Vol.21, NO.6, 2010
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Liao Rongwei, Zhao Ping. Climate characteristics of moisture budget in humid region affected by East Asian monsoon. J Appl Meteor Sci, 2010, 21(6): 649-658.
Citation: Liao Rongwei, Zhao Ping. Climate characteristics of moisture budget in humid region affected by East Asian monsoon. J Appl Meteor Sci, 2010, 21(6): 649-658.
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Climate Characteristics of Moisture Budget in Humid Region Affected by East Asian Monsoon

  • 1.

    Chinese Academy of Meteorological Sciences, Beijing 100081

  • 2.

    Graduate University of Chinese Academy of Sciences, Beijing 100049

  • 3.

    National Meteorological Information Centrr, Beijing 100081

  • 4.

    State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

  • Received Date: 2010-03-29
  • Rev Recd Date: 2010-10-08
  • Publish Date: 2010-12-31
    Abstract
  • Based on 1958—2007 NCEP/NCAR reanalysis data, the characteristics of moisture budget in humid region affected by East Asian Monsoon are calculated by moisture transport, moisture flux divergence and P-E methods. The correlation coefficients of climatological variability calculated by these methods are 0.91, 0.71, 0.81, and the percentage of ε are 17.4%, 44.1% and 44%. The results calculated by moisture transport and moisture flux divergence methods are nearly the same. The results reveal net income of moisture budget thoughout the year especially in spring and summer, while in winter and autumn it's relatively weaker. Using moisture flux divergence and P-E methods, the absolute errors in summer are larger than in other seasons. In spring and summer, water transport and moisture flux divergence are both stronger than those in autumn and winter. For the meridional moisture transport, moisture enters this area mainly from south boundary. For the zonal moisture transport, moisture enters through west boundary and departs from east boundary all the year. Overall, the period of positive moisture budget is from February to October calculated by moisture transport method, and from February to September by the other two methods. Vertical distribution of moisture budget is calculated by moisture transport method and moisture flux divergence method. It shows that the anomaly transport between 800—500 hPa is positive during 1960s and early 1970s and negative after that. Below 800 hPa, the values manifest negative before 1960s, and then turn to positive. There is net income of moisture at the whole layer except for the 850 hPa. By moisture flux divergence method, the calculated moisture convergence is positive above 450 hPa, and negative below. The interannual moisture budget variability of four seasons is quite obvious.
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    References(31)

  • Fig. 1  Humid region affected by East Asian Monsoon

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    Fig. 2  Climatic distribution of the annual average moisture transport in humid region affected by East Asian Monsoon from 1958 to 2007(unit: kg • s-1 • m-1, the value of moisture transport flux in shadow area exceeds 100 kg • s-1 • m-1)

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    Fig. 3  The climatological average zonal and meridional cycle of moisture budget in humid region affected by East Asian Monsoon from 1958 to 2007

    (a) from the west boundary, (b) from the east boundary, (c) the zonal net budget anomaly, (d) from the south boundary, (e) from the north boundary, (f) the meridional net budget anomal

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    Fig. 4  The climatological cycle of the moisture budget anomaly calculated by the moisture transport, moisture llux divergence and P-E motheds in humid region affected by East Asian Monsoon averaged from 1958 to 2007

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    Fig. 5  The time-zone distribution and time-meridian distribution of moisture transport under the climatic mean state in humid region affected by East Asian

    Monsoon from 1958 to 2007 (the value of shadow area exceeds 100kg·s-1·m-1) (a) B boundary, (b) D boundary, (c) F boundary, (d) A boundary, (e) C boundary, (f) E boundary

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    Fig. 6  The interannual change of the vertical distribution of moisture budget anomaly calculated by moisture transport method in humid region affected by East Asian Monsoon from 1958 to 2007(unit:104 m3·s-1) (the value of heavy shadow area exceeds1×104 m3·s-1, the light shadow area is below-1×104 m3·s-1)

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    Fig. 7  The vertical distribution of climatological mean moisture budgetcalculated by moisture transport method under the climatic mean state inhumid region affected by East Asian Monsoon from 1958 to 2007

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    Fig. 8  The interannual changes of moisture budget anomaly calculated by the moisture transport, moisture flux divergence and P~E methods in humid region affected by East Asian Monsoon from 1958 to 2007 (a) annual budget, (b) spring, (c) summer, (d) autumn, (d) winter

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    Table  1  The seasonal variability of moisture budget calculated by moisture transport in humid region affected by East Asian Monsoon from 1958

    Table  2  The seasonal variability and absolute error of themoisture budget calculated by and in humid region affected by East Asian Monsoonfrom 1958 to 2007 (unit:104 m3 • s-1)
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    • Received : 2010-03-29
    • Accepted : 2010-10-08
    • Published : 2010-12-31
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