Plum Island Ecosystems 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

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:WAT-YSI-SIGMA-timeseries.01
Dataset Title:Time series of nutrient grab samples from catchments with frequency ranging from weekly to monthly between 2001 and 2006.
Investigator 1: 
First Name:Charles
Last Name:Vorosmarty
Address line 1:Morse Hall
Address line 2:UNH
Address line 3:
City:Durham
State:NH
Zip Code:03824
Country:USA
Investigator 2: 
First Name:Wilfred
Last Name:Wollheim
Address line 1:Morse Hall
Address line 2:UNH
City:Durham
State:NH
Zip Code:03824
Country:USA
Associate Investigators:Brian Pellerin, Joe Thouin
Keywords:PIE LTER, catchments, Plum Island, Massachusetts, ammonium, dissolved, nitrate, nitrogen, nutrient, phosphate, phosphorus, silicate, organic, carbon
Abstract:Time series of nutrient grab samples collected by hand (i.e. not with the Sigma autosampler) with frequency ranging from weekly to monthly between 2001 and 2006. Sites include three headwaters catchments of contrasting land use (forest, urban, wetland), the mouth of the two main watersheds draining to the Plum Island Estuary (Ipswich and Parker R.). An additional time series was collected for a site in the Upper Ipswich at North Reading and at Fish Br. in Boxford – this sampling was ended in 2002. Samples were analysed for NO3, NO2, NH4, PO4, Si, TDN and DOC.
Contact: Plum Island Ecosystems LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7485
Email: pie_im@mbl.edu
Online URL: http://ecosystems.mbl.edu/PIE/
DATA FILE INFORMATION:
Data File URL http://ecosystems.mbl.edu/PIE/data/WAT/data/WAT-YSI-SIGMA-timeseries.dat
Data File Name WAT-YSI-SIGMA-timeseries
Beginning Date 6/12/2001
End Date 7/6/2006
Number of Data Records 419
Other Files to Reference All files with YSI, and nutrient data
Availability Status Type 1
Quality Control Information
Maintenance Description Updated periodically
Log of Changes: 01) 4Oct2007, EML 4-5 level,
RESEARCH LOCATION: Site 1
Geographic Description Watershed, YSI-CC (forest)
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude 42.7692
Longitude -70.9165
Methods:Samples were either kept cold until filtered within several days of collection, or filtered immediated in the field. Filtered samples frozen until analysis. Analysis was conducted at UNH either by the lab of Ted Loder (samples with grid-code = UNH_Grab) at MBL (grid-code = Sigma Grab and Lab_ID = NA) or at UNH by the lab of Bill McDowell (grid-code = Sigma Grab and Lab_ID = McDowell Lab)

Samples were analysed using Lachat methods.

RESEARCH LOCATION: x and y coordinates given below are in MA State Plane NAD83 (meters). Sites were georeferenced to a gridded river network with 120m grid sizes. X and Y coordinates reflect slight shifts to ensure proper placement on the digital river network. Contributing area is listed in km2

Permanent_ID Site X Site Y Description
YSI-SB 225840 919310 Suburban Headwater Stream
YSI-CC 247680 946790 Forested Headwater Stream
YSI-CS Wetland Headwater Stream
YSI-IR 232080 923630 Upper Ipswich R.
YSI-FB 240600 934310 Fish Br.
IP24 254280 936350 Mouth of the Ipswich (Sylvania Dam)
10 246600 944510 Mouth of the Parker (Central St.)

Data Table

Variable Name Variable Description Units Measurement Scale Code Infomation Number Type DateTime Format Missing Value Code Missing Value Code Explanation
Permanent_ID station ID   nominal YSI-CC = Cart Creek (forest) | YS-CS = Cedar Swamp (wetland) | YSI-SB = Saw Mill Br (urban) | IP24 = Ipswich R. Dam Ipswich | 10 = Parker R. Dam Byfield | YSI-IR = upper Ipswich R. in N. Reading | YSI-FB = Fish Br. In Boxford       blank cell
SampleType Identifies the type of sample collected   nominal UNH-GRAB = Grab sample collected by UNH prior to 2003 | Sigma-GRAB = Grab sample collected by either MBL (prior to 2004) or UNH (after 2004)       blank cell
Lab_ID ID used to track sample through lab   nominal PK* = unique sample identifier for samples analysed in the Loder Lab at UNH | McDowellLab_YYYY = analysis at the McDowell Lab in year YYYY | NA = sample analysed at MBL prior to 2003       blank cell
DATE date (yyyy-mm-dd)   datetime     yyyy-mm-dd   blank cell
NO3 nitrate + nitrite-N (µM-N) microMolesPerLiter ratio   real     blank cell
NH4 ammonium-N (µM-N) microMolesPerLiter ratio   real     blank cell
PO4 soluble reactive phosphorus (µM-P) microMolesPerLiter ratio   real     blank cell
NO2 nitrite-N (µM-N) microMolesPerLiter ratio   real     blank cell
Si dissolved silica (µM-S) microMolesPerLiter ratio   real     blank cell
TDN total dissolved nitrogen (µM-N) microMolesPerLiter ratio   real     blank cell
DOC dissolved organic carbon (µM-C) microMolesPerLiter ratio   real     blank cell
PON particulate organic nitrogen (µM-N) microMolesPerLiter ratio   real     blank cell
POC particulate organic carbon (µM-C) microMolesPerLiter ratio   real     blank cell