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:MON-SO-IBYCYSI2003.01
Dataset Title:Year 2003, 15 minute interval, water quality measurements of water column temperature, salinity, oxygen, and depth near the mouth of Plum Island Sound, Massachusetts
Investigator 1: 
First Name:Charles
Last Name:Hopkinson
Address line 1:Ecosystems Center
Address line 2:MBL
Address line 3:7 MBL
City:Woods Hole
Zip Code:02543
Associate Investigators:Hap Garritt
Keywords:PIE LTER, primary production, disturbance, temperature, oxygen, conductivity, salinity, depth, turbidity, saturation, gas, Plum Island Sound, monitoring
Abstract:Year 2003, 15 minute measurements of water column temperature, salinity, oxygen and depth in Plum Island Sound at the Ipswich Bay Yacht Club, Ipswich, MA.
Contact: Plum Island Ecosystems LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7485
Online URL:
Data File URL
Data File Name MON-SO-IBYCYSI2003
Beginning Date 5/14/2003
End Date 12/23/2003
Number of Data Records 21371
Other Files to Reference
Availability Status Type 1
Quality Control Information
Maintenance Description Complete for 2003
Log of Changes: Version 01: February 22, 2016, data and metadata updates to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2015.xlsm 1/15/15 4:26 PM for QA/QC to EML 2.1.0
Geographic Description PIE YSI water quality, OTT RLS water level and wind sensor station at Ipswich Bay Yacht Club pier, Plum Island Sound, Ipswich, MA  
Location Bounding Box    
West Bounding Coordinate    
East Bounding Coordinate    
North Bounding Coordinate    
South Bounding Coordinate    
OR if single point location    
Latitude 42.708995  
Longitude -70.796577  
Taxonomic Protocols
Organisms studied
Methods:Measurements are made using a YSI 6600 water quality sonde and YSI 6200 Data Collection Platform (DCP) with data radio telemetered to the PIE LTER Rowley field station. YSI Sonde sensors consist of 6562 dissolved oxygen probe (rapid pulse Clark type,polarographic), 6560 conductivity/temperature probe (thermistor), vented level depth sensor (stainless steel strain gauge), 6026 wiping turbidity probe(optical, 90o scatter) and 6025 wiping chlorophyll probe (optical fluorescence).
NOTES AND COMMENTS: Chlorophyll and fluorescence data typically does not calibrate well and data should only be used for relative purposes of looking at highs and lows of phytoplankton blooms not real concentrations.

Missing data or blank values are caused by maintenance time periods or where sensor measurements are obviously wrong in the context of what would be expected. For example, the conductivity sensor has a relatively small opening and chamber for the conductivity electrodes, the estuary can have varying suspended sediment/detrital loads moving in the water column which enter the conductivity cell shorting out the electrodes making a faulty conductivity measurement (lower than expected). Oxygen measurements are dependent upon the conductivity measurements so the oxygen also becomes erroneous. Obvious measurements/data errors have been removed from the data set however the user of this data should also conduct their own data analysis to determine if the data are suitable for their particular situation.

Typical sensor/data problems are:
For oxygen: Fouling of Clark style DO probe where membrane gets a brownish bacterial? film affecting DO sensor readings/calibration checks.
For conductivity: Conductivity cell can have detrital material stuck in it, shorting out cell, resulting in lower than expected conductivity.
For depth: Depth strain gage pressure sensor may come out of the water at low tides resulting in many "zero" depth readings or sometimes negative values.

Data Table

Variable Name Variable Description Units Measurement Scale Code Information Number Type DateTime Format Missing Value Code Missing Value Code Explanation
Date Date of sampling   datetime     DD-MON-YYYY    
Time Time of sampling (eastern standard time EST, 24 hour)   datetime     hh:mm    
Station Name of sampling station   nominal       NA NA = data not available
Temp Temperature of water celsius interval   real   NA NA = data not available
SpCond Specific conductivity of water millisiemenPerCentimeter ratio   real   NA NA = data not available
Salinity Salinity of water partPerThousand interval   real   NA NA = data not available
DO% Percent dissolved oxygen saturation of water percent ratio   real   NA NA = data not available
DO Conc Dissolved oxygen concentration of water milligramPerLiter ratio   real   NA NA = data not available
DO Charge Dissolved oxygen sensor charge dimensionless ratio   real   NA NA = data not available
Depth Water column depth above sonde pressure transducer meter ratio   real   NA NA = data not available
Turbidity Turbidity of water nephelometricturbidityunit ratio   real   NA NA = data not available
Chlorophyll Chlorophyll concentration in water microgramPerLiter ratio   real   NA NA = data not available
Fluorescence Fluorescence of chlorophyll in water percent ratio   real   NA NA = data not available
Comments Comments about specific data   nominal       NA NA = data not available