Grant-in-Aid for international Scientific Research
|Allocation Type||Single-year Grants|
|Research Institution||Nagoya University|
TAKEDA Takao Water Research Institute, Nagoya University, 水圏科学研究所, 教授 (60022604)
甄 進明 北京大学, 地球物理系, 助教
張 呈祥 北京大学, 地球物理系, 講師
DU Jinlin Department of Geophysics, Beijing University, 地球物理系, 講師
胡 成達 北京大学, 地球物理系, 副教授
趙 柏林 北京大学, 地球物理系, 教授
MITSUTA Yasushi Disaster Prevention Research Institute, Kyoto University, 防災研究所, 教授 (90027219)
TANAKA Masayuki Research Center for Atmospheric and Oceanic Variations, Faculty of Science, Toho, 理学部, 教授 (90004340)
ASAI Tomio Ocean Research Institute, The University of Tokyo, 海洋研究所, 教授 (80025288)
KATO Kuranoshin Water Research Institute, Nagoya University, 水圏科学研究所, 助手 (90191981)
ISHIZAKA Yutaka Water Research Institute, Nagoya University, 水圏科学研究所, 助教授 (50022710)
ZHEN Jinmin Department of Geophysics, Beijing University
ZHANG Chengxiang Department of Geophysics, Beijing University
HU Chengda Department of Geophysics, Beijing University
ZHAO Bolin Department of Geophysics, Beijing University
|Project Period (FY)
1989 – 1990
Completed(Fiscal Year 1990)
|Budget Amount *help
¥6,000,000 (Direct Cost : ¥6,000,000)
Fiscal Year 1990 : ¥3,000,000 (Direct Cost : ¥3,000,000)
Fiscal Year 1989 : ¥3,000,000 (Direct Cost : ¥3,000,000)
|Keywords||Distribution of low-level clouds / Vertical structure of cloud capped and heat budget / Southwest Islands area (winter) / Cold air outbreak over warm sea / Numerical modeling of low-level cloud layer / Airmass transformation and heat budget / Airmass transformation and cloud parameter / 04Cloud water amount observed by microwave radiometer|
In order to understand the characteristics of the low-level clouds and their heat budgets in winter over the warm sea around the East China Sea and the Southwest-Islands areas, the cooperative observational study was performed between Japan and China.
1. In January 1990 and 1991 the cooperative observations between Japan and China performed on the Amamiohshima (an island) simultaneously with the special observations by using the aircrafts on the "Western North-Pacific Cloud-Radiation Experiment" of WCRP. Especially in January 1991 the three microwave radiometers (6-channel, 54.4-60GH_z), 2-channel (52.9-54.5GH_z), and 2-channel (22.235 and 35.3GH_z) of Beijing University, the doppler-sodar etc. of the Japanese side are operated on that island for examinations on the structure of cloud layer and subcloud layer, together with NOAA AVHRR data and GMS data received at Nagoya University, and MOS-1, -1b data.
2. Comparative observation of the microwave radiometer of the Beijing University and
the Nagoya University was made at Shionomisaki in Japan before that observation (February 1989) and their data were relatively in good agreement with each other.
3. The Japanese scientists visited Beijing University every year from 1989 to 1990 for the discussions on the observational research plans and so on. On the other hand, the meeting was held in every year after the cooperative observations in Japan.
4. The improvements of the observation and the analysis systems of the doppler-sodar have enabled us to continue the observation even in weak rain situation.
5. The characteristics of the distribution of low-level clouds showed rather different features associated with the variation of large-scale atmospheric conditions (different types of cold air outbreak situations) and the sea surface temperature, i. e., the shallow convective clouds and the stratiform clouds. According to the detailed case study based on the NOAA AVHRR data the size of the clouds are rather smaller even at the downstream side in the northern area of East China Sea than around the Southwest-Islands area.
6. The numerical models are developed in order to understand the formation processes of these different types of clouds including the large-scale subsidence, heat and moisture exchanges at the sea surface and their vertical transfer, with special attention to the processes around the cloud top. The numerical study for the clouds around this area suggests that the cloud top process which affects greatly the heat and moisture exchange at the sea surface in some cases. Less