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季风湿润区夏季水汽收支的年代际变化特征

廖荣伟 赵平

廖荣伟, 赵平. 季风湿润区夏季水汽收支的年代际变化特征. 应用气象学报, 2013, 24(1): 12-22..
引用本文: 廖荣伟, 赵平. 季风湿润区夏季水汽收支的年代际变化特征. 应用气象学报, 2013, 24(1): 12-22.
Liao Rongwei, Zhao Ping. Inter-decadal variations of summer water budgets in the monsoon wetness region of Eastern China. J Appl Meteor Sci, 2013, 24(1): 12-22.
Citation: Liao Rongwei, Zhao Ping. Inter-decadal variations of summer water budgets in the monsoon wetness region of Eastern China. J Appl Meteor Sci, 2013, 24(1): 12-22.

季风湿润区夏季水汽收支的年代际变化特征

资助项目: 

国家重点基础研究发展计划项目 2009CB421404

详细信息
    通信作者:

    赵平, email: zhaoping@cams.cma.gov.cn

Inter-decadal Variations of Summer Water Budgets in the Monsoon Wetness Region of Eastern China

  • 摘要: 采用1983—2002年NCEP/NCAR再分析资料和我国660站降水资料,对我国东部季风湿润区夏季水汽收支变化与大气环流和我国降水异常特征的关系进行研究。结果表明:20世纪80—90年代夏季水汽收支时间序列表现出明显的年代际变化增加趋势,与降水时间序列的相关系数为0.71;水汽收支高值、低值年代不仅能够指示季风湿润区经向风的异常变化,还能够指示东亚夏季风的强弱和降水异常变化。合成的水汽输送年代际异常在东亚—西太平洋区表现为4个异常环流,异常水汽通量辐合区位于长江流域及以南地区。水汽收支高值年代,亚洲大陆高纬度地区低压偏弱,大陆表面温度及西太平洋海温偏高,我国东部沿海盛行异常偏南风,低层气流辐合、高层气流辐散强,垂直上升运动强烈;低值年代则相反。合成的经向水汽收支占总收支的71.3%,合成的异常降水量最大达100 mm以上。
  • 图  1  我国东部季风湿润区 (矩形框所示)[34]

    Fig. 1  The monsoon wetness region in Eastern China (rectangle)[34]

    图  2  1983—2002年季风湿润区夏季标准化水汽收支和区域平均降水的时间序列

    (点线为在1983—1992年和1993—2002年平均的标准化降水)(a) 以及水汽收支的M-K检验统计量曲线 (直线为达到0.001显著性水平线)(b)

    Fig. 2  The normalized temporal curves of the water budgets and regional mean rainfall in the monsoon wetness region during summer from 1983 to 2002

    (the dotted line represents the averages of the standardized precipitation over 1983—1992 and 1993—2002, respectively)(a) and the statistic curve of the M-K test for water budgets (the straight line represents the 0.001 level)(b)

    图  3  夏季季风湿润区水汽收支高值、低值年代合成降水量及夏季季风湿润区降水与整层水汽通量散度相关分布

    (阴影区表示达到0.1显著性水平) (a) 降水量差值 (高值减低值;单位:mm),(b)1983—2002年降水量标准差 (单位:mm),(c) 降水量与整层水汽通量散度相关分布

    Fig. 3  Composite difference of summer precipitation between high and low value decades of water budgets and the correlations between regional mean precipitation and the divergence of vertically integrated water vapor flux in the monsoon wetness region

    (the shaded denotes passing test of 0.1 level)(a) the composite difference of summer precipitation (high minus low; unit: mm), (b) the standard deviation of summer precipitation during 1983—2002(unit: mm), (c) correlations between regional mean precipitationand the divergence of vertically integrated water vapor flux

    图  4  夏季季风湿润区水汽收支高值和低值年代合成的整层水汽通量和水汽通量散度差值 (阴影区表示达到0.1显著性水平)

    (a) 水汽通量 (单位:kg·m-1·s-1), (b) 水汽通量散度 (单位:mm·d-1)

    Fig. 4  Composite difference of vertically integrated water vapor flux and its convergence between high and low value decades of water budget in the monsoon wetness region (the shaded denotes passing the test of 0.1 level)

    (a) water vapor flux (unit: kg·m-1·s-1), (b) divergence of water vapor flux (unit: mm·d-1)

    图  5  夏季季风湿润区水汽收支高值和低值年代合成的表面气温差值 (单位:℃)(a)、表面气压 (等值线,单位:hPa) 及风场 (矢量) 差值 (b)、海表温度差值 (单位:℃)(c)(阴影区表示达到0.1显著性水平; 粗虚线为1500 m高度)

    Fig. 5  Composite difference of summer surface temperature monsoon wetness region (unit: ℃)(a), the surface pressure (isoline, unit:hPa) and wind (vector)(b) and SST (unit:℃)(c) (the shaded denotes passing the test of 0.1 level; the thick dashed line denotes the height of 1500 m)

    图  6  夏季季风湿润区水汽收支高值和低值年代合成的100 hPa风场 (单位:m·s-1)(a)、300 hPa辐散场 (单位:107s-1)(b)、500 hPa位势高度场 (单位:gpm)(c) 和850 hPa风场 (单位:m·s-1)(d) 的差值分布

    (阴影区表示达到0.1显著性水平;黑色区域表示地形)

    Fig. 6  Composite difference of summer wind at 100 hPa (unit: m·s-1)(a), wind divergence at 300 hPa (unit:107s-1)(b), geopotential height at 500 hPa (unit: gpm)(c) and wind at 850 hPa (unit: m·s-1)(d) in the monsoon wetness region

    (the shaded denotes passing the test of 0.1 level; the black area denotes terrain)

    图  7  夏季季风湿润区水汽收支高和低值年代合成的300 hPa (单位:10-6kg·m-2·s-1)(a)、850 hPa (b) 水汽通量散度差值分布 (单位:10-5kg·m-2·s-1)、300 hPa (c)、850 hPa (d) 假相当位温差值分布 (单位:K)(阴影区表示达到0.1显著性水平; 黑色区域表示地形)

    Fig. 7  Composite difference of summer water vapor flux divergence at 300 hPa (unit: 10-6kg·m-2·s-1)(a) and 850 hPa (b)(unit: 10-5kg·m-2·s-1), pseudo-equivalent temperature (unit: K) at 300 hPa (c) and 850 hPa (d)(unit: K) in the monsoon wetness region (the shaded denotes passing the test of 0.1 level; the black area denotes terrain)

    图  8  夏季季风湿润区水汽收支高值和低值年代合成的22°~30°N平均 (a)、110°~120°E平均 (b) 的垂直环流 (矢量; u,v单位:m·s-1w单位:10-2 Pa·s-1w扩大2倍) 和假相当位温 (等值线,单位:K) 差值分布

    (阴影区表示达到0.1显著性水平; 黑色区域表示地形)

    Fig. 8  Composite difference of summer 22°—30°N average (a) and 110°—120°E average (b) of vertical circulation (vector; unit of u, v: m·s-1; unit of w:10-2 Pa·s-1, w is expanded by 2 times) and pseudo-equivalent temperature (isoline, unit: K) in the monsoon wetness region

    (the shaded denotes passing the test of 0.1 level; the black area denotes terrain)

    表  1  我国东部季风湿润区夏季高值、低值年代水汽收支及区域平均降水量距平及其差值

    Table  1  Composite values of the summer water budgets and precipitation between high and low value decades in the monsoon wetness region of Eastern China with their differences

    距平 高值年代 低值年代 差值
    经向水汽收支
    /(104m3·s-1)
    5.8 -0.4 6.2
    纬向水汽收支
    /(104m3·s-1)
    -3.3 -0.8 -2.5
    水汽净收支
    /(104m3·s-1)
    2.5 -1.2 3.7
    降水量/mm 18.1 -14.4 32.5
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  • 收稿日期:  2012-06-13
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