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: Renée 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