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An updated trmm composite climatology of tropical rainfall and its validation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Huffman, George Adler, Robert F. Bolvin, David Wang, Jian-Jian |
| Copyright Year | 2013 |
| Description | An updated 15-yr Tropical Rainfall Measuring Mission (TRMM) composite climatology (TCC) is presented and evaluated. This climatology is based on a combination of individual rainfall estimates made with data from the primaryTRMMinstruments: theTRMM Microwave Imager (TMI) and the precipitation radar (PR). This combination climatology of passive microwave retrievals, radar-based retrievals, and an algorithm using both instruments simultaneously provides a consensus TRMM-based estimate of mean precipitation. The dispersion of the three estimates, as indicated by the standard deviation sigma among the estimates, is presented as a measure of confidence in the final estimate and as an estimate of the uncertainty thereof. The procedures utilized by the compositing technique, including adjustments and quality-control measures, are described. The results give a mean value of the TCC of 4.3mm day(exp -1) for the deep tropical ocean beltbetween 10 deg N and 10 deg S, with lower values outside that band. In general, the TCC values confirm ocean estimates from the Global Precipitation Climatology Project (GPCP) analysis, which is based on passive microwave results adjusted for sampling by infrared-based estimates. The pattern of uncertainty estimates shown by sigma is seen to be useful to indicate variations in confidence. Examples include differences between the eastern and western portions of the Pacific Ocean and high values in coastal and mountainous areas. Comparison of the TCC values (and the input products) to gauge analyses over land indicates the value of the radar-based estimates (small biases) and the limitations of the passive microwave algorithm (relatively large biases). Comparison with surface gauge information from western Pacific Ocean atolls shows a negative bias (~16%) for all the TRMM products, although the representativeness of the atoll gauges of open-ocean rainfall is still in question. |
| File Size | 2193307 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150000213 |
| Archival Resource Key | ark:/13960/t2d84b179 |
| Language | English |
| Publisher Date | 2013-08-20 |
| Access Restriction | Open |
| Subject Keyword | (gpcp) Global Precipitation Project Analysis Tmi (trmm Microwave Imager) (pr) Precipitation Radar Tcc (trmm Composite Climatology) Trmm Climatology Meteorological Radar Microwave Transmission Estimating Trmm Satellite Data Reduction Radar Transmission Tropical Regions Rain Hydrological Cycle Algorithms Precipitation Measurement Microwave Imagery Data Retrieval Standard Deviation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
