| 多套大气再分析资料的南亚高压强度变化特征及其与海表温度异常关系的比较分析 |
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| 引用本文： | 曾刚,伯忠凯,倪东鸿,李忠贤.多套大气再分析资料的南亚高压强度变化特征及其与海表温度异常关系的比较分析[J].南京气象学院学报,2013(5):577-585. |
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| 作者姓名： | 曾刚 伯忠凯 倪东鸿 李忠贤 |
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| 作者单位： | [1]气象灾害教育部重点实验室南京信息工程大学,江苏南京210044 [2]高原大气与环境四川省重点实验室,四川成都610225 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）项目（2013CB430202）;公益性行业（气象）科研专项（GYHY201306020）;江苏省自然科学基金面上项目（BK20131431）;江苏省高校自然科学研究项目（12KJB170007）;高原大气与环境四川省重点实验室开放课题（PAEKL-2013-K1）;江苏省高校“青蓝工程” |
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| 摘 要： | 以往的研究中多采用NCE/NCAR再分析资料来讨论南亚高压的变化特征及其与海表温度的关系，鉴于其分析结果具有一定的片面性，本文采用ERA40、ERA—Interim、NCEWNCAR、NCEP—DOE和JRA．25五套再分析资料，以及应用全球、热带印度洋和热带大西洋1978--2008年逐月观测海表温度分别驱动NCARCAM5．1全球大气环流模式的数值模拟结果，比较了它们的夏季南亚高压强度变化特征及其与海表温度的关系。再分析资料问的比较结果表明，NCEWNCAR、NCEP—DOE两套再分析资料与ERA40、ERA—Interim、JRA-25三套再分析资料的南亚高压强度变化在20世纪70年代末至90年代初存在非常明显的差异，前两套再分析资料揭示的该时段南亚高压强度显著偏高，可能是不真实的，进而导致南亚高压强度与海表温度异常的关系与后三套再分析资料的结果差异明显。ERA40、ERA—Interim和JRA-25三套再分析资料和数值试验结果均表明，20世纪70年代末以后，夏季南亚高压强度异常与前期冬季、春季及同期夏季的热带印度洋海表温度异常关系持续密切，表明热带印度洋是影响夏季南亚高压强度变化的关键海区。当热带印度洋偏暖时，热带地区对流层温度增暖，南亚高压强度增强、面积增大、南扩、东伸西展，反之亦然。
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| 关 键 词： | 大气再分析资料 南亚高压强度 海表温度异常 数值模拟 对比分析 |
Comparison analysis of South Asia high intensity variation and its relation to SSTA in atmospheric multi-reanalysis data |
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| ZENG Gang,BO Zhong-kai,NI Dong-hong,LI Zhong-xian.Comparison analysis of South Asia high intensity variation and its relation to SSTA in atmospheric multi-reanalysis data[J].Journal of Nanjing Institute of Meteorology,2013(5):577-585. |
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| Authors: | ZENG Gang BO Zhong-kai NI Dong-hong LI Zhong-xian |
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| Institution: | . ( 1. Key Laboratory of Meteorological Disaster( NUIST), Ministry of Education, Nanjing 210044, China 2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu 610225 ,China) |
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| Abstract: | The NCEP/NCAR reanalysis data are mostly used to investigate the variability of South Asi- an high（SAH） and its relation to sea surface temperature （SST） in previous studies, but the results from these studies have one-sidedness. Thus, this paper compares the summer SAH intensity variation and its relation to SSTs using five reanalysis data （ERA-40, ERA-Interim, NCEP/NCAR, NCEP-DOE and JRA-25 ） and three simulation results from which the atmospheric general circulation model NCAR CAMS. 1 is driven by the observed monthly global, tropical Indian Ocean and tropical Atlantic Ocean SSTs during 1978--2008 ,respectively. Comparisons in SAH intensity among these reanalyses show that there is a very distinct difference in SAH intensity variation between the two reanalyses（ NCEP/NCARand NCEP-DOE） and the other three reanalyses （ERA-40, ERA-Interim and JRA-25 ） during the period of the late 1970s to the early 1990s, indicating that the abrupt increase of SAH intensity in NCEP/ NCAR and NCEP-DOE reanalyses maybe not true during this period. The possible false data lead to a distinct difference in relation of SAH intensity to SST anomaly between the former two reanalyses and the latter three. Results from the three reanalyses （ ERA-40, ERA-Interim and JRA-25 ） and three experi- ments show that summer SAH intensity anomaly is closely associated with the tropical Indian Ocean SST anomaly in previous winter,previous spring and contemporaneous summer after 1970s, indicating that the tropical Indian Ocean is a key area to affect the summer SAH intensity. When the tropical Indi- an Ocean is warmer than the normal, the tropospheric temperature will be warmer in tropics, in such a way that SAH intensity will be enhanced, SAH area enlarged, and SAH location extended southward, eastward and westward, and vice visa. |
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| Keywords: | atmospheric reanalysis data South Asian high intensity sea surface temperature anomaly（SSTA） numerical simulation comparison analysis |
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