Column-Averaged Atmospheric Carbon and Water at Harvard Forest since 2018

<para>Ground-based total-atmospheric column measurements of CO2, CH4, CO, and H2O began at Harvard Forest in May 2018 using a solar-viewing Fourier Transform Spectrometer (Bruker EM27/Sun). Observations are made from a platform near the Fisher Meteorological Tower throughout the year on sunny days. Total column observations are sensitive to regional carbon fluxes, and are less impacted by changes in the boundary layer height than tower based in-situ observations. The Harvard Forest observations are complemented by an identical instrument operated on the Harvard campus in Cambridge MA. The two sensors are used to support studies of urban emissions, regional transport, and forest-atmosphere exchange. In addition, the total-column measurements provide key validation data for satellite measurements of greenhouse gases.</para> </section> </abstract> <keywordSet> <keyword>atmosphere</keyword> <keyword>carbon</keyword> <keyword>carbon dioxide</keyword> <keyword>climate change</keyword> <keyword>methane</keyword> <keyword>net ecosystem exchange</keyword> <keyword>water</keyword> <keywordThesaurus>LTER controlled vocabulary</keywordThesaurus> </keywordSet> <keywordSet> <keyword>primary production</keyword> <keywordThesaurus>LTER core area</keywordThesaurus> </keywordSet> <keywordSet> <keyword>Harvard Forest</keyword> <keyword>HFR</keyword> <keyword>LTER</keyword> <keyword>USA</keyword> <keywordThesaurus>HFR default</keywordThesaurus> </keywordSet> <intellectualRights> <section> <para>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.</para> </section> </intellectualRights> <licensed> <licenseName>Creative Commons Zero v1.0 Universal</licenseName> <url>https://spdx.org/licenses/CC0-1.0.html</url> <identifier>CC0-1.0</identifier> </licensed> <distribution> <online> <url function="information"> https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf440 </url> </online> </distribution> <coverage> <geographicCoverage> <geographicDescription>Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum.</geographicDescription> <boundingCoordinates> <westBoundingCoordinate>-72.190</westBoundingCoordinate> <eastBoundingCoordinate>-72.190</eastBoundingCoordinate> <northBoundingCoordinate>+42.533</northBoundingCoordinate> <southBoundingCoordinate>+42.533</southBoundingCoordinate> <boundingAltitudes> <altitudeMinimum>340</altitudeMinimum> <altitudeMaximum>340</altitudeMaximum> <altitudeUnits>meter</altitudeUnits> </boundingAltitudes> </boundingCoordinates> </geographicCoverage> <temporalCoverage> <rangeOfDates> <beginDate> <calendarDate>2018</calendarDate> </beginDate> <endDate> <calendarDate>2025</calendarDate> </endDate> </rangeOfDates> </temporalCoverage> </coverage> <maintenance> <description> <para>ongoing</para> </description> </maintenance> <contact> <positionName>Information Manager</positionName> <organizationName>Harvard Forest</organizationName> <address> <deliveryPoint>324 North Main Street</deliveryPoint> <city>Petersham</city> <administrativeArea>MA</administrativeArea> <postalCode>01366</postalCode> <country>USA</country> </address> <phone phonetype="voice">(978) 724-3302</phone> <electronicMailAddress>hf-im@lists.fas.harvard.edu</electronicMailAddress> </contact> <publisher> <organizationName>Harvard Forest</organizationName> <address> <deliveryPoint>324 North Main Street</deliveryPoint> <city>Petersham</city> <administrativeArea>MA</administrativeArea> <postalCode>01366</postalCode> <country>USA</country> </address> <phone phonetype="voice">(978) 724-3302</phone> <phone phonetype="fax">(978) 724-3595</phone> <onlineUrl>https://harvardforest.fas.harvard.edu</onlineUrl> </publisher> <methods> <methodStep> <description> <section> <para>Column-average Dry Mole Fractions were retrieved from near-infrared solar observations collected using a Bruker EM27/Sun Fourier Transform Spectrometer. Spectra gathered by EM27/Sun #46 located near the Fisher Meteorological Tower were processed using the 2020 version of GGG created by Geoffrey Toon. EGI2020 was used to create inputs for GGG and automate the retrieval process. Details on GGG and EGI are available at https://tccon-wiki.caltech.edu.</para> <para>Column abundances of CO2, H2O, CH4, CO, and O2 were retrieved. The O2 retrieval is used to convert all others into DMFs. For example, dry column-average CO2 DMF has been calculated according to CO2 DMF = 0.2095 x column CO2 / column O2.</para> <para>Spectra are gathered every ~11 seconds, and are then averaged into 15 minute bins.</para> </section> </description> </methodStep> </methods> <project> <title>Harvard Forest Long-Term Ecological Research 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. Other funding: NASA grant 80NSSC21K1069. hf440-01-column-averaged-DMF.csv atmospheric carbon and water data hf440-01-column-averaged-DMF.csv 1410963 2f7d42ac1fb7cfbb4aa4a6ef8277700f 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p44/hf440/hf440-01-column-averaged-DMF.csv datetime date and time of measurement YYYY-MM-DDThh:mm 1 2018-05-02T13:45 2022-12-30T17:30 xco2_ppm column-averaged dry mole fraction of carbon dioxide, parts per million dimensionless 0.001 real NA missing value xch4_ppb column-averaged dry mole fraction of methane, parts per billion dimensionless 0.001 real NA missing value xco_ppb column-averaged dry mole fraction of carbon monoxide, parts per billion dimensionless 0.001 real NA missing value xh2o_ppm column-averaged dry mole fraction of water, parts per million dimensionless 0.001 real NA missing value 28184 atmosphere regional long-term measurement