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C-215 Cruise Report

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C-215 Cruise Report CRUISE REPORT C215 Scientific data collected aboard SSV Corwith Cramer Key West, Florida – Freeport, Bahamas – Samana, Dominican Republic – Silver Bank, Dominican Republic – Key West, Florida 13 February – 21 March, 2008 Windrows of Sargassum weed. Photo by Jeff Schell Sea Education Association Woods Hole, Massachusetts Contact Information: Dr. Jeffrey M. Schell Sea Education Association P.O. Box 6 Woods Hole, MA 02543 508-540-3954 (phone) 800-552-3633 (phone) 508-457-4673 (fax) www.sea.edu Table of Contents Table 1 Ship’s Company 2 Data 3 Description Figure 1 Cruise track 4 Table 2 Summary of oceanographic sampling stations 5-6 Figure 2a Surface water hydrographic regions 7 Figure 2b Surface TS plot and Chlorophyll-a Fluorescence (XYZ plot) 8 Table 3 Surface Station data 9-10 Table 4 CTD station data 11 Table 5 Hydrocast station data 12-13 Figure 3 Water Column TS plot 14 Figure 4a CTD cross-section plot: South to East Florida Shelf and Gulf Stream 15 Figure 4b CTD cross-section plot: NW Sargasso Sea-eddy field 16 Figure 4c CTD cross-section plot: SW Sargasso Sea-eddy field 17 Figure 5a ADCP cross-section plot: South to East Florida Shelf and Gulf Stream 18 Figure 5b ADCP surface current vectors: South to East Florida Shelf and Gulf Stream 19 Figure 6a ADCP cross-section plot: NW and SW Sargasso Sea-eddy fields 20 Figure 6b ADCP surface current vectors: NW Sargasso Sea-eddy field 21 Figure 6c ADCP surface current vectors: SW Sargasso Sea-eddy field 22 Table 6a-b Neuston net station data 23-25 Table 7a-b Meter net station data 26 Table 8a-b Zooplankton 100 count data 27-28 Table 9 Dip net station data 29-30 Table 10 Sediment station data 31 Table 11 Student Research Topics 32 Table 1. C215 Ship’s crew and student participants Nautical Staff Beth Doxsee Captain Carl Herzog Chief Mate Lix Maloney 2nd Mate Sandy Alesworth 3rd Mate Marshall Frye Engineer Sarah Austin Steward Emily Williams Asst Steward Nick Anderson Asst Steward Scientific Staff Jeff Schell Chief Scientist Jim Foley 1st Scientist Nik Shonka 2nd Scientist Maia Theophanis 3rd Scientist Videographers Ryan Maneri Executive Producer Eric Bendick Sound and Lighting Students Gregory Ardini Roger Williams University Etan Brandt-Finell University of Colorado, Boulder Meredith Briand St. Francis Xavier University Shandy Buckley University of Hawaii, Manoa Derek Castro Bowdoin College Jacqueline Feurer SUNY Plattsburg Margaret Garascia Wellesley College Anna Hertzberg Oberlin College Morgan Kelly Lynchburg College Jessica McDermott Binghamton University Kathleen Murphy University of Denver Elizabeth Nguyen Carleton College Allison Pfeiffer Carleton College Zara Pickett Santa Rosa Junior College Elizabeth Stivison Wesleyan University Emily Thiem Lawrence University Brittany Vannoy University of Denver Charley Willison Delta College 2 Data Description This cruise report provides a record of data collected during the cruise C215 aboard the SSV Corwith Cramer to and from Key West, Florida with stops in Freeport, Bahamas and Samana, Dominican Republic, and Silver Bank, Dominican Republic (Figure 1). We collected data with 79 individual deployments from 55 discrete stations (Table 2) along our cruise track. In addition we continuously sampled water depth, sub-bottom profiles and Acoustic Doppler Current Profiles (ADCP) along with flow-through sea surface temperature, salinity and in vivo fluorescence. This report summarizes physical, chemical and biological characteristics along our cruise track and around surveyed island and carbonate bank systems. The C215 cruise track traversed several oceanic regions that can be distinguished by their sea surface temperature, salinity, and chlorophyll-a fluorescence values (Figures 2a-b). Periodic surface nutrient and extracted chlorophyll-a was also measured (Table 3). Sub-surface water masses and their chemical properties were also surveyed using a 12 bottle carousel equipped with a CTD and various instruments (Tables 4 and 5). Large scale hydrography are summarized by TS and contour plots of temperature, salinity, density and in vivo chlorophyll-a fluorescence along our cruise track (Figure 3) and for specific transects across key oceanic features (Figures 4a-c). Oceanic currents are summarized by contour (magnitude and direction) and surface vector plots for important geographic regions: Florida Straits and Gulf Stream (Figures 5a-b) and NW and SW Sargasso Sea (Figures 6a-c). Frequent collections of zooplankton and micronekton communities were conducted using a neuston net (Tables 6a-b), and various meter nets (Tables 7a-b). Zooplankton diversity and taxa composition was examined for all nets (Tables 8a-b). Collection of Sargassum weed and associated community of organisms occurred regularly (Table 9). A detailed analysis of mobile and sessile fauna; as well nutrient enrichment experiments, were performed for various student projects. This data is available upon request. In addition, vertical and horizontal distribution patterns of myctophids (lantern fish), and the marine insect Halobates were studied in relation to environmental characteristics. Results, not reported here, are available upon request through SEA. In collaboration with Dr. Peter deMenocol (Lahmont Doherty Earth Observatory) and as part of various student projects, seafloor sediments were collected using either a shipek grab or gravity core. Brief qualitative descriptions of sediments are provided (Table 10); however, additional data (grain size and foraminifera counts) are available upon request. Additional CTD, CHIRP, ADCP and biological data not reported here are available on request through Sea Education Association (SEA) and the Chief Scientist. The information in this report is not intended to represent final interpretation of the data and should not be excerpted or cited without written permission from SEA. As part of SEA’s educational program, undergraduates conducted independent oceanographic research during the cruise. Project explored regionally, relevant topics in the disciplines of physical, chemical, biological and geological oceanography (Table 11). Student research efforts culminated in a written report and public presentation to the ship’s company. These papers are available on request from SEA. Jeff Schell Chief Scientist C215 3 Figure 1. Final cruise track for C215 based on hourly (local time) positions. Oceanic biomes recognized during C215 include the Florida Straits, a narrow and shallow channel dominated by the Florida Current/Gulf Stream; that separates the Florida continental shelf from the carbonate platforms of the Bahamas Banks. Blake Plateau, a drowned/sediment starved carbonate platform, the NW and SW portions of the Sargasso Sea, the NW Providence Channel separating the predominate banks of the Bahamian platform, the SE banks of the Bahama Platform (Silver Bank), and Samana Bay, Dominican Republic. Blake Plateau North NW Sargasso Atlantic Sea Freeport FL Straits / Gulf Stream Key West NW SW Providence Sargasso Channel Sea Silver Bank Samana 4 Table 2. Summary of oceanographic sampling stations for C215. Station # Date Time Log (nm) Lat (dec Lon (dec Location Station (C215-) (2008) (local +4 Deg N) Deg W) Type GMT) 001 14-Feb 1543 0 24.5 -81.8 South Florida Shelf HC 001 14-Feb 1611 0 24.52 -81.81 South Florida Shelf NT 001 14-Feb 1530 0 24.53 -81.82 South Florida Shelf SG 002 15-Feb 1103 2 24.46 -81.80 South Florida Shelf DN 003 15-Feb 1332 12 24.37 -81.64 South Florida Shelf CTD 004 16-Feb 0000 58 24.50 -81.23 South Florida Shelf CTD 004 16-Feb 0052 58 24.49 -81.24 South Florida Shelf NT 005 16-Feb 0848 71 24.27 -80.98 South Florida Shelf DN 006 16-Feb 1549 94 24.62 -80.72 South Florida Shelf CTD 007 16-Feb 2353 119 24.76 -80.55 South Florida Shelf CTD 008 17-Feb 0740 152 24.91 -80.41 South Florida Shelf DN 009 17-Feb 1045 161 24.85 -80.41 South Florida Shelf DN 009 17-Feb 1023 161 24.8 -80.4 South Florida Shelf HC 009 17-Feb 1058 161 24.85 -80.41 South Florida Shelf NT 009 17-Feb 1023 161 24.84 -80.39 South Florida Shelf SG 010 17-Feb 1636 177 24.70 -80.49 South Florida Shelf DN 011 18-Feb 0507 214 25.94 -79.75 Florida Current CTD 012 18-Feb 1809 258 27.2 -79.9 East Florida Shelf HC 012 18-Feb 1809 258 27.18 -79.93 East Florida Shelf SG 013 18-Feb 2135 268 27.66 -79.96 East Florida Shelf NT 014 19-Feb 0940 298 28.40 -79.92 East Florida Shelf CTD 014 19-Feb 0940 298 28.4 -79.9 East Florida Shelf HC 014 19-Feb 1005 298 28.49 -79.91 East Florida shelf PN 015 19-Feb 1448 325 28.2 -80.1 East Florida Shelf HC 015 19-Feb 1448 325 28.24 -80.12 East Florida Shelf SG 016 19-Feb 1815 340 28.3 -79.9 East Florida Shelf HC 016 19-Feb 1815 340 28.30 -79.90 East Florida Shelf SG 017 19-Feb 2219 355 28.38 -79.74 Florida Current NT 018 20-Feb 0547 381 28.52 -79.30 Florida Current NT 019 20-Feb 1019 391 28.44 -79.13 Blake Plateau CTD 020 20-Feb 1747 401 28.33 -79.09 Blake Plateau SG 021 21-Feb 0001 402 28.50 -78.97 Blake Plateau NT 022 21-Feb 0810 412 28.72 -78.66 Blake Plateau DN 023 21-Feb 1154 415 28.76 78.68 Blake Plateau GC 023 21-Feb 1032 414 28.77 -78.64 Blake Plateau SG 024 22-Feb 1624 515 29.14 -77.15 Blake Plateau CTD 025 23-Feb 0545 542 28.91 -76.57 Sargasso Sea CTD 026 23-Feb 1730 574 28.26 -76.24 Sargasso Sea CTD 027 24-Feb 0020 592 27.76 -76.27 Sargasso Sea NT 028 24-Feb 0928 636 26.96 -76.50 Sargasso Sea DN 029 25-Feb 1140 783 26.52 -78.78 NW Providence Channel DN 030 27-Feb 0207 894 26.12 -78.23 NW Providence Channel CTD 030 27-Feb 0120 894 26.09 -78.23 NW Providence Channel SG 031 27-Feb 0828 912 26.01 -77.88 NW Providence Channel DN
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