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자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences 한국기상학회지 제40권 제2호
발행연도
2004.4
수록면
101 - 117 (17page)

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초록· 키워드

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Tropical Rainfall Measuring Mission (TRMM) observations of radiometer brightness temperature (Tb) and radar reflectivity (Z) have been analyzed together with simulation, in order to explain the connection between microwave radiative transfer and vertical profiles of hydrometeors over tropical land and ocean. Vertical profiles of the reflectivity by Precipitation Radar (PR) were used as an input for the stratiform rain model, developed in this study. Then simulated temperatures of corresponding three TMI channels (19, 37, 85 ㎓) were compared with TMI Tb observations. In particular, radiative transfer simulations of microwave brightness temperature have been performed in order to show its sensitivity to particle size distribution (PSD; N<SUP>*</SUP>, μ) and surface emissivity (ε). The brightness temperature at 85 ㎓ (i.e., T85) was enhanced as particle size of hydrometeors increased over land and ocean. However, T19 and T37 were decreased over the ocean under the condition of the same particle size. Also, the simulated Tb values in case of Gamma distribution were higher than those of Marshall-Palmer distribution except for low frequency channels (i.e., 19 ㎓ and 37 ㎓) over the ocean. The Tb sensitivity to N* and μ was strong at 85 ㎓, but weak at 19 ㎓ and 37 ㎓. On the other hand, there was a distinct difference in brightness temperature over between land and ocean at low frequency, but not at 85 ㎓. The phenomenon is due to high intensity upwelling from the atmospheric lower layers and surface.

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Abstract
1. 서론
2. 자료 및 방법
3. TMI 세 채널 밝기온도에 대한 시뮬레이션
4. 결론
감사
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