Invitational Sail Cruise Report Cruise C-268A

Transcription

1 Invitational Sail Cruise Report Cruise C-268A Scientific Data Collected Aboard SSV Corwith Cramer Cádiz, Spain Alicante, Spain August 8, 2016 August 15, 2016 Sea Education Association Woods Hole, Massachusetts

2 Cover photo caption: Sunset from the SSV Corwith Cramer. This document should be cited as: Meyer, Audrey Final report for S.E.A. Cruise C-268A. Sea Education Association, Woods Hole, MA To obtain unpublished data, contact the SEA data archivist: Data Archivist Sea Education Association PO Box 6 Woods Hole, MA Phone: Fax: data-archives@sea.edu Web: 2

3 Table of Contents Ship s Company Introduction Data Description Figure 1. C-268A Hourly Positions Table 1. Oceanographic Sampling Stations Table 2. Neuston Net Data Table count Data of Neuston Net Sample

4 C-268A Ship s Company, SSV Corwith Cramer SEA Faculty, Staff, and Crew Chris Nolan Scott Spillias Allison Taylor Rocky Bonner Tanner Tillotson Alex Myers Willie Hatfield Erin Johnson Nina Whittaker Abby Cazeault Nick Dragone Steve Kielar Kata Rolf Coutney Moore Leona Waller Margaret Brandon Monica Bowman Master/Nautical Science Faculty Chief Mate Second Mate Third Mate Engineer Engineer Assistant Engineer Steward Assistant Steward First Assistant Scientist Second Assistant Scientist Third Assistant Scientist Sailing Intern Sailing Intern Sailing Intern SEA President SEA Director of Stewardship Invited Participants Ellen Cost Richard Cost Kathleen Joseph Ellen Reinhart Christopher Lynch Margaret Lynch Jeremy Salesin Katherine Salesin 4

5 Introduction This cruise report provides a summary of scientific activities aboard the SSV Corwith Cramer during Cruise C-268A (August 8, 2016 August 15, 2016). This was an SEA Invitational Sail, during which invited participants sailed from Cádiz, Spain to Alicante, Spain, with brief overnight stops in Málaga and Cartagena. While onboard the ship, the participants shared the experience of sailing and shipboard life and learned about SEA and SEA s academic programs. True to SEA and SEA Semester, they became part of the crew and stood watch, handled sail, navigated, steered, performed boat checks, and helped in the science lab and galley. Scientific sampling was conducted throughout the cruise in easternmost Atlantic Ocean and western Mediterranean Sea waters. Data Description This section provides a record of data collected aboard SSV Corwith Cramer Cruise C-268A, which departed from Cádiz, Spain and voyaged through the Straits of Gibraltar and along the Spanish Mediterranean coast for approximately 475nm before ending in Alicante, Spain (Figure 1). Figure 1. Hourly positions along the C-268A cruise track. 5

6 During the 8-day cruise, we occupied three oceanographic stations. We collected biological samples with the neuston net at the first station, conducted a vertical meter net tow at a second station, and deployed styrofoam cups at a third oceanographic station to evaluate the effects of water pressure on cup shrinkage (Table 1). Additionally, we continuously sampled water depth and sub-bottom profiles (CHIRP system), oceanographic currents (ADCP), and sea surface temperature, salinity, and chlorophyll in-vivo fluorescence with the seawater flow-through system. Wind speed and direction were also recorded. No CTD, hydrocast, or sediment sampling deployments were made. Data summaries of the neuston tow sample are given in Tables 2 and 3. Voluminous ADCP, CHIRP, and flow-through data are not fully presented here. All unpublished data can be made available by arrangement with the SEA data archivist (contact information, p. 2). The brief summary of C-268A data contained in this report is not intended to represent final data interpretation and should not be excerpted or cited without written permission from SEA. Table 1. C-268A oceanographic sampling stations. X indicates type of station. No associated surface station samples were collected for chemical analyses. Station Date Start Time (local) End Time (local) Latitude (N) Longitude (W) General Locale Neuston Tow Meter Net 1,2 Styrocast 1,3 C268A Aug ' ' 4nm S of Punta de Torrox X C268A Aug ' ' 6nm SE of Punta de la Concepcion C268A Aug ' ' SW of Cartagena 1 Depth in parentheses gives maximum wire out, in meters, during station deployment. X (250m) X (2000m) 2 Station C268A-002-MN comprised a vertical meter net tow, conducted while the ship was hove to. Mostly clear gelatinous organisms were recovered, including siphonophores and small salps. Clear copepods, chaetognaths, and fish larvae were also present. The recovered sample was not quantitatively analyzed, and no 100-count of zooplankton was conducted. 3 Station C268A-003 was a styrocast, during which styrofoam cups were deployed on the hydrowire to a depth of 2000m in order to test the effects of pressure on cup shrinkage. No additional oceanographic data were collected at this station. 6

7 Table 2. C-268A neuston net tow (NT) data. Station location and general locale are given in Table count data of zooplankton sample is given in Table 3, below. Explanatory footnotes are given below. 1,2,3 Station Date Water Temp ( C) Salinity (PSU) Fluor (chl-a ) Moon Phase (%) Risen or Set Cloud Cover (%) Tow Area (m 2 ) 1 Zoopl. Biomass (ml) 1 Zoopl. Density (ml/m 2 ) 1 Phyllosoma Leptocephali Myctophids Cephalopods Other Nekton >2cm Total Nekton Gelatinous Organisms >2cm S. natans (g) 3 S. fluitans (g) 3 Plastic Pellets Plastic Pieces Tar Pieces Halobates C268A-001-NT 11-Aug Set Tow area calculated using distance (meters) between successive minutes' GPS positions while net was deployed. Neuston net opening 1.0m wide by 0.5m tall, with a 333 µm mesh net. Zooplankton density recorded as wet volume displacement of zooplankton biomass per tow area (ml/m 2 ). 2 Micronekton and gelatinous organisms were sorted from net contents using a 1cm mesh sieve, identified, counted, and biovolume determined. The 14 nekton recovered included 12 isopods (7ml biovolume) and 2 small fish (2ml biovolume); no spiny lobster larvae (Phyllosoma), eel larvae (Leptocephali), Lantern fish (Myctophids), or Cephalopods were found. The 1 gelatinous organism recovered was a Velella velella (1ml biovolume). 3 No Sargassum was recovered in the net tow. Floating plastic, tar, and water striders (Halobates) were removed from net contents, sorted, and recorded as numbers collected. Table count data of zooplankton collected in neuston tow C268A-001-NT. Station location and general locale are given in Table 1. Station Copepods Hyperiid Amphipods Megalopae Cladocera Isopods Fish Larvae Fish Eggs Velella velella Total # of Organisms Counted C268A-001-NT