis datasets.Moreover,the vertical dynamic and thermodynamic structures of the SSAH centers in different areas and their relationships with heat sources at different regions are studied.Results show that:(1) The SSAH demonstrates an obvious multi-center feature.It can have up to five to six centers simultaneously.Among all the multi-center cases,two-center and three-center cases account for the largest proportion (about 70％-80％) of the total,while one-center and four-center cases only account for about 10％ of the total cases.(2) No matter how many centers the SSAH has,the dynamic and thermodynamic features of these SSAH centers show different characteristics in different regions.These regions can be divided into three areas,i.e.20°-70°E,80°-120°E and 120°-160°E.For the SSAH centers over the Iranian plateau and its west region within 20°-70°E,the middle levels of the SSAH centers correspond to northeastern Iranian subtropical high and the lower levels correspond to northwestern India-Burma trough,where a strong descending motion occupies the entire troposphere.For the SSAH centers located from the Tibetan Plateau to eastern China within 80°-120°E region,their lower levels correspond to central-northem India-Burma trough,where a strong ascending motion occupies the entire troposphere with anticyclonic circulation in the upper levels and cyclonic circulation in the lower levels.For the SSAH centers over the westem Pacific within 120°-160°E region,their middle and lower levels correspond to the western Pacific subtropical high,where an ascending motion is significant with anticyclonic circulation throughout the entire troposphere.(3) All the SSAH centers in the three regions display a warm-high structure.Subsidence heating is the main reason for the formation and maintenance of the SSAH centers within 20°-70°E region,while the deep convective heating is the main reason for the formation and maintenance of the SSAH centers within 80°-120°E and 120°-160°E regions.(4) The enhanced SSAH has significant impacts on local circulation,deep convection and precipitation in all the three areas,i.e.20°-70°E,80°-120°E and 120°-160°E,where the SSAH centers are located.

South Asia highMulti-centerConvective heatingTibetan Plateau

彭丽霞、孙照渤、陈海山、朱伟军、曾刚、倪东鸿

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南京信息工程大学气象灾害预报预警与评估协同创新中心/气象灾害教育部重点实验室 南京210044

南亚高压 多中心 对流加热 青藏高原

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金科技部公益性行业(气象)科研专项科技部公益性行业(气象)科研专项江苏省高校自然科学研究项目江苏省自然科学基金——杰出青年基金新世纪优秀人才支持计划

41105059611031424123042241575070412050664157510241475088GYHY201306028GYHY20120601711KJB170006BK20130047

2016

10.3878/j.issn.1006-9895.1601.14310

大气科学
中国科学院大气物理研究所

大气科学

CSTPCDCSCD北大核心
影响因子：2.11
ISSN：1006-9895
年,卷(期)：2016.40(5)
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