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Quantifying uncertainties in land surface microwave emissivity retrievals
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Harrison, Kenneth W. Boukabara, Sid-Ahmed Aires, Filipe Prigent, Catherine Peters-Lidard, Christa D. Norouzi, Hamidreza Tian, Yudong Furuzawa, Fumie A. Masunaga, Hirohiko |
| Copyright Year | 2012 |
| Description | Uncertainties in the retrievals of microwave land surface emissivities were quantified over two types of land surfaces: desert and tropical rainforest. Retrievals from satellite-based microwave imagers, including SSM/I, TMI and AMSR-E, were studied. Our results show that there are considerable differences between the retrievals from different sensors and from different groups over these two land surface types. In addition, the mean emissivity values show different spectral behavior across the frequencies. With the true emissivity assumed largely constant over both of the two sites throughout the study period, the differences are largely attributed to the systematic and random errors in the retrievals. Generally these retrievals tend to agree better at lower frequencies than at higher ones, with systematic differences ranging 1~4% (3~12 K) over desert and 1~7% (3~20 K) over rainforest. The random errors within each retrieval dataset are in the range of 0.5~2% (2~6 K). In particular, at 85.0/89.0 GHz, there are very large differences between the different retrieval datasets, and within each retrieval dataset itself. Further investigation reveals that these differences are mostly likely caused by rain/cloud contamination, which can lead to random errors up to 10~17 K under the most severe conditions. |
| File Size | 1595192 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120010535 |
| Archival Resource Key | ark:/13960/t8gf5sv4c |
| Language | English |
| Publisher Date | 2012-01-01 |
| Access Restriction | Open |
| Subject Keyword | Earth Resources And Remote Sensing Microwave Radiometers Cloud Cover Rain Emissivity Systematic Errors Brightness Temperature Deserts Earth Surface Random Errors Rain Forests Remote Sensing Microwave Emission Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
