Acceptance and utilization of PIE-LTER data requires that:
· The Principal Investigator should be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
· 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.
· A copy of any resultant publications should be sent to:
(Principal Investigator)
Ecosystems Center;
Marine Biological Laboratory
Woods Hole, MA 02543
PLUM ISLAND ECOSYSTEM LTER DATABASE
DATA FILE: Data file is available as an Excel file (version 2000).
DOCUMENTATION FILE: WAT-YSI-SIGMA-timeseries.doc
YEAR: 2001-2002
PI: Charles Vorosmarty
OTHERS: Wilfred Wollheim, Brian Pellerin
BRIEF DESCRIPTION OF DATA FILE: Nutrient grab samples were collected by hand (i.e. not with the Sigma autosampler) on average weekly to monthly between April 2001 and December 2002 at 2 intensively monitered headwater catchments (one suburban and one forested), and at the mouth of the Ipswich and Parker Rivers. 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, and Si at UNH using Lachat methods, with a subset analysed for TDN and DOC.
KEYWORDS: ammonium, dissolved, nitrate, nitrogen, nutrient, phosphate, phosphorus, silicate, organic, carbon
SITE TYPE: Watershed
RESEARCH LOCATION: x and y coordinates (meters) in MA State Plane NAD83. 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 ContributingArea
YSI-SB 225840 919310 Suburban Headwater Stream 3.9
YSI-CC 247680 946790 Forested Headwater Stream 3.8
YSI-IR 232080 923630 Upper Ipswich R. 44.0
YSI-FB 240600 934310 Fish Br. 31.0
IP24 254280 936350 Mouth of the Ipswich (Sylvania Dam) 387
10 246600 944510 Mouth of the Parker (Central St.) 64
EXPERIMENTAL DESIGN AND METHODS: Samples were kept cold until filtered within several days of
collection. Filtered samples frozen
until analysis. Refer to methods.doc
for description of analytical methods and detection limits.
NOTES AND COMMENTS:
VARIABLE DESCRIPTION:
Permanent_ID
= station ID
Grid_Code =
ID used for GIS systems
Lab_ID = ID
used to track sample through lab
DATE =
date (yyyy-mm-dd)
NO3 = nitrate + nitrite (µM)
NH4 = ammonium (µM)
PO4 = soluble reactive phosphorus (µM)
NO2 = nitrite (µM)
Si = dissolved silica (µM)
TDN = total dissolved nitrogen (µM)
DOC =
dissolved organic carbon (µM)
PON=
particulate organic nitrogen (µM)
POC=
particulate organic carbon (µM)
“NA” means the data are not available
CALCULATIONS:
FOR MORE INFORMATION, CONTACT:
Wil Wollheim
Complex Systems Research Center
University of New Hampshire
Durham, NH 03824
OTHER DATA FILES TO REFERENCE: All files with YSI data
REFERENCE CITATIONS:
DATA AVAILABILITY STATUS:
Type 2
ARCHIVE INFORMATION:
Date of entry: January 21, 2004
Data entered by: W. Wollheim
Comments: