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:
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 Title:||Year 2009, measurements of water column depth at 15 minute intervals in the upper Parker River at Middle Road (Thurlow's Bridge), Byfield, MA.|
|Investigator 1:|| |
|Address line 1:||Ecosystems Center|
|Address line 2:||MBL|
|Address line 3:||7 MBLSt|
|Associate Investigators:||Hap Garritt|
|Keywords:||PIE LTER, disturbance, Plum Island Ecosystems, Massachusetts, sea level, tide, water level, depth, Parker River, monitoring|
|Abstract:||Measurements of water column depth at 15 minute intervals in the upper Parker River at Middle Road (Thurlow's Bridge), Byfield, MA, year 2009. Middle Road is located 18.5 km up the estuary from the 0 km reference at the mouth of Plum Island Sound. Water depths are relative to the sonde pressure transducer and are not associated with a datum.|
|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: http://pie-lter.ecosystems.mbl.edu
|DATA FILE INFORMATION:|
|Data File URL||http://ecosystems.mbl.edu/PIE/data/PHY/data/MON-PR-MBWatLevel2009.csv|
|Data File Name||MON-PR-MBWatLevel2009|
|Number of Data Records||18703|
|Other Files to Reference|
|Availability Status||Type 1|
|Quality Control Information|
|Log of Changes:||Version 01: March 5, 2012, updated data and metadata. Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 28/12 8:18 PM for QA/QC to EML 2.1.0|
|Version 02: October 15, 2014, data and metadata comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 6/30/14 11:33 AM for QA/QC to EML 2.1.0|
|RESEARCH LOCATION:||MON-PR-P18.5-MiddleRdBridgeWQ||Site 2|
|Geographic Description||YSI water quality sonde at Middle Rd (Thurlow's Bridge) on Parker River, Byfield, MA|
|Location Bounding Box|
|West Bounding Coordinate|
|East Bounding Coordinate|
|North Bounding Coordinate|
|South Bounding Coordinate|
|OR if single point location|
|Methods:||Measurements are made using a YSI 6600 water quality sonde with internal datalogging capabilities. YSI Sonde water level sensor uses a non-vented** level depth sensor (stainless steel strain gauge).|
**Depth values needed corrections factors applied due to using a non-vented cable with the YSI. Pressure/depth readings needed a post deployment correction to account for changes in ambient atmospheric pressure. Marshview Farm (MFM) weather station 15 minute barometric pressure data was used to compute correction factors at the same time intervals as the 6600 sonde time intervals.
Ambient pressure changes correspond to the following water level changes, 1 mb = 0.0102 meters of water.
To correct our non-vented sonde depth readings for atmospheric pressure effects, we correct the sonde to 1 standard atmosphere (1013 millibars or 760 mm Hg) when we calibrate it, then apply an offset to the depth data (post collection) based on simultaneous measures of barometric pressure
2009 Depth Correction factor calculations for Middle Rd
Sonde is calibrated in air at ambient pressure and should be calibrated to the corresponding depth at pressures relative to 1 ATM (760torr or 1013.25 mBar. 1mB = 0.0102 meters of water, 1 Torr = 1.333224 mB.
If ambient air is 1014.58 mB pressure then sonde should be calibrated to 0.0136 m.
Example table is below.
Ambient ATM (Torr)
Ambient ATM (mB)
For 5/12/2009 the sonde depth was incorrectly calibrated to 0.000(m) instead of 0.0816(m). The error has been corrected/accounted for in the data file.
2009 Sonde Depth calib (m)
Calib ATM (mB)
0.000, should have been (0.0816m)
Using the table above and measured depth data for the corresponding time intervals with pressure units in mB
Corrected depth (m) = (Measured depth + Offset) - ((Measured BAR- std ATM or 1013.25) x 0.0102)
|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||NA||NA = not available|
|Time||Time of sampling (eastern standard time EST)||datetime||hh:mm:ss||NA||NA = not available|
|Station||Name of sampling station||nominal||NA||NA = not available|
|Measured Depth||Water column depth above non vented sonde pressure transducer||meter||ratio||real||NA||NA = not available|
|Depth Offset||Depth correction offset depending on calibration||meter||ratio||real||NA||NA = not available|
|Measured BAR||Barometric pressure from Marshview Farm (MFM) weather station (mbar)||millibar||ratio||real||NA||NA = not available|
|Corrected Depth||Water column depth above non vented sonde pressure transducer, correction factor applied for ambient atmospheric pressure changes||meter||ratio||real||NA||NA = not available|
|Comments||Comments about specific data||nominal||NA||NA = not available|