|Title:||Ecological Marine Units: Nutrients|
A compilation of ocean nutrient (nitrate, phosphate, and silicate concentrations) data at ¼ degree spatial resolution for the entire United States Exclusive Economic Zone. The dataset is derived from the ESRI Ecological Marine Unit (EMU) dataset, which was assembled from non-supervised statistical clustering of over 52 million points from NOAA’s World Ocean Atlas (2013) WoA database, an authoritative 57 year archive of global water column data. This derived dataset is divided into three separate point shapefiles, each representing either nitrate, phosphate, or silicate concentrations (all in units of μmol l-1). Values for nutrient concentrations represent a climatological average. Each shapefile is formatted such that a single point location (i.e., unique associated latitude and longitude) contains a unique column entry for a given depth interval. Depth intervals are variable from 5 m near the surface to 100 m in the deeper regions (> 2000 m) for a total of 102 depth levels. All disclaimers provided by the original dataset authors apply to this derived dataset. For detail on these disclaimers, please refer to the following reference: Sayre, R., J. Dangermond, D. Wright, S. Breyer, K. Butler, K. Van Graafeiland, M.J. Costello, P. Harris, K. Goodin, M. Kavanaugh, N. Cressie, J. Guinotte, Z. Basher, P. Halpin, M. Monaco, P. Aniello, C. Frye, D. Stephens, P. Valentine, J. Smith, R. Smith, D.P. VanSistine, J. Cress, H. Warner, C. Brown, J. Steffenson, D. Cribbs, B. Van Esch, D. Hopkins, G. Noll, S. Kopp, and C. Convis. 2017. A New Map of Global Ecological Marine Units – An Environmental Stratification Approach. Washington, DC: American Association of Geographers. 36 pages.
To support ocean planning activities pursuant to the Executive Order Regarding the Ocean Policy to Advance the Economic, Security, and Environmental Interests of the United States, the Energy Policy Act, the National Environmental Policy Act, the Rivers and Harbors Act, and the Coastal Zone Management Act.
|ISO 19115 Topic Category||
|ISO 19115 Topic Category||
|Global Change Master Directory (GCMD) Location Keywords||
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
|None||Exclusive Economic Zone|
|None||Outer Continental Shelf|
|None||United States of America|
Data Set Information
|Data Set Scope Code:||Data Set|
|Maintenance Frequency:||As Needed|
|Data Presentation Form:||Map (digital)|
|Data Set Credit:||Bureau of Ocean Energy Management, NOAA Office for Coastal Management, NOAA National Centers for Coastal Ocean Science, Esri|
Point of Contact
|Date Effective From:||2018-06|
|Date Effective To:|
|Contact (Organization):||NOAA Office for Coastal Management (NOAA/OCM)|
2234 South Hobson Ave
Charleston, SC 29405-2413
|Currentness Reference:||Publication Date|
Extent Group 1
Extent Group 1 / Geographic Area 1
|Data Use Constraints:||
For coastal and ocean planning
Version 6.2 (Build 9200) ; Esri ArcGIS 10.5.1.7333
The attributes in this dataset are believed to be accurate.
|Horizontal Positional Accuracy:||
Maximum scale of intended use is 1:80,000.
Spatial and attribute properties are believed to be complete, although attribute information has been simplified. Geometric thresholds from original data are preserved. No tests have been completed for exhaustiveness.
These data are believed to be logically consistent. Geometry is topologically clean.
Esri Ecological Marine Unit (EMU) dataset for Nitrate
|Extent Start Date/Time:||2018-08-01|
|Citation URL Name:||Source Online Linkage|
|Citation URL Description:||
URL where the source data were originally accessed.
Esri Ecological Marine Unit (EMU) dataset
Process Step 1
(1) ESRI Ecological Marine Units data clipped to the boundaries of the United States Exclusive Economic Zone were provided by Keith VanGraafeiland (ESRI). Data were provided in a large point shapefile format with multiple points associated with a single latitude and longitude location. Original attribute fields included those representing depth, unique ecological marine units, nutrients (nitrates, phosphates, silicates), temperature, salinity, dissolved oxygen, among other related fields. (2) Data were re-shaped into a single point shapefile for each nutrient parameter (i.e., nitrates, phosphates, silicates). These shapefiles contain a unique point representing each single latitude and longitude location. Each shapefile contains two unique identifier attributes: FID and QtrDegreeI. QtrDegreeI allows each unique point location to be referenced back to the original ESRI Ecological Marine Units Dataset. Attribute fields for nutrient concentrations at depth were added for each point within the shapefile. These fields were derived from the original dataset and represent nutrient concentrations within each depth interval (e.g., N_001-N_101 wherein N_001 represents nutrient concentrations for waters between 0 and 5 m depth).
|Process Date/Time:||2018-08-01 00:00:00|
Rubric scores updated every 15m
|Entity||Ecological Marine Units: Nutrients|
|Catalog Item ID:||66135|
|Metadata Record Created By:||Brianna Key|
|Metadata Record Created:||2021-12-22 03:24+0000|
|Metadata Record Last Modified By:||SysAdmin InPortAdmin|
|Metadata Record Last Modified:||2023-05-30 18:10+0000|
|Metadata Record Published:||2021-12-22|
|Metadata Publication Status:||Published Externally|
|Do Not Publish?:||N|
|Metadata Last Review Date:||2021-12-22|
|Metadata Review Frequency:||1 Year|
|Metadata Next Review Date:||2022-12-22|