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Seasonal Variation and Test of Qinghai-Tibetan Plateau Heating and Its Profile

NANJING UNIVERSITY OF INFORMATION SICENCE & TECHNOLOGY. Seasonal Variation and Test of Qinghai-Tibetan Plateau Heating and Its Profile. Zhong Shanshan , He Jinhai Key Laboratory of Meteorological Disasters of Jiangsu,Nanjing University of Information Science & Technology. Outlines.

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Seasonal Variation and Test of Qinghai-Tibetan Plateau Heating and Its Profile

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  1. NANJING UNIVERSITY OF INFORMATION SICENCE & TECHNOLOGY Seasonal Variation and Test of Qinghai-Tibetan Plateau Heating and Its Profile Zhong Shanshan , He Jinhai Key Laboratory of Meteorological Disasters of Jiangsu,Nanjing University of Information Science & Technology

  2. Outlines 1. Introduction 2. Data and Methodology 3. Seasonal Variation and Test of Tibetan Plateau Heating and Its Profile 4. Summary

  3. introduction 1 Qinghai-Tibetan Plateau (QTP) • height is the highest • acreage is the largest • surface feature is more complicated • exerts pronounced effects on atmospheric circulations and climate worldwide

  4. the QTP as a heat source is so great that it influences global atmospheric and oceanic circulations . (Krishnamurti T. N. et al., 1973; Ye D. Z. ,1998; Zhao P , 2000 ; Zhao P., 2001 ) • the strongest heat source Q1 in summer Asia is not over the QTP but in the northern Bay of Bengal and the South-China Sea – western Pacific. ( Chen L. X., W. L. Li, 1981) the QTP heating effect is pronounced. the QTP heating strength is not verypronounced.

  5. How reasonable ? • Howstrong ?

  6. Data and methodology • 1961-2001 ECMWF daily reanalysis data（ERA for short） • 1961-2001 NCEP/NCAR daily reanalysis data • 1979-2001 daily OLR ( Outgoing Longwave Radiation) • 1979-2001 GPCP(Global Precipitation Climatology Project) • 1998-2006 monthly 3A12 data obtained from TRMM µwave Imager (TMI) ：1.surface rain; 2.latent heat • 1979-2001 monthly precipitation form 231 station in China (included 71station on tibetan plateau) • Jun 4th-14th in 1998，relative humidity from the radiosonde data at Anduo were obtained by GAME/Tibet project

  7. atmospheric heating source (Yanai, et al.,1992 ) : . Vertical integration

  8. Seasonal variation and test of Qinghai-Tibetan plateau heating and its profile

  9. Summer (ERA) Summer (NCEP) Distribution of the 23-yr mean (1979-2001) vertically integrated heat source in summer by (a) ERA; (b) NCEP I

  10. Summer (GPCP) Summer (3A12 ) Summer (OLR) Summer Observed Rain （a） 1979～2001 GPCP（b） 1998～2006 rain of 3A12 （c） 1979～2001 OLR（d） 1979-2001 precipitation in China

  11. Jan ERA Jan NCEP Monthly mean <Q1> distribution in horizontal over the QTP. (Units: W/m2 ) Apr ERA Apr NCEP Jul ERA Jul NCEP left： ERA right：NCEP Oct ERA Oct NCEP

  12. ERA NCEP Regional averaged monthly <Q1> (W/m2) over the QTP in 1979-2001

  13. ERA NCEP Mean heating rate at≥3000m level over the QTP during 1979-2001（Units：℃/day）

  14. Mar Apr May Jun NCEP ERA Jul Aug Sep The vertical profile of monthly mean Q1 at ≥ 3000 m level over the QTP from March to September in 1979-2001 (℃/day)

  15. Mar Apr May Jun Latent heat Jul Aug Sep Monthly mean Latent heat profile of 3A12 at ≥ 3000 m level over the QTP from March to September in 1998-2006 (℃/day)

  16. Relative humidity latent heat June 4th -14th 1998, Anduo’s vertical profile of left: heating rate Middle: relative humidity Right: latent heat

  17. The location of Anduo : 91°.06′E，32°.21′N，4801m)

  18. Comparison of relative humidity with heating rate of Anduo during June 7th-9th 1998 L.RH（%）; M.ERA（℃/d）; R.NCEP（℃/d ）

  19. Comparison of relative humidity with heating rate of Anduo on June 10th and12th 1998 a、RH（%）; b、ERA（℃/d）; c、NCEP（℃/d ）

  20. ERA 600hPa 500hPa 400hPa 600hPa 500hPa The distribution of maximum heating level over Qinghai-Tibetan Plateau and its nearby regions in June during 1979-2001

  21. The distribution of heating rate on the maximum heating level in June (℃/day)

  22. summary • As far as the calculated heat sources are concerned, NCEP- and ERA- based summer thermal sources clearly show the surface heavy rainfall centers of the Asian monsoon region. As a result, the findings are rational for the data used. • For the two kinds of reanalysis data, their vertical profiles are similar during the period from March to September. However, the ERA is superior to NCEP , which is tested by the radiosonde data at Plateau station.

  23. The thickness and intensity of heat source over the plateau change with season. The heating rate of the plateau which is comparable to the Bay of Bengal’s, is remarkable at the maximum heat source layer.

  24. Aknowledgement • The radiosonde data at Anduo were obtained by GAME/Tibet project, which was GAME-Tibet project supported by the MEXT, FRSGC, NASDA of Japan, Chinese Academy of Science, and Asian Pacific Network.

  25. Thanks!

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