Zou: NESDIS/STAR SNO-calibrated MSU/AMSU Radiances
A reader points out the SNO corrected data for MSU/AMSU middle troposphere. The following is “version 2.0”
NESDIS/STAR SNO-calibrated MSU/AMSU Radiances
There are Release Notes.
This release note describes the basic characteristics of the NESDIS/STAR MSU/AMSU long-term climate data records (CDR), which include fundamental radiance CDRs (FCDR) calibrated using simultaneous nadir overpass (SNO) method, and the deep-layer atmospheric temperature thematic CDRs (TCDRs) developed from the SNO-calibrated radiance FCDRs.
Merging methods for V1.2 and V2.0 TCDRs are similar, which is summarized as follows: first derive gridded dataset from SNO-recalibrated, diurnal drift and incident angle corrected radiances; then Christy empirical approach is used to remove residual sun heating related instrument signals at the gridded product level after the SNO calibration. Target factors determined from ocean-mean data were applied globally; Finally, a grid-cell dependent constant bias correction was applied to remove lat/lon-dependent residual intersatellite biases before the merging.
Figure 1 MSU channel 2 and AMSU channel 5 inter-satellite difference time series for TIROS-N through NOAA-18 and MetOp-A of the global land (upper panel) and oceanic (lower panel) atmospheric temperatures for different calibration and merging methodologies. The abbreviation “N11-N10” stands for NOAA-11 minus NOAA-10, and so on. Unit in Kevin.