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 April 13, 2026, 16:58 (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 667a01f0-77df-4b8b-9f39-d0783e22246b
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 2026-04-06T22:15:59Z
programCode {026:000}
publisher ORNL_DAAC
resource-type Dataset
source_datajson_identifier true
source_hash 1c8d1e9e7c96e0d8d39179cb7a8297b42cae2946ecdb4c9f0def1d7bd7101a46
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"}