Woods Hole Oceanographic Institution

Cruise Planning Synopsis

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AR38: JP Student Cruise


RV Neil Armstrong

Cruise Party

Mara Freilich: Chief Scientist
Organization Name US
+1 617 452 3989

Glen Gawarkiewicz: Chief Scientist, Principal Investigator
Woods Hole Oceanographic Institution Clark 343C, MS#21 Woods Hole, Ma. USA 02543
+1 508 289 2913

Astrid Pacini: Chief Scientist
Woods Hole Oceanographic Institution Clark 355A, MS#21 Woods Hole, Ma. USA 02543
+1 508 289 2917

Departure: Sep 20, 2019

Woods Hole, MA

Arrival: Sep 22, 2019

Woods Hole, MA

Operations Area

Lat/Lon: 40° 30.0′ N / 70° 49.2′ W
Depth Range: 35 / 3000
Will the vessel be operating within 200 NM of a foreign country? no
Are visas or special travel documents required? no

Science Objectives

The goal will be to teach new Joint Program students at sea sampling techniques. The science objective is to do a transect out to the shelf break south of Martha's Vineyard to characterize the hydrography and the plankton size structure of the southern New England shelf, including the shelf-break front. After the transect, we hope to do some adaptive sampling of a warm core ring or Gulf stream meander by sampling outside the feature (shelf side), at the edge of the feature, and within the feature. Any extra time will be devoted to along shelf sampling.

Science Activities

The science activities will include CTD casts and plankton tows (bongo net) at each of the stations. The plan will be for the CTD to be lowered to 5 m from the bottom. Multiple bottles will be fired at the bottom of the cast, the deep chlorophyll maximum, and the surface for nutrient and chlorophyll samples. Bongo tows will occur after the CTD cast, in which a plankton net with two 60-cm diameter openings will be towed for 5 minutes to 5 m from the bottom or 200 m, whichever is
We plan to look at the shipboard ADCP data between stations (transiting at 10 knots) until we approach the shelf break front, in which we hope to alternate between traveling at 10 knots and 7 knots between stations to look at ADCP data and EK80 data, respectively.

Once offshore, the plan is to look for an oceanographic feature, such as a Gulf Stream meander or warm core ring. We plan to do a CTD cast, bongo tow, and a mesopelagic tow outside, on the edge, and within this feature. The plan for the mesopelagic tow is a single oblique tow to 1000 m with a 10 m^2 net attached to net bars with a rope. It will be functionally similar to a tucker trawl.

Additional Info

Pre-cruise Planning Meeting: Visit WHOI
Meeting Notes: Scheduled for August 29, 1400 in Smith conference room


Supporting documentation:



Funding Agency: TBD
Grant or contract number: TBD

Scientific Instrumentation for R/V Armstrong

Shipboard Equipment

Bathymetry System 12 kHz
ADCP 300 kHz
Sippican XBT System (Mark 21)
Bathymetry System 3.5 kHz
ADCP 150 kHz
Deionized Water System
Science Underway Seawater System
12 kHz Pinger for Wire Use
Fume Hood
EM122 (12 kHz) Multibeam Echosounder
EK80 Sonar
Dynamic Positioning System
Incubation Area
ADCP 38 kHz
EM710 MkII (40 to 100 kHz) Multibeam Echosounder
Shipboard Equipment Notes:

We will also be bringing a plankton net (standard 60 cm bongo) and a 10m^2 net with net bars. It uses a MOCNESS net but is not a MOCNESS. It operates like a tucker trawl in that the net is collapsable.

Shipboard Communication

Basic Internet access via HiSeasNet

CTD/Water Sampling

911+ Rosette 24-position, 10-liter bottle Rosette with dual T/C sensors
Biospherical underwater PAR (1000m depth limit) with reference Surface PAR
SBE43 oxygen sensor
Seapoint STM turbidity sensor
Wet Labs C*Star transmissometer (660nm wavelength)
Wet Labs ECO-AFL fluorometer

Critical CTD Sensors

Hydrographic Analysis Equipment


MET Sensors

Barometric Pressure
Air temperature
Relative Humidity
Wind speed and direction
Short Wave Solar Radiation
Long Wave Solar Radiation

Sample Storage

Freezer -70°C 25 cu. ft.
Storage Notes: We will be freezing small numbers of mesopelagic fish at -70.


Navigation Notes:
Winch Notes:

Wire use and application

CTD Winch with .322" Electro-mechanical wire
Trawl Winch with 9/16th trawl wire
3/8" Hydro Wire
Winch Notes:

We will be towing a bongo net that weighs 150 lbs in air (~100 lbs in water) with the 9/16th trawl wire to 200 m. It will not contain water (filters plankton). We expect 100-200 lbs of tension on the wire. This net can be towed astern.

We will also be towing a 10m^2 tucker trawl net that weighs 300 lbs in air (~200 lbs in water) to 1000 m using the 9/16th trawl wire. It will not contain water (fishing net). We expect 500-1000 lbs of tension on the wire. This net can be towed astern.


Standard Oceanographic Cables

Slip ring required? no
Non-standard wire required? no
Traction winch required? no

Special Requirements

Elecrical Power: no Identify 
Equipment Handling: no Identify: 
Inter/intraship Communications: no Identify: 
Science Stowage: no Identify: 
Water: no Identify: 

Additional Cruise Items/Activities

Explosive Devices:no
Portable Air Compressors:no
Flammable Gases:no
Small Boat Operations:no
SCUBA Diving Operations:no

Hazardous Material

Will hazardous material be utilized?yes
Describe deployment method and quantity:

Radioactive Material


Additional Information

Is night time work anticipated on this cruise?yes
Specialized tech support (Seabeam, coring, other):
Tech support with setting up the EK80 will be needed.
Other required equipment and special needs:

Checklist & Notes


U.S. Customs Form: no
Diplomatic Clearance: no
Date Submitted:
Date Approved:
Agent Information:
Isotope Use Approval: no
Isotope Notes:
SCUBA Diving: no


SSSG Tech: