Wind fields and upper tropospheric humidity from satellite images in the 6.3 μm band

Physics

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Scientific paper

This paper presents results of a pilot study investigating the relationship between the monthly mean fields of wind and humidity in the upper troposphere. The wind fields are derived from successive METEOSAT images in the water vapour channel (WV: 5.7 - 7.1 μm). The upper tropospheric relative humidity (UTH) is inferred from water vapour brightness temperatures with a modified regression scheme that explicitly considers temperature lapse rate. Quantitative information on the large scale circulation in the upper troposphere can be derived from WV wind fields. The monthly mean wind field of January 1992 is used to estimate the large scale divergence, which ranges between about - 8. 10^-6 s^-1 and 8. 10^-6 s^-1 on a scale of about 1500 km. The spatial pattern of the UTH field closely resembles the divergence of the wind field suggesting that UTH is principally determined by large scale circulation. Implications for weather prediction and climate modeling are discussed.

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