Seasonal and Diurnal Variations of Raindrop Size Distribution in Asian Monsoon Region(<Special Issue>CPEA-Coupling Processes in the Equatorial Atmosphere)

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  • KOZU Toshiaki
    Faculty of Science and Engineering, Shimane University, Matsue
  • REDDY K. Krishna
    Institute of Observational Research for Global Change (IORGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka
  • MORI Shuichi
    Institute of Observational Research for Global Change (IORGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka
  • THURAI Merhala
    Colorado State University
  • ONG J. Teong
    Nanyang Technological University, Singapore
  • RAO D. Narayana
    National Atmospheric Research Laboratory, India
  • SHIMOMAI Toyoshi
    Faculty of Science and Engineering, Shimane University, Matsue

書誌事項

タイトル別名
  • Seasonal and Diurnal Variations of Raindrop Size Distribution in Asian Monsoon Region
公開日
2006
DOI
  • 10.2151/jmsj.84a.195
公開者
公益社団法人 日本気象学会

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説明

Diurnal and seasonal variations of raindrop size distribution (DSD) at Gadanki (GD), Singapore (SG) and Kototabang (KT) are studied to elucidate characteristics of DSD in the Asian monsoon region. It is found that DSDs are affected by diurnal convective cycles and seasonal variations in precipitation characteristics. GD has the most significant seasonal variation in DSD. Clear difference in rainfall characteristics between the Southwest and Northeast monsoon seasons is considered to be the main cause of such clear seasonal variation. KT has the most significant diurnal variation of DSD, which is probably caused by the fact that KT is greatly affected by ocean-land contrast and mountain effects to generate local convection in the afternoon. SG has less diurnal and seasonal variations compared with the other two locations, which is related to the fact that SG is affected both by land and oceanic rainfall. Z-R relations applicable to radar rainfall measurement in these areas are derived. It is shown that the use of the Marshall-Palmer Z-R relation (Z = 200R1.6) gives bias errors of about 1.5 dB or less in rain rate estimation except for the northeast monsoon season in GD, for 12∼18 local time during pre-southwest monsoon season in GD, and for 06∼12 local time during some monsoon seasons in KT.

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