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Full catalog/OMOCLO
OMOCLO·v003·dataset

Chlorine dioxide gas overhead (OMI)

OMI/Aura Chlorine Dioxide (OClO) Total Column 1-orbit L2 Swath 13x24 km V003 (OMOCLO) at GES DISC
atmosphere NASA GES_DISC Level 2 active
In plain English

What it measures. The total amount of chlorine dioxide gas in a vertical slice of the atmosphere above each spot, along with error estimates and quality flags. Chlorine dioxide is tied to the chemistry that destroys ozone.

How it's made. Derived from the Ozone Monitoring Instrument aboard NASA's Aura satellite, covering the sunlit part of each orbit at roughly 13 by 24 km resolution.

How & where you'd use it. Used by atmospheric scientists to study ozone-destroying chemistry, particularly in polar regions where chlorine compounds play a big role in ozone loss.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › HALOCARBONS AND HALOGENS › CHLORINE DIOXIDE

Coverage & cadence

  • Time span2004-10-01 → ongoing
  • Measured byAura (OMI)
  • 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 Aura Ozone Monitoring Instrument (OMI) collection-3 Chlorine Dioxide Product OMOCLO is now available from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) for public access. The shortname for this Level-2 OMI total column OClO product is OMOCLO. The algorithm leads for this product are the US OMI scientists Dr. Kelly Chance and Dr. Thomas Kurosu from the Harvard-Smithsonian Center, Cambridge, MA. The OMOCLO product contains slant column OClO, standard errors (rms and sigma), quality flags, geolocation and other ancillary information. The OMOCLO files are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5). Each file contains data from the day lit portion of an orbit (~53 minutes). There are approximately 14 orbits per day. The maximum file size for the OMOCLO data product is about 20 MB.

Get the data

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

results = earthaccess.search_data(
    short_name="OMOCLO",
    version="003",
    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.