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Related Experiment Video

Updated: Nov 13, 2025

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements

Published on: September 7, 2019

HCOOH measurements from space: TES retrieval algorithm and observed global distribution.

K E Cady-Pereira¹, S Chaliyakunnel², M W Shephard³

¹Atmospheric and Environmental Research, Inc., Lexington, Massachusetts, USA.

Atmospheric Measurement Techniques

|March 15, 2021

Summary

This summary is machine-generated.

The Tropospheric Emission Spectrometer (TES) satellite provides new data on formic acid (HCOOH) distribution. Global HCOOH levels are higher than models predict, suggesting missing sources from biogenic emissions and fires.

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Last Updated: Nov 13, 2025

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Area of Science:

Atmospheric Chemistry
Remote Sensing
Satellite Observations

Background:

Formic acid (HCOOH) is a significant atmospheric carboxylic acid.
Understanding its global distribution is crucial for atmospheric chemistry.
Previous measurements have had limitations in global coverage and resolution.

Purpose of the Study:

To describe the retrieval algorithm for formic acid (HCOOH) from the Tropospheric Emission Spectrometer (TES) satellite.
To quantify the global distribution of tropospheric HCOOH using TES data.
To compare TES HCOOH measurements with chemical transport model (GEOS-Chem) predictions.

Main Methods:

Optimal estimation methodology for spectral retrieval.
Analysis of spectral microwindows and a priori constraints.
Comprehensive error, sensitivity, and performance analysis of the HCOOH retrieval.

Main Results:

TES HCOOH retrievals offer limited vertical sensitivity, primarily between 900-600 hPa with ~2 km resolution.
Detection limits for HCOOH are around 0.5 ppbv, dependent on thermal contrast.
TES-derived global HCOOH distribution shows seasonality broadly matching GEOS-Chem CTM but with higher overall concentrations.

Conclusions:

TES satellite data reveals higher atmospheric formic acid (HCOOH) concentrations than current models simulate.
Discrepancies are pronounced in summer and over biomass burning regions.
This suggests significant underestimation of HCOOH sources, likely from biogenic emissions and fires, in atmospheric models.