Article
Analyses of the Global bias between MODIS infrared and AMSR-E microwave SSTs
In preparation
(2018)
Abstract
Temporal and spatial variations of the bias and standard deviation of the Advanced Microwave Scanning Radiometer - EOS (AMSR-E) Level-2 (L2) sea surface temperature (SST) fields relative to L2 MODerate-resolution Imaging Spectroradiometer (MODIS) SST fields have been determined for a long term co-located data sets. MODIS SST observations were co-located at full AMSR-E grid resolution and analyzed as a function of space and time. After pre-processing of the individual satellite data, the highest quality L2 MODIS SST s at 1 km resolution were averaged to the 56 km AMSR-E footprint for comparisonwith co-located rain-free AMSR-E SST s. Daytime and nighttime fields were analyzed separately. The best agreement occurred for nighttime fields. Biases found in the daytime fields are thought to result from diurnal warming caused by solar heating. Under the clear-sky conditions, themean biaseswere found to be 0.03 C and 0.05 C and standard deviations to be 0.43 C and 0.48 C for nighttime and daytime, respectively. Of particular interest is the significant increase both in the bias and the standard deviation as cloud fraction in the MODIS fields increased. This it thought to result from cloud contaminated MODIS pixels being misclassified as clear – this analysis was performed using only the ‘best’ MODIS values; i.e., pixels not meeting this criterion were not used in the calculations. However, it is also possible that the AMSR-E retrieval algorithm introduces these errors as part of the retrieval process.
Keywords
- SST
Disciplines
Publication Date
2018
Citation Information
Brahim Boussidi, Peter Cornillon, Gavino Puggioni, Chelle Gentemann, et al.. "Analyses of the Global bias between MODIS infrared and AMSR-E microwave SSTs" In preparation (2018) Available at: http://works.bepress.com/peter-cornillon/5/