| MA Leiming,QIN Zenghao,DUAN Yihong,LIANG Xudong,WANG Dongliang. 2006. Impacts of TRMM SRR assimilation on the numerical prediction of tropical cyclone. Acta Oceanologica Sinica, (5):14－26 |
| Impacts of TRMM SRR assimilation on the numerical prediction of tropical cyclone |
| Impacts of TRMM SRR assimilation on the numerical prediction of tropical cyclone |
| Received:January 17, 2006 Revised:May 05, 2006 |
| DOI： |
| Key words:TRMM TC Danas 4DVAR rainfall numerical simulation |
| 中文关键词: TRMM TC Danas 4DVAR rainfall numerical simulation |
| 基金项目: |
| Author Name | Affiliation | E-mail | | MA Leiming | Laboratory of Typhoon Forecast Technique/China Meteorological Administration, Shanghai Typhoon Institute, Shanghai 200030, China
Department of Atmospheric Sciences, Nanjing University, Nanjing 210093, China | malm@mail.typhoon.gov.cn | | QIN Zenghao | Laboratory of Typhoon Forecast Technique/China Meteorological Administration, Shanghai Typhoon Institute, Shanghai 200030, China | | | DUAN Yihong | Laboratory of Typhoon Forecast Technique/China Meteorological Administration, Shanghai Typhoon Institute, Shanghai 200030, China | | | LIANG Xudong | Laboratory of Typhoon Forecast Technique/China Meteorological Administration, Shanghai Typhoon Institute, Shanghai 200030, China | | | WANG Dongliang | Laboratory of Typhoon Forecast Technique/China Meteorological Administration, Shanghai Typhoon Institute, Shanghai 200030, China | |
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| Abstract: |
| Impacts of the four-dimensional variation (4DVAR) assimilation of Tropical Rainfall Measuring Mission (TRMM)/TMI surface rainfall rate (SRR) on the initialization and simulation of TC Danas in 2001 are studied.A number of sensitivity experiments are designed to evaluate the performance of assimilation during the particular stage when Danas developed from a tropical depression towards a typhoon, as well as an abrupt turning.Under the dynamic and thermodynamic constraints of meso-scale model and the 4DVAR, the TRMM SRR data are directly assimilated in high horizontal resolution (18 km).On the basis of the adjustment of initial model field, 4DVAR of TRMM SRR considerably improved the depiction of TC's structure and rainfall.The same explanation can also be given to the enhancement of simulation on TC's intensity and track.In comparison with the popular idea of twice steps of SRR assimilation, namely, 4DVAR plus 1DVAR, the retrieval error is expected to be avoided in the procedure of direct 4DVAR.In addition, the TRMM SRR 4DVAR within a high-resolution model can take into account as much information as observed and is expected to be performed in operational use if the observed rainfall data are routinely available. |
| 中文摘要: |
| Impacts of the four-dimensional variation (4DVAR) assimilation of Tropical Rainfall Measuring Mission (TRMM)/TMI surface rainfall rate (SRR) on the initialization and simulation of TC Danas in 2001 are studied.A number of sensitivity experiments are designed to evaluate the performance of assimilation during the particular stage when Danas developed from a tropical depression towards a typhoon, as well as an abrupt turning.Under the dynamic and thermodynamic constraints of meso-scale model and the 4DVAR, the TRMM SRR data are directly assimilated in high horizontal resolution (18 km).On the basis of the adjustment of initial model field, 4DVAR of TRMM SRR considerably improved the depiction of TC's structure and rainfall.The same explanation can also be given to the enhancement of simulation on TC's intensity and track.In comparison with the popular idea of twice steps of SRR assimilation, namely, 4DVAR plus 1DVAR, the retrieval error is expected to be avoided in the procedure of direct 4DVAR.In addition, the TRMM SRR 4DVAR within a high-resolution model can take into account as much information as observed and is expected to be performed in operational use if the observed rainfall data are routinely available. |
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