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http://dx.doi.org/10.7780/kjrs.2006.22.6.469

Estimating Stability Indices from the MODIS Infrared Measurements over the Korean Peninsula  

Park, Sung-Hee (School of Earth and Environmental Sciences, Seoul National University)
Chung, Eui-Seok (School of Earth and Environmental Sciences, Seoul National University)
Koenig, Marianne (EUMETSAT, Darmstadt, Germany)
Sohn, B.J. (School of Earth and Environmental Sciences, Seoul National University)
Publication Information
Korean Journal of Remote Sensing / v.22, no.6, 2006 , pp. 469-483 More about this Journal
Abstract
An algorithm was developed to estimate stability indices (SI) over the Korean peninsula using Terra Moderate Resolution Imaging Spectroradiometer (MODIS) infrared brightness temperatures (TBs). The SI is defined as the stability of the atmosphere in the hydrostatic equilibrium with respect to the vertical displacements and is used as an index for the potential severe storm development. Using atmosphere temperature and moisture profiles from Regional Data Assimilation and Prediction System (RDAPS) as initial guess data for a nonlinear physical relaxation method, K index (KI), KO Index (KO), lifted index (LI), and maximum buoyancy (MB) were estimated. A fast radiative transfer model, RTTOV-7, is utilized for reducing the computational burden related to the physical relaxation method. The estimated TBs from the radiative transfer simulation are in good agreement with observed MODIS TBs. To test usefulness for the short-term forecast of severe storms, the algorithm is applied to the rapidly developed convective storms. Compared with the SIs from the RDAPS forecasts and NASA products, the MODIS SI obtained in this research predicts the instability better over the pre-convection areas. Thus, it is expected that the nowcasting and short-term forecast can be improved by utilizing the algorithms developed in this study.
Keywords
stability index; convective storm forecast; MODIS data;
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