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Short Citation:
National Centers for Coastal Ocean Science, 2022: Water Stratification Raster Images for the Gulf of Maine, https://www.fisheries.noaa.gov/inport/item/39621.

Item Identification

Title: Water Stratification Raster Images for the Gulf of Maine
Short Name: water_stratification
Status: Completed
Publication Date: 2006
Abstract:

This geodatabase contains seasonal water stratification raster images for the Gulf of Maine. They were created by interpolating water density (sigma t) values at 0 meters and 50 meters binned by season, and subtracting the water density surface at 0 meters from the water density surface at 50 m. This subtraction (as denoted by the raster value) indicates the differences in water density throughout the Gulf of Maine during the year. The more positive or negative the raster value, the larger the difference between the water density raster at 0 m and the water density raster at 50 m and thus, the more stratified the water. Similarly, the closer the raster value is to 0, the smaller the difference between the water density raster at 0 m and the water density raster at 50 m and thus, the less stratified the water. We tried this density difference calculation with 0 and 10 meters as well as 0 and 30 meters. We chose to use 50 meters as the lower water density depth because water less than 10 meters may have been subject to wind and convective mixing, and water less than 30 meters may have been influenced by internal waves. Water at 50 meters, however, illustrated the greatest difference in stratification strength (buoyancy frequency squared) between layers in the water column (Brown and Irish, 1993). The naming convention of the raster includes the year (or years) included in the the interpolation, the season, and the depth (in meters). So for example, the name: ws_1997_2004_Fall would indicate that this water stratification raster was created by subtracting water density rasters that were interpolated using data from 1997-2004 for the fall. The seasons were defined using the same months as the remote sensing data--namely, fall = September, October, November; winter = December, January, February; Spring = March, April, May and Summer = June, July, August.

Purpose:

This data was created in order to support a biogeographic assessment of the Stellwagen Bank National Marine Sanctuary.

Notes:

679

Supplemental Information:

Brown, W.S. and J.D. Irish. 1993. The annual variation of water mass structure in the Gulf of Maine: 1986-1987. Journal of Marine Research. 51:53-107.

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
ISO 19115 Topic Category 014
ISO 19115 Topic Category oceans
NOS Data Explorer Topic Category Environmental Monitoring
NOS Data Explorer Topic Category Tides/Currents
None halocline
None pycnocline
None thermocline
None water density
None water salinity
None water stratification
None water temperature

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None 1912-2004

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None Gulf of Maine
None Stellwagen Bank National Marine Sanctuary

Physical Location

Organization: National Centers for Coastal Ocean Science
City: Silver Spring
State/Province: MD

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: raster digital data
Distribution Liability:

These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data have been used by NOAA, no warranty, expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA in the use of these data or related materials.NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA can not assume liability for and damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.

Data Set Credit: National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program: http://ccma.nos.noaa.gov/about/biogeography/

Support Roles

Data Steward

CC ID: 477117
Date Effective From: 2006
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Distributor

CC ID: 477119
Date Effective From: 2006
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Metadata Contact

CC ID: 477120
Date Effective From: 2006
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Point of Contact

CC ID: 477118
Date Effective From: 2006
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Principal Investigator

CC ID: 477121
Date Effective From: 2006
Date Effective To:
Contact (Person): Costa, Bryan
Email Address: bryan.costa@noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 477124
W° Bound: -72.477168
E° Bound: -59.441365
N° Bound: 46.530855
S° Bound: 36.667053

Extent Group 1 / Time Frame 1

CC ID: 477123
Time Frame Type: Range
Start: 1912
End: 2004

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

Please contact the Stellwagen Banks NMS Research Coordinator for additional information on data access (david.wiley@noaa.gov);

Data Access Constraints:

None.

Data Use Constraints:

None. Acknowledgement of the National Oceanic and Atmospheric Administration, National Ocean Service, National Centers for Coastal Ocean Science, Center for Coastal Monitoring and Assessment, Biogeography Program would be appreciated in products derived from these data.

URLs

URL 1

CC ID: 477115
URL: http://ccma.nos.noaa.gov/ecosystems/sanctuaries/stellwagen_nms/
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 477140
Activity Date/Time: 2013-01-30
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 477139
Activity Date/Time: 2017-04-05
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 586068
Activity Date/Time: 2017-09-13
Description:

Partial upload of Spatial Info section only.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722

Data Quality

Completeness Report:

The spatial distribution of water density measurements varied between seasonal and yearly bins.

Conceptual Consistency:

The accuracy of these water stratification rasters was not assessed. The accuracy of the water density layers on which these water stratification rasters were based, however, were validated. Specifically, 25% of the water density measurements were set aside before the interpolation. After the interpolation, the corresponding validation points were intersected with the interpolated rasters to calculate a simple difference between the observed (validation points) and the predicted (interpolated surface) measurement. These validation points and values are located in the Water_Stratification_Points geodatabase, Validation_Points feature data set.

Lineage

Process Steps

Process Step 1

CC ID: 477113
Description:

Water density rasters were interpolated for each season (winter, spring, summer, fall) from water density (sigma t) point data using a Radial Basis Function (spline with tension) at 0 and 50 meters. The 0 m water density rasters for each season were then subtracted (using the raster calculator in ESRI's Spatial Analyst Extension) from the 50m water density raster. This subtraction (as denoted by the raster value) indicates the differences in water density throughout the Gulf of Maine during the year. The more positive or negative the raster value, the larger the difference between the water density raster at 0 m and the water density raster at 50 m and thus, the more stratified the water. Similarly, the closer the raster value is to 0, the smaller the difference between the water density raster at 0 m and the water density raster at 50 m and thus, the less stratified the water.

Process Date/Time: 2005-12-01 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity Water Stratification Rasters

Catalog Details

Catalog Item ID: 39621
GUID: gov.noaa.nmfs.inport:39621
Metadata Record Created By: Tyler Christensen
Metadata Record Created: 2017-04-05 12:53+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2017-09-13
Owner Org: NCCOS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2017-09-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2018-09-13