uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/433a2448bbda4d72bae4697b6c65f36e Atmospheric Oxygen and Carbon Dioxide at Harvard Forest EMS Tower since 2006 Mark Battle William Munger https://orcid.org/0000-0002-1042-8452 2023 English
This archive features long-term measurements of the atmospheric mixing ratios of O2 and CO2 at two heights on the Harvard Forest EMS flux tower. The data fields include the time of data collection, the height from which the samples were drawn, the O2 mixing ratio and the CO2 mixing ratio.
carbon cycling climate change decomposition net ecosystem exchange oxygen plant physiology soil respiration LTER controlled vocabulary primary production 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=hf306 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.171478 -72.171478 +42.537755 +42.537755 340 340 meter 2006 2013 ongoing Information Manager Harvard Forest
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(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
<para>The values in this dataset were obtained using a modified Oxzilla II differential fuel-cellbased O2 analyzer (made by Sable Systems) and a LiCor 7000 non-dispersive infrared analyzer, also operating differentially. Measurements were made relative to a tank of dry air which was in turn periodically compared to a set of between 2 and 4 long-term standard tanks with filled with dry air with a range of O2 and CO2 values. These tanks are tied to the NOAA/WMO CO2 scale (Zhao and Tans, 2006) and Scripps Institution of Oceanography O2 scale (Keeling et al., 1998 and Keeling et al., 2007). Thus, the dataset here is reported on these scales.</para> <para>Data have already undergone substantial processing and analysis, including the removal of values from periods when the instruments were unstable or unreliable. More detailed descriptions of both the instrumental techniques and the data processing are available from Conley (2018) with further information forthcoming in Battle et al. (in prep.)</para> <para>Values reported here are average values for 4.8-minute sampling periods spaced 12 minutes apart. In general, consecutive values alternate between collections from the low (7.5m) and high (29.0m) intakes. Periodic gaps in the dataset correspond to regularly scheduled calibration runs against the standard tanks (every 6hrs, as well as asynchronous daily and weekly comparisons with other standard tanks). Irregular gaps of varying length result from instrumental problems.</para> </section> </description> </methodStep> </methods> <project> <title>Harvard Forest Long-Term Ecological Research Harvard Forest
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(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. hf306-01-o2-co2.csv O2 and CO2 data hf306-01-o2-co2.csv 3993788 e005cd6b90bb4720625f199a3c284ca6 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p30/hf306/hf306-01-o2-co2.csv date the (decimal) number of days since Jan. 0, 0000 (MatLab datenum) number 0.0001 real NA missing value co2 μmoles/mole on the NOAA/WMO scale dimensionless 0.01 real NA missing value o2 μmoles/mole on the Scripps S2 O2 scale. The Scripps S2 scale is typically expressed in permeg units as δO2/N2. We connect our mole-fraction measurements to the S2 scale by assuming XO2 in the S2 scale is 0.2095 (See Keeling et al. 1998, eqn. 4). dimensionless 0.01 real NA missing value intake height above forest floor 1 29.0 m 0 7.5 m NA missing value data.id serial number used to locate a particular datum in the full (unprocessed) dataset serial number used to locate a particular datum in the full (unprocessed) dataset NA missing value 116619 atmosphere long-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf004