Long term satellite observations of tropospheric formaldehyde HCHO are essential to support air quality and chemistry-climate related studies from the regional to the global scale. Formaldehyde is an intermediate gas in almost all oxidation chains of non-methane volatile organic compounds (NMVOC), leading eventually to CO2. Non-Methane Volatile Organic Compounds (NMVOCs) are, together with NOx, CO and CH4, among the most important precursors of tropospheric O3. The major HCHO source in the remote atmosphere is CH4 oxidation. Over the continents, the oxidation of higher NMVOCs emitted from vegetation, fires, traffic and industrial sources results in important and localized enhancements of the HCHO levels. The seasonal and inter-annual variations of the formaldehyde distribution are principally related to temperature changes and fire events, but also to changes in anthropogenic activities. Its lifetime being of the order of a few hours, HCHO concentrations in the boundary layer can be directly related to the release of short-lived hydrocarbons, which mostly cannot be observed directly from space.
The first months of TROPOMI HCHO observations appear to be of excellent quality. The good signal-to-noise ratio of TROPOMI yields stunning images of HCHO. The global map below shows HCHO concentrations created with TROPOMI L2 data, from the period November 2017 through June 2018. Read more about TROPOMI HCHO via this link.
|Version number||Version Effective Date (orbit range)||Summary of Changes|
|1.01.02||NRTI: 2018-08-08 (orbit 04243 to present)
OFFL: 2018-08-01 (orbit 04147 to present)
|1.01.01||NRTI: 2018-07-18 (orbits 03947 to 04242)
OFFL: 2018-07-11 (orbits 03848 to 04146)
NRTI: 2018-05-09 (orbits 02955 to 03946)
USER DOCUMENTATION: ATBD, PUM, & README
Links to the Algorithm Theoretical Basis Document (ATBD) and the Product User Manual (PUM) are located on the right of this page under Documentation. This data product is planned for release in the third quarter of 2018. Once released, the Product Readme files (PRF) will be made available here.