The availability of precipitable water retrieval using split-window data

[ABSTRACT] Water vapor is one of the most significant green house effect gases. A monitoring of water vapor behavior with operational satellite is important to investigate the global changes. Water vapor usually exists at lower troposphere. However, precipitable water is a key property to comprehend the variation since sometimes humid air mass moves to the upper troposphere. Using split window channel data with optical sensors such as AVHRR and VIS SR, several retrieval algorithm has been proposed and among them, transmittance ratio method has been often utilized. However, the approach is still controversial because some studies concluded it was available and others not. We investigated the availability of the method with split window channel's data of GMS-5/VISSR on a semi-continental scale. A calibration curve of precipitable water with radiosonde observation had been made in course of the retrieval procedure. However, the calibration curve are hardly sensitive to the precipitable water.Numerical simulations were carried out for the possible condition, and it turned out that calibration was insensitive to precipitable water under some condition at all:larger water water variation for a given surface temperature range within a given region. The results of a feasibility study will be discussed.

https://opac.ll.chiba-u.jp/da/curator/102645/

https://opac.ll.chiba-u.jp/da/curator/102645/BA64563608-5-P103.pdf

千葉大学環境リモートセンシング研究センター

Chiba University. Center for Environmental Remote Sensing

会議発表用資料

BA64563608

CEReS環境リモートセンシングシンポジウム資料集

5

103

111

2002-12-20

publisher

環境リモートセンシング研究センター「CEReSシンポジウム資料集」