%0 Journal Article
%T Comparing high-resolution gridded precipitation data with satellite rainfall estimates of TRMM_3B42 over Iran
%A S. Javanmard
%A A. Yatagai
%A M. I. Nodzu
%A J. BodaghJamali
%A H. Kawamoto
%J Advances in Geosciences (ADGEO)
%D 2010
%I Copernicus Publications
%X To evaluate satellite rainfall estimates of Tropical Rain Measurement Mission (TRMM) level 3 output (3B42) (TRMM_3B42) over Iran (20∼每45∼ N, 40∼每65∼ E), we compared these data with high-resolution gridded precipitation datasets (0.25∼℅0.25∼ latitude/longitude) based on rain gauges (Iran Synoptic gauges Version 0902 (IS0902)). Spatial distribution of mean annual and mean seasonal rainfall in both IS0902 and TRMM_3B42 from 1998 to 2006 shows two main rainfall patterns along the Caspian Sea and over the Zagros Mountains. Scatter plots of annual average rainfall from IS0902 versus TRMM_3B42 for each 0.25∼℅0.25∼ grid cell over the entire country (25∼每40∼ N, 45∼每60∼ E), along the Caspian Sea (35∼每40∼ N, 48∼每56∼ E), and over the Zagros Mountains (28∼每37∼ N, 46∼每55∼ E) were derived. For the entire country, the Caspian Sea region, and the Zagros Mountains, TRMM_3B42 underestimates mean annual precipitation by 0.17, 0.39, and 0.15 mm day 1, respectively, and the mean annual rainfall spatial correlation coefficients are 0.77, 0.57, and 0.75, respectively. The mean annual precipitation temporal correlation coefficient for IS0902 and TRMM_3B42 is ~0.8 in the area along the Zagros Mountains, and ~0.6 in the Caspian Sea and desert regions.
%U http://www.adv-geosci.net/25/119/2010/adgeo-25-119-2010.html