| 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: | 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: | Soil_Temperature_Units
View Table Metadata
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| Data Table: | SnowHeight_SurfChange_Units
View Table Metadata
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| Data Table: | Precipitation_Units
View Table Metadata
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| Data Table: | Water_Vapor_Density_Units
View Table Metadata
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Short Name: | bonney_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 Lake Bonney Station - BOYM
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RH (relative humidity)
AIRT (air temperature)
PPT (precipitation)
WIND (wind speed, direction, etc)
SOILT (soil temperature
RADN (radiation)
SNOWHT (snow height)
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 bonney - BOYM |
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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 Lake Bonney meteorology station (in Taylor Valley).
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| Keywords: |
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- meteorology
(theme)
- temperature
(theme)
- air temperature
(theme)
- soil temperature
(theme)
- precipitation
(theme)
- wind
(theme)
- relative humidity
(theme)
- radiation
(theme)
- surface height
(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 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 Bonney meteorology station is located at a
latitude of -77.714443, a longitude of 162.46415, and an elevation
of 64.43 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: | 162.46416 degrees
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| East: | 162.46415 degrees
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| North: | -77.714443 degrees
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| South: | -77.714443 degrees
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Mimimum Altitude: | 65 meter |
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Maximum Altitude: | 64 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 August 24, 1999, the data manager did some fine-tuning of the data, as requested by Thomas
Nylen. This included:
1. Placement of flags for WDir and WDirStD between Jan 6, 1998 @ 17:15 and Jan 15,
1998 @ 9:00. It was assumed the data was deleted because the wind direction values = 0.
This needed to be indicated in the notes portion of the file.
2. Deletion of SoilT5cm, SoilT10cm, SwRadIn, SwRadOut, PAR, LwRadIn and
LwRadOut2 values on 1/15/98 @ 9:15. They all appeared suspect are regarded as bad
data.
3. Deletion of precipitation values between 1/15/98 @ 10:15 and 1/15/98 @ 10:45. The
values were zero and are regarded as bad data.
4. Removal and flagging of the WDirStd data from Nov 12, 1994 @ 17:20 to Jan 20, 1995
@ 10:20.
5. Addition of precipitation values between Dec 5, 1994 @ 11:20 Jan 20, 1995 @ 10:20. At
the request of Thomas Nylen, the first value for precipitation in this group was
subjectively voided, and the 3 values right after this file were deleted (01/20/1995
10:20:00 AM to 11:00 AM).
6. Addition of WSpd, WSpdMax and WSpdMin values between Dec 5, 1994 @ 11:20 Jan
20, 1995 @ 10:20. In addition, WDir and WDirStd on 12/26/1994 4:00:00 was voided
because the wind speed = 0.
7. Addition of records taken between Nov 9, 1995 @ 19:20 and Nov 22, 1995 @ 16:20.
These records were not among the file provided on the web to that point.
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 16, 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.
In May 2003, PAR values between 11/20/01 10:30 AM and 1/24/02 11:45 AM were changed
because the wrong multiplier was used the first time it was processed. The values were divided
by 1.37283 (old multiplier) and multiplied by 1.64249 (correct multiplier).
In Apr 2004, LwRadIn data between 11/17/2000 @ 1130 am and 01/09/2002 @ 08:45 am were
delete and flagged as "LwRadIn value recorded by instrument but known to be bad data". The
sensor values were considerably lower than the tempeature corrected LwRadIn2 value. The
battery in the Eppley Pyrgeometer was probably left in, which affects the output voltage.
On June 4, 2004, the relative humidity (RH) values after January 15, 2000 @ 1300 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.
In March 2006, Chris Gardner consolidated the SnowHt and SoilSurfChange tables, as they are actually
the same measurement. The Data in BOYM_SNOWHT from 1/24/2003 4:00PM through 1/24/2004 1:30PM were
taken from BOYM_SOILSURFCHANGE
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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 BOYM dataset for the date range 1/24/2004 13:30 - 01/29/2007 11:00 (105,587 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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The Lake Bonney meteorology station was initially built on
the lake's ice cover in November, 1993. Shortly thereafter the station was
listed to the point where it was decided to move it to shore. Some attempt was
made to right the station during this period. The move of the station was done
using the ATV with the station still running. The move began at 14:50 and ended
at 15:06 on December 17, 1993. Data collected after 15:06 was done so with the
station in it's final position. The clock synchronized with John Priscu's logger
measuring light on Nov 26 in afternoon. 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:
10 minutes from November 24, 1993 to January 12, 1994,
three hours from January 12, 1994 to November 12, 1994,
20 minutes from November 12, 1994 to November 22, 1995
15 minutes thereafter.
This has resulted in approximately 28 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 Bonney meteorology station is located at a
latitude of 77 50.981 S, a longitude of 162 27.84968 E, and an elevation
of 64.43 meters above sea level.
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Bounding Coordinates:
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| West: | 162.46416 degrees
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| East: | 162.46415 degrees
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| North: | -77.714443 degrees
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| South: | -77.714443 degrees
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Mimimum Altitude: | 65 meter |
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Maximum Altitude: | 64 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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