| Summary: | The ground-based Fourier Transform InfraRed (FTIR) total column measurements of formic acid (HCOOH) reported here have been derived from high-resolution (between 0.004 and 0.011 cm -1 ) IR solar absorption spectra recorded regularly, under clear-sky conditions, at a suite of sites located at various latitudes. Most of them are affiliated with the Network for the Detection of Atmospheric Composition Change (NDACC; http://www.ndacc.org ). End users of this data set are invited to contact the authors to make sure they are using the data properly and check about the possible availability of more recent products. The FTIR monitoring program of ULiège at Jungfraujoch has benefited from the constant involvement of C. Servais and O. Flock. It has been primarily funded by the F.R.S.–FNRS (grant no. J.0147.18), the Fédération Wallonie-Bruxelles, and by the GAW-CH program of MeteoSwiss. We acknowledge the International Foundation High Altitude Research Stations Jungfraujoch and Gornergrat (HFSJG, Bern) for supporting the facilities needed to perform the FTIR observations at Jungfraujoch. Eureka FTIR measurements were made at the Polar Environment Atmospheric Research Laboratory (PEARL) by the Canadian Network for the Detection of Atmospheric Change (CANDAC) led by James R. Drummond, and in part by the Canadian Arctic ACE/OSIRIS Validation Campaigns led by K.A. Walker; support has been provided by AIF/NSRIT, CFI, CFCAS, CSA, ECCC, GOC-IPY, NSERC, NSTP, OIT, PCSP, and ORF. Toronto FTIR measurements were made at the University of Toronto Atmospheric Observatory, supported by CSA, NSERC, ECCC, and UofT. The Wollongong solar remote sensing program has been supported over the years through a series of Australian Research Council grants, most recently DP160101598. Acknowledgements are addressed to the Université de La Réunion and CNRS (LACy-UMR8105 and UMS3365) for their financial support of the FTIR instrumentation at St-Denis, and to C. Hermans, F. Scolas (BIRA-IASB) and J-M. Metzger (Université de La Réunion) for the ...
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