2003 Fiscal Year Final Research Report Summary
Development of an Algorithm for Precipitation over the Global Land by Using Space-based Microwave Radiometer
| Project/Area Number |
14350263
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水工水理学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KOIKE Toshio The University of Tokyo, Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (30178173)
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| Co-Investigator(Kenkyū-buntansha) |
HAGINOYA Shigenori Japan Meteorological Agency, Meteorological Research Institute, Chief researcher, 物理気象研究部, 主任研究官
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| Project Period (FY) |
2002 – 2003
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| Keywords | Remote sensing / Precipitation / Space-based observation / Water cycle / Microwave / Microwave radiometer |
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| Research Abstract |
This research targeted to develop bases for development of an algorithm for precipitation over the global land by using space-based microwave radiometers.
To monitor the land. surface emissivity and land land surface temperature as the boundary conditions of the radiative transfer model in atmosphere effectively, an algorithm for the Advanced Microwave Scanning Radiometers (AMSR & AMSR-E) launched in 2002 was developed in this research. A physically based radiative transfer model was developed by considering the effects of extinction in soil layer and absorption and radiation in vegetation layer at first. Then, a retrieval algorithm by using the satellite sensor data. A good accuracy of the algorithm is obtained through the algorithm validation in the Mongolia reference site of the Coordinated Enhanced Observation Project (CEOP). Consequently, a soil moisture data set is generated in Mongolia by applying the algorithm to the AMSR-E.
As the second step, an algorithm for retrieval of the atmospheric parameters 'integrated cloud liquid water content' and 'snow rate' was developed using a microwave radiative transfer model and its application to experiment data obtained during the AMSR/AMSR-E validation campaign in Fukui in January 2003. Starting from the insights gathered from the separation of the four components of radiative transfer, further calculations were carried out, in order to obtain relations between the brightness temperatures at different frequencies -which are either in use on current satellite platforms or were used during the Fukui-experiment -and the atmospheric parameters to be observed. Based on these results, a basic algorithm was developed and applied to experiment data. The comparison with ground based gauge data shows good agreement for some cases while there seems to be no correlation between the two methods in others.
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Research Products
(14 results)
