Gulf of Maine WBTS CTD Observations
The R/V Gulf Challenger system comprised a Sea-Bird Electronics (SBE) 25Plus CTD, an SBE-55 Sampling Rosette with six four-liter Niskin bottles, a dedicated Hawboldt Industries SPR 1424/S Science winch, and a SBE-33 real-time monitoring and sampling deck unit. The system provided high resolution vertical profiling of hydrographic properties (e.g. conductivity, salinity, temperature). The raw CTD data and bottle trips were acquired by SBE Seasave on a Windows 7 workstation and were processed from hex files to cnv files. Post cruise data processing was completed on a Windows 7 machine running SEABIRD SBE DATA Processing version 7.22.5 At most stations, Niskin bottles were used to capture water samples at depths of 2, 10, 20 and 40 meters. To measure chlorophyll a concentration at discrete depths, duplicate, 100 mL or 500-550 mL subsamples were collected from Nisken bottles at the surface, 10, 20 and 40 meters. Water was filtered immediately on the vessel using glass fiber filters (GF/F) and polycarbonate membrane filters with pore sizes of 0.7 µm and 0.1µm. Chlorophyll a concentrations were calculated were using equations in Strickland and Parsons (1972). Prior to 2014, IOP profilers calibrated annually were used to measure water column stimulated fluorescence along with discrete chlorophyll concentration measurements. After 2014, the nominal chlorophyll a readings from stimulated fluorescence measured with a Wetlabs Wetstar Chorophyll Fluorometer S/N WSS-164 were corrected with chlorophyll concentrations measured from bottle samples.
Data and resources
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ERDDAP's version of the OPeNDAP .html web page for this dataset. Specify a subset of the dataset and download the data via OPeNDAP or in many different file…ERDDAP Open
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ERDDAP's Make-A-Graph .html web page for this dataset. Create an image with a map or graph of a subset of the data.ERDDAP Open
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Background information from the sourceHTML Open
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Background information from the sourceHTML Open
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Background information from the sourceHTML Open
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ERDDAP's tabledap service (a flavor of OPeNDAP) for tabular (sequence) data. Add different extensions (e.g., .html, .graph, .das, .dds) to the base URL for…ERDDAP Open
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Background information from the sourceHTML Open
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An OPeNDAP service for tabular (sequence) data. Add different extensions (e.g., .html, .das, .dds) to the base URL for different purposes.ERDDAP Open
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Background information from the sourceHTML Open
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Web page to facilitate selecting subsets of the datasetERDDAP Open
Additional information
| Temporal extent | 2004-10-29 – 2024-03-14 |
|---|---|
| Date (creation) | 2026-11-04 |
| Status | onGoing |
| Update frequency | asNeeded |
| Metadata language | en |
| License | The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information. |
| Source metadata | ISO 19115 XML |
| Last updated | 2026-11-04 |
| Created | 2026-11-04 |
| API | package_show |