Development of an Algorithm for Precipitation over the Global Land by Using Space-based Microwave Radiometer

利用天基微波辐射计开发全球陆地降水算法

• 批准号: 14350263
• 负责人: KOIKE Toshio
• 金额: $ 9.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350263/
• 关键词: Remote sensing; Precipitation; Space-based observation; Water cycle; Microwave; Microwave radiometer

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.

这项研究的目标是为使用天基微波辐射计制定全球陆地降水量算法奠定基础。利用地表比辐射率和地表温度作为大气辐射传输模型的边界条件，提出了一种适用于2002年发射的先进微波扫描辐射计（AMSR & AMSR-E）的计算方法。首先建立了一个基于物理的辐射传输模型，该模型考虑了土壤层的消光效应和植被层的吸收辐射效应。然后，提出了一种利用卫星传感器数据进行反演的算法。通过对协调增强观测项目（CEOP）蒙古参考站的算法验证，获得了较好的精度。因此，土壤水分数据集产生在蒙古通过应用该算法的AMSR-E。作为第二步，大气参数“综合云液态水含量”和“雪率”的反演算法开发使用微波辐射传输模型和其应用程序的AMSR/AMSR-E验证活动期间获得的实验数据在福井在2003年1月。从分离辐射传输的四个组成部分收集的见解开始，进行了进一步的计算，以获得不同频率下的亮度温度（无论是在当前的卫星平台上使用还是在福井实验期间使用）与待观察的大气参数之间的关系。在此基础上，提出了一种基本的算法，并将其应用于实验数据。与地面测量数据的比较表明，在某些情况下，两种方法之间似乎没有相关性。

项目成果

Yang, K., T.Koike, H.Fujii, K.Tamagawa, N.Hirose: "Improvement of Surface Flux Parameterizations with a Turbulence-Related Length"Quarterly journal of the Royal Meteorological Society. Part B・No.584. 2073-2088 (2002)

Yang, K., T.Koike, H.Fujii, K.Tamakawa, N.Hirose：“通过与湍流相关的长度改进表面通量参数化”英国皇家气象学会季刊 B·No.584。 -2088 (2002)

M.Pathmathevan, T.Koike, X.Li: "A New Satellite Based Data Assimilation Algorithm to Determine Spatial and Temporal Variations of Soil Moisture and Temperature Profiles"Journal of the Meteorological Society of Japan. 81・5. 1111-1135 (2003)

M.Pathmathevan、T.Koike、X.Li：“一种新的基于卫星的数据同化算法，用于确定土壤湿度和温度剖面的空间和时间变化”日本气象学会杂志 81・5（2003 年）。 ）

T.Graf., T.Koike, K.Nishimura: "Correcting Solid Precipitation Data From Gauge Observations Using Passive Microwave Brightness Temperature Data."水工学論文集. 48・2. 259-264 (2004)

T.Graf.、T.Koike、K.Nishimura：“使用被动微波亮度温度数据校正测量观测中的固体降水数据”，水利工程学杂志 48・2（2004 年）。

T.Graf., T.Koike, K.Nishimura: "Correcting Solid Precipitation Data From Gauge Observations Using Passive Microwave Brightness Temperature Data"Annual Journal of Hydraulic Engineering, JSCE. Vol.48・No.2. 259-264 (2004)

T.Graf.、T.Koike、K.Nishimura：“使用被动微波亮度温度数据校正来自仪表观测的固体降水数据”水利工程学报，第 48 卷·第 2 期（2004 年）。

Hirose, N, T.Koike, H, Ishidaira: "Study on Spatially averaged Evaporation under Soil Moisture Heterogeneity Affected by Permafrost Micro-topography"Journal of Meteorological Society Japan. Vol.80・No.2. 191-203 (2002)

Hirose，N，T.Koike，H，Ishidaira：“永久冻土微地形影响下的土壤水分异质性的空间平均蒸发研究”日本气象学会杂志第80卷·第203期（2002年）。