Environmental Meteorology - University of Freiburg
Published February 3, 2026 | Version 1.0
Dataset Open

Atmospheric visibility measurements at Hartheim Forest Research Site (DE-Har) from 2025-01-01 to 2025-12-31 [L2]

Authors/Creators

  • 1. ROR icon University of Freiburg

Contributors

  • 1. ROR icon University of Freiburg

Description

Quality controlled and gap-filled continuous atmospheric visibility data (Meteorological Observable Range MOR) measured above the forest canopy on a tower at Hartheim Forest Research Site (ICOS Associate Ecosystem Site DE-Har, UFR Code: HARTHM, 7.59814ºE, 47.93391ºN, 201 m) using an a forward scatter system (CS125, Present Weather and Visibility sensor, Campbell Scientific Inc.) operated 20 m above ground level.

  • Quality controlled atmospheric visibility data are available and aggregated at 10min, 30min, hourly, daily, monthly and yearly resolution for the year 2025.
  • Average, minimum and maximum visibility are provided on hourly, daily, monthly and annual scales.
  • Hours and days with at least one minute of a visibility of less than 20, 10, 4, 2, 1, 0.5 and 0.2 km based on the WMO classes are provided on daily, monthly and annual scales. Can be used to determine frequency of fog conditions.
  • Hours and days with at least one minute of a visibility of greater than 50 km are provided on daily, monthly and annual scales.
  • Maximum visibility output by the CS125 is 75 km, so a value of 75 km means greater or equal 75 km. Averaged visibility accounts for values greater than 75 km with 75 km.
  • Detailed information on gap-filled data is provided.
  • Note: All times are provided in UTC, not local time.

For more details read `HARTHM_2025_Visibility_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_2025_Visibility_10min_UTC.csv

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Additional details

Related works

Continues
10.5281/zenodo.14565190 (DOI)

Funding

University of Freiburg

Dates

Collected
2025-01-01/2025-12-31