uid=MCM,o=EDI,dc=edirepository,dc=org
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BRHM
High frequency measurements from Lake Brownworth Meteorological Station (BRHM), McMurdo Dry Valleys, Antarctica (1994-2022, 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
2023-07-07
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 data package contains 15-minute data from the Lake Brownworth Meteorological Station (BRHM), located in Wright Valley (Latitude: -77.43344, Longitude: 162.7036, Elevation: 279 meters above sea level). BRHM was established in 1994, during the 94/95 field season.
air temperature
climate
climatology
meteorology
relative humidity
solar radiation
wind
wind direction
wind speed
LTER Controlled Vocabulary
air temperature
humidity
meteorology
radiation
relative humidity
RH
snow
snow depth
soil
surface height
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-lake-brownworth-meteorological-station-brhm-mcmurdo-dry-valleys
Located west of Lake Brownworth.ID: BHRM
162.703600000000
162.703600000000
-77.434400000000
-77.434400000000
279
279
meter
1994-12-30
2022-12-13
Meteorological data are collected year-round at each of MCM LTER stations. Data are 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
The first 96 records found in the 978/brh/brh97f01 file contained the same dates/times as the latter portion of the 967/brh/brh96702 file (overlap of records in the 1996/97 and 1997/98 files). Although the values in these files did not contain exact matches, a choice had to be made on which records to use. The data manager subjectively decided to use the 1996/97 records. This explains why the first record number (fline#) from the 978/brh/brh97f01 file is '978/brh/brh97f01.96', rather than 978/brh/brh97f01.0. If you have any questions, please contact the data manager. On August 17, 1999, the data manager added the 1998-1999 data to this dataset. In the process, she did some fine-tuning of the data, which included: removal of the relative humidity data from November 1995 through April 1996, as requested by Peter Doran. The values during this period were unquestionably low, so it was recommended that the values be marked as bad and not included in the data files. making the file layout consistent from year to year. This results in many null values being present for periods when certain values were not collected. However, it simplifies combining data from different years. making corrections so that the files containing data for a given year started on January 1 at 0:00 and ended on December 31 at 23:45. Up to this point, records for January 1 between 0:00 and 12:45 were appearing in the previous year's file. Fine-tuning of the comments fields so they were more concise and/or explanatory. For example, radiation comments were updated from "SwRadIn flagged with an 'S'" to "Negative value for SwRadIn zeroed out". The 'WDir Comments' field was renamed to 'Wind Comments'. With the exception of removal of the relative humidity values described above, data values were not changed. On August 27, more fine-tuning of the data occurred. This included: addition of NetRad from Nov 24, 1995 @ 16:45 to Jan 23, 1996 @ 11:00. addition of SwRadOut and PAR from Nov 13, 1996 @ 15:15 to Jan 25, 1997 @ 10:15. On July 3, 2001, Thomas Nylen adjusted the data. This included: Added 37 degrees (clockwise) to WDir results between 11/20/1995 16:00 and 11/27/1998 11:15 Subjectively voided WDir and WDirStD between 3/1/1996 00:15: and 04/19/96 23:30 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, SwRadIn values between 12/30/1994 10:00:00 PM and 4/19/1996 11:30:00 PM were changed because it was determined the wrong multiplier was used. The values were corrected by dividing by 88.4 (mAmps m-2) and multiplying by 113.12 (W m-2). On June 4, 2004, the relative humidity (RH) values after January 26, 2000 @ 1545 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 * [AirT3 m])))))) / (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. The ultrasonic ranger sensor that measures surface height change has been broken since November 2010, with no plans to replace as of July 2023.
McMurdo Dry Valleys LTER
Information Manager
im@mcmlter.org
McMurdo Dry Valleys LTER
http://mcmlter.org/
McMurdo Dry Valleys LTER
During the 1994-1995 field season, the McMurdo LTER, in collaboration with NZARP (New Zealand Antarctic Research Programme), established a meteorology station at Lake Brownworth in Lower Wright Valley at the head of the Onyx River. 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 hour between December 30, 1994 and November 24, 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
BRHM_AIRT
BRHM - Air Temperature
mcmlter-clim-brhm_airt-15min-20230630.csv
33718948
1
1
\n
column
,
"
https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-brhm_airt-15min-20230630.csv
DATASET CODE
DATASET CODE
Code for given set of information for Lake Brownworth meteorology station
string
Code for given set of information for Lake Brownworth meteorology station
METLOCID
METLOCID
Location code for Lake Brownworth meteorology station
string
Location code for Lake Brownworth meteorology station
DATE_TIME
DATE_TIME
Date/time of sample (New Zealand DST, +13 UTC)
date
MM/DD/YYYY HH24:MI
AIRT3M
AIRT3M
Average air temperature at 3 m above ground
celsius
0.01
real
Null
See Comment Column
AIRTMAX
AIRTMAX
Maximum air temperature at 2.5 - 3 m above ground
celsius
0.01
real
Null
None given
AIRTMIN
AIRTMIN
Minimum air temperature at 2.5 - 3 m above ground
celsius
0.01
real
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
BRHM_RADN
BRHM - Solar Radiation
mcmlter-clim-brhm_radn-15min-20230630.csv
53294971
1
1
\n
column
,
"
https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-brhm_radn-15min-20230630.csv
DATASET CODE
DATASET CODE
Code for given set of information for Lake Brownworth meteorology station
string
Code for given set of information for Lake Brownworth meteorology station
METLOCID
METLOCID
Location code for Lake Brownworth meteorology station
string
Location code for Lake Brownworth meteorology station
DATE_TIME
DATE_TIME
Date/time of sample (New Zealand DST, +13 UTC)
date
MM/DD/YYYY HH24:MI
PAR
PAR
Photosynthetically active radiation
micromols/second/meter2
0.1
real
Null
see comments column note
SWRADIN
SWRADIN
Incoming shortwave radiation/solar flux
W/m2
0.1
real
Null
see comment column note
SWRADOUT
SWRADOUT
Outgoing shortwave radiation/solar flux
W/m2
0.1
real
Null
see comment column value
UVA
UVA
Incoming ultraviolet-A radiation
W/m2
0.1
real
Null
see comment column value
UVB
UVB
Incoming ultraviolet-B radiation
W/m2
0.1
real
Null
see comment column note
NETRAD
NETRAD
Net radiation
W/m2
0.1
real
Null
see comment column note
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
BRHM_RH
BRHM - Relative Humidity
mcmlter-clim-brhm_rh-15min-20230630.csv
31301551
1
1
\n
column
,
"
https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-brhm_rh-15min-20230630.csv
DATASET CODE
DATASET CODE
Code for given set of information for Lake Brownworth meteorology station
string
Code for given set of information for Lake Brownworth meteorology station
METLOCID
METLOCID
Location code for Lake Brownworth meteorology station
string
Location code for Lake Brownworth meteorology station
DATE_TIME
DATE_TIME
Date/time of sample (New Zealand DST, +13 UTC)
date
MM/DD/YYYY HH24:MI
RH
RH
Relative humidity at 3 meters
percent
0.1
real
Null
see comment note
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
BRHM_SOILT
BRHM - Soil Temperature
mcmlter-clim-brhm_soilt-15min-20230630.csv
43546904
1
1
\n
column
,
"
https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-brhm_soilt-15min-20230630.csv
DATASET CODE
DATASET CODE
Code for given set of information for Lake Brownworth meteorology station
string
Code for given set of information for Lake Brownworth meteorology station
METLOCID
METLOCID
Location code for Lake Brownworth meteorology station
string
Location code for Lake Brownworth meteorology station
DATE_TIME
DATE_TIME
Date/time of sample (New Zealand DST, +13 UTC)
date
MM/DD/YYYY HH24:MI
SOILT0CM
SOILT0CM
Soil temperature at 0 cm depth
celsius
0.01
real
Null
See Comment Col. note
SOILT5CM
SOILT5CM
Soil temperature at 5 cm depth
celsius
0.01
real
Null
See Comment Col. note
SOILT10CM
SOILT10CM
Soil temperature at 10 cm depth
celsius
0.01
real
Null
See Comment Col. note
SOILT_COMMENTS
SOILT_COMMENTS
Noted comments by the investigator about the particular measure of SOILT_
string
Noted comments by the investigator about the particular measure of SOILT_
BRHM_SURFCHANGE
BRHM - Surface Change
mcmlter-clim-brhm_surfchange-15min-20230630.csv
27650704
1
1
\n
column
,
"
https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-brhm_surfchange-15min-20230630.csv
DATASET CODE
DATASET CODE
Code for given set of information for Lake Brownworth meteorology station
string
Code for given set of information for Lake Brownworth meteorology station
METLOCID
METLOCID
Location code for Lake Brownworth meteorology station
string
Location code for Lake Brownworth meteorology station
DATE_TIME
DATE_TIME
Date/time of sample (New Zealand DST, +13 UTC)
date
MM/DD/YYYY HH24:MI
SURFCHANGE_CM
SURFCHANGE_CM
Surface Height Change - snowfall / sediment accumulation or loss
centimeter
0.4
real
Null
None given
SURFCHANGE_COMMENTS
surface change comments
Noted comments by the investigator about the particular measure of surface change
string
Noted comments by the investigator about the particular measure of surface change
BRHM_WIND
BRHM - Wind Direction & Speed
mcmlter-clim-brhm_wind-15min-20230630.csv
46022621
1
1
\n
column
,
"
https://mcm.lternet.edu/sites/default/files/data/mcmlter-clim-brhm_wind-15min-20230630.csv
DATASET CODE
DATASET CODE
Code for given set of information for Lake Brownworth meteorology station
string
Code for given set of information for Lake Brownworth meteorology station
METLOCID
METLOCID
Location code for Lake Brownworth meteorology station
string
Location code for Lake Brownworth 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
Null
None given
WDIRSTD
WDIRSTD
Standard deviation of wind direction
degreesfromnorth
0.1
real
Null
None given
WSPD
WSPD
Wind speed
metersPerSecond
0.1
real
Null
None given
WSPDMAX
WSPDMAX
Maximum wind speed
metersPerSecond
0.1
real
Null
None given
WSPDMIN
WSPDMIN
Minimum wind speed
metersPerSecond
0.1
real
Null
None given
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_
BRHM_WVAPD
BRHM - Water Vapor Density
BRHM_WVAPD.csv
203573
27
1
\n
column
,
"
https://mcm.lternet.edu/sites/default/files/BRHM_WVAPD.csv
DATASET CODE
DATASET CODE
Code for given set of information for Brownsworth meteorology station
string
Code for given set of information for Brownsworth meteorology station
METLOCID
METLOCID
Location code for Brownsworth meteorology station
string
Location code for Brownsworth 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)