CrIS Calibration

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The Cross-track Infrared Sounder (CrIS)

CrIS is a hyperspectral Fourier Transform Spectrometer that measures top-of-atmosphere high spectral resolution infrared radiance spectra. CrIS is manifested/planned as a series of five advanced operational sounder instruments onboard the SNPP and JPSS satellites that provide more accurate, detailed atmospheric temperature and moisture observations for weather and climate applications. This information significantly improves climate prediction and both short-term weather "nowcasting" and longer-term forecasting.

Mission:

High vertical resolution Temperature and Water Vapor profiles. Coarse profile and total column of trace gases (CO₂, CH₄, CO).

Satellites:

SNPP (2011), NOAA-20 (2017), JPSS-2 (2022)

Instrument Type:

Fourier Transform Spectrometer

Channels:

2211 (Hamming 3-point apodized) when operating at Full Spectral Resolution (FSR).
2223 (unapodized)

Spectral resolution:

0.625 cm^-1 (unapodized) at FSR

Spectral range (cm^-1):

650-1095, 1210-1750, 2155–2550

Horizontal resolution:

14 km per field-of-view (FOV) and 48 km per Field of Regard (FOR) at nadir.

Scanning Technique:

Cross-track with 30 steps per scan.

Swath width:

2200 km

Coverage/Cycle:

Near-global coverage twice per day.