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Titolo:
Evaluation of PERSIANN system satellite-based estimates of tropical rainfall
Autore:
Sorooshian, S; Hsu, KL; Gao, X; Gupta, HV; Imam, B; Braithwaite, D;
Indirizzi:
Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA Univ Arizona Tucson AZ USA 85721 & Water Resources, Tucson, AZ 85721 USA
Titolo Testata:
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
fascicolo: 9, volume: 81, anno: 2000,
pagine: 2035 - 2046
SICI:
0003-0007(200009)81:9<2035:EOPSSE>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECIPITATION CLIMATOLOGY PROJECT; NEURAL-NETWORK; GLOBAL PRECIPITATION; GAUGE OBSERVATIONS; PASSIVE MICROWAVE; CLOUD; CLASSIFICATION; ALGORITHM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Sorooshian, S Univ Arizona, Dept Hydrol & Water Resources, Bldg 11,POB 210011, Tucson, AZ 85721 USA Univ Arizona Bldg 11,POB 210011 Tucson AZ USA 85721 5721 USA
Citazione:
S. Sorooshian et al., "Evaluation of PERSIANN system satellite-based estimates of tropical rainfall", B AM METEOR, 81(9), 2000, pp. 2035-2046

Abstract

PERSIANN, an automated system for Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks, has been developed for the estimation of rainfall from geosynchronous satellite longwave infared imagery (GOES-IR) at a resolution of 0.25 degrees x 0.25 degrees everp half-hour. The accuracy of the rainfall product is improved by adaptively adjusting the network parameters using the instantaneous rain-rate estimates fromthe Tropical Rainfall Measurement Mission (TRMM) microwave imager (TMI product 2A12), and the random errors are further reduced by accumulation to a resolution of 1 degrees x 1 degrees daily. The authors' current GOES-IR-TRMM TMI based product, named PERSIANN-GT, was evaluated over the region 30 degrees S-30 degrees N, 90 degrees E-30 degrees W, which includes the tropical Pacific Ocean and parts of Asia, Australia, and the Americas. The resulting rain-rate estimates agree well with the National Climatic Data Center radar-gauge composite data over Florida and Texas (correlation coefficient rho > 0.7). The product also compares well (rho similar to 0.77-0.90) with the monthly World Meteorological Organization gauge measurements for 5 " x 5 " grid locations having high gauge densities. The PERSIANN-GT product was evaluated further by comparing it with current TRMM products (3A11, 3B31, 3B42, 3B43) over the entire study region. The estimates compare well with theTRMM 3B43 1 degrees x 1 degrees monthly product, but the PERSIANN-GT products indicate higher rainfall over the western Pacific Ocean when compared to the adjusted geosynchronous precipitation index-based TRMM 3B42 product.

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Documento generato il 30/11/20 alle ore 00:49:35