| 夏季南亚高压的一组环流指数及其初步分析 |
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| 引用本文： | 陈延聪,王盘兴,周国华,李丽平,王蕊,施宁.夏季南亚高压的一组环流指数及其初步分析[J].南京气象学院学报,2009,32(6):832-838. |
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| 作者姓名： | 陈延聪 王盘兴 周国华 李丽平 王蕊 施宁 |
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| 作者单位： | 南京信息工程大学,大气科学学院,江苏,南京,210044 |
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| 基金项目： | 国家自然科学基金重点资助项目，江苏省研究生培养创新项目 |
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| 摘 要： | 用NCEP／NCAR100hPa月平均位势高度场再分析资料定义了6、7、8月逐月南亚高压的面积（S）、强度（P）、中心位置（λc，φc）3种环流指数，求出了它们1948-2007年的60a序列。用它们对夏季南亚高压气候及异常特征作了初步分析，结果表明：（1）南亚高压6月气候强度最弱、面积最小，中心位于尼泊尔西南边界；7月最强、最大，中心位于巴基斯坦北部；8月较7月略减弱、减小，但较6月强、大，中心位于印度北部。（2）南亚高压各月强度、面积异常作年际准同步变化，故异常分析中P′可代表S′；P′有季内一致性，同年6、7、8月P′同号率达41／60。（3）南亚高压6、7、8月强度的慢变分量小波功率谱在20世纪70年代末前后均通过d=0.05的显著性检验，故P′存在显著年代际变化。（4）南亚高压历年各月的中心位置分布区域作准纬向分布，其经（纬）向延伸范围与该月气候强度成正（反）比；中心位置异常存在明显的年代际变化特征。
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| 关 键 词： | 夏季 南亚高压环流指数 面积 强度 中心位置 |
A Set of Circulation Indices for Summer South Asian High and Their Preliminary Analyses |
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| CHEN Yan-cong,WANG Pan-xing,ZHOU Guo-hua,LI Li-ping,WANG Rui,SHI Ning.A Set of Circulation Indices for Summer South Asian High and Their Preliminary Analyses[J].Journal of Nanjing Institute of Meteorology,2009,32(6):832-838. |
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| Authors: | CHEN Yan-cong WANG Pan-xing ZHOU Guo-hua LI Li-ping WANG Rui SHI Ning |
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| Institution: | (School of Atmospheric Sciences,NUIST,Nanjing 210044,China) |
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| Abstract: | Based on the monthly mean geopotential height at 100 hPa of the NCEP/NCAR reanalysis data,three circulation indices are defined for South Asian High(SAH) in June,July and August,which are area index S,intensity index P and center location index(λ_c,φ_c).The three time series from 1948 to 2007 are calculated,which are used to study the climatic and anomalous characteristics of SAH in summer.The results show that:(1)SAH is the weakest with minimum area,and its center is located in the southwest border of Nepal in June.It is the strongest with maximum area,and its center is located in the northern of Pakistan in July.It is weaker and smaller in August than that in July,but stronger and bigger than that in June,and its center is located in the northern of India.(2)S′(area index anomaly) can be replaced with P′(intensity index anomaly) in the anomaly analysis due to the interannual quasi-synchronized variations of the intensity and area anomalies for SAH in each month.P′ of June,July and August have an intraseasonal consistency,and their same sign ratio reaches 41/60 in the same year.(3)The wavelet power spectrums of slowly varying components of SAH intensity in June,July and August all pass the statistical test at 0.05 significance level in the late 1970s or so,thus P′ of June,July and August have significant interdecadal variations.(4)The center locations of SAH in June,July and August from 1948 to 2007 show quasi-latitudinal distributions with apparent features of interdecadal abnormal variations,and their longitudinal(latitudinal) extended areas are proportional(inversely proportional) to the climatological intensity. |
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| Keywords: | summer circulation indices of south Asian high area intensity center location |
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