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Arctic LTER Database

Acceptance and utilization of LTER data requires that:

(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:

Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543

Older Metadata: Attribute table not in XML (EML) file

Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	93n2rnut
Dataset Title:	Depth profiles of NO-3, NH-4 ,PO-4, and particulate phosphorus for Lake N2 reference in 1993, Arctic LTER 1993.
Investigator 1:
First Name:	Mike
Last Name:	Dr.
Address line 1:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:	Neil Bettez, Mark Dornblaser, tech Schwartz
Keywords:	phosphorus, ammonia, nitrite, nitrate, particulate phosphorus, nutrients
Abstract:	Depth profiles of NO-3, NH-4 ,PO-4, and particulate phosphorus for Lake N2 reference in 1993.
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 Name	93n2rnut
Beginning Date	5/1/1993
End Date	9/1/1993
Number of Data Records
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Log of changes: Particulate phosphorus data added in April 1996 by Neil Bettez For Archival Use: DATE RECEIVED: Jan 27, 1995 DATA FILE ENTERED BY: Neil Bettez DATA FILE VALIDATION: NAME: Neil Bettez DATE: Nov, 1994



RESEARCH LOCATION:
Geographic Description	N2 reference
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude
Longitude



TAXONOMIC COVERAGE:
Organisms studied

Methods:	Water samples were collected at depths 0,1,3,5,8,12,16 meters with a Van Dorn. Water was filtered in the field using 47mm .045 um millipore HAE filters. Filterd water was kept at 4C in amber bottles until being run on an ALP chem auto analyzer using methods for Phosphorus, ammonia and nitrate/nitrite. Due to an unsatifactory high detection limit with the autoanalyzer ammonia chemistry was done by hand using Standard methods. Particulate Phosphorus, nitrogen and carbon samples were collected on a pre-combusted 47 mm Gelman AE filter and stored frozen until processing, Filters were then split in half and particulate phosphorus was determined using methods of Stainton et al., (1974). Total N added to 234 lbs. Total H3Po-4 added 14.6 liters. Additions were started 25 June 1993 and continued every three days until July 28 1993. Additions 1-7 consisted of 29 lbs of ammonium nitrate and 1.77 liters PO-4. Additions 8-12 consisted of 7.25 lbs of ammonium nitrate and .44 liters PO-4. The ditribution was 2/3 in the deep portion (north) of the lake and 1/3 in the shallow Notes: Particulate Phosphorus samples were run in 1995 by Neil Bettez Reference Citations: R.G. Wetzel & G.E. Likens. 1979. Limnological Methods. Saunders. Philadelphia. A quantification of low-level ammonia in freshwaters. Standard Methods 1985, p 382. Stainton, M.P. M.J. Capel, F.A.J.1974. Armstrong The chemical Analysis of fresh water. Fish Res. Board Can. Misc.Spec. Pub. 25: 67. 1974. Sampling Description. None

Data Table

Variable	Variable descrip.	Precis./Units		Coded		Missing
(Y/N)		Values
SITE		site of measurement	site code		y
Lake		Lake sampled					n
Depth		depth sampled		meters			n
Number		sample number					n
PO4		phospate		uM/L			n
NO3		nitrate			uM/L			n
NH4		ammonia			uM/L			n
PPO4		Particulate phosphate		ug/L			n	n
PPO4		Particulate phosphate		umol/L			n	n
(12) CALCULATIONS
Variable        Formula