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南亚高压的东西偏向对亚洲季风区对流层顶附近水汽分布的影响

屠厚旺 田红瑛 梅成红 王文澜 张如华 雒佳丽

屠厚旺, 田红瑛, 梅成红, 王文澜, 张如华, 雒佳丽. 南亚高压的东西偏向对亚洲季风区对流层顶附近水汽分布的影响[J]. 气候与环境研究, 2018, 23(3): 341-354. doi: 10.3878/j.issn.1006-9585.2017.17048
引用本文: 屠厚旺, 田红瑛, 梅成红, 王文澜, 张如华, 雒佳丽. 南亚高压的东西偏向对亚洲季风区对流层顶附近水汽分布的影响[J]. 气候与环境研究, 2018, 23(3): 341-354. doi: 10.3878/j.issn.1006-9585.2017.17048
Houwang TU, Hongying TIAN, Chenghong MEI, Wenlan WANG, Ruhua ZHANG, Jiali LUO. Impact of the East-West Phase of South Asia High on Water Vapor Distribution near Tropopause over the Asian Monsoon Region[J]. Climatic and Environmental Research, 2018, 23(3): 341-354. doi: 10.3878/j.issn.1006-9585.2017.17048
Citation: Houwang TU, Hongying TIAN, Chenghong MEI, Wenlan WANG, Ruhua ZHANG, Jiali LUO. Impact of the East-West Phase of South Asia High on Water Vapor Distribution near Tropopause over the Asian Monsoon Region[J]. Climatic and Environmental Research, 2018, 23(3): 341-354. doi: 10.3878/j.issn.1006-9585.2017.17048

南亚高压的东西偏向对亚洲季风区对流层顶附近水汽分布的影响

doi: 10.3878/j.issn.1006-9585.2017.17048
基金项目: 

国家自然科学基金项目 41405041

国家自然科学基金项目 41630421

中央高校基本科研业务费专项资金 lzujbky-2017-73

详细信息
    作者简介:

    屠厚旺, 男, 1996年出生, 学士, 主要从事平流层对流层物质交换研究。E-mail:tuhouwang96@qq.com

    通讯作者:

    田红瑛, E-mail:tianhy@lzu.edu.cn

  • 中图分类号: P426.4.2

Impact of the East-West Phase of South Asia High on Water Vapor Distribution near Tropopause over the Asian Monsoon Region

Funds: 

National Natural Science Foundation of China (NSFC) 41405041

National Natural Science Foundation of China (NSFC) 41630421

the Fundamental Research Funds for the Central Universities lzujbky-2017-73

  • 摘要: 基于1958~2002年欧洲中期数值预报中心(ECMWF)提供的ERA-40再分析资料和美国气象环境预报中心/美国国家大气研究中心提供的NCEP/NCAR再分析资料研究了夏季南亚高压的东西偏向与亚洲季风区对流层顶附近水汽输送之间的关系。结果表明:(1)南亚高压的东西偏向对上对流层200 hPa水汽高值中心的位置影响较小,主要影响其强度,对100 hPa水汽高值中心的位置和强度有着较强的影响,而对平流层下部70 hPa的水汽分布几乎没有影响。(2)南亚高压偏东年,高原上空和高原南部的垂直上升运动较强,在西风急流的共同作用下可将低层丰富的水汽向上输送,使200 hPa和100 hPa的水汽高值中心位于高原上空,而100 hPa南亚高压范围内偏北风和偏东风增强,在水平输送的作用下使高值中心周围水汽的分布形态与高压中心的分布形态一致。(3)南亚高压偏西年,沿着高原西部的地形抬升作用比高原上空的对流上升运动更强,西风急流北移,对流层顶附近在60°E~80°E范围内形成气旋式环流,因此水汽高值中心向西偏移到伊朗高原。(4)南亚高压范围内200 hPa的温度异常分布与水汽的异常分布一致,暖中心有利于高水汽的生成。而100 hPa的温度异常分布与水汽异常分布相反,暖中心对应异常偏低的水汽,说明南亚高压范围内下平流层的水汽分布受环流场和温度场共同作用的影响。该研究对理解南亚高压东西偏向机制及提高亚洲气候预测有一定的参考意义。
  • 图  1  (a)1958~2002年南亚高压东西偏向标准化指数的时间演变;南亚高压(b)异常偏东年和(c)异常偏西年夏季200 hPa位势高度场合成

    Figure  1.  (a) Time series of the SAHI (South Asia High Index) from 1958 to 2002; composites of the geopotential height at 200 hPa in summer during the years with (b) the east phase and (c) the west phase of the SAH (South Asia High)

    图  2  夏季200 hPa(a、b)平均水汽比湿场和(c、d)水汽比湿距平场合成:(a、c)南亚高压偏东年;(b、d)南亚高压偏西年

    Figure  2.  Composites of (a, b) specific humidity and (c, d) anomalies of specific humidity at 200 hPa: (a, c) Years with the east phase of the SAH; (b, d) years with the west phase of the SAH

    图  3  夏季100 hPa(a、b)平均水汽比湿场和(c,d)水汽比湿距平场合成:(a、c)南亚高压偏东年;(b、d)南亚高压偏西年

    Figure  3.  Composites of (a, b) specific humidity and (c, d) anomalies of specific humidity at 100 hPa: (a, c) Years with the east phase of the SAH; (b, d) years with the west phase of the SAH

    图  4  夏季70 hPa(a、b)平均水汽比湿场和(c、d)水汽比湿距平场合成:(a、c)南亚高压偏东年;(b、d)南亚高压偏西年

    Figure  4.  Composites of (a, b) specific humidity and (c, d) anomalies of specific humidity at 70 hPa: (a, c) Years with the east phase of the SAH; (b, d) years with the west phase of the SAH

    图  5  100 hPa环流场(箭头)和垂直速度异常合成(填色):(a)南亚高压偏东年;(b)南亚高压偏西年;(c)南亚高压偏东年与偏西年的差值

    Figure  5.  Composites of abnormal wind (arrows) and vertical velocity (shadings) at 100 hPa: (a) Years with the east phase of SAH; (b) years with the west phase of SAH; (c) differences between the years with the east phase and west phase of SAH

    图  6  图 5,但为200 hPa环流场和垂直速度异常合成

    Figure  6.  Same as Fig. 5, but for the abnormal wind and vertical velocity at 200 hPa

    图  7  图 5,但为500 hPa环流场和垂直速度异常合成

    Figure  7.  Same as Fig. 5, but for abnormal wind and vertical velocity at 500 hPa

    图  8  南亚高压(a)偏东年(沿90°E)和(b)偏西年(沿62.5°E)的水汽比湿(填色)、风场(矢量箭头,水平风速单位:m/s,垂直风速单位:-10-2 Pa/s)和纬向风(白色等值线,单位:m/s)合成的经向—垂直剖面

    Figure  8.  Composites of vertical–meridional cross sections of specific humidity (shadings), vertical circulation (arrows, horizontal wind units: m/s, vertical wind units: -10-2 Pa/s), and zonal wind (white isolines, units: m/s) in years with (a) the east phase (along 90°E) and (b) the west phase (along 62.5°E) of the SAH

    图  9  南亚高压(a)偏东年(沿27.5°N)和(b)偏西年(沿30°N)的水汽比湿(填色)、风场(矢量箭头,水平风速单位:m/s,垂直风速单位:−10-2 Pa/s)和经向风(白色等值线,单位:m/s)合成的纬向—垂直剖面

    Figure  9.  Composites of height–latitude cross sections of specific humidity (shadings), vertical circulation (arrows, horizontal wind units: m/s, vertical wind units:−10-2 Pa/s), and meridional wind (white isolines, units: m/s) in years with (a) the east phase (along 27.5°N) and (b) the west phase (along 30°N) of the SAH

    图  10  夏季200 hPa(a、b)平均温度场和(c、d)温度距平场合成:(a、c)南亚高压偏东年;(b、d)南亚高压偏西年

    Figure  10.  Composites of (a, b) temperature and (c, d) anomalies of temperature at 200 hPa: (a, c) Years with the east phase of SAH; (b, d) years with the west phase of SAH

    图  11  夏季100 hPa(a、b)平均温度场和(c、d)温度距平场合成:(a、c)南亚高压偏东年;(b、d)南亚高压偏西年

    Figure  11.  Composites of (a, b) temperature and (c, d) anomalies of temperature at 200 hPa: (a, c) Years with the east phase of SAH; (b, d) years with the west phase of SAH

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  • 收稿日期:  2017-03-21
  • 网络出版日期:  2017-10-10
  • 刊出日期:  2018-05-20

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