Identification of mesoscale convection and thunderstorms by space platform data
The production potential of MODIS (Moderate Resolution Imaging Spectro-radiometer) for definition of the degree of instability of the atmosphere is investigated. Spectroradiometer MODIS is installed on the space platform Terra for studying the atmosphere of the Earth and its surface on 36 channels. Numerous parameters have been developed to measure convective instability, which are defined according to aerologic sounding. The more common ones include the Lifted Index (LIFT) and two indexes (TOTL and K Index) containing static stability and dew point at levels of 850 hPa and 700 hPa. Indexes are calculated on the basis of the data of aerologic sounding of the atmosphere. The MODIS Atmospheric Profile product (MOD07) consists of several parameters including atmospheric stability, temperature and moisture profiles, and atmospheric water vapor. All of these parameters are produced for 20 levels at 5 x 5 km pixel resolution including indexes Lifted Index, TOTL and K Index. As the characteristic of instability three indexes computed on radiosonde and satellite data are compared: Lifted Index, TOTL and K Index. Characteristics of the atmosphere for days with thunderstorms at a Western Siberia station for the period of 2009-2011 were investigated. The total of 76 days with thunderstorm during the researched period have been considered. The statistical calculations and figures showing comparison between indexes derived from the atmospheric sounding and satellite data are presented. Two of the satellite derived instability indexes (Lifted Index, TOTL) are well correlated with those derived from radiosondes. Figures showing spatial distribution of indexes during a thunder-storm at one of the meteorological stations are given. Taking into account the fact that spatial resolution MYD07_L2 is 5 х 5 km, the probability of thunderstorm activity, which is directly connected with atmospheric instability, can be defined for each cell of the grid. MODIS allows determining spatial position of powerful convective cells and improving the forecast of thunderstorms. The researches play an important role as they have a high potential for increase in spatial accuracy of thunder-storms forecasting.
Keywords
гроза,
неустойчивость атмосферы,
спектрорадиометр MODIS,
thunderstorms,
instability of atmosphere,
Spectroradiometer MODISAuthors
| Gorbatenko Valentina P. | National Research Tomsk State University | vpgor@tpu.ru |
| Krechetova Svetlana Yu. | Gorno-Altaisk State University | krechetovas@yandex.ru |
| Belikova Marina Yu. | Gorno-Altaisk State University | belikovamy@yandex.ru |
| Razumova Olga V. | National Research Tomsk State University | helgarazumova@gmail.com |
Всего: 4
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