uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/6f0ac572197eca41899e6f0e3731763f William Munger https://orcid.org/0000-0002-1042-8452 Julian Hadley Mark VanScoy Researcher Liza Nicoll Researcher 2025 English

Carbon dioxide profile measurements are designed to supplement eddy flux measurements in calculating the carbon exchange of a forest. In the case of the Harvard Forest flux towers, the change in CO2 storage between the ground and the height of the eddy flux system during each half hour must be added to the eddy flux measured above the forest to determine the total carbon exchange. The profile measurements are also necessary in order to calculate CO2 movement by advection, or horizontal air transport. The amount of CO2 removed from a particular site by advection is the product of the total CO2 within the air a given range of height above the ground, and the average velocity of airflow parallel to the ground surface within that height range.

carbon dioxide eddy covariance photosynthesis respiration LTER controlled vocabulary primary production 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=hf197 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.185 -72.180 +42.542 +42.539 355 380 meter 2009 2024 ongoing 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

LPH Profile. CO2 profile inlets are at 0.1, 0.3, 1, and 2 m above ground on a short tower about 20 m from the flux tower, and 5, 10, 16 and 21 m above ground on the flux tower. Hemlock Profile. CO2 profile inlets are at 0.3, 1, and 2 m above ground on a short tower about 20 m from the flux tower, and 5, 10, 16, 22 and 29 m above ground on the flux tower. For both LPH and Hemlock profiles, during each 30-minute interval, measurements at each of the 8 levels are made every 10 seconds for a period of 3 or 4 minutes, and concentrations during the last two minutes are used to characterize the CO2 concentration at that level. Data from the first 1 or 2 minutes at each level are discarded, to allow the last air sampled at the previous level, which is still in the tubing at the end of an interval, to pass through the analyzer, insuring that measurements collected are really from the current sampling level.

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. hf197-01-hk-profile.csv Hemlock CO2 profile hf197-01-hk-profile.csv 25823361 fb1c1b3202ab9658a8ba2fbb0ba5eec3 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p19/hf197/hf197-01-hk-profile.csv datetime date and time (EST) of measurement YYYY-MM-DDThh:mm year year of measurement YYYY dec_date day of the year with hours and minutes converted to a decimal fraction of a day nominalDay 0.0001 real l1_co2 CO2 concentration at level 1 dimensionless 0.001 real NA missing value l2_co2 CO2 concentration at level 2 dimensionless 0.001 real NA missing value l3_co2 CO2 concentration at level 3 dimensionless 0.001 real NA missing value l4_co2 CO2 concentration at level 4 dimensionless 0.001 real NA missing value l5_co2 CO2 concentration at level 5 dimensionless 0.001 real NA missing value l6_co2 CO2 concentration at level 6 dimensionless 0.001 real NA missing value l7_co2 CO2 concentration at level 7 dimensionless 0.001 real NA missing value l8_co2 CO2 concentration at level 8 dimensionless 0.001 real NA missing value 275800 hf197-02-lph-profile.csv Little Prospect Hill CO2 profile hf197-02-lph-profile.csv 3130836 bab9629cee398b4c45f6468bf5307e6b 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p19/hf197/hf197-02-lph-profile.csv datetime date and time (EST) of measurement YYYY-MM-DDThh:mm year year of measurement YYYY dec_date day of the year with hours and minutes converted to a decimal fraction of a day nominalDay 0.0001 real l1_co2 CO2 concentration at level 1 dimensionless 0.001 real NA missing value l2_co2 CO2 concentration at level 2 dimensionless 0.001 real NA missing value l3_co2 CO2 concentration at level 3 dimensionless 0.001 real NA missing value l4_co2 CO2 concentration at level 4 dimensionless 0.001 real NA missing value l5_co2 CO2 concentration at level 5 dimensionless 0.001 real NA missing value l6_co2 CO2 concentration at level 6 dimensionless 0.001 real NA missing value l7_co2 CO2 concentration at level 7 dimensionless 0.001 real NA missing value l8_co2 CO2 concentration at level 8 dimensionless 0.001 real NA missing value 35041 atmosphere long-term measurement 1,2 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf103 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf072