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:||Marsh water table height, logging data from the Typha marsh site on the upper Parker River for April-November 2014.|
|Investigator 1:|| |
|Address line 1:||Ecosystems Center|
|Address line 2:||MBL|
|Address line 3:||7 MBL St|
|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 April - November 2014|
|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/MAR/data/MAR-PR-Wtable-T-2014.csv|
|Data File Name||MAR-PR-Wtable-T-2014|
|Number of Data Records||53423|
|Other Files to Reference|
|Availability Status||Type 1|
|Quality Control Information|
|Maintenance Description||no new data for 2014, 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|
|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
2 1 2.848
3 2 3.006
4 3 3.058
5 4 3.066
6 5 3.091
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 2014 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 2014 values from the average 2011/2012 values.
There was a 1.31m difference between them.
To figure the correct marsh height I subtracted 1.31 from each of the 2014 values.
The corrected values are what is used in the 2014 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 2014 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
|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|