uid=MCM,o=EDI,dc=edirepository,dc=org all public read HODM High frequency measurements from Howard Glacier Meteorological Station (HODM), McMurdo Dry Valleys, Antarctica (1993-2022, ongoing) Peter Doran pdoran@lsu.edu https://www.lsu.edu/science/geology/people/faculty/doran.php https://orcid.org/0000-0002-3774-2847 Andrew Fountain
P.O. Box 751 Portland OR 97207 US
(503) 725-3386 andrew@pdx.edu http://glaciers.pdx.edu/fountain/ https://orcid.org/0000-0001-5299-2273
McMurdo Dry Valleys LTER http://mcmlter.org/ Krista Myers field technician Renée Brown rfbrown@unm.edu https://orcid.org/0000-0002-4986-7663 data manager Maciej Obryk
Cascades Volcano Observatory Vancouver WA 98683 US
maciej.obryk@gmail.com https://orcid.org/0000-0002-8182-8656 former field crew
Hassan Basagic basagic@gmail.com former field crew Thomas Nylen thomasnylen@gmail.com https://orcid.org/0000-0001-9579-8702 former field crew Inigo San Gil
Department of Biology, MSC03 2020 University of New Mexico Albuquerque NM 87131 US
(505) 277-2625 (505) 277-2541 isangil@lternet.edu former data manager
2023-07-08 English
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.
air temperature climate climatology ice meteorology relative humidity solar radiation wind wind direction wind speed LTER Controlled Vocabulary air temperature glacier ice ice temperature ice thickness meteorology relative humidity RH temperature wind wind direction wind speed Station Keywords disturbance LTER Core Areas
Data Policies This data package is released under the Creative Commons Attribution 4.0 International License (CC BY 4.0; http://creativecommons.org/licenses/by/4.0/), which allows consumers (hereinafter referred to as “Data Users”) to freely reuse, redistribute, transform, or build on this work (even commercially) so long as appropriate credit is provided. Accordingly, Data Users are required to properly cite this data package in any publications or in the metadata of any derived products that result from its use (in whole or in part). A recommended citation is provided on the summary metadata page associated with this data package in the McMurdo Dry Valleys LTER Data Catalog (https://mcmlter.org/data), and a generic citation may be found on the summary metadata page in the repository where this data package was obtained. When these data contribute significantly to the contents of a publication, Data Users must also acknowledge that data were provided by the NSF-supported McMurdo Dry Valleys Long Term Ecological Research program (OPP-1637708). This data package has been released in the spirit of open scientific collaboration. Hence, Data Users are strongly encouraged to consider consultation, collaboration, and/or co-authorship (as appropriate) with the data package creator(s). Data Users should be aware these data may be actively used by others for ongoing research; thus, coordination may be necessary to prevent duplicate publication. Data Users should also recognize that misinterpretation of data may occur if they are used outside the context of the original study. Hence, Data Users are urged to contact the data package creator(s) if they have any questions regarding methodology or results. While substantial efforts are made to ensure the accuracy of this data package (with all its components), complete accuracy cannot be guaranteed. Periodic updates to this data package may occur, and it is the responsibility of Data Users to check for new versions. This data package is made available “as is” and comes with no warranty of accuracy or fitness for use. The creator(s) of this data package and the repository where these data were obtained shall not be liable for any damages resulting from misinterpretation, use, or misuse of these data. Finally, as a professional courtesy, we kindly request Data Users notify the primary contact referenced in the metadata when these data are used in the production of any derivative work or publication. Notification should include an explanation of how the data were used, along with a digital copy of the derived product(s). Thank you.
https://mcm.lternet.edu/content/high-frequency-measurements-howard-glacier-meteorological-station-hodm-mcmurdo-dry-valleys 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 465 465 meter 1993-11-20 2022-12-19 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  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. McMurdo Dry Valleys LTER Information Manager im@mcmlter.org McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER
  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    
 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.  
HODM_AIRT HODM - Air Temperature mcmlter-clim-hodm_airt-15min-20230706.csv 43481270 1 1 \n column , " https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_airt-15min-20230706.csv DATASET_CODE DATASET_CODE Code for given set of information for Howard Glacier meteorology station string Code for given set of information for Howard Glacier meteorology station METLOCID METLOCID Location code for Howard Glacier meteorology station string Location code for Howard Glacier meteorology station DATE_TIME DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) date MM/DD/YYYY HH24:MI AIRT1M AIRT1M Average air temperature at 1 m above ground celsius 0.01 real -70 15 Null None given AIRT3M AIRT3M Average air temperature at 3 m above ground celsius 0.01 real -70 15 Null None given AIRTMAX AIRTMAX Maximum air temperature at 2.5 - 3 m above ground celsius 0.01 real -70 15 Null None given AIRTMIN AIRTMIN Minimum air temperature at 2.5 - 3 m above ground celsius 0.01 real -70 15 Null None given AIRT_COMMENTS air temperature comments Noted comments by the investigator about the particular measure of air temperature string Noted comments by the investigator about the particular measure of air temperature HODM_ICESURFCHANGE HODM - Ice Surface Change mcmlter-clim-hodm_icesurfchange-15min-20230706.csv 30574377 1 1 \n column , " https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_icesurfchange-15min-20230706.csv DATASET CODE DATASET CODE Code for given set of information for Commonwealth Glacier meteorology station string Code for given set of information for Commonwealth Glacier meteorology station METLOCID METLOCID Location code for Commonwealth Glacier meteorology station string Location code for Commonwealth Glacier meteorology station DATE_TIME DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) date MM/DD/YYYY HH:MI ICESURFCHANGE_CM ICESURFCHANGE_CM Elevation of ice surface measured from fixed datum (Elevation of ice surface referenced to 0 at the time of installation) centimeter 0.1 real Null None given ICESURFCHANGE_COMMENTS ICESURFCHANGE_COMMENTS Noted comments by the investigator about the particular measure of DEPTH_ string Noted comments by the investigator about the particular measure of DEPTH_ DIST_TO_SURFACE Distance to surface the distance between the sensor and the surface in meters meter 0.4 real Null None given HODM_RADN HODM - Solar Radiation mcmlter-clim-hodm_radn-15min-20230706.csv 63548425 1 1 \n column , " https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_radn-15min-20230706.csv DATASET_CODE DATASET_CODE Code for given set of information for Howard Glacier meteorology station string Code for given set of information for Howard Glacier meteorology station METLOCID METLOCID Location code for the Howard glacier meteorology station - HODM string Location code for the Howard glacier meteorology station - HODM DATE_TIME Date/time Date/time of sample (McMurdo time) date MM/DD/YYYY HH24:MI LWRADIN LWRADIN Incoming longwave radiation based on applying instrument-specific multiplier W/m2 0.1 real -5 400 Null None given SWRADIN SWRADIN Incoming shortwave radiation/solar flux W/m2 0.1 real Null None given SWRADOUT SWRADOUT Outgoing shortwave radiation/solar flux W/m2 0.1 real Null None given RADN_COMMENTS radiation comments Noted comments by the investigator about the particular measure of radiation string Noted comments by the investigator about the particular measure of radiation HODM_RH HODM - Relative Humidity mcmlter-clim-hodm_rh-15min-20230706.csv 39911486 1 1 \n column , " https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_rh-15min-20230706.csv DATASET_CODE DATASET_CODE Code for given set of information for Howard Glacier meteorology station string Code for given set of information for Howard Glacier meteorology station METLOCID METLOCID Location code for Howard Glacier meteorology station string Location code for Howard Glacier meteorology station DATE_TIME DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) date MM/DD/YYYY HH24:MI RH RH The Relative Humidity, the percentage of water contained in the air dimensionless real 100 0 NULL See RH_COMMENTS for missing value explanation RH1M RH1M Relative humidity at 1 meter percent 0.1 real Null See RH_COMMENTS column value for explanation on missing values RH_COMMENTS relative humidity comments Noted comments by the investigator about the particular measure of relative humidity string Noted comments by the investigator about the particular measure of relative humidity HODM_WIND HODM - Wind Direction and Speed mcmlter-clim-hodm_wind-15min-20230706.csv 52255299 1 1 \n column , " https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-hodm_wind-15min-20230706.csv DATASET_CODE DATASET_CODE Code for given set of information for Howard Glacier meteorology station string Code for given set of information for Howard Glacier meteorology station METLOCID METLOCID Location code for Howard Glacier meteorology station string Location code for Howard Glacier meteorology station DATE_TIME DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) date MM/DD/YYYY HH24:MI WDIR WDIR Average wind direction degreesfromnorth 0.1 real 0 360 Null See WIND_COMMENTS for missing value explanation WDIRSTD WDIRSTD Standard deviation of wind direction degreesfromnorth 0.1 real 0 Null See WIND_COMMENTS for missing value explanation WSPD WSPD Wind speed metersPerSecond 0.1 real 0 Null See WIND_COMMENTS for missing value explanation WSPDMAX WSPDMAX Maximum wind speed metersPerSecond 0.1 real 0 Null See WIND_COMMENTS for missing value explanation WSPDMIN WSPDMIN Minimum wind speed metersPerSecond 0.1 real 0 Null See WIND_COMMENTS for missing value explanation WIND_COMMENTS WIND_COMMENTS Noted comments by the investigator about the particular measure of WIND_ string Noted comments by the investigator about the particular measure of WIND_ HODM_ICET HODM - Ice Temperature HODM_ICET.csv 38325805 27 1 \n column , " https://mcm.lternet.edu/sites/default/files/data/HODM_ICET.csv
see task list
IceT @ 20cm: 1993-1994 - 2002-2003: Campbell Scientific 107B temperature probe IceT @ 50cm: 2002-2003 - present: Fenwall Thermisters (192-102DEW-A01) and Caddock Tetrinox(TF050N) hi precision resistor (10Kohm) with +-5ppm/celcius and 0.01percent Resistor IceT @ 1m: 1993-1994 - 2002-2003: Campbell Scientific 107B temperature probe IceT @ 1m: 2002-2003 - present: Fenwall Thermisters (192-102DEW-A01) and Caddock Tetrinox(TF050N) hi precision resistor (10Kohm) with +-5ppm/celcius and 0.01percent Resistor
DATASET_CODE DATASET_CODE Code for given set of information for Howard Glacier meteorology station string Code for given set of information for Howard Glacier meteorology station METLOCID METLOCID Location code for Howard Glacier meteorology station string Location code for Howard Glacier meteorology station DATE_TIME DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) date MM/DD/YYYY HH24:MI ICET20CM ICET20CM Ice temperature at 20 cm depth celsius 0.01 real -70 0 Null None given ICET1M ICET1M Ice temperature at 1 meter depth celsius 0.01 real -70 0 Null None given ICET_COMMENTS ICET_COMMENTS Noted comments by the investigator about the particular measure of ICET_ string Noted comments by the investigator about the particular measure of ICET_ ICET50CM ICET50CM Ice temperature at 50 cm depth celsius 0.01 real Null None given
HODM_WVAPD HODM - Water Vapor Density HODM_WVAPD.csv 846520 27 1 \n column , " https://mcm.lternet.edu/sites/default/files/HODM_WVAPD.csv DATASET_CODE DATASET_CODE Code for given set of information for Howard Glacier meteorology station string Code for given set of information for Howard Glacier meteorology station METLOCID METLOCID Location code for Howard Glacier meteorology station string Location code for Howard Glacier meteorology station DATE_TIME DATE_TIME Date/time of sample (New Zealand DST, +13 UTC) date MM/DD/YYYY HH24:MI WVAPD WVAPD Water Vapor Density gramspercubicmeter 0.1 real Null None given WVAPD_COMMENTS WVAPD_COMMENTS Noted comments by the investigator about the particular measure of WVAPD_ string Noted comments by the investigator about the particular measure of WVAPD_
ratio of two quantities as percent composition (1:100)