##############################################################################
# Meteorological Data provided by
# Albert-Ludwigs-Universitaet Freiburg
# Institute of Earth and Environmental Sciences
# Chair of Environmental Meteorology
# Prof. Dr. Andreas Christen
# Werthmannstrasse 10, 79085 Freiburg, Germany
# meteo@meteo.uni-freiburg.de
##############################################################################

Station Name: Freiburg-Chemiehochhaus
Station ID: FRCHEM
Station Address: Albertstrasse 21, Freiburg im Breisgau, Germany
Station Longitude: 7.84861 deg E
Station Latitude: 48.0011 deg N
Station Elevation: 323.5 m
Variable: SolarIrradiance
Unit: W_m2
Height: 2m above roof level
Instrument/Source: Actively ventilated pyranometer (Kipp & Zonen CM21)

List of files
* FRCHEM_2020_SolarIrradiance_10min_UTC.csv
* FRCHEM_2020_SolarIrradiance_30min_UTC.csv
* FRCHEM_2020_SolarIrradiance_Hourly_UTC.csv
* FRCHEM_2020_SolarIrradiance_Daily_UTC.csv
* FRCHEM_2020_SolarIrradiance_Monthly_UTC.csv
* FRCHEM_2020_SolarIrradiance_Yearly_UTC.csv

Column descriptions: FRCHEM_2020_SolarIrradiance_10min_UTC.csv
* SolarIrradiance_Avg_W_m2 = 10min average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = 10min average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = 10min ratio of SolarIrradiance to modeled extraterrestrial irradiance
* SolarIrradiance_gap_filled_percent = fraction of 10min that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of 10min that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2020_SolarIrradiance_30min_UTC.csv
* SolarIrradiance_Avg_W_m2 = 30min average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = 30min average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = 30min ratio of SolarIrradiance to modeled extraterrestrial irradiance
* SolarIrradiance_gap_filled_percent = fraction of 30min that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of 30min that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2020_SolarIrradiance_Hourly_UTC.csv
* SolarIrradiance_Avg_W_m2 = hourly average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = hourly average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = hourly ratio of SolarIrradiance to modeled extraterrestrial irradiance
* SolarIrradiance_gap_filled_percent = fraction of hour that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of hour that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2020_SolarIrradiance_Daily_UTC.csv
* SolarIrradiance_Avg_W_m2 = daily average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = daily average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = daily ratio of SolarIrradiance to modeled extraterrestrial irradiance
* No_of_hours_with_max_SolarIrradiance_ge_5_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_hours_with_max_SolarIrradiance_ge_120_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 120 W_m2
* SolarIrradiance_gap_filled_percent = fraction of day that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of day that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2020_SolarIrradiance_Monthly_UTC.csv
* SolarIrradiance_Avg_W_m2 = monthly average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = monthly average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = monthly ratio of SolarIrradiance to modeled extraterrestrial irradiance
* No_of_hours_with_max_SolarIrradiance_ge_5_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_hours_with_max_SolarIrradiance_ge_120_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 120 W_m2
* No_of_days_with_max_SolarIrradiance_ge_5_W_m2 = Number of days with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_days_with_max_SolarIrradiance_ge_120_W_m2 = Number of days with a maximum SolarIrradiance greater equal 120 W_m2
* SolarIrradiance_gap_filled_percent = fraction of month that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of month that has missing data in %
* Error value: -9999

Column descriptions: FRCHEM_2020_SolarIrradiance_Yearly_UTC.csv
* SolarIrradiance_Avg_W_m2 = yearly average of SolarIrradiance in W_m2
* ExtraterrestrialIrradiance_Avg_W_m2 = yearly average of modeled extraterrestrial irradiance in W_m2
* Ratio_SolarIrradiance_to_ExtraterrestrialIrradiance = yearly ratio of SolarIrradiance to modeled extraterrestrial irradiance
* No_of_hours_with_max_SolarIrradiance_ge_5_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_hours_with_max_SolarIrradiance_ge_120_W_m2 = Number of hours with a maximum SolarIrradiance greater equal 120 W_m2
* No_of_days_with_max_SolarIrradiance_ge_5_W_m2 = Number of days with a maximum SolarIrradiance greater equal 5 W_m2
* No_of_days_with_max_SolarIrradiance_ge_120_W_m2 = Number of days with a maximum SolarIrradiance greater equal 120 W_m2
* SolarIrradiance_gap_filled_percent = fraction of year that was gap filled in %
* SolarIrradiance_missing_data_percent = fraction of year that has missing data in %
* Error value: -9999


Data processing details
Data between 2020-01-31T00:01:00Z and 2020-01-31T08:59:00Z [539 record(s)] filled using data from site HARTHM (GLOBAL_AVG)
Data between 2020-02-20T14:18:00Z and 2020-02-20T14:27:00Z [10 record(s)] filled using linear interpolation.
Data between 2020-02-26T10:50:00Z and 2020-02-26T10:50:00Z [1 record(s)] deleted due to unrealistic high values.
Data between 2020-02-26T10:50:00Z and 2020-02-26T10:50:00Z [1 record(s)] filled using linear interpolation.
Data between 2020-05-21T01:36:00Z and 2020-05-22T08:53:00Z [1878 record(s)] filled using data from site HARTHM (GLOBAL_AVG)
Data between 2020-06-30T09:22:00Z and 2020-06-30T09:32:00Z [11 record(s)] filled using linear interpolation.
Data between 2020-07-17T13:42:00Z and 2020-07-17T13:43:00Z [2 record(s)] deleted due to unrealistic high values.
Data between 2020-07-17T13:42:00Z and 2020-07-17T13:43:00Z [2 record(s)] filled using linear interpolation.
Data between 2020-08-04T09:02:00Z and 2020-08-04T09:02:00Z [1 record(s)] filled using linear interpolation.
No data filled using nearest neighbor.
Files created: Fri Nov 21 21:17:26 2025