ATom: Merged Atmospheric Chemistry, Trace Gases, and Aerosols, Version 2

This dataset provides information on greenhouse gases and human-produced air pollution, including atmospheric concentrations of carbon dioxide (CO2), methane (CH4), tropospheric ozone (O3), and black carbon (BC) aerosols, collected during airborne campaigns conducted by NASA's Atmospheric Tomography (ATom) mission. This dataset includes merged data from all instruments plus additional data such as numbered profiles and distance flown. Merged data products have been created for seven different aggregation intervals (1 second, 10 seconds, and 5 instrument-specific intervals). In the case of data obtained over longer time intervals (e.g., flask data), the merge files provide (weighted) averages to match the sampling intervals. This comprehensive dataset will be used to improve the representation of chemically reactive gases and short-lived climate forcers in global models of atmospheric chemistry and climate.

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated May 18, 2026, 17:13 (UTC)
Created April 1, 2025, 14:38 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id 03104fd0-333d-439e-8498-fd8801a9104b
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier 10.3334/ORNLDAAC/1925
license https://www.usa.gov/government-works
modified 2026-05-14T22:12:37Z
programCode {026:000}
publisher ORNL_DAAC
resource-type Dataset
source_datajson_identifier true
source_hash 12a897c2e4f1f8ac50f56563db1123e710895a5c84dc951b62ff01b9fdd2f488
source_schema_version 1.1
spatial [[{"WestBoundingCoordinate":-180.0,"NorthBoundingCoordinate":82.9406,"EastBoundingCoordinate":180.0,"SouthBoundingCoordinate":-86.1769}],"CARTESIAN"]
temporal 2016-07-29/2018-05-21
theme {"Earth Science"}