2011 Fiscal Year Final Research Report
Development of satellite precipitation maps for hydrologicalapplications
| Project/Area Number |
22760365
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Hydraulic engineering
|
|---|
| Research Institution | Nagasaki University (2011)
The University of Tokyo (2010) |
|---|
Principal Investigator |
SETO Shinta 長崎大学, 大学院・工学研究科, 准教授 (50533618)
|
|---|
| Project Period (FY) |
2010 – 2011
|
| Keywords | 水文学 |
|---|
| Research Abstract |
For further improvement of satellite precipitation maps such as GSMaP, we have conducted two studies in this project. Firstly, rain rate estimates in the new standard product of TRMM/PR (Version 7, V7) were evaluated. Owing to the improvement of surface reference technique, heavy rainfall estimates appear more frequently in V7 than in the previous version. We also evaluated V7’s rain rate estimates with high-temporal resolution rain gauge dataset over Japan and concluded that the heavy rainfall estimates (higher than 50 mm/h) are overestimated, but their biases are less than 50%. Secondly, we developed a new method to detect rainfall for the interval of two measurements of microwave radiometers. In this method, we judge rain or no-rain from the decrease in brightness temperature at low frequency channels. This method yields comparable results with the method used in GSMaP for less vegetated area.
|
