Cloud amounts and radiative fluxes calculated from the JMA atmospheric model

研究概要:The Japan Meteorological Agency global atmospheric model (version JMA-GSM9603) was run for a 45-month period. Cloud amounts and radiative fluxes obtained for this particular run are examined and compared with observational and other data. It is found that the amount of shortwave radiation reaching the surface is generally much lower than that from satellite-derived data, especially in the low latitudes of the Pacific region. This is in contrast to clear-sky conditions where the model and observational downward shortwave radiative fluxes agree well over much of the oceans. In this case, large differences are confined to parts of the continents, suggesting that some land-related factors need to be considered carefully, in addition to cloud estimation. Cloud cover, which is diagnosed from relative humidity, is calculated by a mixture of both maximum and random overlapping. The exact dependency of the cloud amounts on the relative humidity is varied and several runs are performed until there is a suitable match between the cloud amounts from the model and from ISCCP data. Resulting radiative fluxes are then compared again.

https://opac.ll.chiba-u.jp/da/curator/900022189/

https://opac.ll.chiba-u.jp/da/curator/900022189/C-17_23.pdf

千葉大学環境リモートセンシング研究センター

研究報告書

プロシーディング「雲のリモートセンシングと気候影響に関するシンポジウム」

130

135

1998

publisher