Environmental Meteorology - University of Freiburg

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Published March 31, 2025 | Version 1.0
Dataset Open

Above-canopy solar irradiance measurements at Hartheim Forest Research Site (DE-Har) from 2021-01-01 to 2021-12-31 [L2]

Authors/Creators

  • 1. ROR icon University of Freiburg

Contributors

  • 1. ROR icon University of Freiburg

Description

Quality controlled and gap-filled continuous solar irradiance measurements at 29.5 m above ground level measured on a tower above the forest canopy at Hartheim Forest Research Site (ICOS Associate Ecosystem Site DE-Har, UFR Code: HARTHM, 7.59814ºE, 47.93391ºN, 201 m) measured using a ventilated pyranometer CM21 (Kipp & Zonen, Delft, Netherlands). The pyranometer was operated on the 30 m tower connected to a CR3000 data logger. The pyranometer was cross-calibrated aganst a newly factory-calibrated system in 2020 and is regularly cleaned and maintained.

  • Quality controlled above-canopy solar irradiance data are available and aggregated at 10min, 30min, hourly, daily, monthly and yearly resolution for the year 2021. Values are averages during the periods shown.
  • Solar irradiance in this dataset is equal "global irradiance" or "global hemispherical irrandiance" and does not distinguish between direct and diffuse irradiance.
  • Modeled extraterrestrial irradiance (based on the NOAA General Solar Position Calculations of the NOAA Global Monitoring Division and considering the Earth's elliptical orbit) is provided for comparison, along with the ratio of solar irradiance to extraterrestrial  irradiance at 10min, 30min, hourly, daily, monthly and yearly resolution. Extraterrestrial irradiance is average of period show.
  • Number of hours with solar irradiance >5 W/m2 (daylight hours) and > 120 W/m2 (sometimes used as threshold for "sun hours") provided on daily, monthly, and annual scale.
  • Number of days with solar irradiance >5 W/m2 (quality check) and > 120 W/m2 ("sun hours") provided on monthly, and annual scale.
  • Detailed information on gap-filled data is provided.
  • Note: All times are provided in UTC, not local time.

For more details read `HARTHM_2021_SolarIrradiance_MetaData.txt`.

Notes (English)

COPYRIGHT

Creative Commons Attribution 4.0 International. Copyright Albert-Ludwigs-Universität Freiburg, Professur für Umweltmeteorologie, Werthmannstrasse 10, Freiburg, Germany.

CREATOR

This work was created by the University of Freiburg, Germany.

ATTRIBUTION

The site is operated as part of the Integrated Carbon Observation System (ICOS).

Instruments and sensors in the dataset were operated by the Chair of Environmental Meteorology, University of Freiburg, Germany.

DISCLAIMER

The use of the work is at the user's own risk. The authors and/or the involved institutions, accept no liability for material or non-material damage arising from the use or non-use or from the use of incorrect or incomplete information in this work. The author and/or the involved institutions are not responsible for any use that may be made of the information in this work. The legal provisions remain unaffected.

MATERIAL NOTICE

The notices cover data in databases, text and images contained in the work.

MATERIAL URI

Hartheim Forest Research Site

DE-Har in the ICOS Carbon Portal

Files

HARTHM_2021_SolarIrradiance_Monthly_UTC.csv

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Additional details

Related works

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Dataset: 10.5281/zenodo.15116499 (DOI)
Is continued by
Dataset: 10.5281/zenodo.15116432 (DOI)

Funding

University of Freiburg

Dates

Collected
2021-01-01/2021-12-31