LTER network Toolik Field Station MBLhome page

Weather at Toolik

Toolik Weather Graphs

Arctic LTER Weather Stations

Toolik Webcam

Animated Gif of yesterday's Webcam

Arctic LTER Inhouse login

Arctic LTER Database

Arctic LTER Database

Conditions of Use

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.

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.

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.

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:2008-2011_Kling_Thermokarst_Chemistry.03
Dataset Title:Chemistry from thermokarst impacted soils, lakes, and streams near Toolik Lake Alaska, 2008-2011.
Investigator 1: 
First Name:George
Last Name:Kling
Organization:University of Michigan
Address line 2:Department of Ecology and Evolutionary Biology
Address line 3:830 North University
City:Ann Arbor
State:MI
Zip Code:48109-1048
Country:United States of America
Investigator 2: 
First Name:Sara
Last Name:Fortin
Organization:University of Michigan
Address line 2:Department of Ecology and Evolutionary Biology
Address line 3:830 North University
City:Ann Arbor
State:MI
Zip Code:48109-1048
Country:United States of America
Investigator 3: 
First Name:Jason
Last Name:Dobkowski
Organization:University of Michigan
Address line 2:Department of Ecology and Evolutionary Biology
Address line 3:830 North University
City:Ann Arbor
State:MI
Zip Code:48109-1048
Country:United States of America
Investigator 4: 
First Name:Cody
Last Name:Johnson
Organization:CH2MHILL POLAR SERVICES
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:
Keywords:inorganic nutrients, nutrients, carbon, nitrogen, phosphorus, DOC, dissolved organic carbon, gas, CO2, CH4, DIC, dissolved inorganic carbon, alkalinity, pH,temperature, conductivity, NH4, TDN, TDP, particulates, PP, PC, PN
Abstract:This file contains data collected from thermokarst impacted soils, lakes, and streams near Toolik Lake Alaska. Data are also presented for experimental manipulations of water (e.g., time course experiments). Sample descriptors include a unique sortchem #, site, date, time, depth, distance, elevation, treatment, date-time, category, and water type (e.g., lake, surface, soil). Physical/chemical measures collected in the field include temperature, conductivity, and pH. Chemical analyses performed later include alkalinity; dissolved inorganic and organic carbon (DIC and DOC); inorganic and total dissolved nutrients (NH4, PO4, NO3, TDN, TDP); particulate carbon, nitrogen, and phosphorus (PC, PN, and PP); cations (Ca, Mg, Na, K, and Si); anions (SO4 and Cl); chlorophyll a, and oxygen. Note that archived data from before the NSF ARCSS-Thermokarst project started in 2009, and funded by NSF from 1988-2008 (e.g., by the NSF ARC LTER), are included in this dataset.
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.10134&urlTail=thermokarst/lakes/data/2008-2011_Kling_Thermokarst_Chemistry.csv
Data File Name 2008-2011_Kling_Thermokarst_Chemistry
Beginning Date 6/29/1988
End Date 8/18/2011
Number of Data Records 567
Other Files to Reference
Availability Status Type 1
Quality Control Information QA/QC protocols follow those found in the Kling Lab Protocol book ( http://www-personal.umich.edu/~gwk )
Maintenance Description
Log of Changes: Version1 (ver1) File created 22 October 2012
Version2 added missing data explianation and corrected file download Url - it had and extra ARC in it. Jiml 23Sep13
Version 3 url corrected after file reorganization (JD 12Dec2013)
 
RESEARCH LOCATION:                                                                    
Location Name NE 14 NE 14 Outlet Milake into NE 14 Yurlake into NE 14 NE 14 Lake Slump Inlet NE 14 Lake Shore Valley of Thermokarst Reference Valley of Thermokarst Impacted Valley of Thermokarst Upper Horn Lake Horn Lake Headwall Horn Lake watertrack Toolik River Toolik River Thermokarst Toolik River Thermokarst Upstream Huryn Slump Huryn Stream Gunsight Mtn TK Gunsight Mtn Lake Gunsight Mtn TK Stream I Minus TK A I Minus TK B I Minus TK C I Minus TK D I Minus TK E I Minus TK F I Minus TK G I Minus TK H I Minus TK I Lake 395 Lake 395 Inlet Lake 395 Thermokarst Galbraith Ice Wedge  
Geographic Description North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northeast of Toolik Lake North Slope of Alaska, northeast of Toolik Lake North Slope of Alaska, northeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, northwest of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake North Slope of Alaska, southeast of Toolik Lake  
Location Bounding Box                                                                    
West Bounding Coordinate                                                                    
East Bounding Coordinate                                                                    
North Bounding Coordinate                                                                    
South Bounding Coordinate                                                                    
OR if single point location                                                                    
Latitude 68.6833333333333 68.674122 68.673757 68.67415 68.677723 68.67777 68.9351005699 68.9613671424 68.9580752246 68.958333333 68.9606914937 68.9605131092 68.6957195839 68.6930183076 68.69138478 68.4702222222 68.4720485745 68.8792652513 68.878 68.8785928953 68.5471957389 68.5476118267 68.54522103 68.544362749 68.5443677101 68.5424293793 68.5434488822 68.5437705412 68.5490420916 68.5259217403 68.5266754108 68.5257800733 68.492899  
Longitude -149.616666666667 -149.62885 -149.618268 -149.618103 -149.624028 -149.624117 -150.683916886 -150.605045671 -150.671940068 -150.302016667 -150.314750352 -150.314822042 -149.202455436 -149.205322847 -149.208236283 -149.34275 -149.340495849 -150.557042647 -150.559 -150.557620917 -149.517129949 -149.521847189 -149.522130842 -149.52213592 -149.520604472 -149.522692841 -149.52264846 -149.522458297 -149.52465851 -149.542873637 -149.542297261 -149.544523307 -149.497746  
Elevation 701 701 701 701 701 701 305 322 304 382 394 392 775 775 783 994 1010 339 332 334 854 842 872 879 880 890 885 883 838 864 865 873 809  
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 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:In general, water samples are collected in polyethylene bottles and filtered in the field then kept cold and dark until analyses. For specific sampling protocols see the LTER Land-Water protocol manual accessible from the Land-Water mainpage on the Arctic LTER web page or at http://www-personal.umich.edu/~gwk and clicking on the protocol link at the bottom of the page. Specific methodologies are described in the protocol book listed above, and a general description is provided below. Information on the precision and limit of detection of analyses is found in the LTER Landwater protocol manual.

Field data for surface sites (soil waters, streams, lakes not sampled from boats) include temperature, conductivity, and pH measured with hand-held Orion or WTW meters. On lakes sampled from a boat we used a Hydrolab Surveyor 4 to measure temperature, conductivity, pH, dissolved oxygen. Electrical conductivity of water samples is reported as Specific conductivity which has been corrected to a temperature of 25degC using a slope of 2% increase per degree C increase.

Sediment traps in lake NE-14:
We deployed two clusters of three sediment traps at a depth of approximately 5 m. Each sediment trap cluster consisted of three 9 cm diameter tubes suspended vertically in the water column approximately 1 m from the bottom of the lake. A single float rope extending from the center of each sediment trap cluster to the surface of the lake marked the location of the trap. Sediment trap clusters were allowed to collect material falling from the water column for durations of 2 to 3 weeks based on how frequently the individual lakes could be accessed with helicopter support. Traps were sampled by carefully raising the trap cluster to the surface and pouring the contents of each sediment trap into a separate 4 L cubitainer. Once each trap was sampled the entire cluster was immediately redeployed at roughly the same location in approximately 5 m of water. Once collected, we returned the water to Toolik Field Station and filtered aliquots through precombusted (500 degrees Celsius for 2 hours),~ 0.7 micrometer pore size, glass fiber filters (Whatman GF/F) for the analysis of percent organic matter, concentrations of particulate carbon, nitrogen and phosphorus, concentrations chlorophyll a and pheophytin, and stable isotopes carbon-13 and nitrogen-15. For analytical methods see ‘Protocols of the Arctic Lakes LTER' http://ecosystems.mbl.edu/ARC/lakes/protocols.html on the Arctic LTER webpage. We calculated bulk sedimentation rate as well as carbon, nitrogen and phosphorus flux rate (mg per m2 per day) by first measuring the mass of bulk particulate matter and macronutrients carbon, nitrogen and phosphorus in each trap (mg), and then dividing by the area of the trap (m2) and the duration that the trap was deployed (d).

General analyses:
Dissolved inorganic nutrients (NH4 and PO4) were analyzed by wet chemistry techniques at Toolik Field Station usually within 24 hours of sampling. Prior to 1999, the phenate method was used to analyze the ammonium content. In the years 1999-2001, a comparison study of the OPA method and the phenate method was performed and starting in 2001 the OPA method was used to analyze ammonium content. Gas samples were analyzed at Toolik Field Station on a Shimadzu GC14 gas chromatograph with TCD and FID detectors. DIC samples were acidified in the field and analyzed on a Shimadzu GC14 gas chromatograph at Toolik Field Station. DOC, TDN, TDP, particulate C, N, P, anions and cations were brought back to the University of Michigan for analysis. DOC and TDN are analyzed on a Shimadzu TOC-Vcph with TN Module. Particulate Carbon and Nitrogen on a Perkin Elmer 2400 CHN analyzer, TDP and Particulate P were digested and run at the University of Michigan on an Alpkem autoanalyzer, NO3 is analyzed by cadmium reduction on an Alpkem autoanalyzer, Cl and SO4 on a Dionex ion chromatograph, and cations on an inductively coupled plasma optical emission spectrometer (ICP-OES). Alkalinity samples were run on a Radiometer autotitrator either at Toolik Field Station or in Michigan. Chla was analyzed in the field using an acetone extraction and analysis on a Turner AU10 Fluorometer.

For all analyses, sample values that were less than zero were assigned a value of zero. A missing value is assigned a "period", " . "

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
SortChem A unique number assigned to each sample collected at a specific site at a specific date and time. The 4-number year (e.g., 2012) that the sample was collected is followed by a dash and then a sequential number. For example, if 600 samples were collected in 2002, then the first sample collected is 2002-0001 and the last sample is 2002-0600. text       .=Missing or Not Measured
Site Site Name. If a soil site, the site is described in the name by general location then specific feature (watertrack,etc) then specific point (1,2,3,...). If a lake or streams site, the lake or stream name (as it is commonly known) is given. Exceptions in naming procedure are provided in the Code Information and in AK-LTER_Site_Info.xls. text       .=Missing or Not Measured
Date Sampling Date datetime   dd-mmm-yy   .=Missing or Not Measured
Time_hr_dst Sampling Time in Alaska Daylight Savings Time using 24 hour convention. Daylight Savings time is 1 hour ahead of Alaska Standard Time: e.g., if time is 13:00 DST then it is 12:00 AST. datetime   hh:mm   .=Missing or Not Measured
Depth_m Depth from surface of lake, stream, or soil number meter     .=Missing or Not Measured
Distance_km Distance along a stream where negative values are upstream of a designated starting point and positive values are downstream of the designated starting point. For soil sites, the distance is the perpendicular distance away from a river bank or lake shore number kilometer     .=Missing or Not Measured
Elevation_m Elevation above sea level number meter     .=Missing or Not Measured
Water_type Water type sampled: text       .=Missing or Not Measured
Description_Treatment Additional information useful for describing a sample. Information would be entered in this column if the sample was part of an experiment, method test, or manipulation. text       .=Missing or Not Measured
Temp_C Sample temperature. number celsius     .=Missing or Not Measured
Cond_uS Specific electrical conductivity of the water sample number microsiemenPerCentimeter     .=Missing or Not Measured
pH pH (opposite of the log of the molar hydrogen ion concentration). number dimensionless     .=Missing or Not Measured
Alk_ueqL Total alkalinity (carbonate and non-carbonate alkalinity). number microequivalentPerLiter     .=Missing or Not Measured
DIC_uM Dissolved inorganic carbon number micromolePerLiter     .=Missing or Not Measured
PCO2_uatm Partial pressure of carbon dioxide number microatmosphere     .=Missing or Not Measured
PCH4_uatm Partial pressure of methane gas number microatmosphere     .=Missing or Not Measured
CO2_uM Dissolved carbon dioxide gas concentration number micromolePerLiter     .=Missing or Not Measured
CH4_uM Dissolved methane gas concentration number micromolePerLiter     .=Missing or Not Measured
DOC_uM Dissolved organic carbon number micromolePerLiter     .=Missing or Not Measured
NH4_phen_uM Ammonium by the phenol method number micromolePerLiter     .=Missing or Not Measured
NH4_OPA_uM Ammonium by the OPA method number micromolePerLiter     .=Missing or Not Measured
PO4_uM Phosphate (Soluble Reactive Phosphorus) number micromolePerLiter     .=Missing or Not Measured
NO3_uM Nitrate (plus Nitrite) number micromolePerLiter     .=Missing or Not Measured
TDN_uM Total dissolved nitrogen number micromolePerLiter     .=Missing or Not Measured
TDP_uM Total dissolved phosphorus number micromolePerLiter     .=Missing or Not Measured
PC_ugL Particulate carbon number micromolePerLiter     .=Missing or Not Measured
PN_ugL Particulate nitrogen number micromolePerLiter     .=Missing or Not Measured
PP_uM Particulate phosphorus number micromolePerLiter     .=Missing or Not Measured
Ca_uM Calcium number micromolePerLiter     .=Missing or Not Measured
Mg_uM Magnesium number micromolePerLiter     .=Missing or Not Measured
Na_uM Sodium number micromolePerLiter     .=Missing or Not Measured
K_uM Potassium number micromolePerLiter     .=Missing or Not Measured
Si_uM Silica number micromolePerLiter     .=Missing or Not Measured
SO4_uM Sulfate number micromolePerLiter     .=Missing or Not Measured
Cl_uM Chloride number micromolePerLiter     .=Missing or Not Measured
Oxygen_mgL Dissolved oxygen number milligramPerLiter     .=Missing or Not Measured
Chla_ugL Fluorescence estimate of Chlorophyll a corrected for phaeopigment (phaeophytin). This acidification method was started in 1999, and applied to all samples analyzed by the LTER Landwater group by 2000. Note that the lakes Arcitc LTER group started this method in 2004. number microgramPerLiter     .=Missing or Not Measured
Phaeopigment_ugL Fluorescence estimate of Phaeopigment estimated by acidification of a chlorophyll sample. number microgramPerLiter     .=Missing or Not Measured
Chla_Raw_ugL Fluorescence estimate of Chlorophyll a without a phaeopigment correction (no acidification). This was the historical measure used by the Arctic LTER at Toolik Lake. Chla_Raw = (((Sample Fluorescence - Blank) * Slope) - Intercept) * (Acetone_ml / Sample Volume Filtered) number microgramPerLiter     .=Missing or Not Measured
secchi_m Secchi depth in meters number meter     .=Missing or Not Measured
Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.