Streamwater Ca, Sr and 87Sr/86Sr measurements on Watershed 1 at the Hubbard Brook Experimental Forest
Streamwater Ca, Sr and 87Sr/86Sr measurements on Watershed 1 at the Hubbard Brook Experimental Forest
Joel Blum
University of Michigan
1100 N Univ Ave
Ann Arbor, MI 48109

Phone: (734) 615-3242
This dataset includes ICP-OES analyses of Ca and Sr concentration and thermal ionization mass spectrometry analyses of 87Sr/86Sr ratios for weekly samples of Watershed 1 unfiltered streamwater collected just above the weir.
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
calcium, ecosystems, forests, HBEF Watershed 1, HBR, Hubbard Brook LTER, isotopes, streamwater, strontium, watersheds.
KEYWORD SET: LTER Core Research Areas
disturbance, inorganic nutrients.
Watershed 1 is an 11.8 ha watershed extending from the weir at 488 m to the ridge at 747 m.
West bounding coordinate: -71.731339
East bounding coordinate: -71.726311
North bounding coordinate: 43.959286
South bounding coordinate: 43.952053
Minimum: 488
Maximum: 747
(Unit: meter)
Weir 1 Location
West bounding coordinate: -71.726501
East bounding coordinate: -71.726501
North bounding coordinate: 43.952034
South bounding coordinate: 43.952034
Stream waters were collected weekly in acid-washed LDPE bottles approximately 10 m upstream of the gauging weir on Watershed 1. During several late summer periods of the study stream discharge ceased and weekly samples could not be collected.
Cation (Ca, Sr) concentrations were measured using an Inductively Coupled Plasma Emission Spectrometer (ICP-OES; PE-3300DV, Perkin Elmer, Norwalk, CT) with a five- to eight-point calibration curve. Replicate analysis of NIST-traceable quality control standards indicate that analytical accuracy was within 5%. To prepare water samples for Sr isotope analysis, an aliquot containing ~100 ng of Sr was evaporated to dryness and redissolved in concentrated ultrapure HNO3. This solution was evaporated, redissolved in 3 M ultrapure HNO3, and loaded onto a quartz column containing Eichrom Sr-Spec resin. The aliquot was evaporated and dissolved in 0.3 M H3PO4 and then loaded onto W filaments using Ta2O5 powder. Between 100 and 200 isotope ratio measurements were made per sample using a thermal ionization mass spectrometer (Finnigan MAT 262, Bremen, Germany). To correct for instrumental mass fractionation, the 87Sr/86Sr ratios were normalized to an 86Sr/88Sr ratio of 0.1194. Multiple measurements of NBS987 yielded an 87Sr/86Sr ratio of 0.710252 0.000013 (2σ, n = 161).
  • Nezath, C.A., Blum, J.D., and Driscoll, C.T. 2016. Patterns of Ca/Sr and 87Sr/86Sr variation before and after a whole watershed CaSiO3 addition at the Hubbard Brook Experimental Forest, USA. Geochim Cosmochim Acta 74:3129-3142.
  • Peters, S.C., Blum, J.D., Driscoll, C.T., and Likens, G.E. 2004. Dissolution of wollastonite during the experimental manipulation of a forested catchment. Biogeochemistry 67:309-329.
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]. (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.


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

Phone: (603) 726-8902

Data file: w1_stream_isotopes.txt
Description: Ca, Sr and Sr isotope measurements of streamwater on Watershed 1 at the Hubbard Brook LTER.
Notes on Data: Original data are located at the Blum Lab, Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor.
ColumnVariableDescriptionUnitsCoded?Missing value label
1DateSample collection dateYYYY-MM-DDnnone
2Calcium_DateA counter of days prior to and following the 1999 calcium additiondaynnone
3MonthMonth of sample collectionMMnnone
4CaCalcium concentration in streamwatermilligramPerGramn
5SrStrontium concentration in streamwaternanogramPerGramn
687_86RatioStrontium 87:86 isotope ratio in streamwaterdimensionlessn
7Pct2SEStatistical variability of 87_86Ratio data. Two standard errors, in percent.dimensionlessn
8Ca_SrRatioCalcium:Strontium molar ratio in streamwatermolen

Missing Value Code
Code Explanation
Analysis not performed
Analysis not performed
Analysis not performed
Analysis not performed
Analysis not performed