9:00 AM - 9:15 AM
[ACG09-13] Creation of TRMM PR data by minimizing the effect of the PR hardware change
Keywords:TRMM, PR, Climate data
The observation of PR temporary stopped on May 29, 2009. The PR H/W changed from A-side to B-side and the B-side observation has started since June 19, 2009, which causes the drop of noise power. The difference in noise power between 2008 and 2010 is obtained as a decrease of 0.54 dBm. This change affects a minimum detection of weak rain by PR. In the current study, the B-side PR data are adjusted to simulate the data with the characteristics of A-side PR. The simulated data are created with the additional electric power of 0.54 dBm in level-1 PR power (1B21) product. The level-2 rainfall (2A25) product is produced from the 1B21 product via products of level-1 radar reflectivity (1C21), level-2 surface cross section (2A21), and rain characteristics (2A23). The simulated data are generated from June 2009 to December 2010 and quantitatively assessed for the PR H/W change.
The simulated data produce a decrease in rain frequency and tend to mitigate the discontinuity caused by the PR H/W change. Semi-global (35S-35N) precipitation amount derived from the simulated data in 2010 decreased by about 1 %, compared with the original data. Oceanic precipitation is uniformly decreased, while land precipitation regionally decreases and increases in spite of the decrease in rain frequency. Regional dependence of land precipitation change will be examined focusing on changes of path-integrated-attenuation and rain type classification.