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A new version of the High-Resolution Infrared Radiation Sounder (HIRS) uppertropospheric water vapor channel (channel 12) brightness temperature datasetis developed using intersatellite calibrated data. In this dataset, onlythose pixels affected by upper tropospheric clouds are discarded. Comparedto the previous version that was based on column-clear-sky data, the newversion has much better daily spatial coverage. TheHIRS observation patterns are compared to microwave sounder measurements.The differences between the two types of sounders vary with respect tobrightness temperature with larger differences for higher (dry) values.Correlations between the HIRS upper tropospheric water vapor channelbrightness temperatures and several major climate indices show strongsignals during cold seasons. The selected climate indices track climatevariation signals covering regions from the tropics to the poles.Qualitatively, moist signals are correlated with troughs and ascendingbranches of the circulation, while dry signals occur with ridges anddescent. These correlations show the potential of using the uppertropospheric water vapor channel brightness temperature dataset togetherwith a suite of many atmospheric variables to monitor regional climatechanges and locate global teleconnection patterns

HIRS channel 12 brightness temperature dataset and its correlations with major climate indices