EMS - Radiation Measurements

Data

• hf102-01: radiation data (since 1991) midpt format
• hf102-02: radiation data (since 2006) midpt2 format

Overview

• Lead: David Fitzjarrald, Ricardo Sakai
• Investigators: Matt Czikowsky
• Contact: David Fitzjarrald
• Start date: 1991-07-01
• End date: ongoing
• Location: Prospect Hill Tract (Harvard Forest)
• Latitude: +42.537755
• Longitude: -72.171478
• Elevation: 340 meters
• Taxa:
• Research topic: atmosphere
• Study type: long-term measurement
• LTER core area: disturbance
• Keywords: long wave radiation, PAR, short wave radiation, soil heat flux
• Release date: 1999
• EML version: knb-lter-hfr.102.8
• Revisions:
• Related links:
• Project Website
• EMS - Canopy-Atmosphere Exchange of Carbon, Water and Energy
• Abstract:

  Hourly-averaged measurements of radiation from the SUNYA boom at 27 m on the EMS tower and soil heat flux at Harvard Forest, Petersham, MA

• Methods:
• Use:

  This dataset is released to the public and may be freely downloaded. 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. For more information on LTER Network data access and use policies, please see: http://www.lternet.edu/data/netpolicy.html.

• Citation:

  Fitzjarrald D, Sakai R. 1999. EMS - Radiation Measurements. Harvard Forest Data Archive: HF102.

Detailed Metadata

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

1. year: year of data collection (YYYY)
2. ddy: decimal date (DDD)
3. day: day of year (DDD)
4. hour: hour (hh)
5. Rn: net radiometer (wattsPerMeterSquared )
6. Sup: reflected global solar radiation. Downward fluxes are negative, upward fluxes are positive. (wattsPerMeterSquared )
7. Sdn: incoming global solar radiation. Downward fluxes are negative, upward fluxes are positive. (wattsPerMeterSquared )
8. Lup: upwelling longwave radiation (wattsPerMeterSquared )
9. Ldn: downwelling longwave radiation (wattsPerMeterSquared )
10. soilheat: soil heat flux at 7 cm, below OA (wattsPerMeterSquared )
11. Rnsum: sum of Sup,Sdn,Lup,Ldn with appropriate signs applied. Rnsum=(Sdn+Sup-Ldn+Lup) (wattsPerMeterSquared )
12. PARup: upward photosynthetically active radiation (millimolesPerMeterSquaredPerSecond )
13. PARdn: downward photosynthetically active radiation (millimolesPerMeterSquaredPerSecond )

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

1. year: year of data collection (YYYY)
2. ddy: decimal date at the middle of the interval (DDD)
3. day: day of year (DDD)
4. hour: hour (hh)
5. Sup: reflected global solar radiation. Downward fluxes are negative, upward fluxes are positive. (wattsPerMeterSquared )
6. Sdn: incoming global solar radiation. Downward fluxes are negative, upward fluxes are positive. (wattsPerMeterSquared )
7. Lup: upwelling longwave radiation. Downward fluxes are negative, upward fluxes are positive. (wattsPerMeterSquared )
8. Ldn: downwelling longwave radiation. Downward fluxes are negative, upward fluxes are positive. (wattsPerMeterSquared )
9. soilheat: soil heat flux at 7 cm, below OA (wattsPerMeterSquared )
10. Rnsum: sum of Sup,Sdn,Lup,Ldn with appropriate signs applied. Rnsum=(Sdn+Sup+Ldn+Lup) (wattsPerMeterSquared )
11. PARup: upward photosynthetically active radiation. Downward fluxes are negative, upward fluxes are positive. (millimolesPerMeterSquaredPerSecond )
12. PARdn: downward photosynthetically active radiation. Downward fluxes are negative, upward fluxes are positive. (millimolesPerMeterSquaredPerSecond )
13. Lup(thermopile): upwelling longwave radiation signal from the pyrgeometer thermopile (wattsPerMeterSquared )
14. Ldw(thermopile): downwelling longwave radiation signal from the pyrgeometer thermopile (wattsPerMeterSquared )