| 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: | Barometric_Pressure_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: | Ice_Surface_Temperature_Units
View Table Metadata
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Short Name: | Canada_met |
| Online Distribution Info: |
| Schema Name: | http://www.mcmlter.org/queries/met_results.jsp |
| Description: |
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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
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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
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variable (dataType) abbreviations list for Canada Glacier Station - CAAM
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RH (relative humidity)
AIRT (air temperature)
WIND (wind speed, direction, etc)
RADN (radiation)
ICET (ice temperature)
PRESSTA (barometric pressure)
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 canada - CAAM |
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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 Commonwealth Glacier meteorology station (in Taylor Valley).
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| Keywords: |
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- glacier
(theme)
- meteorology
(theme)
- air temperature
(theme)
- ice temperature
(theme)
- solar flux
(theme)
- wind
(theme)
- humidity
(theme)
- barometric pressure
(theme)
- radiation
(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 Canada Glacier meteorology station is located
at a latitude of 77 48.42128 S, a longitude of 162 57.80702 E, and an
elevation of 264.42892 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: | 162.96345 degrees
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| East: | 162.96344 degrees
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| North: | -77.80701 degrees
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| South: | -77.80702 degrees
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Mimimum Altitude: | 265 meter |
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Maximum Altitude: | 264 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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Files were submitted by Karen Lewis to the McMurdo LTER data manager in October, 1997 and
March, 1999. In order to get the dates and times in the proper format, Denise Steigerwald
changed any times marked as 24:00 to 0:00, and added 1 to the corresponding julian date. Julian
dates and times were then converted to a format with mm/dd/yy hh24:mm in order to make this
file more compatible with other McMurdo LTER files. Variables were renamed to match with
corresponding measurements at other meteorology stations. A column was also added for
location code in order to identify the station of these measurements. Updates were done using
Microsoft Excel and Access software. Comma delimited ascii files were then generated to make
the data files available on the web page.
In June, 1999, it was determined that the transformations used to get records from level 0 to level
1 did not occur for the data sets submitted by Karen Lewis. Denise Steigerwald, the data
manager, therefore replaced what she could with data sets that originated at the Desert Research
Institute and had undergone these transformations. This included records between November 10,
1995 and August 21, 1996. The remaining records were downloaded by Thomas Nylen to allow
him to get the records to level 1. On September 29, 1999, the level 1 records on the web replaced
the level 0 records.
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 17, 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 June 4, 2004, the relative humidity (RH) values after January 16, 2000 @ 1600 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 polynomials used for the
correction is based on Lowe (1977). The original RH value is multiplied by the saturation vapor
pressure over water and divided by the the saturation vapor pressure over ice
RH3m_corr=[RH3m]*(6.107799961 + [AirT3m] * (0.4436518521 + [AirT3m] *
(0.01428945805 + [AirT3m] * (0.0002650648471 + [AirT3m] *(0.000003031240396 +
[AirT3m] * (0.00000002034080948 + 0.00000000006136820929 * [AirT3m])))))) /
(6.109177956 + [AirT3m] * (0.503469897 + [AirT3m] * (0.01886013408 + [AirT3m] *
(0.0004176223716 + [AirT3m] * (0.00000582472028 + [AirT3m] * (0.00000004838803174 +
0.0000000001838826904 * [AirT3m])))))))
Records that showed corrected RH values greater than or equal to 100 were changed to 99.99
and flagged.
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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 CAAM dataset for the date range 1/16/2000 16:15 - 1/28/2003 10:00 (106,249 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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On December 1, 1994, Gayle Dana established a summer-only
eddy correlation station on Canada Glacier. The station and program both
belonged to Scott Tyler at the Desert Research Institute (DRI) so they were
slightly different than the LTER standard. However, the station was set up to
monitor all of the standard meteorological parameters, as well as net radiation
and sensible and latent heat fluxes with the use of the eddy correlation sensors
during the summer. Information was gathered with a sampling frequency of every 1
second andamp; averaging & output interval of every 20 minutes using this
setup from December 1, 1994 to January 21, 1995.
On November 20, 1995, Karen Lewis established a permanent meteorology station
on Canada Glacier with eddy sensors. It was set up to sample sensors regularly
and send summary statistics (for example, averages and maximums) to solid-state
storage modules every:
15 minutes between November 20, 1995 and January 16, 1997,
15 minutes between January 12, 1998 and January 16, 1998,
10 minutes between January 16, 1998 and January 30, 1998,
15 minutes thereafter.
This has resulted in approximately 20 values being recorded for final storage in every output interval.
(NOTE: Between Jan 16, 1997 @ 09:30 and Jan 12, 1998 @ 21:15 the
station was taken down and brought to the U.S. It was taken back to Antarctica
for the 1997-98 season andamp; set up on January 12, 1998).
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Sampling Coverage:
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| Geographic Coverage: |
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Geographic Description: | The Canada Glacier meteorology station is located
at a latitude of 77 48.42128 S, a longitude of 162 57.80702 E, and an
elevation of 264.42892 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: | 162.96345 degrees
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| East: | 162.96344 degrees
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| North: | -77.80701 degrees
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| South: | -77.80702 degrees
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Mimimum Altitude: | 265 meter |
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Maximum Altitude: | 264 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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