nitrite

Nitrogen and phosphorus concentrations in glacial meltwater streams, McMurdo Dry Valleys, Antarctica (1993-2020, ongoing)

Abstract: 

As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, a systematic sampling program has been undertaken to monitor the glacial meltwater streams in that region. This table contains macronutrient concentrations (nitrate, nitrite, ammonium, soluble reactive phosphorus) found at specific locations in McMurdo Dry Valley streams.

LTER Core Areas: 

Dataset ID: 

21

Associated Personnel: 

1144
1145

Related publications: 

Sources and sinks of nutrients in a polar desert stream, the Onyx River, Antarctica

Related links: 

McMurdo Dry Valleys Gage Map

Short name: 

STREAM_NUTRIENTS

Locations: 

Aiken Creek at F5
Andersen Creek at H1
Andrews Creek at mouth
Bartlette Creek at mouth
Bohner stream at lower site
Bohner Stream at mouth
Bowles Creek at mouth
Canada Stream at F1
Commonwealth Stream at C1
Crescent Stream at F8
Delta Stream at F10
Green Creek at F9
Harnish Creek at F7
Harnish Creek Tributary at F11
House Stream at H2
Huey Creek at F2
Lawson Creek at B3
Lizotte Creek at mouth
Lost Seal Stream at F3
Lyons Creek at B4
Mariah Creek at mouth
Mason Creek at Mouth
McKay Creek at mouth
McKnight Creek at mouth
Onyx River at Lower Wright Weir
Onyx River at Lake Vanda Weir
Priscu Stream at B1
Red River at Blood Falls
Santa Fe Stream at B2
Sharp Creek at mouth
Von Guerard stream at upper site
Von Guerard Stream at F6
Von Guerard Stream at F21
Von Guerard Stream at mouth
Vincent Creek at mouth
Wharton Creek at mouth

Data sources: 

STREAM_NUTRIENTS

Methods: 

All samples are analyzed in the Crary Lab in McMurdo using a Lachat Autoanalyzer, unless noted otherwise

Maintenance: 

In 2016, data gathered at non-core locations (places monitored for the long term) was added to this dataset, going back to the 2007/2008 season.  

In 2015, the metadata was migrated to DEIMS to enhance the McMurdo LTER services. In 2008, Kathy Welch and the Information Manager (Chris Gardner went through the stream nutrients table and QA/QCd every season. All molar units were converted back to mass units (ug/L) and an Oracle View was created to make the conversion to molar units automatic in order to avoid human conversion errors. Many previously-reported values were also found to be below the known detection limit analyzed on the Lachat. These were flagged as ND, and put into the comments column. All pre-LTER data were removed from the table because there were many duplicate stream gauge ID/ dates with no times. There were also many non-core locations in the table. Constraints were added to the new database to ensure non-core data are not added in the future, and no duplicate stream gauge ID/DATE_TIMEs can be added. The original iterations of the 'strmnutr' file (stream nutrient data) were created by Kathy Welch, and submitted to Denise Steigerwald (the data manager) at the Institute of Arctic and Alpine Research (INSTAAR). These files are currently located on the PC in the data manager's office at INSTAAR. Following discussions between Kathy Welch and Denise Steigerwald, it was decided to add some fields (eg. strmgageid, collection date, comments for each type of measurement) to these files in order to make them more consistent and relational for future references. Following these revisions, they were imported into Microsoft Access and saved in a table named "Stream Nutrients". This table was exported as an ascii, text, comma delimited file (strmnutr.dat) and as an MS-DOS text, table layout file (strmnutr.txt), to present on the MCM LTER web site. Both of these files are linked to this web page above.

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