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Full catalog/TRPSDL2NH3CRS1FS
TRPSDL2NH3CRS1FS·v1·dataset

Ammonia gas in the air (JPSS-1)

TROPESS CrIS-JPSS1 L2 Ammonia for Forward Stream, Standard Product V1 (TRPSDL2NH3CRS1FS) at GES DISC
atmosphere NASA GES_DISC Level 2 active
In plain English

What it measures. How ammonia gas is distributed through the vertical layers of the atmosphere, along with uncertainty estimates and quality information, reported from the surface up to high altitude.

How it's made. Retrieved from infrared measurements by the CrIS instrument on the JPSS-1 (NOAA-20) satellite, using a multi-sensor estimation method, with one file per day at about 14 km resolution.

How & where you'd use it. Useful for studying air quality and pollution, since ammonia comes from sources like agriculture and contributes to fine-particle haze.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › NITROGEN COMPOUNDS › AMMONIA

Coverage & cadence

  • Time span2021-04-01 → 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 Ammonia for Forward Stream, Standard Product contains the vertical distribution of the retrieved atmospheric state of ammonia (NH3), formal uncertainties, and diagnostic information 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 15 vertical levels from the surface to 0.1 hPa. The principal investigator for the TROPESS project is Kevin W. Bowman.

Get the data

trpsdl2nh3crs1fs_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TRPSDL2NH3CRS1FS",
    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.