Woods Hole Oceanographic Institution

Cruise Planning Synopsis

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AT39-05: Hutchins: Colimited N-fixers


R/V Atlantis

Cruise Party

David Hutchins: Chief Scientist, Principal Investigator
3616 Trousdale Parkway P.O. BOX 90089 Los Angeles, CA USA 90089
+1 626 993 4093

Departure: Feb 8, 2018

Praia, Cape Verde

Arrival: Mar 11, 2018

San Juan, Puerto Rico

Operations Area

Latitudinal transect from Cape Verde due south to ~8S, return NW transect to Puerto Rico
Depth Range: 0 / 200
Will the vessel be operating within 200 NM of a foreign country? Cape Verde Islands
Are visas or special travel documents required? no

Science Objectives

We will be using trace metal clean sampling and incubation techniques to investigate iron and phosphorus control of nitrogen fixation in the tropical Atlantic.  Our research plan involves both station work to sample mixed layer profiles (~6-8 depths), collect whole water filtered samples using McClain pumps, net tows to obtain Trichodesmium samples.  Several sets of deckboard incubations will be running concurrently with the transect sampling.  I have uploaded a list of 20 straw-man stations, but we will be looking for Trichodesmium blooms, using both semi-daily net tows and based on ocean color imagery to be periodically sent to the chief scientist. Therefore, stations will necessarily be a bit opportunistic, and may require minor deviations from the cruise track (within reason, of course).

Science Activities

Station sampling will include regular CTD rosette profiles down to ~200m, deployment of a trace metal clean rosette system (coPI Saito), surface seawater trace metal clean pumping system (Saito), McClain pumps (Saito), possibly deployment of an in situ FiRE flurometer (Hutchins), and frequent net tows to collect Trichodesmium samples (Hutchins/Webb).  We also be carrying out simultaneous deckboard incubation work throughout the cruise using 4-5 flow-through deckboard incubators.

Additional Info

Pre-cruise Planning Meeting: Teleconference
Meeting Notes: I can visit WHOI if needed.


Supporting documentation:



Funding Agency: NSF
Grant or contract number: OCE 1657757

Scientific Instrumentation for R/V Atlantis

Other Science Vans:

Shipboard Equipment

Deionized Water System
Science Underway Seawater System
Transducer well for visiting instrumentation
Fume Hood
Navigation - Position

Shipboard Communication

Basic Internet access via HiSeasNet
Is there a need to receive data from shore on a regular basis?

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 ECO-AFL fluorometer
Wet Labs FLNTURTD Combination Flourometer and Turbidity Sensor

Critical CTD Sensors

MET Sensors

Wind speed and direction
Short Wave Solar Radiation

Sample Storage

Freezer -70°C 25 cu. ft.
Freezer -70°C 3.2 cu. ft. ea.
Refrigerator 8.6 cu. ft.
Storage Notes: We will also be storing samples in liquid nitrogen dewars and are very interested in whether the ship's planned new LN generator will be available for our cruise, and whether it has the capacity to fill our dewars in Praia prior to the cruise, or can only supply small amounts to be used for topping off.  If the latter, we'll need to buy LN in Praia, we'd like to avoid that.


Will you be using Long Base Line (LBL) navigation? no
How many nets? null
How many tansponders? null
Will you be using Ultra-short baseline (USBL) navigation?no
Navigation Notes:


CTD Winch with .322" Electro-mechanical wire
Winch Notes:

Wire use and application

CTD Winch with .322" Electro-mechanical wire
Winch Notes: coPI Saito (from WHOI) will deploy his own trace metal rosette system, trace metal surface pumping system, and has requested McClain pumps as well.  Please communicate directly with him about requirements.  Hutchins will bring a collaborating researcher who will occasionally want to do mixed layer profiles with a submersible FiRE flurometer, which will need to be deployed using the winch.

Standard Oceanographic Cables

Slip ring required? no
Non-standard wire required? no
Traction winch required? no
Science Van 1
Type/size: 20ft lab van, PI-owned Location: bay
Water: Power:440/880

Specialized Deck Equipment

Mooring Deployment/Recovery Equipment Required: no Type: 
Cruise Specific Science Winch Required: yes Type:  trace metal clean rosette
Nets Required: yes Type: plankton net tows

Over the Side Equipment

Will you be bringing any equipment (winches, blocks, etc.) that lowers instruments over the side? yes Details: coPI Saito will bring his trace metal clean rosette system.

Special Requirements

Elecrical Power: no Identify 
Equipment Handling: no Identify: 
Inter/intraship Communications: no Identify: 
Science Stowage: yes Identify: supplies and equipment stowage
Water: yes Identify: Flowing seawater to supply 4-5 deckboard incubators

Additional Cruise Items/Activities

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

Hazardous Material

Will hazardous material be utilized?yesDescribe deployment method and quantity:
Hazmats will be confined to lab spaces.  We will provide a detailed list of hazmats next week, we are compiling it now, but it will include HCl, NaOH, acetone, formalin, compressed H2, N2 and acetylene cylinders

Radioactive Material


Additional Information

Is night time work anticipated on this cruise?yesSpecialized tech support (Seabeam, coring, other):
Other required equipment and special needs:

Checklist & Notes


U.S. Customs Form: no
Diplomatic Clearance: no
Date Submitted:
Date Approved:
Agent Information:

The contact persons in Praia who will handle ship’s matter are Mr. Jose Manuel and Mr. Bernardino. The boarding agents are Mr. Marileno and Mr. Telmo.  

We have confirmed the full style address as follows:

Master R/V Atlantis
Attn: David A. Hutchins / AT39-05
Rua Serpa Pinto
P.O. Box No. 58

Phone: +238 2 603101 / 2603103 / 2603106 
Fax : +238 2 612162 

General Manager:  Mr. Euclides Pereira, Mobile +238 9912903
Primary contacts:  Shipping Manager: Mr. José Manuel - Mobile +238 9917641
                                 Operation Manager:  Mr. Bernardino Barbosa - Mobile +238 9916780

Boarding Agent:  Mr. Marileno Soares, Mobile +238 9964277
Boarding Agent:  Mr. Telmo, Mobile +238 5221259

Note: All WHOI contacts should be copied on all communications with Agents.  Information regarding the shipment of any equipment, containers or supplies should be communicated to the Agent and to all WHOI contacts.
Isotope Use Approval: no
Isotope Notes:
SCUBA Diving: no


SSSG Tech: