Abstracts for the 5th International GAME Conf.
3-5 October 2001
Aichi Trade Center
Nagoya Japan
Estimating upper tropospheric water vapor from SSM/T-2 measurements: Examination of water vapor greenhouse effect.
B. J. Sohn (1), Eui-Seok Chung (1), Johannes Schmetz (3), Eric A. Smith (4)
(1) Seoul National University, Korea
(3) EUMETSAT, Germany
(4) NASA/GSFC, USA
We develop an algorithm for estimating water vapor profiles under clear or moderate cloudy-sky conditions, using microwave radiometric measurements from Special Sensor Microwave Temperature-2 (SSM/T2). A combined statistical predictor matrix and physical relaxation approach is used for the water vapor retrieval in the upper troposphere.
Retrieved precipitable waters at four different atmospheric layers are compared with those from radiosonde observations. Results indicated that layer precipitable water in the upper troposphere is in good agreement with radiosonde observations, with rms error of 0.68 kgm-2 and near zero bias. The results suggest that the retrieved water vapor information can be used for better understanding the role of water vapor in modulating the radiation budget and thus global climate.
The implications of variations in upper tropospheric water vapor (UTW) are examined by comparing with CERES earth radiation budget data. It is shown that clear-sky outgoing longwave radiation appears to be largely controlled by UTW through a dominant contribution to now-wind OLR, in particular over the tropics. For a given change of UTW, however, drier subtropical region seems to be more susceptible to the greenhouse effect, suggesting the importance of UTW transport from moist tropical region to dry subtropical region.
Submittal Information
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School of Earth and Environmental Sciences, Seoul National University | |
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Shilim Dong, Kwanak Gu, Seoul, 151-747 | |
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