FRLM_MONTHLY English utf8 dataset McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact 2019-08-14 ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions ISO 19115-2:2009(E) Monthly measurement summaries from Lake Fryxell Meteorological Station (FRLM), McMurdo Dry Valleys, Antarctica (1993-2022, ongoing) 2019-08-14 publication Peter Doran Louisiana State University http://lsu.edu pdoran@lsu.edu https://www.lsu.edu/science/geology/people/faculty/doran.php pointOfContact Andrew Fountain Portland State University http://www.pdx.edu (503) 725-3386 P.O. Box 751 Portland OR 97207 US andrew@pdx.edu http://glaciers.pdx.edu/fountain/ pointOfContact documentDigital As part of the McMurdo Dry Valleys Long Term Ecological Research program, meteorological data are collected from various locations throughout the McMurdo Dry Valleys of Antarctica. This data package contains monthly measurement summaries derived from 15-minute data generated by the Lake Fryxell Meteorological Station (FRLM), located in Taylor Valley. BOYM was established in 1993, during the 93/94 field season. Name: Krista F. Myers Role: field technician Name: RenĂ©e F. Brown Role: data manager Name: Maciej K. Obryk Role: former field crew Name: Hassan Basagic Role: former field crew Name: Thomas Nylen Role: former field crew Name: Inigo San Gil Role: former data manager completed McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact disturbance theme LTER Core Areas English Located on small island in Lake Fryxell.ID: FRLM 163.170100000000 163.170100000000 -77.611300000000 -77.611300000000 ground condition 1993-12-01 2022-12-31 Meteorological data are collected year-round at each of MCM LTER stations. Data are manually downloaded from the meteorological stations during the austral summer. Raw 15 minute data (Level 0) are processed and provided as Level 1 data on the MCM LTER website. Field notes, sensor information, processing procedures, QA/QC, and metadata are provided in the Meteorological Post Processing Documentation and Task Lists for each field season at the following address: https://mcm.lternet.edu/meteorological-task-lists https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_airt-monthly-20230605.csv FRLM_AIRT_MONTHLY eng; US McMurdo Dry Valleys LTER FRLM_AIRT_MONTHLY Data Source Definition : FRLM - Air Temperature (Monthly) Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Field Delimiter : , false METLOCID Location code for this met station DATE_TIME Date sample was collected Date Time Format: mm/dd/yyyy AVG_AIRT3M Average air temperature at 3 m above ground STD_AIRT3M Standard deviation for the air temperature at 3 m above ground MIN_AIRT3M Minimum value of the air temperature at 3 m above ground MAX_AIRT3M Maximum value for the air temperature at 1.3 m above ground N_AIRT3M Number of observations for this average AVG_AIRTDEL3M1 Average of air temperature at 3 m minus air temperature at 1 m STD_AIRTDEL3M1 Standard deviation of the air temperature distribution at 3 m minus air temperature at 1 m MIN_AIRTDEL3M1 Minimum value of the air temperature at 3 m minus air temperature at 1 m MAX_AIRTDEL3M1 Maximum of the air temperature at 3 m minus air temperature at 1 m N_AIRTDEL3M1 Number of observations of the air temperature at 3 m minus air temperature at 1 meter above ground used for these statistics N_COMMENTS Number of comments about the measurement in this period DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_airt-monthly-20230605.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_radn-monthly-20230605.csv FRLM_RADN_MONTHLY eng; US McMurdo Dry Valleys LTER FRLM_RADN_MONTHLY Data Source Definition : FRLM - Solar Radiation (Monthly) Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Field Delimiter : , false METLOCID Location code for this met station DATE_TIME Date sample was collected Date Time Format: mm/dd/yyyy AVG_PAR Average photosynthetically active radiation (PAR). STD_PAR Standard deviation for the photosynthetically active radiation (PAR). MIN_PAR Minimum value of the photosynthetically active radiation (PAR). MAX_PAR Maximum value for the photosynthetically active radiation (PAR). N_PAR Number of observations for the photosynthetically active radiation (PAR) statistics AVG_SWRADIN Average for the short wave incoming radiation STD_SWRADIN Standard deviation for the short wave incoming radiation MIN_SWRADIN Minimum value of the short wave incoming radiation MAX_SWRADIN Maximum incoming shortwave radiation based on applying instrument-specific multiplier N_SWRADIN Number of data records included for the statistics AVG_SWRADOUT Average for the short wave outbound radiation STD_SWRADOUT standard devation of the the short wave outbound radiation MIN_SWRADOUT Minimum the short wave outbound radiation MAX_SWRADOUT Maximum soil temperature at 10 cm depth N_SWRADOUT Number of observations the short wave outbound radiation N_COMMENTS Number of comments about the measurement in this period DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_radn-monthly-20230605.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_rh-monthly-20230605.csv FRLM_RH_MONTHLY eng; US McMurdo Dry Valleys LTER FRLM_RH_MONTHLY Data Source Definition : FRLM - Relative Humidity (Monthly) Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Field Delimiter : , false METLOCID Location code for this met station DATE_TIME Date sample was collected Date Time Format: mm/dd/yyyy AVG_RH Average of the relative humidity values STD_RH The standard deviation for the distribution of daily rel. humidity values MIN_RH The minimum of the relative humidity MAX_RH The maximum of the relative humidity N_RH Number of observations for the daily stats. N_COMMENTS Number of comments about the measurement in this period DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_rh-monthly-20230605.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_soilt-monthly-20230605.csv FRLM_SOILT_MONTHLY eng; US McMurdo Dry Valleys LTER FRLM_SOILT_MONTHLY Data Source Definition : FRLM - Soil Temperature (Monthly) Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Field Delimiter : , false METLOCID Location code for this met station DATE_TIME Date sample was collected Date Time Format: mm/dd/yyyy AVG_SOILT0CM Average soil temperature at ground STD_SOILT0CM Standard deviation for the soil temperature at suface ground MIN_SOILT0CM Minimum value of the soil temperature at surface ground MAX_SOILT0CM Maximum value for the air temperature at 3 m above ground N_SOILT0CM Number of observations for this average AVG_SOILT5CM Average soil temperature at 5cm below ground STD_SOILT5CM Standard deviation for the soil temperature at 5cm below ground MIN_SOILT5CM Minimum value of the soil temperature at 5cm below ground MAX_SOILT5CM Maximum soil temperature at 5 cm depth N_SOILT5CM Number of observations for this average AVG_SOILT10CM Average soil temperature at 10 cm depth STD_SOILT10CM standard devation of the soil temperature at 10 cm depth MIN_SOILT10CM Minimum soil temperature at 10 cm depth MAX_SOILT10CM Maximum soil temperature at 10 cm depth N_SOILT10CM Number of observations used to compute these statistics N_COMMENTS Number of comments about the measurement in this period DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_soilt-monthly-20230605.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_surf-monthly-20230605.csv FRLM_SURF_MONTHLY eng; US McMurdo Dry Valleys LTER FRLM_SURF_MONTHLY Data Source Definition : FRLM - Ice Surface Change (Monthly) Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Field Delimiter : , false METLOCID Location code for this met station DATE_TIME Date sample was collected Date Time Format: mm/dd/yyyy AVG_SURFELEVCHANGE Average surface change - snowfall / sediment accumulation or loss STD_SURFELEVCHANGE Standard deviation for the surface change - snowfall / sediment accumulation or loss MIN_SURFELEVCHANGE Minimum value of the surface change - snowfall / sediment accumulation or loss MAX_SURFELEVCHANGE Maximum value for the surface - snowfall / sediment accumulation or loss N_SURFELEVCHANGE Number of observations for this average N_COMMENTS Number of comments about the measurement in this period DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_surf-monthly-20230605.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_wspd-monthly-20230605.csv FRLM_WSPD_MONTHLY eng; US McMurdo Dry Valleys LTER FRLM_WSPD_MONTHLY Data Source Definition : FRLM - Wind Speed (Monthly) Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Field Delimiter : , false METLOCID METLOCID identification code for the meteorological station DATE_TIME Date when measurement was taken Date Time Format: DD/MM/YYYY AVG_WSPD Average of the daily values of the wind speed STDDEV_WSPD Standard deviation of the daily distribution of the wind speed MIN_WSPD Minimum value of the wind speed for the period of one day MAX_WSPD Maximum value of the wind speed for the period of one day N_WSPD Number of data points used to calculate these statistics. N_COMMENTS Number of comments about the measurement in this period DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-frlm_wspd-monthly-20230605.csv dataset When the McMurdo Dry Valley LTER project began in December, 1993, a lake-ice meteorology station was already set up at Lake Fryxell. It was a 6 foot tower built by Rich Harnish in ~1989, but had not collected data for at least a year. Peter Doran, noting that the problem was power related (since the battery was under water and the voltage was less than 5), righted the station, and rebuilt it with new power supply, a new wind monitor, new CR10, new solar panel, and added a quantum sensor. The under water light sensors were not hooked up again nor was the barometric pressure sensor. The lake-ice station was operated from 7 December 1993 to 6 January 1994 (this lake-ice station is located in the same table as the Lake Fryxell shore station and is noted with the METLOCID=FRIM). At that time, it was decided that maintenance of the records at the site of the old Fryxell land station was more important than the ice station so the ice station was cannibalized to re-establish the Lake Fryxell shore station, (which had been destroyed by wind the previous winter (METLOCID=FRLM)). The station was based on a 6 foot tripod which set it apart from the other Taylor Valley stations, but a 10 foot tower was subsequently installed in year 2. The land station is located a few meters above the old site to avoid rising lake levels. On June 25, 2001 @ 0230 the station mast broke and blew over, breaking the wind monitor. Station was taken apart on November 16, 2001, with the sensors except wind temporally set up on what was left of the station. On November 27, 2001 the station was reconstructed and was made operational again. Mark all values from June to November as bad or questionable except the soil temperatures The station was set up to sample sensors every 30 seconds and send summary statistics (for example, averages and maximums) to solid-state storage modules every: 10 minutes from December 7, 1993 to January 6, 1994 and January 7, 1994 to January 12, 1994, three hours from January 6, 1994 to January 7, 1994 and January 12, 1994 to November 28, 1994, 20 minutes between November 28, 1994 and November 21, 1995, and 15 minutes thereafter. This has resulted in approximately 20 values being recorded for final storage in every output interval. Primary measurements made on Lake Fryxell meteorology station, instrumentation used, and time of initiation are shown in the following table: In 2007, it was realized that the RH error was still present in parts of the dataset. Hasan Basagic made the above corrections to the FRLM dataset for the date range 1/23/2004 11:15 - 12/21/2006 13:30 (102,058 records). In September, 2007 the information manager (Chris Gardner) removed all old RH data and re-inserted then newly calculated values and associated comments. The original files are archive in the 'submitted data' section of the mcmlter server. Sampling and Averaging Intervals For Sampling frequency and Data Logger output and averaging intervals please visit:http://mcmlter.ltenet.edu/data/meteorology/methods/Interval_Dates.pdf Metadata Access Constraints: none Metadata Use Constraints: none annually McMurdo Dry Valleys LTER http://mcmlter.org/ pointOfContact