Chemistry of Streamwater at the Hubbard Brook Experimental Forest, Valleywide Measurements, 2001
TITLE
Chemistry of Streamwater at the Hubbard Brook Experimental Forest, Valleywide Measurements, 2001
PRINCIPAL INVESTIGATOR(s)
Gene E. Likens
Cary Institute of Ecosystem Studies
2801 Sharon Turnpike
Millbrook, NY 12545
USA

Phone: (845) 677-5343
Don Buso
Cary Institute of Ecosystem Studies
234 Mirror Lake Road
North Woodstock, NH 03262
USA
ABSTRACT:
Streamwater chemistry has been measured at the Hubbard Brook Experimental Forest since 1963. This study expands upon relationships observed from long-term studies of stream water chemistry within the nine gaged watersheds at Hubbard Brook Experimental Forest, in order to determine whether those relationships hold true for the wider Hubbard Brook Valley. This dataset includes data from samples collected across the valley from tributary streams of Hubbard Brook. Measurements included ANC, pH, DOC, DIC, cations, anions, specific conductance and temperature. .
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
aluminum, ammonium, acid neutralizing capacity, calcium, chemistry, chloride, dissolved inorganic carbon, dissolved organic carbon, HBEF Valleywide Study, Hubbard Brook Experimental Forest, HBR, Hubbard Brook LTER, magnesium, nitrate, pH, phosphate, potassium, silica, sodium, specific conductance, stream, sulfate, temperature, watershed.
KEYWORD SET: LTER Core Research Areas
inorganic nutrients.
BEGIN DATE
2001
END DATE
2001
LOCATION
The valley-wide stream samples are a series of collections spanning the entire Hubbard Brook Valley.
West bounding coordinate: -71.80620
East bounding coordinate: -71.70220
North bounding coordinate: 43.9590
South bounding coordinate: 43.9140
SAMPLING DESIGN
Each stream was sampled at 100m intervals, from the confluence with the main Hubbard Brook, to the first running water, typically at the top of each watershed. Major side channels for 2nd and 3rd-order streams were also sampled at 100m intervals to first running water. Each of the major tributary watersheds was sampled in one day. Some watersheds were relatively simple, so that several similar streams could be sampled in one day. Other watersheds had a variety of branching patterns and rugged terrain that took an entire day to cover. Coverage is more complete (750 samples in the fall vs 650 in the spring) in the fall survey for 2 reasons: 1) streams gradually dried up in the late spring, early summer survey as leaf-out progressed; 2) streams tended to wet-up in the fall after deciduous leaf abscission. Thus, the distance to first running water was often extended in the second survey. All the major perennial streams in the HBEF Valley were included. There were a number of stream channels that were not sampled because they were dry. These evidently were ephemeral tributaries that contained water only briefly during snowmelt runoff and following heavy rain events.
SAMPLE SITE LOCATION
Samples were taken at 100m intervals determined by walking up the channels with a hip-chain in the first survey. On reaches with a sinusoidal pattern, the straight-line distance between samples sites could be much shorter than 100m. Labeled, polypropylene flags were inserted in the stream bank at each site along with a tape streamer for quick identification during the second round. Locations were determined using a hand-held GPS receiver (Garmen Vista). Elevations were taken from a USGS DEM provided in Terrain Navigator mapping software. Sample sites could be roughly located by the branching pattern of the systematic watershed and site numbering system (see data Format next), but this could be highly inaccurate because no system was found that could number forked channels as to direction left/right, or east/west, etc.
SCOPE OF WORK
Samples were collected in the spring after snowmelt and again in the fall before winter snowfall. The initial plan was to reduce the two collection periods to a minimum of a few weeks each to provide near-instantaneous ‘snap-shots’ of biogeochemical conditions throughout the Valley. However, this proved to be impossible, given the logistics involved in sampling nearly simultaneously all the major tributaries to Hubbard Brook. As a result, each time period extended to almost 2 months. There were no heavy rains and resultant high stream flows on days when samples were collected. Thus, we have some confidence that hydrologic conditions were not radically different between streams during each survey. Furthermore, our long-term data from the gauged watersheds indicates that the relationship between stream flow and solute concentration is relatively weak for most solutes, even across 5 orders of magnitude increases in flow. Spring snowmelt in 2001 proceeded remarkably gradually and without any rain-augmented high flows. There were no heavy rain events in the fall of 2001, prior to our collection, and a permanent snow pack did not develop until after we had finished.
ANALYTICAL PROTOCOL
The chemical measurements were made at HBEF in the RS Pierce Ecosystems Laboratory (N. Woodstock, NH), or at the Cary Institute of Ecosystems Studies Analytical Laboratory (Millbrook, NY), or at the US Forest Service Laboratory (Durham, NH). Analytical protocols and estimates of accuracy and precision are described in detail by Buso et al. (2000). Quality control procedures used as a standard for the long-term Hubbard Brook chemical data were applied to these data as well.
DATA PROTOCOL
The main Hubbard Brook (HB) watershed was labeled #88. The tributary watersheds (WS-) were numbered by the approximate distance in meters, divided by 10, upstream from the Rte 3 bridge over HB (starting point of the survey). For example, WS-70 (Mirror Lake outlet stream) enters HB at about 700m above Rte 3; WS-1305 (Lost Brook) enters HB about 13 km upstream of Rte 3. Larger branches on 4th order streams were given separate watershed labels: e.g. WS-868 (Canyon Brook) branched into 868 (east fork) and 869 (west fork). The decision to choose the main stem at a fork was based on an estimate of observed flow and not the base map.
Sample sites were numbered starting at site 0 (a few meters above the entry point of the tributary to the main Hubbard Brook) and increased upstream at 100m intervals: e.g. WS-392, Site 0, 1, 2, 3, etc. Branches on tributaries were numbered according to the distance along the 100m interval: e.g., WS-392 branches at 1530m above HB, giving rise to site number 15.30. Additional sample sites on these branches were numbered by 100m intervals from the point of branching: e.g., in WS-392, we collected three more samples up branch 15.30, at sites numbered 15.31, 15.32, and 15.33. While obviously flawed from the standpoint of perfect fractal nomenclature, this was an on-the-fly decision that allowed for quick identification of bottles and corresponding field notes. The main Hubbard Brook (preset as WS-88) was sampled just upstream of each tributary and these sites were labeled with the tributary watershed number: e.g. WS-88, Site-1074 was the main HB sample taken just above the main stem of Kineo Brook (WS-1074).
REFERENCES
  • Buso, D.C., Likens, G.E., and Eaton, J.S. 2000. Chemistry of precipitation, streamwater, and lakewater from the Hubbard Brook Ecosystem Study: a record of sampling protocols and analytical procedures. USDA Forest Service, Northeastern Research Station Gen. Tech. Rep. NE-275. 52 pp. USDA Forest Service, Newtown Square, PA.
DATA ACCESS GUIDELINES
Data Access Guidelines for Streamwater Chemistry


We are happy to share these data on the chemistry of Hubbard Brook ecosystems. The public dissemination of these data that we have collected is a responsibility that we take very seriously. As stewards of these long-term data, our highest priorities are:


a. to maintain the integrity of these long-term data;


b. to allow adequate time for the analysis, quality assurance, and publication of results by principal investigators;


c. to acknowledge properly and responsibly the appropriate funding sources.


Therefore, it is HBES policy to make these streamwater data available on this web page two years after the date of collection. Also, in sharing these data with users like yourself, we ask that you adhere to the following guidelines as a matter of common courtesy and ethical responsibility:


1. Please inform us in advance of your interest and plans for use of these data (likensg@caryinstitute.org).


2. The sources of funding used to collect these data must be acknowledged properly. We will provide the appropriate information when we learn what data are being used.


3. We would like to review any manuscripts that utilize extensive amounts (e.g. multiple years) of these data. If data use is extensive, or if these data have not been published previously, it may be appropriate for us to be included as authors on publication that are generated given the additional requirements from us for analysis and interpretation.



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: valley_stream_chem.txt
Description: Stream chemistry data for Valleywide Study at Hubbard Brook LTER
ColumnVariableDescriptionUnitsCoded?Missing value label
1WATERSHEDWatershed numbernoneynone
2SITE_NOSite of sample collectionnoneynone
3YEARYear of collectionYYYYnnone
4MONTHMonth of collectionMMnnone
5DAYDay of collectionDDnnone
6ESTTime of collection, Eastern Standard Time, 24 hour clock formatHHMMnnone
7VISITSeason of collectionnoneynone
8UTM_EASTEasterly location in UTM based on NAD83meternnone
9UTM_NORTHNortherly location in UTM based on NAD83meternnone
10GPS_ERREstimate of uncertainty of position of GPS receiver.metern
-3
11ELEVElevation (in meters) above MSL, derived from USGS DEMmeternnone
12AREA_HAWatershed area in hectares upstream of sample sitehectaren
-9999.99
13AREA_KM2Watershed area in square kilometers upstream of sample sitekilometerSquaredn
-9999.9999
14CA_CONCcalcium concentration in mg/LmilligramPerLiternnone
15MG_CONCmagnesium concentration in mg/LmilligramPerLiternnone
16K_CONCpotassium concentration in mg/LmilligramPerLiternnone
17NA_CONCsodium concentration in mg/LmilligramPerLiternnone
18Al_M_CONCtotal monomeric aluminum in mg/LmilligramPerLiternnone
19NH4_CONCammonium concentration in mg/LmilligramPerLiternnone
20pHpHdimensionlessnnone
21SO4_CONCsulfate concentration in mg/LmilligramPerLiternnone
22NO3_CONCnitrate concentration in mg/LmilligramPerLiternnone
23CL_CONCchloride concentration in mg/LmilligramPerLiternnone
24PO4_CONCOrtho-phosphate concentration in mg/LmilligramPerLiternnone
25DOC_CONCDissolved organic carbon concentration in mg/LmilligramPerLiternnone
26DIC_CONCDissolved inorganic carbon concentration in mg/LmilligramPerLiternnone
27SIO2_CONCsilicate concentration in mg/LmilligramPerLiternnone
28ANCAcid neutralizing capacity in ueq/LmicroequivalentPerLiternnone
29SPCONDSpecific conductance corrected to 25 degrees celcius in uS/cmmicrosiemensPerCentimetern
-999.9
30TEMPTemperature in degrees celcius measured in stream at time of collectioncelciusnnone

CODES

Variable: WATERSHED
Description:
Watersheds were numbered according to their distance from Mirror Lake. See Methods section for details.
Variable: SITE_NO
Description:
Collection sites numbered every 100 m from the tributary point of entry to Hubbard Brook. See Methods section for details.
Variable: VISIT
Code
Description
1
Spring 2001
2
Fall 2001

MISSING VALUE CODES
Variable
Missing Value Code
Code Explanation
GPS_ERR
-3
Data missing or not taken
AREA_HA
-9999.99
Data missing or not taken
AREA_KM2
-9999.9999
Data missing or not taken
SPCOND
-999.9
Data missing or not taken