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CH-DAV / EFDC-ID20210630

  • Updated fluxes for FLUXNET data sharing.
  • These fluxes were prepared specifically for the FLUXNET / EFDC upload for the full (incl. full 2020 data) Warm Winter 2020 dataset.
  • IRGA75 fluxes were corrected for self-heating following a refined approach based on Kittler et al. (2017). Details can be found on the server.
  • Level-1 (IRGA62, IRGA75, IRGA72) and Level-1.1 (IRGA75 only) fluxes are available as part of the EFDC upload on the grasslandserver here:
    • /mnt/gl-processing/CH-DAV_Davos/95_database_submissions/2021_submitted_to_EFDC/2021-06-30_updatedFluxes_2005-2016
  • Level-2, Level-3 and Level-4 fluxes are produced by FLUXNET.

 

Upload for FLUXNET / EFDC Data Sharing

All years where IRGA75 data were available were re-uploaded for FLUXNET data sharing. No new Level-1 fluxes were uploaded for 1997-2004 and 2017-2020.

IRGA75 Level-1.1 fluxes (corrected for self-heating, 2005-2016) were combined with IRGA72 Level-1 fluxes (2013-2016). To upload a complete yearly file also for 2005, the IRGA75 fluxes were combined with the IRGA62 Level-1 (2005) fluxes.

IRGA75 Level-1.1 fluxes (2005-2016, corrected for self-heating)

  • Quality check: Rejected CO2 and LE flux values where AGC > 90 (bad quality)
  • Preparation for merging with IRGA72 and IRGA62 data:
    • This is necessary so that records from the different IRGAs match after merging data from IRGA75 with IRGA72 during the years of parallel measurements (2013-2016)
    • For CO2, keep storage, mole fraction and SSITC flag where we have CO2 flux available
    • For LE, keep storage, H2O mole fraction and SSITC flag where we have LE flux available
    • For H, keep storage and SSITC flag where we have H flux available
  • Rename variables to FLUXNET Requirements

IRGA62 Level-1 fluxes (2005)

  • No additional quality check

IRGA72 Level-1 fluxes (2012-2016)

  • Quality check:
    • No additional check, signal strength is good. In 2012 and 2013, low values for signal strength translates to good signal.
  • Preparation for merging with IRGA72 data:
    • This is necessary so that records from the different IRGAs match after merging data from IRGA75 with IRGA72 during the years of parallel measurements (2012-2016)
    • For CO2, keep storage, mole fraction and SSITC flag where we have CO2 flux available
    • For LE, keep storage, H2O mole fraction and SSITC flag where we have LE flux available
    • For H, keep storage and SSITC flag where we have H flux available
    • Rename variables to FLUXNET Requirements

Merging IRGA72+IRGA75+IRGA62

  • Datasets were combined into one merged dataset (2005-2016)
  • IRGA72 fluxes were prioritized in overlapping years (2013-2016), gaps were filled with IRGA75 fluxes (if available for the IRGA72 gap), IRGA62 fluxes for 2005 were added
  • After checking the full time series, the IRGA72 water fluxes in 2013 and 2014 were clearly lower than from the IRGA72 during the same time period. It is possible that during these very first IRGA72 years H2O fluxes were not perfect. Therefore, for 2013-2014, IRGA75 data were used for LE, SLE, LE_SSITC_TEST and H2O.
  • Exported each year to separate file with yearly range (2005-2016)
  • Uploaded yearly files to EFDC / FLUXNET (9 Jun 2021)

 

 

Dataset Production

For info about the flux processing chain and flux levels see:: Flux Processing Chain

Software

  • EddyPro v6 and v7 for flux calculations (links to details of Level-1 fluxes are given below for each year)
  • BICO for the conversion of binary raw data files to ASCII (2013-2016)
  • FLUXRUN for the flux calculation using EddyPro (2013-2016)
  • Various versions of FCT (flux calculation using EddyPro) were used for years 1997-2004, details are given in the section Used Flux Versions below
  • SCOP v0.1 for the self-heating correction of IRGA75 fluxes
  • DIIVE v0.21.0 for file merging, quality control

 

Meteo Data

NABEL (empa) data (1997-2020) was merged with meteo data from the FLUXNET Drought Study dataset (1997-2020.06)

  • TA (NABEL, 35m, prioritized) merged with TA_F (FLUXNET)
  • SW_IN (NABEL, 35m, prioritized) was merged with SW_IN_F (FLUXNET)
  • RH (NABEL, 35m, prioritized) was merged with RH (FLUXNET)
  • VPD_F (FLUXNET)

 

Used Flux Versions

2005: IRGA62

  • 2005 R2-IRGA62-IRGA75_FF-201606 / Level-1_ID2016-07-28T143836 (IRGA62 fluxes)

 

2005-2016: R350-IRGA75

  • 2005 R2-IRGA62-IRGA75_FF-201606 / Level-1_ID2016-07-28T143836 (IRGA75 fluxes)
  • 2006 R2-R350-IRGA75_FF-201606 / Level-1_ID2016-06-03T151158
  • 2007 R350-IRGA75_FF-201606 / Level-1_ID2016-06-01T145942
  • 2008 R350-IRGA75_FF-201606 / Level-1_ID2016-05-30T161917
  • 2009 R350-IRGA75_FF-201606 / Level-1_ID2016-05-30T161726
  • 2010 R350-IRGA75_FF-201606 / Level-1_ID2016-05-29T160744
  • 2011 R350-IRGA75_FF-201606 / Level-1_ID2016-05-29T160603
  • 2012 R350-IRGA75_FF-201606 / Level-1_ID2016-06-06T173342 (IRGA75 fluxes)
  • 2013 R350-IRGA72-IRGA75_FF-202101 / Level-1_ID2021-05-01T120000 (IRGA75 fluxes)
  • 2014 R350-HS50-IRGA72-IRGA75_FF-202101 / Level-1_ID2021-05-02T120000 (IRGA75 fluxes)
  • 2015 R350-HS50-IRGA72-IRGA75_FF-202101 / Level-1_ID2021-05-03T230000 (IRGA75 fluxes)
  • 2016 R350-HS50-IRGA72-IRGA75_FF-202101 / Level-1_ID2021-05-02T230000 (IRGA75 fluxes)

 

2013-2016: HS50-IRGA72

  • 2012 R350-IRGA75_FF-201606 / Level-1_ID2016-06-06T173342 (IRGA72 fluxes)
  • 2013 R350-IRGA72-IRGA75_FF-202101 / Level-1_ID2021-05-01T120000 (IRGA72 fluxes)
  • 2014 R350-HS50-IRGA72-IRGA75_FF-202101 / Level-1_ID2021-05-02T120000 (IRGA72 fluxes)
  • 2015 R350-HS50-IRGA72-IRGA75_FF-202101 / Level-1_ID2021-05-03T230000 (IRGA72 fluxes)
  • 2016 R350-HS50-IRGA72-IRGA75_FF-202101 / Level-1_ID2021-05-02T230000 (IRGA72 fluxes)

 

Last Updated on 18 Feb 2024 21:55