Hubbard Brook Experimental Forest: Mirror Lake Thermal Profiles 1981 - 2011
TITLE
Hubbard Brook Experimental Forest: Mirror Lake Thermal Profiles 1981 - 2011
PRINCIPAL INVESTIGATOR(s)
Gene E. Likens
Cary Institute of Ecosystem Studies
2801 Sharon Turnpike
Millbrook, NY 12545
USA

Phone: (845) 677-5343
OTHERS INVOLVED
Thomas C. Winter (deceased)
ABSTRACT:
Numerous studies have been conducted on Mirror Lake since the mid-1960s, including extensive physical, chemical, biological, and paleoecological research (Likens 1985). This data set includes thermal profiles consisting of temperatures measured at discrete depths. Measurements were made using a hand-held instrument from a boat at an anchored buoy station located at the deepest part (11 m at full pool) of Mirror Lake during the open water (ice-free) season.
KEYWORD SET: Hubbard Brook Ecosystem Study LTER
HBEF Mirror Lake Study, HBR, Hubbard Brook LTER, lake, profile, temperature, thermal.
BEGIN DATE
1981-07-01
END DATE
2011-11-22
LOCATION
Central buoy station on Mirror Lake
West bounding coordinate: -71.696076
East bounding coordinate: -71.689735
North bounding coordinate: 43.945922
South bounding coordinate: 43.940460
LOCATION DESCRIPTION
Water temperature measurements made by hand-held instrument from a boat at an anchored buoy station located at the deepest part (11 m at full pool) of Mirror Lake. The lake is usually ice-covered from about 1 December to about 15 April each year. Bottom sediments at deepest station are soft and organic in nature. Numerous studies have been conducted on Mirror Lake since the mid-1960s, including extensive physical, chemical, biological, and paleoecological research which are described in detail in the book: An Ecosystem Approach to Aquatic Ecology (Likens, 1985).
SAMPLING DESIGN
Temperatures are determined by thermistor probe (Whitney, YSI, or Digisense) which is calibrated to 0.1oC with an NBS-certified, laboratory-grade thermometer, prior to collection on each sampling date. Typically, measurements are made at the surface (<0.05m), and at intervals of 1m below that to the maximum depth obtainable (approximately 10.7m at the buoy station). Deepest measurement is with probe resting on bottom sediments. Thermal data were used in determining annual energy budgets (heat fluxes) as an alternate means of estimating water losses via evaporation, in support of studies of water budgets for Mirror Lake (see Winter et al. (2003).
DATA DESCRIPTION
Thermal profiles consisting of temperatures measured at discrete depths, conducted during the open water (ice-free) season. Depth measurements up to August 1982 were made in feet, and the data arrays converted to meters later, so that recorded depth intervals for these data are not necessarily in whole meters. Data collections by hand from the rowboat were discontinued after 1986 with the installation of an automated, raft-based system. With removal of raft in 1990, profiles were once again collected manually.
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. Gen. Tech. Rep. NE-275. 52 pp.U.S. Department of Agriculture, Forest Service, Northeastern Research Station, Newtown Square, PA.
  • Likens, G.E. 1985. An Ecosystem Approach to Aquatic Ecology: Mirror Lake and its Environment.
  • Sturrock, A.M., Winter, T.C., and Rosenberry, D.O. 1992. Energy Budget Evaporation from Williams Lake: a Closed Lake in North Central Minnesota. Wat. Resour. Res. 28(6):1605-1617.
  • Winter, T.C. 1984. Geohydrologic setting of Mirror Lake, West Thornton, New Hampshire. Water Resour. Investiga. Report 84-4266. 61 pp.U.S. Geological Survey,
  • Winter, T.C., Buso, D.C., Rosenberry, D.O., Likens, G.E., Sturrock, A.M., and Mau, D.P. 2003. Evaporation determined by the energy-budget method for Mirror Lake, New Hampshire. Limnol. Oceanogr. 48:995–1009.
DATA ACCESS GUIDELINES
Data Access Guidelines for Mirror Lake Datasets


We are happy to share these data on the measurement 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 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: mlake-tpro.txt
Description: Mirror Lake thermal profile data
Notes on Data: These samples are physically located at the Robert S. Pierce Laboratory Hubbard Brook Experimental Forest, N. Woodstock, NH.
ColumnVariableDescriptionUnitsCoded?Missing value label
1DATESample dateYYYYMMDDnnone
2ESTEastern Standard Timehhmmnnone
3stageLake stagefootnnone
4.05mDepth interval of .05mcelsiusn
-99.0
50.5mDepth interval of 0.5mcelsiusn
-99.0
60.6mDepth interval of 0.6mcelsiusn
-99.0
71mDepth interval of 1mcelsiusn
-99.0
81.2mDepth interval of 1.2mcelsiusn
-99.0
91.8mDepth interval of 1.8mcelsiusn
-99.0
102mDepth interval of 2mcelsiusn
-99.0
112.4mDepth interval of 2.4mcelsiusn
-99.0
123mDepth interval of 3mcelsiusn
-99.0
134mDepth interval of 4mcelsiusn
-99.0
144.3mDepth interval of 4.3mcelsiusn
-99.0
155mDepth interval of 5mcelsiusn
-99.0
165.5mDepth interval of 5.5mcelsiusn
-99.0
176mDepth interval of 6mcelsiusn
-99.0
186.7mDepth interval of 6.7mcelsiusn
-99.0
197mDepth interval of 7mcelsiusn
-99.0
207.9mDepth interval of 7.9mcelsiusn
-99.0
218mDepth interval of 8mcelsiusn
-99.0
229mDepth interval of 9mcelsiusn
-99.0
239.1mDepth interval of 9.1mcelsiusn
-99.0
2410mDepth interval of 10mcelsiusn
-99.0
2510.7mDepth interval of 10.7mcelsiusn
-99.0


MISSING VALUE CODES
Variable
Missing Value Code
Code Explanation
.05m
-99.0
Data missing or not taken
0.5m
-99.0
Data missing or not taken
0.6m
-99.0
Data missing or not taken
1m
-99.0
Data missing or not taken
1.2m
-99.0
Data missing or not taken
1.8m
-99.0
Data missing or not taken
2m
-99.0
Data missing or not taken
2.4m
-99.0
Data missing or not taken
3m
-99.0
Data missing or not taken
4m
-99.0
Data missing or not taken
4.3m
-99.0
Data missing or not taken
5m
-99.0
Data missing or not taken
5.5m
-99.0
Data missing or not taken
6m
-99.0
Data missing or not taken
6.7m
-99.0
Data missing or not taken
7m
-99.0
Data missing or not taken
7.9m
-99.0
Data missing or not taken
8m
-99.0
Data missing or not taken
9m
-99.0
Data missing or not taken
9.1m
-99.0
Data missing or not taken
10m
-99.0
Data missing or not taken
10.7m
-99.0
Data missing or not taken