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Full catalog/TRPSCROHM3D
TRPSCROHM3D·v1·dataset

Where the air's main cleanser (OH) sits, month by month (3D)

TROPESS Chemical Reanalysis OH Monthly 3-dimensional Product V1 (TRPSCROHM3D) at GES DISC
atmosphere NASA GES_DISC Level 4 active
In plain English

What it measures. Monthly amounts of the hydroxyl radical (OH), a short-lived molecule often called the atmosphere's 'detergent' because it breaks down many pollutants. Concentrations are given at many heights through the lower atmosphere.

How it's made. It comes from a computer reanalysis (TCR-2) that blends measurements from several satellites with a chemistry model to estimate OH levels for 2005 through 2021.

How & where you'd use it. Researchers use it to understand how quickly the atmosphere cleans itself of gases like methane and air pollutants, and to track changes in that cleansing power over time.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › HYDROGEN COMPOUNDS › HYDROXYL

Coverage & cadence

  • Time span2005-01-01 → ongoing
  • Measured byREANALYSIS MODELS (NOT APPLICABLE)
  • Processing levelLevel 4
  • Spatial extent-180, -90, 180, 90
  • StatusCOMPLETE

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 Chemical Reanalysis OH Monthly 3-dimensional Product contains vertical concentrations of the hydroxyl radical. The data are part of the Tropospheric Chemical Reanalysis v2 (TCR-2) for the period 2005-2021. TCR-2 uses JPL's Multi-mOdel Multi-cOnstituent Chemical (MOMO-Chem) data assimilation framework that simultaneously optimizes both concentrations and emissions of multiple species from multiple satellite sensors. The data files are written in the netCDF version 4 file format, and each file contains a year of data at monthly resolution, and a spatial resolution of 1.125 x 1.125 degrees at 27 pressure levels between 1000 and 60 hPa. The principal investigator for the TCR-2 data is Miyazaki, Kazuyuki.

Get the data

trpscrohm3d_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TRPSCROHM3D",
    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.