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Full catalog/TRPSYL2NH3CRSRS
TRPSYL2NH3CRSRS·v1·dataset

Ammonia gas in the air (CrIS, Suomi-NPP)

TROPESS CrIS-SNPP L2 Ammonia for Reanalysis Stream, Summary Product V1 (TRPSYL2NH3CRSRS) at GES DISC
atmosphere NASA GES_DISC Level 2 active
In plain English

What it measures. How much ammonia gas is in the air and at what heights, across the globe. Ammonia comes largely from agriculture and affects air quality.

How it's made. Derived from infrared measurements by the CrIS instrument on the Suomi-NPP satellite, using an advanced method that fits the atmosphere's chemical state to the data.

How & where you'd use it. Helps researchers study air pollution, farming emissions, and how ammonia contributes to fine-particle haze, using a consistent global record from 2015 to 2023.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › NITROGEN COMPOUNDS › AMMONIA

Coverage & cadence

  • Time span2015-12-01 → ongoing
  • Measured bySuomi-NPP (CrIS)
  • Processing levelLevel 2
  • 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 CrIS-SNPP L2 Ammonia for Reanalysis Stream, Summary Product contains the vertical distribution of the retrieved atmospheric state of ammonia (NH3), and formal uncertainties measured by the CrIS instruments on the Suomi-NPP satellite. The reanalysis stream summary product is global for the time period from 2015-12-01 to 2023-05-18. 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

trpsyl2nh3crsrs_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TRPSYL2NH3CRSRS",
    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.