Global distribution of upper tropospheric formic acid from the ACE-FTS 1Department of Chemistry, University of York, York, UK
2Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
4New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
Received: 17 Mar 2009 – Published in Atmos. Chem. Phys. Discuss.: 20 May 2009 Abstract. We present the first near global upper tropospheric distribution of formic
acid (HCOOH) observed from space using solar occultation measurements from
the Fourier transform spectrometer (FTS) on board the Atmospheric Chemistry
Experiment (ACE) satellite. Using a new set of spectroscopic line parameters
recently published for formic acid by Vander Auwera et al. (2007) and Perrin
and Vander Auwera (2007), we have retrieved the concentrations of HCOOH
between 5 km and the tropopause for ACE-FTS observations from February 2004
to September 2007. We observe a significant seasonal dependence for the
HCOOH concentrations related to vegetation growth and biomass burning. We
estimate an emission ratio of 0.0051±0.0015 for HCOOH relative to CO
for tropical South American fires using a selected set of data for September 2004.
Results from the balloon-borne MkIV Fourier transform spectrometer are
also presented and compared with the ACE measurements.
Revised: 05 Oct 2009 – Accepted: 06 Oct 2009 – Published: 23 Oct 2009
Citation: González Abad, G., Bernath, P. F., Boone, C. D., McLeod, S. D., Manney, G. L., and Toon, G. C.: Global distribution of upper tropospheric formic acid from the ACE-FTS, Atmos. Chem. Phys., 9, 8039-8047, doi:10.5194/acp-9-8039-2009, 2009.