uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/11ea1305d6cb8004a205c37c4d345aeb Mark Friedl https://orcid.org/0000-0001-6899-2948 Nathan Phillips Manish Verma Eli Melaas https://orcid.org/0000-0002-8351-3674 2023 English

Our research at the Harvard Forest walk-up tower site examines how seasonality of canopy leaf area, or canopy phenology, influences, and is influenced by, local climate. As part of this activity we are studying methods for (and limits to) remote sensing of canopy phenology. To address this research topic, we have initiated measurements to quantify how radiation fluxes through a deciduous forest canopy are modified by seasonal canopy leaf dynamics. We continuously measure above- and below-canopy radiation fluxes at a variety of spectral bands (shortwave, photosynthetic) and with digital photography. These measurements provide a surrogate measures of canopy leaf area dynamics, and directly represent the radiation component of the surface energy balance. These measurements complement ongoing microclimate and eddy covariance measurements of water and carbon exchange at the EMS flux tower.

phenology photosynthetically active radiation radiation soil temperature LTER controlled vocabulary disturbance 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=hf183 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.171478 -72.171478 +42.537755 +42.537755 340 340 meter 2006 2011 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

Photosynthetically active radiation (PAR) is measured using LI190SB LI-COR quantum radiation sensors. A total of five below-canopy sensors measure downwelling PAR below the forest canopy. The sensors are mounted on posts approximately 0.5 meters above the ground surface and are located roughly 20-m from the walk-up tower at equidistant spacing. Above-canopy quantum sensors (upwelling and downwelling) are mounted on a boom extended from the tower at a height of 23-m. Downwelling and upwelling solar radiation measurements are recorded using a Kipp and Zonen thermopile pyranometer, and global (total) and diffuse PAR measurements are measured using a BF3 sunshine sensor (both at 23-m). BF3 sensor photodiodes are cosine corrected and calibrated for the measurement of PAR quanta. Soil temperatures at 20-cm depth are measured with Campbell Scientific 107-L probes in four locations distributed around the walk-up tower and co-located with PAR sensors. Air temperatures are measured using a shaded CS107-L probe at 23-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. hf183-01-radiation.csv radiation data hf183-01-radiation.csv 11092475 85aa7877419d45fc3e3a5d81d5b95198 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p18/hf183/hf183-01-radiation.csv dataset dataset ID dataset ID datetime date and time YYYY-MM-DDThh:mm year year YYYY doy day of year nominalDay 1 natural NA missing value hour hour hh:mm toc.d.par top-of-canopy downwelling PAR micromolePerMeterSquaredPerSecond 0.000001 real NA missing value toc.u.par top-of-canopy upwelling PAR micromolePerMeterSquaredPerSecond 0.000001 real NA missing value bc.d.par1 below-canopy downwelling PAR 1 micromolePerMeterSquaredPerSecond 0.000001 real NA missing value bc.d.par2 below-canopy downwelling PAR 2 micromolePerMeterSquaredPerSecond 0.000001 real NA missing value bc.d.par3 below-canopy downwelling PAR 3 micromolePerMeterSquaredPerSecond 0.000001 real NA missing value bc.d.par4 below-canopy downwelling PAR 4 micromolePerMeterSquaredPerSecond 0.000001 real NA missing value bc.d.par5 below-canopy downwelling PAR 5 micromolePerMeterSquaredPerSecond 0.000001 real NA missing value toc.d.pyr top-of-canopy downwelling Pyranometer wattPerMeterSquared 0.001 real NA missing value toc.u.pyr top-of-canopy upwelling Pyranometer wattPerMeterSquared 0.001 real NA missing value tsoil1 soil temperature 1 celsius 0.01 real NA missing value tsoil2 soil temperature 2 celsius 0.01 real NA missing value tsoil3 soil temperature 3 celsius 0.01 real NA missing value tsoil4 soil temperature 4 celsius 0.01 real NA missing value tair air temperature celsius 0.01 real NA missing value tsr total solar radiation wattPerMeterSquared 0.001 real NA missing value dsr diffuse solar radiation wattPerMeterSquared 0.001 real NA missing value 89773 atmosphere long-term measurement 1 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf004 https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf102