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:MAR-PR-Wtable-T-2013.01
Dataset Title:Marsh water table height, logging data from the Typha marsh site on the upper Parker River for March-November 2013.
Investigator 1: 
First Name:Anne
Last Name:Giblin
Address line 1:Ecosystems Center
Address line 2:MBL
Address line 3:7 MBL St
City:Woods Hole
State:MA
Zip Code:02543
Country:USA
Associate Investigators:Samuel Kelsey
Keywords:PIE LTER, Plum Island Ecosystems, Massachusetts, Parker River, disturbance, estuary, Typha sp., water table, porewater, marsh, elevation
Abstract:Measurements of water table height in the upper Parker River Typha sp. marsh. Measurements were taken every 5 minutes at each logger along a transect of water level loggers running perpendicular to the Parker River bank at the Typha site, MAR-PR-Wtable-T, for Mar - November 2013
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://pie-lter.ecosystems.mbl.edu
DATA FILE INFORMATION:
Data File URL http://ecosystems.mbl.edu/PIE/data/MAR/data/MAR-PR-Wtable-T-2013.csv
Data File Name MAR-PR-Wtable-T-2013
Beginning Date 3/28/2013
End Date 11/6/2013
Number of Data Records 63325
Other Files to Reference
Availability Status Type 1
Quality Control Information
Maintenance Description no new data for 2013, collection done
Log of Changes: Version 01: December 01, 2015, data and metadata created 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
 
RESEARCH LOCATION: MAR-PR-Wtable-T Site 2
Geographic Description Upper Parker river, Typha-dominated marsh edge, PR-21.75 km  
Location Bounding Box    
West Bounding Coordinate    
East Bounding Coordinate    
North Bounding Coordinate    
South Bounding Coordinate    
OR if single point location    
Latitude 42.750869  
Longitude -70.914799  
Elevation    
     
     
 
TAXONOMIC COVERAGE:
Taxonomic Protocols
Organisms studied Typha sp.
 
Methods:A transect of wells is established on the marsh platform, perpendicular to the marsh edge. A total of 5 wells are dug to the depth of the water table under the marsh platform. Wells 1-4 are spaced approximately evenly within the first 5m of marsh edge with well 5 approximately 20m upland from the marsh edge. A water level logger, referred to as the tide gauge, (Onset HOBO U20 series) is placed at the river bottom directly in front of the transect . Individual water level loggers (Onset HOBO U20 series) are used in each well and they measure water height in terms of absolute pressure. Barometric pressure is measured above ground with an additional Onset HOBO U20 series water level logger to tease out the atmospheric pressure from water column pressure. Prior to deployment, each water level logger is sealed in protective plastic whirl-pak bags filled with freshwater, and calibrated to known water depths. Once in the field, water height measurements, in terms of absolute pressure, are recorded every 10 minutes. Pressure readings are uploaded from the HOBO water level loggers using HOBOware software which compensates for temperature, fluid density, and barometric pressure, then are converted to absolute water height above the river bottom. Data is QA/QC'd to ensure that the loggers report the same flood water elevation on the marsh surface. The surface elevation of the marsh as measured by the marsh water level loggers must match that of the gps'd surface elevation. Any corrections made to a particular logger data field (logger # Dc (m)) are reported in the Offset corr field (Offset corr logger # (m)).



Well Location Information:
Logger Well Height of Marsh Surface Above Creek Bottom (m) Horizontal Distance Upland of Creek Edge (m)
1 (tide gauge) 0.00 -10.26
2 1 2.848 0.00
3 2 3.006 2.61
4 3 3.058 5.04
5 4 3.066 7.54
6 5 3.091 20.17

Logger 1 tide gauge located on river bottom.
Marsh wells 1-5, numbered consecutively moving upland.

NOTES AND COMMENTS: Due to occasional equipment malfunction, readings are not continuous throughout the field season. Times in EST.

Procedure for GPS error corrections for 2013 and loggers
 
For an unknown reason, GPS data for the 2013-2014 years has an offset from all previous years.
Below is the procedure I used to account for this offset.
PIE has been taking GPS measurements at these sites for many years.
The same well holes were often used for multiple years (often only the underwater ref logger changed).
I averaged the marsh heights from 2011 and 2012 (which the GPS data are good).
I subtracted the 2013 values from the average 2011/2012 values.
There was a consistent 1.22m difference between them.
To figure the correct marsh height I subtracted 1.22 from each of the 2013 values.
The corrected values are what is used in the 2013 calculations.


For Typha there was an additional factor to consider because the bank collapsed over the winter of 2012 . We Dug two new wells between what was previously known as well T5 and T4 (2012 and prior) Relabelled wells in a poor way! 2012 wells T1 and T2 are gone Well T1 for 2013 is the same well as T3 in 2012, T2=T4, T3 and T4 are new, and T5 is the same as 2012 T5 See field notebook for claification Mar 23, 2013

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 water height measurement (YYYY-MM-DD)   datetime     YYYY-MM-DD NA NA=not available
Time Time of water height measurement (EST, hh:mm)   datetime     hh:mm NA NA=not available
Logger 1(tide gauge) Dc (m) Depth of water (in m) above creek bottom relative to the tide gauge meter ratio   real   NA NA=not available
Offset corr logger 1 (m) corrections made (in m) to match marsh surface elevation to gps elevation meter ratio   real   NA NA=not available
Logger 2 Dc (m) Depth of water (in m) above creek bottom relative to the tide gauge meter ratio   real   NA NA=not available
Offset corr logger 2 (m) corrections made (in m) to match marsh surface elevation to gps elevation meter ratio   real   NA NA=not available
Logger 3 Dc (m) Depth of water (in m) above creek bottom relative to the tide gauge meter ratio   real   NA NA=not available
Offset corr logger 3 (m) corrections made (in m) to match marsh surface elevation to gps elevation meter ratio   real   NA NA=not available
Logger 4 Dc (m) Depth of water (in m) above creek bottom relative to the tide gauge meter ratio   real   NA NA=not available
Offset corr logger 4 (m) corrections made (in m) to match marsh surface elevation to gps elevation meter ratio   real   NA NA=not available
Logger 5 Dc (m) Depth of water (in m) above creek bottom relative to the tide gauge meter ratio   real   NA NA=not available
Offset corr logger 5 (m) corrections made (in m) to match marsh surface elevation to gps elevation meter ratio   real   NA NA=not available
Logger 6 Dc (m) Depth of water (in m) above creek bottom relative to the tide gauge meter ratio   real   NA NA=not available
Offset corr logger 6 (m) corrections made (in m) to match marsh surface elevation to gps elevation meter ratio   real   NA NA=not available