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README_HCOOH_TOWER.txt
Updated 05/26/2020
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This folder contains 10 Hz HCOOH mixing ratio measurements from the
PROPHET-AMOS campaign archived in association with the following 
manuscript:
Alwe, H.D., D.B. Millet, X. Chen, J.D. Raff, Z.C. Payne, and K. 
Fledderman (2019), Oxidation of volatile organic compounds as the 
major source of formic acid in a mixed forest canopy, Geophys. Res. 
Lett., 46, 2940-2948, doi:10.1029/2018GL081526.

Further details can be found in:
Millet, D.B., H.D. Alwe, X. Chen, M.J. Deventer, T.J. Griffis, R.
Holzinger, S.B. Bertman, P.S. Rickly, P.S. Stevens, T. Léonardis,
N. Locoge, S. Dusanter, G.S. Tyndall, S.L. Alvarez, M.H. Erickson,
and J.H. Flynn (2018), Bidirectional ecosystem-atmosphere fluxes of
volatile organic compounds across the mass spectrum: How many
matter?, ACS Earth Space Chem., 2, 764-777,
doi:10.1021/acsearthspacechem.8b00061

The R (www.r-project.org) datafile HCOOH_TOWER.RDS contains the
 following 2 data columns:
1) day_of_year_edt, decimal day of year (12:01am on Jan 1 = 1.0007)
 in local time (EDT)
2) hcooh_ppb, 10Hz HCOOH mixing ratios (ppb)

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Description of sampling procedure
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The hourly sampling sequence was as follows:
 0:00-0:30, sampling from 34 m inlet
 0:30-0:35, instrument blank
 0:35-0:40, sampling from 21 m inlet
 0:40-0:45, sampling from 17 m inlet
 0:45-0:50, sampling from 13 m inlet
 0:50-0:55, sampling from 9 m inlet
 0:55-0:60, sampling from 5 m inlet

Sufficient buffers should be used to allow sufficient purging time
 following valve switching.
Periodic data gaps result from calibration and instrument downtime.
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If you plan to use this data please contact us so that we can
 track usage and alert users of any updates.
Dylan Millet
University of Minnesota
dbm@umn.edu
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