uid=MCM,o=EDI,dc=edirepository,dc=org all public read 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)