Vol.22, NO.1, 2011
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Zhang Bo, Zhong Shanshan, Zhao Bin, et al. The influence of the subtropical sea surface temperature over the Western Pacific on spring persistent rains. J Appl Meteor Sci, 2011, 22(1): 57-65.
Citation: Zhang Bo, Zhong Shanshan, Zhao Bin, et al. The influence of the subtropical sea surface temperature over the Western Pacific on spring persistent rains. J Appl Meteor Sci, 2011, 22(1): 57-65.
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The Influence of the Subtropical Sea Surface Temperature over the Western Pacific on Spring Persistent Rains

  • 1.

    National Meteorological Center, Beijing 100081

  • 2.

    School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044

  • 3.

    Chinese Academy of Meteorological Sciences, Beijing 100081

  • Received Date: 2010-02-04
  • Rev Recd Date: 2010-10-19
  • Publish Date: 2011-02-28
    Abstract
  • Using the Community Atmospheric Model Version 3.1 (CAM3.1) provided by National Center for Atmospheric Research (NCAR), the influence of the East Asian subtropical zonal land-sea thermal difference on the spring persistent rains is studied. The results show that the monthly sea surface temperature over the western Pacific (15°—35°N, 120°—150°E) are two months ahead of schedule, the seasonal conversion of the East Asia—the western Pacific subtropical zonal land-sea thermal difference is delayed, and the thermal difference between the East Asia and the western Pacific in spring is decreased. Under this condition, the intensity of the southwest winds at 850 hPa over East China in March and April decreases, and the rainfall over the region to south of 30°N decreases during the period from March to April, the remarkable decreasing periods are mid-March and mid-late April. The result shows that the intensity of spring persistent rains decreases due to the little land-sea thermal difference. The important role of the East Asian subtropical zonal land-sea thermal difference on the spring persistent rains over Southeastern China is verified. As far as the mechanisms are concerned, the results are as follows.When the land-sea thermal difference of subtropical zonal is minished, the intensity of vortex over the southeastern Tibetan Plateau weakens and then the geopotential difference between this vortex and the western Pacific subtropical high minishes. The western Pacific subtropical high over the middle and low latitudes weakens, and the intensity of the southeast wind decreases over the region to north of the western Pacific subtropical high. Therefore, the southeast warm moist airflows decrease and the convergence intensity of the moisture flux divergence weakens. Under this general circulation conditions, there are no heavy spring persistent rains.
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    References(23)

  • Fig. 1  Zonal difference of 500 hPa temperature between WPSST and CTL (unit:℃)

    (a) departure between WPSST and CTL over 20°—30°N, (b) difference between regions of 20°—30°N, 80°—120°E and 20°—30°N, 120°—150°E

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    Fig. 2  Meridian-time cross section of precipitation intensity (unit:mm·d-1) (a) and wind fields at 850 hPa (vectors:wind direction; shaded areas:wind speed) (b) averaged over 110°—120°E

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    Fig. 3  Meridian-time cross section of precipitation intensity averaged over 110°—120°E (unit: mm·d-1) (a) CTL, (b) WPSST, (c) difference between WPSST and CTL

    (shaded areas: passing the test of 0.1 level)

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    Fig. 4  Meridian-time cross section of 850 hPa wind fields averaged over 110°—120°E in the east part of China (vectors:wind direction; shaded areas:wind speed) (a) CTL, (b) WPSST

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    Fig. 5  850 hPa mean geopotential height fields in March and April (unit: gpm) (dashed line: the topography of 1500 m)(a) CTL, (b) WPSST

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    Fig. 6  850 hPa mean wind fields in March and April

    (dashed line: the topography of 1500 m; shaded areas: passing the test of 0.05 level) (a) CTL, (b) WPSST, (c) difference between WPSST and CTL

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    Fig. 7  850 hPa mean moisture flux in March and April (unit: 10-5 g·kg-1·s) (dashed line: the topography of 1500 m; shaded areas: passing the test of 0.05 level)

    (a) CTL, (b) WPSST, (c) difference between WPSST and CTL

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    Fig. 8  Mean precipitation intensity in March and April (unit: mm·d-1) (dashed line: the topography of 1500 m; shaded areas: passing the test of 0.05 level) (a) CTL, (b) WPSST, (c) difference between WPSST and CTL

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    • Received : 2010-02-04
    • Accepted : 2010-10-19
    • Published : 2011-02-28
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