OMPS-N20 NM PCA SO2 Step 1 Total Column 1-Orbit L2 Swath 17x13km

The OMPS-N20_NM_PCA_SO2 Step1 Total Column 1-Orbit L2 Swath 17x13km collection 1 product contains the retrieved sulfur dioxide (SO2) measured by the Ozone Mapping and Profiling Suite (OMPS) Nadir-Mapper (NM) sensor on the NOAA-20 (JPSS-1) satellite. The product is based on the NASA Goddard Space Flight Center principal component analysis (PCA) spectral fitting algorithm (Li et al., 2013, 2017) used to retrieve the SO2 total column amounts assuming different SO2 plume heights, including the boundary layer (lowest 1 km of the atmosphere), the lower (centered at 3 km), middle (centered at 8 km) and upper (centered at 13 km) troposphere, as well as the lower stratosphere (centered at 18 km).

Each granule contains data from the daylight portion for a single orbit or about 50 minutes. Spatial coverage is global (-90 to 90 degrees latitude), and there are about 14 orbits per day each with a swath width of 2600 km. There are 104 pixels in the cross-track direction before February 13, 2019 with a pixel resolution of about 17 km x 17 km at nadir. Since then, the pixel resolution has been enhanced to 17 km x 13 km at nadir, with 140 pixels in the cross-track direction. The files are written using netCDF version 4.

Data and Resources

Additional Info

Field Value
Maintainer Can Li, PH. D
Last Updated April 23, 2025, 22:38 (UTC)
Created April 23, 2025, 22:38 (UTC)
accessLevel public
bureauCode {026:00}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://data.nasa.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
citation Can Li, Nickolay A. Krotkov, Peter Leonard, et al.. 2023-12-04. OMPS_N20_NMSO2_PCA_L2_Step1. Version 1. OMPS-N20 NM PCA SO2 Step 1 Total Column 1-Orbit L2 Swath 17x13km. Greenbelt, MD, USA. OMPS_N20_NMSO2_PCA_L2_Step1. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). https://doi.org/10.5067/OMPS/OMPS_N20_NMSO2_PCA_L2_Step1.1. https://disc.gsfc.nasa.gov/datacollection/OMPS_N20_NMSO2_PCA_L2_Step1_1.html. Digital Science Data.
creator Can Li, Nickolay A. Krotkov, Peter Leonard, et al.
data-presentation-form Digital Science Data
graphic-preview-description OMPS NOAA-20 Nadir Mapper Column Amount SO2 STL for 2019-07-01
graphic-preview-file https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/OMPS_NPP_NMSO2_L2_2.gif
harvest_object_id 8d23749c-73b0-4ac4-a221-e7541d0062d5
harvest_source_id 61638e72-b36c-4866-9d28-551a3062f158
harvest_source_title DNG Legacy Data
identifier C2808692512-GES_DISC
issue-identification OMPS_N20_NMSO2_PCA_L2_Step1
issued 2023-10-25
landingPage https://doi.org/10.5067/OMPS/OMPS_N20_NMSO2_PCA_L2_Step1.1
language {en-US}
metadata_type geospatial
modified 2023-10-25
programCode {026:001}
publisher NASA/GSFC/SED/ESD/GCDC/GESDISC
references {https://doi.org/10.5194/amt-10-1495-2017,https://doi.org/10.5194/amt-10-445-2017,https://doi.org/10.1002/2013GL058134,https://doi.org/10.5194/amt-2020-186}
release-place Greenbelt, MD, USA
resource-type Dataset
series-name OMPS_N20_NMSO2_PCA_L2_Step1
source_datajson_identifier true
source_hash d615787dbe504a93fd0b3ff59e4c9837a36eb91bdb1a8e362c174b2841221c7a
source_schema_version 1.1
spatial -180.0 -90.0 180.0 90.0
temporal 2018-01-16T00:00:00Z/2023-12-18T00:00:00Z
theme {NPP-JPSS,geospatial}