Longitudinal Stream Chemistry at the Hubbard Brook Experimental Forest, Watershed 1, 1991 - present.
TITLE
Longitudinal Stream Chemistry at the Hubbard Brook Experimental Forest, Watershed 1, 1991 - present.
PRINCIPAL INVESTIGATOR(s)
Charles Driscoll
Dept. of Civil and Environmental Engineering
220 Hinds Hall
Syracuse, NY 13244
USA

Phone: (315) 443-2311
ABSTRACT:
Longitudinal variation in streamwater chemistry has been measured in two watersheds (W1 and W6) at the Hubbard Brook Experimental Forest. This dataset includes samples that have been collected approximately monthly in Watershed 1 at five sampling locations (1991 – present) along an elevational gradient. Samples are analyzed for pH, ANC, anions, cations, nitrogen, dissolved inorganic and organic carbon.
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
acid neutralizing capacity, aluminum, ammonium, calcium, carbon, chemistry, chloride, dissolved inorganic carbon, dissolved organic carbon, elevation, fluoride, forests, HBEF Watershed 1, HBR, Hubbard Brook LTER, magnesium, nitrate, nitrogen, pH, potassium, silica, sodium, stream, sulfate, water, watersheds.
KEYWORD SET: LTER Core Research Areas
inorganic nutrients, organic matter.
BEGIN DATE
1991
END DATE
2014
LOCATION
HBEF watershed 1 (WS1)
West bounding coordinate: -71.731339
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
Watershed 1, Site 1
West bounding coordinate: -71.731339
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
Elevation
Minimum: 695
Maximum: 695
(Unit: meter)
Watershed 1, Site 2
West bounding coordinate: -71.731339
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
Elevation
Minimum: 629
Maximum: 629
(Unit: meter)
Watershed 1, Site 2.5
West bounding coordinate: -71.731339
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
Elevation
Minimum: 584
Maximum: 584
(Unit: meter)
Watershed 1, Site 3
West bounding coordinate: -71.731339
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
Elevation
Minimum: 531
Maximum: 531
(Unit: meter)
Watershed 1, Site 4
West bounding coordinate: -71.731339
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
Elevation
Minimum: 488
Maximum: 488
(Unit: meter)
SAMPLING DESIGN
Samples are collected along an elevation gradient in Watershed 1. Sampling began in 1991. Streamwater is collected approximately monthly at five sampling locations. Samples are collected in plastic bottles and returned to the laboratory for analysis of pH, ANC, cations, anions, dissolved carbon and nitrogen
LABORATORY PROCEDURES
The pH of samples is measured potentiometrically with a glass electrode. The acid neutralizing capacity is measured using Gran titration with an auto-titrator. The major anions (SO42-, NO3-, Cl-, F-) are measured using ion chromatography. Prior to 2002, F- was measured with an ion-selective electrode. Base cations (Ca2+, Mg2+, Na+, K+), total Al, and H4SiO4 (as total dissolved Si) are measured using inductively coupled mass spectrometry (ICP-MS). Prior to 2004 the cations and total Al were measured using atomic absorption spectrometry (AA). Prior to 2006, the H4SiO4 concentration was measured colorimetrically. The ammonium and monomeric aluminum concentrations are measured colorimetrically. Total nitrogen (TN) is measured using combustion oxidation with chemiluminescence detection. Prior to 2006 TN was measured using a colorimetric method. Dissolved inorganic carbon (DIC) is analyzed using infrared detection. Dissolved organic carbon (DOC) is analyzed using infrared detection following persulfate oxidation.
REFERENCES
  • Driscoll, C.T., Fuller, R.D., and Simone, D.M. 1988. Longitudinal variations in trace metal concentrations in a northern hardwood forested ecosystem. J. Environ. Qual. 17(1):101-107.
  • Johnson, C.E., Driscoll, C.T., Siccama, T.G., and Likens, G.E. 2000. Element fluxes and landscape position in a northern hardwood forest watershed ecosystem. Ecosystems 3:159-184.
DATA ACCESS GUIDELINES
Data Use Policy



The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, government or other not-for-profit professional purposes.

2) Redistribution. The data and metadata are provided for use by the Data User. The Data User will not redistribute the original Data Set or metadata to others without the explicit permission of the Principal Investigator.

3) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly attribute the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier.

Citation example: Holmes, R.T. 2012. Bird Abundances at Hubbard Brook (1969-2010) and on three replicate plots (1986-2000) in the White Mountain National Forest. Durham, NH. Hubbard Brook Data Archive [Database]. http://hubbardbrook.org/data/dataset.php?id=81 (23 July 2012)

4) Acknowledgment: The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed to its content. Acknowledgments should identify the supporting party, the party that received the support, and any identifying information such as grant numbers.

Acknowledgment example: Data on [topic] were provided by [name of PI] on [date]. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station, Newtown Square, PA. Significant funding for collection of these data was provided by [agency]-[grant number], [agency]-[grant number], etc.

5) Consultation and questions. Data users are strongly encouraged to consult with the Principal Investigator(s) who collected these data for further information. Also, when appropriate, Data Users should consider including the Principal Investigator as a collaborator and/or co-author in the use of these data.

6) Notification. The Data User will notify the Principal Investigator of any publication or derivative work based on the Data Set. The Data User will also provide the Principal Investigator and/or the administrator of the Hubbard Brook Ecosystem Study with a pdf or two reprints of any publication(s) resulting from use of the Data Set.

7) Disclaimer. While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

8) Terms of Agreement. By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.



CONTACT PERSON

Information Manager, Hubbard Brook LTER
234 Mirror Lake Road
North Woodstock, NH 03262
USA

Phone: (603) 726-8902
Email: hbr-im@lternet.edu

Data file: w1long_strmchem.txt
Description: Longitudinal stream chemistry measurements at Watershed 1, Hubbard Brook LTER
Notes on Data: Current detection limits for the Driscoll laboratory: Na (0.015 umol/L), K (0.12 umol/L), Ca (0.030 umol/L), Mg (0.0032 umol/L), Alt (0.0026 umol/L), Alm (1.3 umol/L), Alo (1.3 umol/L), NH4 (0.55 umol/L), H4SiO2 (3 umol/L), Cl (0.55 umol/L), NO3 (0.85 umol/L), SO4 (0.53 umol/L), F (0.097 umol/L), DIC (20 umol/L), DOC (20 umol/L), TN (0.81 umol/L). It is suggested to dataset users to use a value of one half the detection limit when a value for a solute is less than the detection limit. The data are physically located at the Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY and was last updated in May 2013.
ColumnVariableDescriptionUnitsCoded?Missing value label
1DateSample dateYYYY-MM-DDnnone
2WSWatershed identification numbernoneynone
3SiteSitenoneynone
4ElevElevation of stream sampling locationmeternnone
5pHpH measurementdimensionlessn
-999.99
-888.88
6ANCAcid Neutralizing CapacitymicroEquivalentPerLitern
-999.99
-888.88
7SiDissolved silica concentration in umol/LmicroMolePerLitern
-999.99
-888.88
8Na+Sodium concentration in umol/LmicroMolePerLitern
-999.99
-888.88
9K+Potassium concentration in umol/LmicroMolePerLitern
-999.99
-888.88
10Ca2+Calcium concentration in umol/LmicroMolePerLitern
-999.99
-888.88
11CaFLAGNotes on calcium measurementsnoneynone
12Mg2+Magnesium concentration in umol/LmicroMolePerLitern
-999.99
-888.88
13AltTotal aluminum concentration in umol/LmicroMolePerLitern
-999.99
-888.88
14AlmTotal monomeric aluminum concentration in umol/LmicroMolePerLitern
-999.99
-888.88
15AloOrganic monomeric aluminum in umol/LmicroMolePerLitern
-999.99
-888.88
16NH4+Ammonium concentration in umol/LmicroMolePerLitern
-999.99
-888.88
-777.77
17F-Total fluoride concentration in umol/LmicroMolePerLitern
-999.99
-888.88
18Cl-Chloride concentration in umol/LmicroMolePerLitern
-999.99
-888.88
19SO4=Sulfate concentration in umol/LmicroMolePerLitern
-999.99
-888.88
20NO3-Nitrate concentration in umol/LmicroMolePerLitern
-999.99
-888.88
21DICDissolved inorganic carbon in umol/LmicroMolePerLitern
-999.99
-888.88
22DOCDissolved organic carbon in umol/LmicroMolePerLitern
-999.99
-888.88
23TNTotal nitrogen in umol/LmicroMolePerLitern
-999.99
-888.88

CODES

Variable: WS
Code
Description
1
Watershed 1
Variable: Site
Code
Description
1.0
Site 1
2.0
Site 2
2.5
Site 2.5
3.0
Site 3
4.0
Site 4
Variable: CaFLAG
Code
Description
Y
Flagged. Data currently being reanalyzed. For informational purposes only.
N
No flag. Data analysis complete

MISSING VALUE CODES
Variable
Missing Value Code
Code Explanation
pH
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
ANC
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
Si
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
Na+
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
K+
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
Ca2+
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
Mg2+
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
Alt
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
Alm
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
Alo
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
NH4+
-999.99
-888.88
-777.77
Data missing or not taken at this time
Sample volume too small for analysis
Analyte concentration below limit of detection
F-
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
Cl-
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
SO4=
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
NO3-
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
DIC
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
DOC
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis
TN
-999.99
-888.88
Data missing or not taken at this time
Sample volume too small for analysis