2009 Fiscal Year Final Research Report
Multi-Parameter Radar Observation on the Formation Mechanism of Solid Precipitation Particles in a Broad Cloud Band Developed over the Sea of Japan in Winter
| Project/Area Number |
20740271
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Meteorology/Physical oceanography/Hydrology
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
OHIGASHI Tadayasu Nagoya University, 地球水循環研究センター, 特任助教 (80464155)
|
|---|
| Project Period (FY) |
2008 – 2009
|
| Keywords | 固体降水 / マルチパラメーターレーダー / 偏波レーダー / 日本海 / 帯状降雪雲 / 豪雪・大雪 / 粒子識別法 |
|---|
| Research Abstract |
A broad cloud band developed over the Sea of Japan is one of the cloud systems causing active snowfall during cold air outbreaks. This cloud band concentrates precipitation and occasionally causes a heavy snowfall. In this study, we conducted an observation using multi-parameter (polarimetric-Doppler) radar. A method identifying a main hydrometeor category from the radar data was developed and occurrence frequency for each hydrometeor type was examined. Appling the method to the case for a cloud band occurring during the observation period, the graupel type accounted for 30 to 40% of the total precipitation time. The snow aggregates type, which was the primary one, was about 50% of the total time.
|
