Arctic LTER Database

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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, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite 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. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm http://ecosystems.mbl.edu/arc/terrest/biomass/index.shtml 

4 ) Acknowledgement. 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 significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

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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.

Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	2007AKLakes_physcem.03
Dataset Title:	Physical and chemical data for various lakes near Toolik Research Station, Arctic LTER Summer 2007.
Investigator 1:
First Name:	Anne
Last Name:	Giblin
Organization:	Marine Biological Laboratory
Address line 2:	Ecosystems Center
Address line 3:	7 MBL Street
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	United States of America
Investigator 2:
First Name:	Christopher
Last Name:	Luecke
Organization:	Utah State University
Address line 2:	Department of Watershed Science
Address line 3:
City:	Logan
State:	UT
Zip Code:	84322-5210
Country:	United States of America
Investigator 3:
First Name:	George
Last Name:	Kling
Organization:	University of Michigan
Address line 2:	Department of Ecology and Evolutionary Biology
City:	Ann Arbor
State:	MI
Zip Code:	48109-1048
Country:	United States of America
Investigator 4:
First Name:	Taylor
Last Name:	Heyl
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Investigator 5:
First Name:	Jeremy
Last Name:	Mears
Associate Investigators:
Keywords:	chemistry, hydrolab, depth, pH, conductivity, temperature, PAR, light, dissolved oxygen, DO, chlorophyll, chlorophyll a, aquatic, aquatic ecosystems, arctic, freshwater, irradiance, lakes, limnology, oxygen, photosynthetically active radiation, physical, specific conductivity,
Abstract:	Yearly file describing the physical/chemical values recorded at various lakes near Toolik Research Station. Sample site descriptors include site, date, time, depth. Depth profiles of physical measures collected in situwith Hydrolab Datasonde in the field include temperature, conductivity, pH, dissolved oxygen in both percent saturation and mg/l, SCUFA chlorophyll-a values in both volts and µg/l, and PAR.
For questions about the Metadata and data contact the Investigators. For information about this web site contact:	Arctic LTER Information Manager The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole, MA 02543 Phone (508) 289 7496 Email: arc_im@mbl.edu Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File URL	http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10073&urlTail=lakes/physchem/data/2007_ArcticLTER_Lakes_physcem.csv
Data File Name	2007_ArcticLTER_Lakes_physcem
Beginning Date	6/20/2007
End Date	9/28/2007
Number of Data Records	793
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Entered metadata into new metadata form.
	Version 2: Updated metadata form to newer version (without site sheet). Updated units to current standards. CH 6Feb2013
	Version 3: Updated metadata form to newer version with site sheet. CH March 2013.

RESEARCH LOCATION:
Location Name	Toolik Central	E 01	E 05	E 06	I1	I2	I3	I4	I5	I6	I6 headwater lake	I7	I8	I swamp	N 01	N 02	S 06	S 07	NE 9B	Fog lake 2	Fog lake 4
Geographic Description	Toolik Lake, Main Station	Lake E1	Lake E5	Lake E6	Lake I1	Lake I2	Lake I3	Lake I4	Lake I5	Lake I6	Lake I6 Headwaters	Lake I7	Lake I8	Lake ISwamp	Lake N1	Lake N2	Lake S6	Lake S7	Lake NE9B	Fog 2	Fog 4
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude	68.629961	68.6261956028	68.642611	68.6434270583	68.5687130789	68.5713195633	68.5755366301	68.57956715	68.5873874391	68.5965924039	68.582062	68.6008747982	68.6101575207	68.610781	68.6398939358	68.6409472345	68.6293797816	68.6300627447	68.6526454831	68.6833333333333	68.68
Longitude	-149.612633	-149.555347706	-149.458079	-149.440564592	-149.58807625	-149.565881618	-149.583644456	-149.58405938	-149.589625877	-149.59264335	-149.622932	-149.596582063	-149.582211513	-149.600742	-149.606965643	-149.625086307	-149.641623295	-149.644441789	-149.599473662	-149.1	-149.071666666667
Elevation	719	762	800	792	785	785	774	770	767	754	806	742	744	736	731	724	731	731	747	785	754
Link to Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map	View on Google Map

TAXONOMIC COVERAGE:
Organisms studied
Methods:	For field work and sampling protocols see "Sampling and Field Methods Protocol" on The Arctic LTER webpage (http://ecosystems.mbl.edu/ARC/) specific link found below. All measurements were taken with a DS5 Hydrolab Datasonde. Depth reading on sonde was calibrated in the field so that a depth of 0m was the water surface. For profiles, measurements were taken at surface (~0m), at ~0.5m depth, at ~1m of depth, then at 1m intervals until bottom. Measurements were recorded on a Surveyor 4a datalogger and also recorded in a field book. Values recovered from the Surveyor 4a datalogger were used except where values were either missing or highly suspect, in which case values from the fieldbook were used and noted under the "Notes" column. This file was created from a working file titled "2007AKLakes". History of the file is listed below: Date User Changes/Corrections 4-Oct-07 Started 2005AKLakes file, added Physchem. ran basic checks (lter#, depth, date, lake name match) 6-Oct-07 Imported Filterbook for Chl a sample data 11-Oct-07 Detailed check of hydrolab data, red-flagged areas that may not be reliable 28-Feb-07 Entered depths for E5 and N1, some look ok but N1 no way to be sure depths were correct. Also entered correct names for S lakes 3-Jun-08 Entered Nitrate data, I changed date formats and corrected dates, added dates (8/15/07) for E5 and E6, added dates to S-series lakes, added August and Sept dates to Toolik samples 4-Jun-08 Entered phosphate and ammonium data 29-Sep-08 Entered corrected GFC Chlorophyll and pheophytin - original values were calculated with improper calculations Removed extraneous rows from nutrient worksheet 30-Sep-08 Checked for missing Chl-a, NH4, SRP, and NO3 data on Nutrients07 worksheet and added coments for missing data Some of the missing SRP and NH4 samples may be frozen and stored in MBL -20 freezer Reconciled I-Series metalimnion sample depths with what is recorded in 2007 field book 24-Oct-08 Replaced Hydrolab data on "Physchem07" worksheet with data from the file: 2007_Hydrolab_bysite where I had eliminated rundunent data, corrected SCUFA chlorophyll values, added coments and improved the quality of the data. 25-Oct-08 Added 2007 SortChem numbers to nutrient samples - I got the SortChem numbers from 2007 AKCHEM file 13-Jan-09 Following consultation with AGiblin switched Chlorophyll GFC to GFF on Nutrient07 page

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
Site	Site Name: Name of the lake where measurements were taken. There are discrete sampling sites defined by water depth, generally they are at the point of maximum depth.	text			Toolik Main= the main sampling station on Toolik Lake's largest basin| E= lakes of the E-Series| I=lakes of the I-Series| N=lakes of the N-Series| S=lakes of the S-Series| Fog=lakes of the Fog-Series
Date	Date readings were taken on.	datetime		dd-mmm-yyyy
Time_hr_dst	Exact time that each reading was recorded in Alaska Daylight Savings Time (1 hour ahead of Alaska Standard Time: if 13:00 DST than 12:00 AST)	datetime		hh:mm:ss		.
IBVSvr4a_V	Internal Battery Voltage of the Surveyor 4a Datalogger.	number	volt			.
Temp_C	Water temperature at depth.	number	celsius			.
Cond_uS	Electrical conductivity of the water at depth.	number	microsiemenPerCentimeter			.
Dep_m	Depth of water measurement taken at starting from the surface as 0.	number	meter			.
pH	pH (opposite of the log of the hydrogen ion concentration).	number	dimensionless			.
DO_Sat	The percent saturation of dissolved oxygen at depth.	number	percent			.
DO_mg/l	The concentration of dissolved oxygen at depth.	number	milligramPerLiter			.
Chl_V	In Vivo measurement of chlorophyll-a concentration.	number	volt			.
Chl_ug/l	In Vivo measurement of chlorophyll-a concentration.	number	microgramPerLiter			.
PAR_uEm2s	PAR (photosynthetically active radiation) measured below the water surface.	number	microEinsteinPerMeterSquaredPerSecond			.
refPAR_uEm2s	PAR (photosynthetically active radiation) measured with Deck unit to correct for changes in ambient light.	number	microEinsteinPerMeterSquaredPerSecond			.
Secchi_m	Measure of water transparency by depth a Secchi Disk is visible to.	number	meter			.
Hydrolab	This field indicates which Hydrolab Datasonde instrument was used to take measurements	text			1=Arctic LTER Hydrolab Datasonde DS5| 2=Toolik Field Station Datasonde DS5
Notes	Any additional information pertaining to measurments made for a particular depth, place and time.	text				.
	Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.