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Harvard Forest Data Archive

HF102

Radiation Measurements at Harvard Forest EMS Tower 1991-2007

Related Publications

Data

Overview

  • Lead: David Fitzjarrald, Ricardo Sakai
  • Investigators: Matt Czikowsky
  • Contact: David Fitzjarrald
  • Start date: 1991
  • End date: 2007
  • Status: completed
  • Location: Prospect Hill Tract (Harvard Forest)
  • Latitude: +42.537755
  • Longitude: -72.171478
  • Elevation: 340 meter
  • Taxa:
  • Release date: 2009
  • Revisions:
  • EML file: knb-lter-hfr.102.21
  • DOI: digital object identifier
  • Related links:
  • Study type: long-term measurement
  • Research topic: forest-atmosphere exchange
  • LTER core area: disturbance
  • Keywords: heat flux, net radiation, photosynthetically active radiation, radiation, solar radiation
  • Abstract:

    Measurements of radiation and soil heat flux at the EMS tower on the Prospect Hill Tract, Harvard Forest, Petersham, Massachusetts. Values are hourly averages.

  • Methods:

    Radiation measurements are made from the SUNYA boom at 27 m on the EMS tower.

  • Use:

    This dataset is released to the public under Creative Commons license CC BY (Attribution). Please keep the designated contact person informed of any plans to use the dataset. Consultation or collaboration with the original investigators is strongly encouraged. Publications and data products that make use of the dataset must include proper acknowledgement.

  • Citation:

    Fitzjarrald D, Sakai R. 2009. Radiation Measurements at Harvard Forest EMS Tower 1991-2007. Harvard Forest Data Archive: HF102.

Detailed Metadata

hf102-01: radiation data (since 1991) midpt format

  1. datetime: date and time of data collection
  2. year: year of data collection
  3. dec.doy: decimal date (unit: nominalDay )
  4. doy: day of year (unit: nominalDay )
  5. hour: hour (unit: nominalHour )
  6. rn: net radiometer (unit: wattPerMeterSquared / missing value: NA)
  7. s.up: reflected global solar radiation. Downward fluxes are negative, upward fluxes are positive. (unit: wattPerMeterSquared / missing value: NA)
  8. s.dn: incoming global solar radiation. Downward fluxes are negative, upward fluxes are positive. (unit: wattPerMeterSquared / missing value: NA)
  9. l.up: upwelling longwave radiation (unit: wattPerMeterSquared / missing value: NA)
  10. l.dn: downwelling longwave radiation (unit: wattPerMeterSquared / missing value: NA)
  11. soilheat: soil heat flux at 7 cm, below OA (unit: wattPerMeterSquared / missing value: NA)
  12. rn.sum: sum of Sup,Sdn,Lup,Ldn with appropriate signs applied. Rnsum=(Sdn+Sup-Ldn+Lup) (unit: wattPerMeterSquared / missing value: NA)
  13. par.up: upward photosynthetically active radiation (unit: millimolePerMeterSquaredPerSecond / missing value: NA)
  14. par.dn: downward photosynthetically active radiation (unit: millimolePerMeterSquaredPerSecond / missing value: NA)

hf102-02: radiation data (since 2006) midpt2 format

  1. datetime: date and time of data collection
  2. year: year of data collection
  3. dec.doy: decimal date at the middle of the interval (unit: nominalDay )
  4. doy: day of year (unit: nominalDay )
  5. hour: hour (unit: nominalHour )
  6. s.up: reflected global solar radiation. Downward fluxes are negative, upward fluxes are positive. (unit: wattPerMeterSquared / missing value: NA)
  7. s.dn: incoming global solar radiation. Downward fluxes are negative, upward fluxes are positive. (unit: wattPerMeterSquared / missing value: NA)
  8. l.up: upwelling longwave radiation. Downward fluxes are negative, upward fluxes are positive. (unit: wattPerMeterSquared / missing value: NA)
  9. l.dn: downwelling longwave radiation. Downward fluxes are negative, upward fluxes are positive. (unit: wattPerMeterSquared / missing value: NA)
  10. soilheat: soil heat flux at 7 cm, below OA (unit: wattPerMeterSquared / missing value: NA)
  11. rn.sum: sum of Sup,Sdn,Lup,Ldn with appropriate signs applied. Rnsum=(Sdn+Sup+Ldn+Lup) (unit: wattPerMeterSquared / missing value: NA)
  12. par.up: upward photosynthetically active radiation. Downward fluxes are negative, upward fluxes are positive. (unit: millimolePerMeterSquaredPerSecond / missing value: NA)
  13. par.dn: downward photosynthetically active radiation. Downward fluxes are negative, upward fluxes are positive. (unit: millimolePerMeterSquaredPerSecond / missing value: NA)
  14. l.up.therm: upwelling longwave radiation signal from the pyrgeometer thermopile (unit: wattPerMeterSquared / missing value: NA)
  15. l.dn.therm: downwelling longwave radiation signal from the pyrgeometer thermopile (unit: wattPerMeterSquared / missing value: NA)