Počet záznamů: 1
Combined assimilation of screen-level observations and radar-derived precipitation for soil moisture analysis
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SYSNO ASEP 0360677 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Combined assimilation of screen-level observations and radar-derived precipitation for soil moisture analysis Tvůrce(i) Mahfouf, J. - F. (FR)
Bližňák, Vojtěch (UFA-U) RID, ORCIDZdroj.dok. Quarterly Journal of the Royal Meteorological Society. - : Wiley - ISSN 0035-9009
Roč. 137, č. 656 (2011), s. 709-722Poč.str. 14 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova data assimilation ; weather prediction ; land surface schemes Vědní obor RIV DG - Vědy o atmosféře, meteorologie CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000290450900011 DOI 10.1002/qj.791 Anotace A methodology is proposed in order to combine information from radar precipitation with other observations (e.g. screen-level temperature and relative humidity) in a soil analysis scheme based on an extended Kalman filter. The study is performed over the Czech Republic for one month in July 2008 using three-hour rainfall accumulations derived from two radars and a land-surface scheme. The Jacobian matrix of the observation operator is examined to make optimal choices for the estimation of the Kalman gain matrix. Too small values lead to unphysical negative elements whereas too large values reduce the spatial variability considerably. After a log-transform of the precipitation field, the errors are more compatible with the Gaussian hypothesis of the Kalman filter. Two methods for combining the assimilation of screen-level observations with radar precipitation are compared. An evaluation shows more accurate soil analyses when both sources of information are considered to correct soil moisture contents. Pracoviště Ústav fyziky atmosféry Kontakt Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Rok sběru 2012 Elektronická adresa http://onlinelibrary.wiley.com/doi/10.1002/qj.791/abstract
Počet záznamů: 1