uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/fb8fbe8ca470023034fbad3fe29dfa55 Steven Wofsy https://orcid.org/0000-0002-3133-2089 Elaine Gottlieb Diana Barnes Researcher Geoff Dutton Researcher James Elkins Researcher Michael McElroy Researcher 2023 English

Measurements of 13 ozone-depleting and/or greenhouse gases are taken above the forest canopy at Harvard Forest, downwind of the New York City - Washington, D. C. corridor, every 25 minutes using a four-channel gas chromatographic system called FACTS (Forest and Atmosphere Chromatograph of Trace Species). The species measured are H2, CO, CH4, methyl chloroform (CH3CCl3), chloroform (CHCl3), carbon tetrachloride (CCl4), CFC-11 (CCl3F), CFC-12 (CCl2F2), CFC-113 (C2Cl3F3), halon-1211 (CBrClF2), perchlorethylene (C2Cl4), nitrous oxide (N2O), and sulfur hexafluoride (SF6). Observations began in January 1996 and are continuing.

air pollution carbon monoxide hydrogen nitrous oxide sulfur hexafluoride urban LTER controlled vocabulary inorganic nutrients LTER core area Harvard Forest HFR LTER USA HFR default

This dataset is released to the public under Creative Commons CC0 1.0 (No Rights Reserved). Please keep the dataset creators informed of any plans to use the dataset. Consultation with the original investigators is strongly encouraged. Publications and data products that make use of the dataset should include proper acknowledgement.

Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html CC0-1.0 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf067 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.171478 -72.171478 +42.537755 +42.537755 340 340 meter 1996 2005 complete Information Manager Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 hf-im@lists.fas.harvard.edu Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu

FACTS is a fully automated, four-channel gas chromatograph with packed columns and electron capture detectors. Atmospheric measurements alternate with calibration standard measurements every 25 minutes; the air samples are from above the canopy of the forest (29 m).

Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 https://harvardforest.fas.harvard.edu https://ror.org/059cpzx98 pointOfContact The Harvard Forest Long-Term Ecological Research (LTER) program examines ecological dynamics in the New England region resulting from natural disturbances, environmental change, and human impacts. National Science Foundation LTER grants: DEB-8811764, DEB-9411975, DEB-0080592, DEB-0620443, DEB-1237491, DEB-1832210. hf067-01-FACTS.csv FACTS data hf067-01-FACTS.csv 20808784 2627ead83cf0f1708801dcabf94d2895 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p06/hf067/hf067-01-FACTS.csv datetime date and time YYYY-MM-DDThh:mm year year YYYY julian day number from 1 January 1996 (GMT) nominalDay 0.0001 real doy day of year (GMT) nominalDay 0.0001 real wdir wind direction sector 1 NE (0-90) 2 SE (90-180) 3 SW (180-270) 4 NW (270-360) h2 Hydrogen (ppb) dimensionless 6.36 real NA missing value ch4 Methane (ppb) dimensionless 9.10 real NA missing value co Carbon Monoxide (ppb) dimensionless 2.31 real NA missing value cfc12 CFC-12 (ppb) dimensionless 1.15 real NA missing value h1211 Halon 1211 (ppt) dimensionless 0.06 real NA missing value cfc11 CFC-11 (ppt) dimensionless 0.56 real NA missing value cfc113 CFC-113 (ppt) dimensionless 0.68 real NA missing value chcl3 Chloroform (ppt) dimensionless 0.51 real NA missing value mc Methyl Chloroform (CH3CCl3) (ppt) dimensionless 0.79 real NA missing value ct Carbon Tetrachloride (CCl4) (ppt) dimensionless 0.56 real NA missing value tce Trichloroethylene (C2HCl3) (ppt) dimensionless 1 real NA missing value pce Perchloroethylene (C2Cl4) (ppt) dimensionless 0.23 real NA missing value n2o Nitrous Oxide (ppb) dimensionless 2.32 real NA missing value sf6 SF6 (ppt) dimensionless 0.62 real NA missing value 153146 atmosphere long-term measurement 1 https://atmos.seas.harvard.edu/lab/ https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf004