Water Stratification Raster Images for the Gulf of Maine
National Centers for Coastal Ocean Science
Data Set
(DS)
| ID: 39621
| Published / External
Created: 2017-04-05
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Last Modified: 2023-05-30
Project (PRJ) | ID: 37203
ID: 39621
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | Water Stratification Raster Images for the Gulf of Maine |
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Short Name | water_stratification |
* Status | Completed |
Creation Date | |
Revision Date | |
• 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 |
Other Citation Details | |
• 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. |
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Keywords
Theme Keywords
Thesaurus | Keyword |
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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 |
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None | 1912-2004 |
* Spatial Keywords
Thesaurus | Keyword |
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None | Gulf of Maine |
None | Stellwagen Bank National Marine Sanctuary |
Stratum Keywords
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Platform Keywords
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Physical Location
• » Organization | National Centers for Coastal Ocean Science |
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• » City | Silver Spring |
• » State/Province | MD |
• Country | |
• » Location Description |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | |
• Maintenance Frequency | None Planned |
Maintenance Note | |
» Data Presentation Form | raster digital data |
• Entity Attribute Overview | |
Entity Attribute Detail Citation | |
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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
* » Support Role | Data Steward |
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* » Date Effective From | 2006 |
Date Effective To | |
Position | NCCOS Scientific Data Coordinator |
Email Address | NCCOS.data@noaa.gov |
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URL | |
Business Hours | |
Contact Instructions |
* » Support Role | Distributor |
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* » Date Effective From | 2006 |
Date Effective To | |
Position | NCCOS Scientific Data Coordinator |
Email Address | NCCOS.data@noaa.gov |
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Contact Instructions |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2006 |
Date Effective To | |
Position | NCCOS Scientific Data Coordinator |
Email Address | NCCOS.data@noaa.gov |
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Contact Instructions |
* » Support Role | Point of Contact |
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* » Date Effective From | 2006 |
Date Effective To | |
Position | NCCOS Scientific Data Coordinator |
Email Address | NCCOS.data@noaa.gov |
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Contact Instructions |
* » Support Role | Principal Investigator |
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* » Date Effective From | 2006 |
Date Effective To | |
Person | Costa, Bryan |
Email Address | bryan.costa@noaa.gov |
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Extents
Currentness Reference | Ground Condition |
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Extent Group 1
Extent Description |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -72.477168 |
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* » E° Bound | -59.441365 |
* » N° Bound | 46.530855 |
* » S° Bound | 36.667053 |
* » Description |
Extent Group 1 / Vertical Extent
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Extent Group 1 / Time Frame 1
* » Time Frame Type | Range |
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* » Start | 1912 |
End | 2004 |
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Spatial Information
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Spatial Representation
Grid Representation Used? | Yes |
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Access Information
* » Security Class | Unclassified |
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* Security Classification System | |
Security Handling Description | |
• Data Access Policy | |
» 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. |
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Distribution Information
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URLs
URL | http://ccma.nos.noaa.gov/ecosystems/sanctuaries/stellwagen_nms/ |
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URL Type | Online Resource |
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Activity Log
Activity Time | 2013-01-30 |
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Description |
Date that the source FGDC record was last modified. |
Activity Time | 2017-04-05 |
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Responsible Party | |
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 Time | 2017-09-13 |
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Description |
Partial upload of Spatial Info section only. |
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Issues
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Technical Environment
Description |
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 |
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Data Quality
Representativeness | |
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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. |
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Data Management
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» Do these Data Comply with the Data Access Directive? | |
» Is Access to the Data Limited Based on an Approved Waiver? | |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed |
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» Actual or Planned Long-Term Data Archive Location | |
» If World Data Center or Other, Specify | |
» If To Be Determined, Unable to Archive, or No Archiving Intended, Explain |
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» Approximate Delay Between Data Collection and Archiving | |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
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Lineage
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Sources
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Process Steps
Process Step Number | 1 |
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» 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 |
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Acquisition Information
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FAQs
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Child Items
Rubric scores updated every 15m
Score | Type | Title |
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Entity (ENT) | Water Stratification Rasters | |
Related Items
Item Type | Relationship Type | Title |
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Catalog Details
Catalog Item ID | 39621 |
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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 | 2023-05-30 18:10+0000 |
Metadata Record Published | 2017-09-13 |
Owner Org | NCCOS |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2017-09-13 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2018-09-13 |
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