| Data Tables, Images, and Other Entities: |
| Data Table: | Air_Temperature_Units
View Table Metadata
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| Data Table: | File_and_Record_Numbers
View Table Metadata
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| Data Table: | Ice_Temperature_Units
View Table Metadata
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| Data Table: | Solar_Radiation_Units
View Table Metadata
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| Data Table: | Relative_Humidity_Units
View Table Metadata
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| Data Table: | Wind_Measurement_Units
View Table Metadata
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| Data Table: | Water_Vapor_Density_Units
View Table Metadata
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Short Name: | howard_met |
| Online Distribution Info: |
| Schema Name: | http://www.mcmlter.org/queries/met_results.jsp |
| Description: |
| You can build your own query for all the data in this station using the URL http://www.mcmlter.org/queries/met_results.jsp
and the described parameters, or you can just visit the URL http://www.mcmlter.org/queries/met_queries.jsp and simply use the form to build your own
metereology query from any McMurdo Dry Valleys Metereological station |
| Here is an example to query for the barometric pressure from March 1998 to April 2000 at Lake Hoare:
http://www.mcmlter.org/queries/met_results.jsp?begDate=03/01/1998&endDate=04/01/2000&mask=MM/DD/YYYY%20HH24:Mi&metStation=HOEM&dataType=PRESSTA |
| variable (dataType) abbreviations list for Howard Glacier station - HODM |
RH (relative humidity at 3m)
AIRT (air temperature)
WIND (wind speed, direction, etc)
RADN (radiation)
ICET (ice temperature)
WVAPD (Water vapor density)
FLINE (file and record numbers)
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| begDate: |
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| Desired begin date for the data, use format MM/DD/YYYY |
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| endDate: |
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| Desired End Date for the data query |
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| mask: |
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| Associated Date format for the data record.(I.e, a mask value that works here is
MM/DD/YYYY HH24:Mi or - decimal - for a decimal year) |
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| metStation: |
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| Code Name for the metereological station from which the data is asked, for this station is howard - HODM |
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| dataType: |
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| variable abbreviation for the parameter of interest, such as wind speed or air temperature. For a list of the used abbreviations, see the description section above |
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| Data Set Owner(s): |
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Individual: | Andrew G. Fountain |
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Address: |
| Department of Geology, |
| 17 Cramer Hall, |
| 1721 SW Broadway, |
| Portland State University, |
| Portland, OR 97207-0751 USA |
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Phone:
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Email Address:
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| Metadata Provider(s): |
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Organization: | McMurdo Dry Valleys LTER |
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Address: |
| Byrd Polar Research Center, |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, OH 43210-1002 USA |
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Phone:
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Phone:
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Email Address:
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| Associated Party: |
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Individual: | Hassan Basagic |
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Address: |
| Department of Geology, |
| Portland State University, |
| Portland, OR 97207-0751 USA |
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Email Address:
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Role:
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| Abstract: |
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As part of the Long Term Ecological Research in the
McMurdo Dry Valleys of Antarctica, meteorological data was collected from various locations
throughout Taylor, Wright and Victoria Valleys. These files contain data for the Howard Glacier
meteorology station (in Taylor Valley).
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| Keywords: |
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- meteorology
(theme)
- temperature
(theme)
- air temperature
(theme)
- ice temperature
(theme)
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| Additional Information: |
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| Comments |
Meteorological data is collected year-round at each of the stations in the McMurdo Dry Valleys of Antarctica.
After retrieving this data (usually every January), the parameters that are recorded are processed from level 0 (raw) to level
1 (processed, provided on the web). The
raw data file descriptions and task lists summarize what was done to get from level 0 to level 1 for all station found at the following address:
http://www.mcmlter.org/data/meteorology/tasks/task_lists.htm
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| Citations |
Doran, Peter T., Gayle L. Dana, Jordan T. Hastings and Robert A. Wharton, Jr. 1995.
McMurdo Dry Valleys Long-Term Ecological Research (LTER): LTER automatic weather network (LAWN).
Antarctic Journal of the U.S. 30(5): 276-280.
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| Notes |
Data contained in these files has been subjected to quality
control standards imposed by the investigator. The user of this data should be
aware that, while efforts have been taken to ensure that these data are of the
highest quality, there is no guarantee of perfection for the data contained
herein and the possibility of errors exists. If you encounter questionable data,
please contact the MCM LTER data manager (telephone: 303-492-4639) so that the
data can be corrected or qualified. Thus, these data may be modified and future
data will be appended.
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| License and Usage Rights: |
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| MCM LTER data may be used freely with the following restrictions: |
The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.A copy of any resultant publications should be sent to the McMurdo data manager and principal investigator.The end-user follow the guidelines set forth in the LTER Network Data Access Policy, Data Access Requirements, and General Data Use Agreement found at http://www.mcmlter.org/data_guidelines.htm
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| Geographic Coverage: |
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Geographic Description: | The Howard Glacier meteorology station is
located at a latitude of 77 44.83507 S, a longitude of 163 4.747251167 E,
and an elevation of 472.49343 meters above sea level. Descriptions of this and other
McMurdo Dry Valley meteorology stations can be found at
http://www.mcmlter.org/data/meteorology/locations/metlocs.html. |
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Bounding Coordinates:
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| West: | 163.07913 degrees
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| East: | 163.07912 degrees
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| North: | -77.74725 degrees
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| South: | -77.74726 degrees
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Mimimum Altitude: | 473 meter |
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Maximum Altitude: | 472 meter |
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| Temporal Coverage: |
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Begin:
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End:
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| Maintenance: |
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Description:
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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.
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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 HODM dataset for the date range 1/16/2003 16:15 - 12/21/2005 23:45 (103,711 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.
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Frequency:
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| Contact: |
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Organization: | McMurdo Dry Valleys LTER |
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Position: | Data Manager |
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Address: |
| Byrd Polar Research Center, |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, OH 43210-1002 USA |
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Phone:
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Email Address:
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| Publisher: |
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Organization: | McMurdo Dry Valleys LTER |
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Address: |
| Byrd Polar Research Center, |
| 108 Scott Hall, |
| 1090 Carmack Rd, |
| Columbus, OH 43210-1002 USA |
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Phone:
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| Methods Info: |
| Step 1: |
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Description:
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| 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,
longitide 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. |
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Sampling Coverage:
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| Geographic Coverage: |
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Geographic Description: | The Howard Glacier meteorology station is
located at a latitude of 77 44.83507 S, a longitude of 163 4.747251167 E,
and an elevation of 472.49343 meters above sea level. Descriptions of this and other
McMurdo Dry Valley meteorology stations can be found at
http://www.mcmlter.org/data/meteorology/locations/metlocs.html. |
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Bounding Coordinates:
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| West: | 163.07913 degrees
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| East: | 163.07912 degrees
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| North: | -77.74725 degrees
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| South: | -77.74726 degrees
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Mimimum Altitude: | 473 meter |
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Maximum Altitude: | 472 meter |
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Sampling Description:
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| Sampling and Averaging Intervals |
For Sampling frequency and Data Logger output and averaging intervals please visit:
http://www.mcmlter.org/data/meteorology/methods/Interval_Dates.pdf
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| Seasonal Task Summary |
To view the data post-processing steps for each season please visit:
http://www.mcmlter.org/data/meteorology/tasks/task_lists.htm
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