HODM English utf8 dataset McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact 2014-11-05 ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions ISO 19115-2:2009(E) High frequency measurements from Howard Glacier Meteorological Station (HODM), McMurdo Dry Valleys, Antarctica (1993-2022, ongoing) 2014-11-05 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 package contains 15-minute data from the Howard Glacier Meteorological Station (HODM), located in Taylor Valley (Latitude: -77.67121, Longitude: 163.07732, Elevation: 472 meters above sea level). HODM was established in 1993, during the 93/94 field season. Meteorological data is collected year-round at each of MCM LTER stations. Data is manually downloaded from the meteorological stations during the austral summer. Raw 15 minute data (Level 0) is processed and provided as Level 1 data on the MCM LTER website. Field notes, sensor information, processing procedures, QA/QC, and metadata is 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  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 unknown Metadata standardized in 2007 by Gardner and San Gil.   Data and metadata was moved to DEIMS in 2014 (Inigo San Gil)   In 2022, an error was discovered with the 'icesurfchange' dataset and corrected as follows. Beginning 2018-11-27 15:00, values previously found in the 'icesurfchange_cm' column were moved to the 'dist_to_surface' column. disturbance theme LTER Core Areas English Meteorology station located at same coordinates as stake 31 on the Howard Glacier mass balance gridID:HODM 163.077300000000 163.077300000000 -77.671200000000 -77.671200000000 ground condition 1993-11-20 2022-12-19 https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_airt-15min-20230706.csv HODM_AIRT eng; US McMurdo Dry Valleys LTER HODM_AIRT Data Source Definition : HODM - Air Temperature Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET_CODE Code for given set of information for Howard Glacier meteorology station METLOCID Location code for Howard Glacier meteorology station DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) Date Time Format: MM/DD/YYYY HH24:MI AIRT1M Average air temperature at 1 m above ground AIRT3M Average air temperature at 3 m above ground AIRTMAX Maximum air temperature at 2.5 - 3 m above ground AIRTMIN Minimum air temperature at 2.5 - 3 m above ground AIRT_COMMENTS Noted comments by the investigator about the particular measure of air temperature DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_airt-15min-20230706.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_icesurfchange-15min-20230706.csv HODM_ICESURFCHANGE eng; US McMurdo Dry Valleys LTER HODM_ICESURFCHANGE Data Source Definition : HODM - Ice Surface Change Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET CODE Code for given set of information for Commonwealth Glacier meteorology station METLOCID Location code for Commonwealth Glacier meteorology station DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) Date Time Format: MM/DD/YYYY HH:MI ICESURFCHANGE_CM Elevation of ice surface measured from fixed datum (Elevation of ice surface referenced to 0 at the time of installation) ICESURFCHANGE_COMMENTS Noted comments by the investigator about the particular measure of DEPTH_ DIST_TO_SURFACE the distance between the sensor and the surface in meters DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_icesurfchange-15min-20230706.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_radn-15min-20230706.csv HODM_RADN eng; US McMurdo Dry Valleys LTER HODM_RADN Data Source Definition : HODM - Solar Radiation Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET_CODE Code for given set of information for Howard Glacier meteorology station METLOCID Location code for the Howard glacier meteorology station - HODM DATE_TIME Date/time of sample (McMurdo time) Date Time Format: MM/DD/YYYY HH24:MI LWRADIN Incoming longwave radiation based on applying instrument-specific multiplier SWRADIN Incoming shortwave radiation/solar flux SWRADOUT Outgoing shortwave radiation/solar flux RADN_COMMENTS Noted comments by the investigator about the particular measure of radiation DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_radn-15min-20230706.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_rh-15min-20230706.csv HODM_RH eng; US McMurdo Dry Valleys LTER HODM_RH Data Source Definition : HODM - Relative Humidity Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET_CODE Code for given set of information for Howard Glacier meteorology station METLOCID Location code for Howard Glacier meteorology station DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) Date Time Format: MM/DD/YYYY HH24:MI RH The Relative Humidity, the percentage of water contained in the air RH1M Relative humidity at 1 meter RH_COMMENTS Noted comments by the investigator about the particular measure of relative humidity DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_rh-15min-20230706.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_wind-15min-20230706.csv HODM_WIND eng; US McMurdo Dry Valleys LTER HODM_WIND Data Source Definition : HODM - Wind Direction and Speed Record Delimiter : \n Number of Header Lines : 1 Number of Footer Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET_CODE Code for given set of information for Howard Glacier meteorology station METLOCID Location code for Howard Glacier meteorology station DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) Date Time Format: MM/DD/YYYY HH24:MI WDIR Average wind direction WDIRSTD Standard deviation of wind direction WSPD Wind speed WSPDMAX Maximum wind speed WSPDMIN Minimum wind speed WIND_COMMENTS Noted comments by the investigator about the particular measure of WIND_ DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_wind-15min-20230706.csv https://mcm.lternet.edu/sites/default/files/data/HODM_ICET.csv HODM_ICET eng; US McMurdo Dry Valleys LTER HODM_ICET Data Source Definition : HODM - Ice Temperature Record Delimiter : \n Number of Header Lines : 27 Number of Footer Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET_CODE Code for given set of information for Howard Glacier meteorology station METLOCID Location code for Howard Glacier meteorology station DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) Date Time Format: MM/DD/YYYY HH24:MI ICET20CM Ice temperature at 20 cm depth ICET1M Ice temperature at 1 meter depth ICET_COMMENTS Noted comments by the investigator about the particular measure of ICET_ ICET50CM Ice temperature at 50 cm depth DBF https://mcm.lternet.edu/sites/default/files/data/HODM_ICET.csv https://mcm.lternet.edu/sites/default/files/HODM_WVAPD.csv HODM_WVAPD eng; US McMurdo Dry Valleys LTER HODM_WVAPD Data Source Definition : HODM - Water Vapor Density Record Delimiter : \n Number of Header Lines : 27 Number of Footer Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false DATASET_CODE Code for given set of information for Howard Glacier meteorology station METLOCID Location code for Howard Glacier meteorology station DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) Date Time Format: MM/DD/YYYY HH24:MI WVAPD Water Vapor Density WVAPD_COMMENTS Noted comments by the investigator about the particular measure of WVAPD_ DBF https://mcm.lternet.edu/sites/default/files/HODM_WVAPD.csv dataset Quality Control:  On September 3, 1999, at the request of Thomas Nylen, the data manager did some fine-tuning  of the data. This included:  1. Deletion of flags for ice temperature measurements from Nov 20, 1993 @ 16:30 to Dec  24, 1993 @ 14:30. Instruments were not installed during this time;  2. Removal and flagging of WDir values for measurements taken between Nov 23, 1994 @  10:20 and Jan 23, 1995 @ 13:20 where WSpd = 0. Since the wind speed values during  this time were flagged as bad, the original database query probably did not flag the WDir  data when WSpd =0.  In May 2000, the 1999-2000 data was posted. In the process, Denise Steigerwald changed the  layout of the files so that they were sorted by category (air temperatures, humidity, radiation,  wind etc.) rather than by year. Files containing monthly and daily averages were generated and  minor adjustments were made to the metadata.  On May 30, 2000, relative humidity (RH) values were corrected for a systematic error in the  measurement created by an instrument manufacturer error. All RH data with air temperatures  below freezing were corrected using the vapor pressure over ice (rather than over water which  was used initially). The error became quite large for very cold temperatures (the correction could  grow to around 30%). The formula used for the correction was:  RH_corr=RH_orig/((A*temp*temp)+(B*temp)+C)  where  RH_corr = corrected relative humidity  RH_orig = original relative humidity  temp = air temperature  A = 4.165E-5  B = 9.7E-3  C = 1.0  For example, with an air temperature of -2.3 and RH_orig of 50.6, the RH_corr will be 51.7.  Records that showed corrected RH values greater than or equal to 100 were changed to 99.99  and flagged.  In June 2000, summary files were added to the web containing daily and monthly statistics.  These were generated by creating "views" of daily and monthly means, minimums, maximums  and counts of the records represented in the Oracle database's meteorology tables.  On May 7, 2003, SwRadIn and SwRadOut values between 11/20/1993 4:30:00 PM and  11/23/1994 8:00:00 AM flagged as questionable because the values are significantly lower than  the other stations during the same time period. It appears the pyranometers were either tilted or  installed improperly. Also SwRadIn and SwRadOut values between 11/25/1997 @ 1445 and  01/10/1998 1430 because the wrong multiplier was used. The SwRadIn values were divided by  109.29 and multiplied by 115.61 and the SwRadOut were divided by 108.7 and multiplied by  116.41.  On June 29, 2004, wind direction between 11/20/1993 16:30 to 11/27/1995 15:00 was flagged  because the data is about +25 degrees off from the true direction. This was determined by  comparing the daily wind direciton over the entire 10 years of record. Additionally, between  11/27/1995 15:30 to 11/25/1997 13:30, the wind direction data was flagged because it is about -  10 degrees off from the true direction.     At the start of the 1993-1994 field season, the Howard Glacier meteorological station was constructed at the same coordinates as stake 31 on the glacier's mass balance grid (latitude of 77-40-17.36222 S, longitude of 163-04-44.83507 E, and elevation of 472.49343 meters above sea level).  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 20 minutes between November 20, 1993 and November 27, 1995, and every 15 minutes thereafter.  This has resulted in approximately 20 values being recorded for final storage in every output interval.     Sampling and Averaging Intervals         For Sampling frequency and Data Logger output and averaging intervals please visit:          http://mcmlter.lternet.edu/data/meteorology/methods/Interval_Dates.pdf     Metadata Access Constraints: none Metadata Use Constraints: none annually McMurdo Dry Valleys LTER http://mcmlter.org/ pointOfContact