miami ohio winter term cruise report cruise c-270c · 2017-10-05 · 5 introduction this cruise...

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Miami Ohio Winter Term Cruise Report Cruise C-270C

Scientific Data Collected Aboard SSV Corwith Cramer

San Juan, Puerto Rico – San Juan, Puerto Rico

January 10 – 20, 2017

Sea Education Association

Woods Hole, Massachusetts

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Cover photo caption:

SEA Miami Ohio Cruise C-270C participants, on SSV Corwith Cramer, dockside in San Juan, Puerto Rico.

This document should be cited as:

Meyer, A.W. 2017. Final report for S.E.A. Cruise C-270C. Sea Education Association, Woods Hole, MA 02543. www.sea.edu.

To obtain unpublished data, contact the Chief Scientist or SEA data archivist:

Data Archivist Sea Education Association PO Box 6 Woods Hole, MA 02543 Phone: 508-540-3954 Fax: 508-457-4673 E-mail: [email protected] Web: www.sea.edu

http://www.sea.edu/

mailto:[email protected]

http://www.sea.edu/

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Table of Contents

Ship’s Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Data Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 1. C-270C Hourly Positions. . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 1. Oceanographic Sampling Stations . . . . . . . . . . . . . . . . . . . . 7

Table 2. Surface Sampling Station Data . . . . . . . . . . . . . . . . . . . . . . 8

Figure 2. Surface Temperature and Salinity. . . . . . . . . . . . . . . . . . . . 9

Figure 3. Surface Chlorophyll Fluorescence . . . . . . . . . . . . . . . . . . . 10

Figure 4. Surface Wind Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 3. Hydrocast Bottle Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 5. CTD/Hydrocast Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4. Neuston Net Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 5. Meter Net Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 6. Phytoplankton Net Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 7. Secchi Disk Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 8. Shipek Grab Sediment Data . . . . . . . . . . . . . . . . . . . . . . . . . 17

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C-270C Ship’s Company, SSV Corwith Cramer Nautical Faculty and Staff

Sarah Herard Captain/Nautical Science Faculty Sara Martin Chief Mate Ryan Loftus Second Mate Lydia Mathewson Third Mate Alex Myers Engineer David Dandridge Assistant Engineer Becky Slattery Steward Ger Tysk Assistant Steward Elizabeth Foretek Rigger Grayson Huston Sailing Intern Grace Ballou Sailing Intern Kathryn Lindsey Sailing Intern Scientific Faculty and Staff

Audrey Meyer Chief Scientist/Oceanography Faculty Kelsey Lane First Assistant Scientist Farley Miller Second Assistant Scientist Marissa Shaw Third Assistant Scientist Rachael Morgan-Kiss Miami Ohio University Faculty Shasten Sherwell Miami Ohio Teaching Assistant Students and Other Participants

Martha Carter Miami Ohio University John Thatcher Creber Miami Ohio University Rachel Frankhouser Miami Ohio University Jack Haught Miami Ohio University Sarah Hiner Miami Ohio University Trevor Holm Miami Ohio University Ben Keller Miami Ohio University Alex Lanoue Miami Ohio University Brittany Nordhaus Miami Ohio University Claire Papamarcos Miami Ohio University Koby Schneider Miami Ohio University Joshua Trimboli Miami Ohio University Keiko Wilkins Miami Ohio University Valerie Falconieri SEA Admissions Counselor

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Introduction This cruise report provides a summary of scientific activities aboard the SSV Corwith Cramer during Cruise C-270C (January 10-20, 2017). This was the sea component portion of a winter term program offered by Miami Ohio University in collaboration with SEA. Departing from and returning to San Juan, the ~620nm cruise track circumnavigated Puerto Rico in a counterclockwise direction and included a short stop at Sun Bay, Vieques for a pleasant afternoon’s respite there. Scientific sampling was conducted throughout the cruise, in Atlantic Ocean and Caribbean Sea waters.

The students completed two Miami Ohio University courses during their winter term program: SEA Miami I – Ocean Sciences (MBI 350), and SEA Miami II – Nautical Training (MBI 399). While onboard the ship, the students served as full, working members of the scientific team and sailing crew, deploying oceanographic sampling equipment, learning to operate the vessel, and collecting data for their scientific research projects. They presented preliminary summaries of their research results at the end of the cruise, and they will complete their projects after they return to the Miami Ohio campus. Final results will be presented at a campus-wide undergraduate research forum in late April. Miami Ohio Professor Rachael Morgan-Kiss collected samples to use in a microbial ecology class she is teaching this spring semester, and also ran these samples through a BBE FluoroProbe III she had brought aboard to distinguish spatial variations and depth profiles of different microalgae communities. C-270C was a great cruise, with mostly cooperative weather, interesting science, and a super group of students. Thanks to all my 31 shipmates for such a wonderful voyage. A special thanks to my faculty colleagues, SEA Captain Sarah Herard and Miami Ohio professor Rachael Morgan-Kiss, and the other 11 members of SEA’s professional crew, who did an excellent job and made everything run so smoothly. It was a true pleasure sailing with you in delightfully warm weather, far away from chilly Ohio and Massachusetts! The brief summary of C-270C 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. Audrey W. Meyer Chief Scientist, C-270C

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Data Description

This section provides a record of data collected aboard the SSV Corwith Cramer Cruise C-270C, which departed from and returned to San Juan, Puerto Rico, with a brief stop at Vieques Island (Figure 1).

During the 11-day cruise, we collected oceanographic samples and deployed scientific gear at 16 discrete stations (Table 1). Chemical analyses were made of 23 surface water samples, the majority of which occurred coincident with hydrocast and biological sampling (neuston net, meter net and phytoplankton net) stations (Table 2). Additionally, we continuously sampled water depth and sub-bottom profiles (CHIRP system), and sea surface temperature and salinity (Figure 2), in-vivo chlorophyll fluorescence (Figure 3), colored dissolved organic matter (CDOM) fluorescence, and transmissivity. Wind speed and direction were recorded throughout the cruise with an anemometer located at the top of the foremast (Figure 4). CTD measurements of vertical temperature, salinity, and density profiles were collected at six stations (Figure 5), five of which were hydrocasts with Niskin bottles for water sampling at depth (Table 3). Additional instrumentation on the hydrocast stations allowed profiling of dissolved oxygen, chlorophyll fluorescence (Figure 5), transmissivity, and photosynthetically active radiation (PAR). Summaries of sea surface and water column physical, chemical and biological properties are given in Tables 3-7. Results of sediment analyses of a shipek grab sample are given in Table 8. Voluminous CTD, 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).

Figure 1. Hourly positions along the C-270C cruise track.

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Table 1. C-270C oceanographic sampling stations. X indicates type of station. (NT = Neuston Tow, MN = Meter Net, PN = Phytoplankton Net, HC = Hydrocast with 12 Niskin bottles, CTD and optical instrumentation, CTD = Free CTD, SD = Secchi Disk, SG = Shipek Grab, SS = Surface Station.) See footnote at bottom of table.1

Station DateTime

(Local)

Latitude

(N)

Longitude

(W)General Locale NT MN 1 PN HC 1 CTD 1 SD 1 SG 1

Associated

Surface

Station

C270C-001 11-Jan-17 0918 18° 27.1' 66° 06.4' San Juan Harbor X SS-001

C270C-002 11-Jan-17 1623 18° 32.1' 66° 15.2'Atlantic Ocean,

North of Puerto RicoX SS-002

C270C-003 12-Jan-17 1036 17° 52.8' 67° 24.8' Mono Passage X XX

(600m)

X

(28m)SS-004

C270C-004 12-Jan-17 2327 17° 45.4' 66° 54.8' South of Puerto Rico X SS-005

C270C-005 13-Jan-17 1008 17° 40.3' 66° 16.1' South of Puerto Rico X XX

(625m)

X

(34m)SS-006

C270C-006 13-Jan-17 2115 17° 39.4' 66° 16.7' South of Puerto Rico XX

(400m)SS-007

C270C-007 14-Jan-17 0948 17° 42.9' 66° 04.7' South of Puerto Rico X XX

(626m)

X

(29m)SS-008

C270C-008 15-Jan-17 2346 17° 56.5' 65° 49.8' South of Puerto Rico X SS-009

C270C-009 15-Jan-17 1000 17° 49.3' 65° 29.7' South of Vieques X XX

(625m)

X

(29m)SS-010

C270C-010 15-Jan-17 2106 17° 56.6' 65° 29.1' South of Vieques XX

(400m)SS-011

C270C-011 15-Jan-17 1005 18° 00.1' 65° 26.3' South of Vieques X XX

(625m)

X

(27m)SS-012

C270C-012 16-Jan-17 2233 17° 49.9' 65° 17.0' South of Vieques X SS-013

C270C-013 17-Jan-17 0835 18° 04.6' 65° 25.1' South of Vieques XX

(22m)

X

(28m)SS-014

C270C-014 17-Jan-17 1340 18° 05.4' 65° 27.6' Sun Bay, Vieques X SS-015


North of Puerto RicoX SS-016


Puerto Rico TrenchX

X (1300m)

SS-017

1 Depths given in parentheses for MN, HC, CTD, SD, and SG deployments are maximum wire-out values. This is usually greater than actual cast depth

due to current-induced wireline angle.

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Table 2. C-270C surface sampling station (SS) data. Associated oceanographic sampling stations are given in Table 1. See footnote at bottom of table.1

Surface

StationDate

Time

(Local)

Latitude

(N)

Longitude

(W)General Locale

Temp 1

(°C)

Salinity 1

(PSU)

Chl-a

Fluor 1

(volts)

CDOM

Fluor 1

(volts)

Transmissivity 1

(volts)

Chl-a 1

(µg/l)

PO4 1

(µM)

SS-001 11-Jan-17 0959 18° 27.1' 66° 06.4' San Juan Harbor 27.2 32.400 1065.1 190.9 14007.1 5.324 0.619

SS-002 11-Jan-17 1633 18° 31.8' 66° 15.2' Atlantic Ocean,

North of Puerto Rico27.4 35.370 450.1 91.9 14960.1 0.196 0.059



SS-004 12-Jan-17 1130 17° 52.0' 67° 30.1' Mono Passage 27.4 35.480 454.6 95.5 14696.3 0.208 0.064

SS-005 12-Jan-17 2338 17° 44.9' 66° 54.5' South of Puerto Rico 27.4 35.380 495.1 95.7 15034.6 0.151 0.045





SS-010 15-Jan-17 1100 17° 48.7' 65° 30.1' South of Vieques 26.8 35.316 443.6 93.7 15027.5 0.099 0.021





SS-015 17-Jan-17 1055 18° 05.4' 65° 27.6' Sun Bay, Vieques 26.2 35.330 478.3 110.6 14713.8 0.186 0.031




Puerto Rico Trench26.4 35.681 527.0 97.4 14465.6 0.103 0.445

SS-018 19-Jan-17 1109 18° 31.3' 66° 04.8' 5nm outside San

Juan Harbor26.8 36.112 664.2 102.6 13984.5 0.408 0.428


Juan Harbor26.7 36.149 704.2 105.8 13806.3 0.557 0.570


Juan Harbor26.7 36.139 713.3 107.7 13611.5 0.529 0.279


Juan Harbor26.2 35.001 957.6 175.9 12855.7 1.108 0.960


Juan Harbor26.4 35.694 887.4 151.0 11959.6 0.739 0.827

SS-023 19-Jan-17 1154 18° 28.4' 66° 07.7' San Juan Harbor

Entrance26.2 34.984 1050.4 203.0 11330.4 1.519 0.819

1 Water temperature, salinity, relative chlorophyll fluorescence, colored dissolved organic matter (CDOM) fluorescence, and transmissitivity were

determined from samples collected in lab by flow-through seawater system. Extracted chlorophyll-a and phosphate determined from surface water

samples collected using a bucket, deployed over the side of the ship.

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Figure 2. Hourly surface temperature (top figure) and surface salinity (bottom figure) measurements from the continuous flow-through SeaBird Thermosalinography (S/N 0022) data logger collected during Cruise C-270C.

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Figure 3. Hourly sea surface relative chlorophyll in-vivo fluorescence (volts) from the continuous flow-through system collected during Cruise C-270C. Extracted chlorophyll-a data from discrete surface station samples SS-001 through SS-023 are given in Table 2.

Figure 4. Hourly surface wind speed (knots) throughout Cruise C-270C.

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Table 3. C-270C hydrocast (HC) bottle data. Station locations and general locales are given in Table 1. Oceanographic data from associated surface stations are given in Table 2. Analyses conducted as given in footnote at bottom of table on following page.1

StationBottle

#

Depth

(m)

Temp

(°C)

Salinity

(PSU)

Density

(sigma-t,

kg/m3)

O2

(µmol/kg)

PO4

(µM)

Chl-a

(µg/l)

Chl.

Fluor.

(volts)

Assoc.

Surface

Station

12 20.2 27.34 35.432 22.94 173.241 0.021 0.160 0.044

11 39.5 27.44 35.606 23.04 179.907 0.036 0.016 0.050

10 59.1 27.43 36.678 23.85 182.476 0.153 0.478 0.297

9 78.9 26.21 36.817 24.34 178.363 0.120 0.257 0.106

8 99.0 25.61 37.081 24.73 173.945 0.167 0.168 0.074

7 124.3 24.77 37.216 25.10 170.000 0.125 0.040 0.027

6 149.7 23.56 37.266 25.50 170.293 0.130 0.000 0.011

5 198.3 21.21 37.027 25.99 156.399 0.252 0.000 0.008

4 298.0 17.63 36.491 26.52 161.921 0.483 0.000 0.007

3 396.5 15.06 35.998 26.74 139.365 0.794 0.000 0.008

2 496.2 12.88 35.641 26.93 128.319 1.123 0.000 0.012

1 539.9 12.17 35.529 26.98 126.602 1.344 0.000 0.014

12 20.4 27.14 35.184 22.81 190.183 0.031 0.146 0.041

11 40.2 27.14 35.184 22.81 191.624 0.021 0.146 0.047

10 60.5 27.13 35.185 22.81 191.306 0.031 0.174 0.052

9 79.7 26.71 36.986 24.31 177.232 0.186 0.421 0.211

8 100.1 25.82 37.105 24.68 181.730 0.158 0.245 0.069

7 124.4 24.76 37.286 25.14 178.103 0.106 0.038 0.023

6 149.6 23.47 37.242 25.50 170.615 0.153 0.005 0.014

5 199.0 20.91 36.983 26.03 154.420 0.200 0.000 0.007

4 298.2 17.53 36.470 26.51 154.092 0.445 0.000 0.006

3 397.5 15.08 36.060 26.77 151.758 0.718 0.000 0.007

2 496.3 12.52 35.629 26.98 130.241 1.180 0.000 0.009

1 557.6 10.46 35.250 27.07 119.331 1.448 0.000 0.013

12 19.5 26.93 35.154 22.86 191.821 0.050 0.133 0.050

11 40.2 26.93 35.156 22.86 191.293 0.036 0.133 0.058

10 61.2 26.92 35.155 22.87 192.249 0.026 0.133 0.043

9 79.3 26.69 37.049 24.37 186.335 0.021 0.436 0.194

8 99.9 25.51 37.189 24.84 178.846 0.064 0.172 0.070

7 123.9 24.72 37.336 25.20 177.162 0.040 0.020 0.020

6 149.1 23.66 37.288 25.49 172.769 0.036 0.008 0.014

5 198.3 21.24 37.042 26.00 161.671 0.087 0.000 0.008

4 298.0 17.40 36.431 26.53 153.898 0.426 0.000 0.007

3 396.9 14.66 35.972 26.81 145.590 0.775 0.000 0.007

2 496.7 12.16 35.536 26.99 126.655 0.897 0.000 0.011

1 524.7 11.49 35.414 27.02 122.712 1.203 0.000 0.014

SS-004

SS-006

SS-008

C270C-003-HC

C270C-005-HC

C270C-007-HC

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Table 3, continued. C-270C hydrocast (HC) bottle data.

StationBottle

#

Depth

(m)

Temp

(°C)

Salinity

(PSU)

Density

(sigma-t,

kg/m3)

O2

(µmol/kg)

PO4

(µM)

Chl-a

(µg/l)

Chl.

Fluor.

(volts)

Assoc.

Surface

Station

12 20.2 26.68 35.278 23.03 143.221 0.000 0.086 0.037

11 39.7 26.80 35.345 23.05 165.157 0.000 0.106 0.044

10 59.6 27.20 36.849 24.05 178.820 0.012 0.322 0.083

9 80.3 25.97 36.916 24.50 150.180 0.026 0.214 0.121

8 99.9 24.99 37.114 24.95 147.180 0.026 0.042 0.031

7 125.9 24.03 37.186 25.30 155.781 0.059 0.004 0.014

6 149.6 23.25 37.222 25.56 164.505 0.073 0.000 0.011

5 199.5 20.76 36.989 26.09 136.034 0.149 0.000 0.006

4 298.3 17.04 36.341 26.55 141.464 0.506 0.000 0.006

3 396.8 15.01 36.028 26.78 140.583 0.751 0.000 0.006

2 496.7 11.83 35.435 26.97 121.500 1.203 0.000 0.009

1 542.9 10.74 35.258 27.04 117.376 1.547 0.000 0.012

12 20.0 26.80 35.397 23.08 191.976 0.017 0.111 0.115

11 40.0 26.83 35.409 23.08 192.223 0.000 0.097 0.139

10 60.0 26.90 35.546 23.17 192.314 0.000 0.163 0.210

9 80.0 26.68 36.937 24.29 186.399 0.000 0.313 0.532

8 100.0 25.99 37.070 24.61 182.124 0.000 0.149 0.363

7 124.7 24.26 37.274 25.29 178.120 0.000 0.020 0.020

6 149.8 22.42 37.169 25.76 169.982 0.026 0.000 0.019

5 199.1 20.52 36.940 26.11 167.916 0.040 0.000 0.008

4 298.4 17.47 36.465 26.54 162.179 0.309 0.000 0.006

3 398.4 15.10 36.054 26.78 148.066 0.563 0.000 0.007

2 496.7 12.53 35.621 26.98 131.627 1.015 0.000 0.010

1 538.6 11.12 35.363 27.05 121.739 1.439 0.000 0.012

1 Temperature, salinity, and density data were determined from a SeaBird 19Plus V2 CTD. Dissolved oxygen

and chlorophyll fluorescence were determined with a SeaBird SBE-43 oxygen sensor and Sea Point in-vivo

chlorophyll fluorometer, respectively, both deployed with the hydrocast carousel. Extracted chlorophyll- a

samples were fi ltered through 0.45 µm filters and measured with a Turner Designs Model 10-AU fluorometer.

Phosphate (PO4) was assessed with colorometric spectrophotometry. Additional water samples from each

bottle were analyzed with a BBE FluoroProbe III to distinguish depth profiles of different microalgae

communities, and were also fi ltered for subsequent microbiological analyses at Miami Ohio University.

SS-010

SS-012

C270C-009-HC

C270C-011-HC

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Figure 5. Temperature, salinity, and chlorophyll fluorescence profiles for Stations C270C-003-HC, C270C-005-HC, C270C-007-HC, and C270C-009-HC. Associated profiles of dissolved oxygen, PAR, and transmissivity are not shown. Station locations given in Table 1. Data from water samples collected at depth during HC deployments are given in Table 3. Digital data are available from SEA upon request.

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Figure 5, continued. Temperature, salinity, and chlorophyll fluorescence profiles for Station C270C-011-HC (left), and temperature and salinity profiles for Station C270C-016-CTD (right). Note differences in vertical scales. Associated profiles of dissolved oxygen, PAR, and transmissivity for Station C270C-011-HC are not shown. Station locations given in Table 1. Data from water samples collected at depth during C270C-011-HC are given in Table 3. Digital data are available from SEA upon request.

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Table 4. C-270C neuston net tow (NT) data. Station locations and general locales are given in Table 1. Oceanographic data from associated surface stations are given in Table 2. 100-count data of zooplankton samples and details of nekton and gelatinous organisms recovered are available from SEA. Explanatory footnotes are given below.1,2

StationTime

(Local)

Moon

Phase

(%)

Risen

or Set

Cloud

Cover

(%)

Tow

Area 1

(m2)

Zoopl.

Biomass 1

(ml)

Zoopl.

Density 1

(ml/m2)

Phyllo-

soma

(#)

Lepto-

cephali

(#)

Mycto-

phids

(#)

Cepha-

lopods

(#)

Other

Nekton

>2cm (#)

Total

Nekton

(#)

Total

Nekton

(ml)

S.

natans

(g)

S.

fluitans

(g)

Plastic

Pellets

(#)

Plastic

Pieces

(#)

Tar

Pieces

(#)

Halo-

bates

(#)

Gelatinous

Organisms

>2cm (#)

Gelatinous

Organisms

>2cm (ml)

Assoc.

Surface

Station

C270C-002-NT 1623 99% set 89% 1369.3 4.3 0.0031 0 0 0 0 0 0 0.0 0.0 0.0 0 0 0 0 0 0.0 SS-002

C270C-003-NT 1228 100% set 20% 1455.9 2.0 0.0014 0 0 0 0 3 3 0.5 6.0 0.0 0 0 0 0 0 0.0 SS-004

C270C-004-NT 2327 100% risen 10% 1363.5 21.0 0.0154 0 0 2 0 6 8 9.1 645.0 165.0 0 6 0 0 0 0.0 SS-005

C270C-005-NT 1148 99% set 20% 2002.0 3.1 0.0015 0 0 0 0 1 1 0.2 18.0 3.0 0 1 0 0 0 0.0 SS-006

C270C-006-NT 2229 99% risen 40% 1881.3 6.0 0.0032 0 0 0 0 2 2 1.0 32.0 5.0 0 0 0 0 0 0.0 SS-007

C270C-007-NT 1115 95% set 20% 2381.9 6.0 0.0025 0 0 0 0 1 1 1.0 2.0 30.0 0 10 0 0 0 0.0 SS-008

C270C-008-NT 2346 95% risen 85% 1694.4 2.6 0.0015 0 0 0 0 1 1 0.0 0.0 0.0 0 0 0 0 0 0.0 SS-009

C270C-009-NT 1142 89% set 40% 1827.9 4.5 0.0025 0 0 0 0 0 0 0.0 15.0 0.0 1 0 0 0 0 0.0 SS-010

C270C-010-NT 2209 89% risen 66% 1924.3 11.0 0.0057 0 0 2 0 2 4 0.4 22.0 0.0 1 0 0 0 1 0.3 SS-011

C270C-011-NT 1138 81% set 10% 1952.5 4.5 0.0023 0 0 0 0 0 0 0.0 0.0 5.0 0 2 0 0 0 0.0 SS-012

C270C-012-NT 2233 81% risen 60% 2203.6 14.0 0.0064 0 1 2 0 0 3 0.6 0.5 0.0 0 1 0 1 6 2.6 SS-013

C270C-015-NT 1724 64% set 15% 1512.3 5.5 0.0036 0 0 0 0 2 2 0.5 5.0 6.0 0 2 0 1 0 0.0 SS-016

C270C-016-NT 0016 64% risen 17% 1521.0 19.0 0.0125 5 30 1 0 0 36 29.7 7.0 2.0 0 2 0 5 0 0.0 SS-017

1 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/m2).

2 Spiny lobster larvae (Phyllosoma), eel larvae (Leptocephali), Lantern fish (Myctophids), and Cephalopods sorted from net contents and counted. Other micronekton and gelatinous micronekton removed using a 1cm mesh

sieve and identified; biovolume (ml) recorded. Sargassum species (S. natans and S. fluitans ) removed from net contents and weighed with spring balance scale. Floating plastic, tar, and water striders (Halobates) removed from

net contents, sorted, and recorded as numbers collected per tow.

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Table 5. C-270C meter net (MN) data. Station locations are given in Table 1. Oceanographic data from associated surface stations are given in Table 2. Explanatory footnotes are given below. 1,2

Station DateTime

(Local)

Tow

Depth

(m)

Tow

Volume

(m3) 1

Zoopl.

Biomass

(ml) 1

Zoopl.

Density

(ml/m3) 1

Phyllo-

soma

(#) 2

Lepto-

cephali

(#) 2

Mycto-

phids

(#) 2

Cepha-

lopods

(#) 2

Other

Nekton

>2cm (#) 2

Total

Nekton

(#) 2

Total

Nekton

(ml)

Assoc.

Surface

Station

C270C-006-MN 13-Jan-17 2115 285.3 1233.2 26.0 0.0211 0 0 0 0 9 9 1.5 SS-007

C270C-010-MN 15-Jan-17 2106 140.3 2035.1 67.0 0.0329 0 1 0 0 2 3 0.4 SS-011

1 Meter net has 333µm mesh. Tow volume (m3) calculated from flowmeter measurements. Zooplankton density recorded as wet volume displacement

of zooplankton biomass per tow volume (ml/m3).

2 Spiny lobster larvae (Phyllosoma), eel larvae (Leptocephali), Lantern fish (Myctophids), Cephalopods, and other nekton >2cm (mostly shrimp) were

sorted from net contents and counted. No Sargassum , plastic pellets or pieces, tar, water striders (Halobates) or gelatinous organisms >2cm were

recovered in either of the meter net tows.

Table 6. C-270C phytoplankton net (PN) data. Station locations are given in Table 1. Oceanographic data from associated surface stations are given in Table 2. Explanatory footnotes are given below. 1,2

Station DateTime

(Local)General Locale

Water

Temp (°C) 1Salinity

(PSU) 1Chl. Fluorescence

(volts) 1Sample Type

Diatoms

(%) 2Dinoflagellates

(%) 2Assoc. Surface

Sample

C270C-001-PN 11-Jan-17 0918 San Juan Harbor 27.2 32.40 1065.1 Drifted Surface 95 5 SS-001

C270C-003-PN 12-Jan-17 1120 Mono Passage 27.4 35.48 454.6 Drifted Surface 80 20 SS-004

C270C-005-PN 13-Jan-17 1038 S. of Puerto Rico 27.3 35.23 454.8 Drifted Surface 72 28 SS-006

C270C-007-PN 14-Jan-17 1017 S. of Puerto Rico 27.0 35.20 436.9 Drifted Surface 69 31 SS-008

C270C-009-PN 15-Jan-17 1033 South of Vieques 26.8 35.32 442.3 Drifted Surface 82 18 SS-010



C270C-014-PN 17-Jan-17 1340 Sun Bay, Vieques 26.2 35.33 478.3 Drifted Surface 98 2 SS-015

1 Except for Station C270C-001-PN, sea surface temperature, salinity, and chlorophyll fluorescence measurements from water samples collected in flow-

through system while drifted surface plankton net was deployed. For C270C-001-PN, water temperature and salinity were determined using a YSI at site of

phytoplankton net deployment, while chlorophyll fluorescence was recorded after flow-through system was started up immediately outside of San Juan Harbor.

2 Diatom and dinoflagellate percentages based on 100 counts, except for C270C-001-PN for which percentages were based on counting of 805 organisms.

17

Table 7. C-270C secchi disk (SD) data. Station locations and general locales are given in Table 1. Oceanographic data from associated surface stations are given in Table 2.

Station DateTime

(Local)

Cloud

Cover (%)

Wave

Height (ft)

Wind Speed

(BF) 1Secchi Depth

(m)

Calculated

Depth of 1%

Light Level (m)

Associated

Surface

Station

C270C-003-SD 12-Jan-17 1036 15 8 5 27.5 74 SS-004

C270C-005-SD 13-Jan-17 1008 10 5 4 32.5 87 SS-006

C270C-007-SD 14-Jan-17 0948 45 8 5 29 77 SS-008

C270C-009-SD 15-Jan-17 1000 40 7 5 29 78 SS-010

C270C-011-SD 16-Jan-17 1005 70 6 4 27 71 SS-012

C270C-013-SD 17-Jan-17 0845 40 1 2 22 59 SS-014

1 BF = Beaufort Force.

Table 8. C-270C shipek grab (SG) sediment data. Station location is given in Table 1. Oceanographic data from associated surface station are given in Table 2.

> 4m

m

3-4

mm

2-3

mm

1-2

mm

0.5-

1 m

m

0.25

-0.5

mm

0.12

5-0.

25 m

m

0.06

3-0.

125

mm

< 0.

063

mm

C270C-013-SG 18-Jan-17 0855 27

South of

Vieques,

near Sun

Bay

1 1 1 3 22 23 12 1 36

Calcareous silty, medium to coarse

sand. Dusky yellowish brown (10YR

2/2) color. Sand mostly subangular

to subrounded, moderately sorted

shell and coral fragments. Grab

also recovered seaweed fragments.

SS-014

Qualitative Description

Assoc.

Surface

Station

Station DateTime

(Local)

Water

Depth

(m)

General

Locale

Sediment Size Analysis (%)

miami ohio winter term cruise report cruise c-270c · 2017-10-05 · 5 introduction this cruise...

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