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Full catalog/TRPSYL2HDOCRS1FS
TRPSYL2HDOCRS1FS·v1·dataset

Heavy water vapor in the air, summary (NOAA-20)

TROPESS CrIS-JPSS1 L2 Deuterated Water Vapor for Forward Stream, Summary Product V1 (TRPSYL2HDOCRS1FS) at GES DISC
atmosphere NASA GES_DISC Level 2 active
In plain English

What it measures. How much 'heavy' water vapor (a rarer form of water made with deuterium) is present at different heights in the atmosphere, in a condensed summary form, with uncertainties.

How it's made. Retrieved from infrared measurements by the CrIS instrument on the NOAA-20 satellite using a NASA estimation method, gridded at about 14 km across 17 vertical levels.

How & where you'd use it. Useful for tracing where atmospheric moisture comes from and how the water cycle works, since the heavy form behaves slightly differently from ordinary water vapor.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › HYDROGEN COMPOUNDS › HYDROGEN-DEUTERIUM OXIDE

Coverage & cadence

  • Time span2021-02-01 → ongoing
  • Measured byJPSS-1 (CrIS)
  • Processing levelLevel 2
  • Spatial extent-180, -90, 180, 90
  • StatusACTIVE

What you can do with it

  • Map air pollutants — NO₂, aerosols, ozone
  • Track greenhouse gases and Earth's energy budget
  • Feed weather and air-quality analysis
Official description

The TROPESS CrIS-JPSS1 L2 Deuterated Water Vapor for Forward Stream, Summary Product contains the vertical distribution of the retrieved atmospheric state of semi-heavy water (HDO), and formal uncertainties measured by the CrIS instrument on the JPSS-1 (NOAA-20) satellite. The forward stream standard product is global for the time period from 2021-04-01 to present. The NASA TRopospheric Ozone and Precursors from Earth System Sounding (TROPESS) project, uses an optimal estimation algorithm, known as the MUlti-SpEctra, MUlti-SpEcies, Multi-SEnsors (MUSES). The data files are written in the netCDF version 4 file format, and each file contains one day of data. The data have a spatial resolution of 14 km (CrIS nadir FOV), and are reported at 17 vertical levels from the surface to 0.1 hPa. The principal investigator for the TROPESS project is Kevin W. Bowman.

Get the data

trpsyl2hdocrs1fs_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TRPSYL2HDOCRS1FS",
    version="1",
    bounding_box=(-122.5, 37.2, -121.8, 37.9),  # your area (W,S,E,N)
    temporal=("2024-01-01", "2024-12-31"),       # your dates
)
files = earthaccess.open(results)   # stream straight from GES_DISC
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.