Skip to main content
U.S. flag

An official website of the United States government

IR Sounder Upper Tropospheric Humidity BT CDR

Configuration Item ID 01B-03

The Infrared Radiation (IR) Sounder Upper Tropospheric Humidity Brightness Temperature (BT) Climate Data Record (CDR) measures upper tropospheric humidity. High Resolution Infrared Radiation Sounder (HIRS) level-1b data, in conjunction with cloud-clearing, limb-correction, and inter-satellite calibration, provide the CDR input. The final record has global coverage at a 2.5°x2.5° spatial resolution and provides data from 1978–present.

To help the project receive continued support, updates, and improvement, tell us how you use IR Sounder Tropospheric Humidity BT CDR data by completing our optional User Registration Form.

Optional User Registration

Sample product image of NOAA CDR, IR Sounder Upper Tropospheric Humidity Brightness Temperatures. It depicts the tropospheric humidity, in Kelvin, across a Mercator map indicating higher levels of brightness across the central portions of the projection.

Principal Investigator



Cite dataset when used as a source. See the dataset's landing page for citation details at  doi:10.25921/mwe8-7e12

Data Access