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Full catalog/TRPSYL2PANCRSRS
TRPSYL2PANCRSRS·v1·dataset

Smog gas (PAN) in the air, reanalysis summary

TROPESS CrIS-SNPP L2 Peroxyacetyl Nitrate for Reanalysis Stream, Summary Product V1 (TRPSYL2PANCRSRS) at GES DISC
atmosphere NASA GES_DISC Level 2 active
In plain English

What it measures. Maps how much peroxyacetyl nitrate (PAN), a smog-related compound, is present in the air and at what altitudes, along with how confident the estimate is.

How it's made. A summary product built from infrared readings by the CrIS instrument on the Suomi-NPP satellite, run through a NASA estimation system for the years 2015 through 2023.

How & where you'd use it. Useful for studying air pollution and smog chemistry, since PAN forms downwind of pollution sources and helps trace how pollutants travel across regions.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › NITROGEN COMPOUNDS › PEROXYACETYL NITRATE

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 Peroxyacetyl Nitrate for Reanalysis Stream, Summary Product contains the vertical distribution of the retrieved atmospheric state of peroxyacetyl nitrate (PAN), 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 16 vertical levels from the surface to 0.1 hPa. The principal investigator for the TROPESS project is Kevin W. Bowman.

Get the data

trpsyl2pancrsrs_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TRPSYL2PANCRSRS",
    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.