The Chicago Water Isotope Spectrometer (ChiWIS) is an in situ integrated cavity output spectrometer (ICOS) operated by the University of Chicago. It measures water vapor (H2O) and semi-heavy water (HDO) in the dry upper troposphere and lower stratosphere (UTLS). It operates at the 2.647 μm wavelength and has an effective path length of 7.5 km. ChiWIS has a time resolution of 5 seconds, resulting in a spatial resolution of 1 km for aircraft speeds of 200 meters per second. ChiWIS has a precision of 3.6 ppbv for H2O and 82 pptv for HDO.
Instrument Details
- Spectrometer/Radiometer
- Earth Science > Atmosphere > Atmospheric Water VaporEarth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor Indicators > Water Vapor
- Lower Stratosphere, Troposphere
- 5 s
- 1 km
- 113.3 THz
- Currently unavailble
Liz Moyer
Benjamin Clouser
University of Chicago
Currently unavailable
Unpublished
 NASA WB-57 15 Campaigns · 76 Instruments |  Asian Summer Monsoon Chemical & Climate Impact Project 2022 West Pacific, South Korea 1 Deployment · 8 Data Products
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