uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read doi:10.6073/pasta/28a6484059ff4619a24d064483bfd23d Aaron Ellison https://orcid.org/0000-0003-4151-6081 William Munger https://orcid.org/0000-0002-1042-8452 Mark VanScoy Researcher 2025 English

The HDW (Hardwood) microclimate and walkup tower at Harvard Forest became operational in April 2014. The site was chosen to represent the mixed hardwood forest around the EMS and NEON towers and to provide a platform for research projects without access to those towers. Microclimate data are archived annually and recent data are available upon request. Measured values include air temperature, relative humidity, PAR, net radiation, albedo, wind speed and direction, soil temperature and soil moisture.

air temperature climate meteorology microclimate net radiation photosynthetically active radiation relative humidity soil temperature solar radiation wind direction wind speed 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=hf282 Prospect Hill Tract (Harvard Forest). Coordinates based on WGS84 datum. -72.174249 -72.174249 +42.535076 +42.535076 380 380 meter 2014 2024 genus Acer species rubrum red maple genus Quercus species rubra red oak 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

Observation periods are 30-minute with the time stamp representing the end of the sampling interval. All times are Eastern Standard Time (UTC-5).

1. Photosynthetically active radiation (PAR): LI-190 SA quantum sensors--Licor. 2. Co-located air temperature and relative humidity sensors: Campbell HMP 45C (replaced August 2014); Campbell CS215 (August 2014 – present). 3. Aspirated Radiation shield: Model 43502 RM Young (2014-present). 4. Radiation-shielded and ventilated precision air temperature sensors (2010-2014): Met-One, Inc., Grants Pass, OR, USA). 5. Soil moisture sensors: Campbell CS-616. 6. Net radiometer: Kippen Zonen, NR-Lite (2005-2014). 7. Four component net radiometer: Huskeflux NR01 (2014-present). 8. Wind anemometer: RM Young Wind Monitor 05103 (2014-present). 9. Understory Air and soil temperature thermistors: homemade similar to T109 thermistor from Campbell Scientific.

All tower meteorological measurements are taken on the south side of the tower. The four component net radiometer is located at 28 meters. A profile of PAR, temperature and relative humidity are located at 28 meters, 18 meters, and 9 meters. Wind speed and direction are measured at 30 meters. There are two under story measuring site below the tower. US1 is located 10 meter south of the tower. US2 is located 30 meters southwest of the tower. At each site PAR and air temperature are measured at 1 meter. Soil water content is an integrated measurement of the top 10 cm of soil.

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. hf282-01-hdwd-tower.csv hardwood tower data (May 2014 – present) hf282-01-hdwd-tower.csv 89053443 e9bc867b6d06e4b4cebc0aabdbb7c215 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p28/hf282/hf282-01-hdwd-tower.csv datetime date and time stamp YYYY-MM-DDThh:mm 1 minute NA missing value dec_date decimal date nominalDay real NA missing value parac_up photosynthetically active radiation measured above the canopy at 28 m height, up facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value parac_down photosynthetically active radiation measured above the canopy at 28 m height, down facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value parmid photosynthetically active radiation measured mid canopy at 18 m height, up facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value parlow photosynthetically active radiation measured at lower canopy at 9 m height, up facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value rn net radiation measured above the canopy at 28 m wattPerMeterSquared 0.00000001 real NA missing value albedo albedo at 28 m dimensionless 0.00000001 real NA missing value rs_down short wave radiation at 28 m, down welling wattPerMeterSquared 0.00000001 real NA missing value rs_up short wave radiation at 28 m, up welling wattPerMeterSquared 0.000000001 real NA missing value rl_down long wave radiation at 28 m, down welling wattPerMeterSquared 0.0001 real NA missing value rl_up long wave radiation at 28 m, up welling wattPerMeterSquared 0.0001 real NA missing value tnr01 temp Kelvin at 28 m, 4 channel net radiometer kelvin 0.0001 real NA missing value airt_ac air temperature measured above the canopy at 28 m height celsius 0.000001 real NA missing value rh_ac relative humidity measured above the canopy at 28 m height dimensionless 0.00001 real NA missing value airt_mid air temperature measured mid canopy at 18 m height celsius 0.000001 real NA missing value rh_mid relative humidity measured mid canopy at 18 m height dimensionless 0.00001 real NA missing value airt_low air temperature measured at lower canopy at 9 m height celsius 0.000001 real NA missing value rh_low relative humidity measured at lower canopy at 9 m height dimensionless 0.00001 real NA missing value ws wind speed at 28 m height metersPerSecond 0.001 real NA missing value wsres horizontal resultant vector wind speed at 28 m height metersPerSecond 0.001 real NA missing value winddir wind direction at 28 m height degree 0.1 real NA missing value winddir_sd1 wind direction standard deviation at 28 m height degree 0.01 real NA missing value parac_up_max maximum photosynthetically active radiation measured above the canopy at 28 m height, up facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value parac_down_max maximum photosynthetically active radiation measured above the canopy at 28 m height, down facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value parmid_max maximum photosynthetically active radiation measured mid canopy at 18 m height, up facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value parlow_max maximum photosynthetically active radiation measured at lower canopy at 9 m height, up facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value rn_max maximum net radiation at 28 m height wattPerMeterSquared 0.000001 real NA missing value albedo_max maximum albedo at 28 m dimensionless 0.000000001 real NA missing value rs_down_max maximum short wave radiation, down welling, at 28 m height wattPerMeterSquared 0.000001 real NA missing value rs_up_max maximum short wave radiation, up welling, at 28 m height wattPerMeterSquared 0.0000001 real NA missing value rl_down_max maximum long wave radiation, down welling, at 28 m height wattPerMeterSquared 0.0001 real NA missing value rl_up_max maximum long wave radiation, up welling, at 28 m height wattPerMeterSquared 0.0001 real NA missing value airt_ac_max maximum above canopy temperature at 28 m height celsius 0.001 real NA missing value rh_ac_max maximum above canopy relative humidity at 28 m height dimensionless 0.001 real NA missing value airt_mid_max maximum mid canopy temperature at 18 m height celsius 0.001 real NA missing value rh_mid_max maximum mid canopy relative humidity at 18 m height dimensionless 0.001 real NA missing value airt_low_max maximum lower canopy temperature at 9 m height celsius 0.001 real NA missing value rh_low_max maximum lower canopy relative humidity at 9 m height dimensionless 0.001 real NA missing value ws_max maximum wind speed at 28 m height metersPerSecond 0.001 real NA missing value parac_up_min minimum photosynthetically active radiation measured above the canopy at 28 m height, up facing micromolePerMeterSquaredPerSecond 0.000000001 real NA missing value parac_down_min minimum photosynthetically active radiation measured above the canopy at 28 m height, down facing micromolePerMeterSquaredPerSecond 0.0000001 real NA missing value parmid_min minimum photosynthetically active radiation measured mid canopy at 18 m height, up facing micromolePerMeterSquaredPerSecond 0.0000001 real NA missing value parlow_min minimum photosynthetically active radiation measured at lower canopy at 9 m height, up facing micromolePerMeterSquaredPerSecond 0.00000001 real NA missing value rn_min minimum net radiation measured at 28 m height wattPerMeterSquared 0.000001 real NA missing value albedo_min minimum albedo dimensionless 0.00000001 real NA missing value rs_down_min minimum short wave radiation, down welling, at 28 m height wattPerMeterSquared 0.000001 real NA missing value rs_up_min minimum short wave radiation, up welling, at 28 m height wattPerMeterSquared 0.00000001 real NA missing value rl_down_min minimum long wave radiation, down welling at 28 m height wattPerMeterSquared 0.0001 real NA missing value rl_up_min minimum long wave radiation, up welling at 28 m height wattPerMeterSquared 0.0001 real NA missing value airt_ac_min minimum above canopy temperature at 28 m height celsius 0.001 real NA missing value rh_ac_min minimum above canopy relative humidity at 28 m height dimensionless 0.001 real NA missing value airt_mid_min minimum mid canopy temperature at 18 m height celsius 0.001 real NA missing value rh_mid_min minimum mid canopy relative humidity at 18 m height dimensionless 0.001 real NA missing value airt_low_min minimum lower canopy temperature at 9 m height celsius 0.001 real NA missing value rh_low_min minimum lower canopy relative humidity at 9 m height dimensionless 0.001 real NA missing value 187497 hf282-02-hdwd-tower-understory.csv hardwood tower understory data (May 2015-present) hf282-02-hdwd-tower-understory.csv 27211587 2aeff25cfc6260886135806d0f5c0a76 1 \r\n column , https://harvardforest.fas.harvard.edu/data/p28/hf282/hf282-02-hdwd-tower-understory.csv datetime date and time stamp YYYY-MM-DDThh:mm NA missing value dec_date decimal date nominalDay 0.0000001 real NA missing value parus1 photosynthetically active radiation, understory site 1, 10m south of tower, at 1 m height micromolePerMeterSquaredPerSecond 0.001 real NA missing value parus2 photosynthetically active radiation, understory site 2, 30m southwest of tower, at 1 m height micromolePerMeterSquaredPerSecond 0.001 real NA missing value airt_us1 understory air temperature site 1, 10m south of tower, at 1 m height celsius 0.01 real NA missing value airt_us2 understory air temperature site 2, 30m southwest of tower, at 1 m height celsius 0.01 real NA missing value soilt_us1 soil temperature site 1, 10m south of tower celsius 0.01 real NA missing value soilt_us2 soil temperature site 2, 30m southwest of tower celsius 0.01 real NA missing value vwc1 soil volumetric water content site 1, 10m south of tower dimensionless 0.01 real NA missing value vwc2 soil volumetric water content site 2, 30m southwest of tower dimensionless 0.01 real NA missing value parus1_max maximum photosynthetically active radiation understory site 1, 10m south of tower, 1 m height micromolePerMeterSquaredPerSecond 0.001 real NA missing value parus2_max maximum photosynthetically active radiation understory site 2, 30m southwest of tower, 1 m height micromolePerMeterSquaredPerSecond 0.001 real NA missing value airt_us1_max maximum understory air temperature site 1, 10m south of tower, at 1 m height celsius 0.01 real NA missing value airt_us2_max maximum understory air temperature site 2, 30m southwest of tower, at 1 m height celsius 0.01 real NA missing value soilt_us1_max maximum soil temperature site 1, 10m south of tower celsius 0.01 real NA missing value soilt_us2_max mximum soil temperature site 2, 30m southwest of tower celsius 0.01 real NA missing value vwc1_max maximum soil volumetric water content site 1, 10m south of tower dimensionless 0.01 real NA missing value vwc2_max maximum soil volumetric water content site 2, 30m southwest of tower dimensionless 0.01 real NA missing value parus1_min minimum photosynthetically active radiation understory site 1, 10m south of tower, at 1 m height micromolePerMeterSquaredPerSecond 0.001 real NA missing value parus2_min minimum photosynthetically active radiation understory site 2, 30m southwest of tower, at 1 m height micromolePerMeterSquaredPerSecond 0.001 real NA missing value airt_us1_min minimum understory air temperature site 1, 10m south of tower, at 1 m height celsius 0.01 real NA missing value airt_us2_min minimum understory air temperature site 2, 30m southwest of tower, at 1 m height celsius 0.01 real NA missing value soilt_us1_min minimum soil temperature site 1, 10m south of tower celsius 0.01 real NA missing value soilt_us2_min minimum soil temperature site 2, 30m southwest of tower celsius 0.01 real NA missing value vwc1_min minimum soil volumetric water content site 1, 10m south of tower dimensionless 0.01 real NA missing value vwc2_min minimum soil volumetric water content site 2, 30m southwest of tower dimensionless 0.01 real NA missing value 168582 atmosphere plot long-term measurement https://harvardforest.fas.harvard.edu/exist/apps/datasets/showData.html?id=hf206