Woods Hole Oceanographic Institution

Cruise Planning Synopsis

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AR30-03: Irminger 5


RV Neil Armstrong

Cruise Party

Amy Bower: Principal Investigator
Organization Name USA
+1 508 289 2781

Alison Macdonald: Chief Scientist
Woods Hole Oceanographic Institution Clark 344A, MS#21 Woods Hole, Ma. USA 02543
+1 508 289 3507

Paul Matthias: Principal Investigator
Organization Name USA
+1 508 289 3672

Departure: Jun 6, 2018


Arrival: Jun 26, 2018


Operations Area

Irminger Sea southeast of Greenland
Lat/Lon: 60° 0.0′ N / 40° 0.0′ W
Depth Range: 0 / 3500
Will the vessel be operating within 200 NM of a foreign country? yes - Greenland
Are visas or special travel documents required? no

Science Objectives

To carry out the recovery and redeployment of the NSF Ocean Observatories Initiative (OOI) Irminger Sea Array, servicing four moorings and up to six gliders in an area southeast of Greenland (38-41W, 58-61N).  The platforms will carry multidisciplinary instrumentation and provide the capability for real time communication of data and control of sampling.  A surface mooring will instrument the sea surface and upper ocean, capturing the surface forcing and upper ocean variability.  A profiling mooring will measure through the water column.  Two additional taut subsurface moorings and the gliders will complete the capabilities to obtain vertical profiles and sample the mesocale (10s to 100 km) variability at the site. Shipboard data will be obtained to assess the performance of the instrumentation. Four days will be devoted to the deployment of 5 (NSF) Overturning of Subpolar North Atlantic (OSNAP) moorings, complete a CTD array along the mooring sites, and the recovery of up to 2 sound sources. The OSNAP moorings monitor the velocity, temperature and salinity of the boundary current between ~37.8-41.1 W, 59.6-59.9N.  The OSNAP moorings include 1 tall mooring with its uppermost instrument at 39 m, and 4 shorter moorings with their uppermost instruments between 1300 and 1600 m. Approximately 30 microcats will be calibrated before deployment by means of 'caldips' (detailed below).  CTD/Rosette casts will be made at all mooring locations to collect temperature, salinity, oxygen, dissolved gas, chlorophyll, particulate organic carbon, and carbonate chemistry profiles. Measurements for these parameters will also be made continuously for surface waters using instrumentation installed on the underway seawater line. Along the OSNAP line CTD/Rosette casts will be made between each mooring location as well.

Science Activities

OOI Science Activities (not necessarily in time order - although deployment will occur before recovery):
  1. For each of the four moorings to be deployed
    1. Validate bathymetry at the deployment site, checking the planned positions and perform an underwater test of the anchor acoustic releases
    2. Deploy the mooring
    3. Perform an anchor survey for the deployed mooring
    4. Perform a CTD/Rosette cast
    5. Perform shipboard measurements and analysis in support of calibration and validation of the deployed sensors (including the gliders)
  2. Recover the 4 moorings deployed in 2017
    1. Note: May need to drag for the 2017 surface mooring as buoy is no longer attached to the mooring
  3. Deploy 5-6 gliders in support of horizontal and vertical sampling in and around the array
    1. Two of the above gliders will be configured with oxygen sensors in a location that enables it to sample the atmosphere for calibration purposes when surfacing between profiles.
  4. Recover one remaining 2016 glider, only recover 2017 gliders should issues arise while the ship is in the area.
OSNAP Science Activities:
1. For the ~30 microcat instruments to be deployed, perform 3 calibration dips:
  1. Place ~10 microcats on the rosette frame struts, lower over the side. 
  2. Take concurrent CTD and microcat measurements, 12 different depths, ranging through the water column, and to 3000 meters depth.  Wait 5 minutes at each bottle stop. 
2. For each of the 5 moorings to be deployed:
    1. Validate bathymetry at the deployment site, checking the planned positions
    2. Perform a CTD/Rosette cast
    3. Deploy the mooring
    4. Perform an anchor survey for the deployed mooring
3. Complete CTD section by performing CTD/Rosette cast between each mooring site.

Additional Info

Pre-cruise Planning Meeting: Visit WHOI
Meeting Notes: Between 1/16-1/26/18


  OOI Irminger Global Surface Mooring (GSM)
  Distance: 560
  Days: 10
  Latitude: 59° 56.7’ N
  Longitude: 39° 34.5’ W

  OSNAP Mooring 1
  Distance: null
  Days: null
  Latitude: 59° 54.18’ N
  Longitude: 41° 6.708’ W

  OSNAP Mooring 2
  Distance: null
  Days: null
  Latitude: 59° 51.546’ N
  Longitude: 40° 41.334’ W

  OSNAP Mooring 3
  Distance: null
  Days: null
  Latitude: 59° 48.888’ N
  Longitude: 40° 16.59’ W

  OSNAP Mooring 4
  Distance: null
  Days: null
  Latitude: 59° 38.796’ N
  Longitude: 38° 33.942’ W

  OSNAP Mooring 5
  Distance: null
  Days: null
  Latitude: 59° 34.626’ N
  Longitude: 37° 47.952’ W

  OSNAP Sound Source 4
  Distance: null
  Days: null
  Latitude: 59° 45.42’ N
  Longitude: 40° 36.24’ W

  OSNAP Sound Source 11
  Distance: null
  Days: null
  Latitude: 61° 40.74’ N
  Longitude: 33° 53.9’ W

Supporting documentation:



Funding Agency: NSF
Grant or contract number: OOI

Scientific Instrumentation for R/V Armstrong

Other Science Vans:

Shipboard Equipment

Bathymetry System 12 kHz
ADCP 300 kHz
Bathymetry System 3.5 kHz
ADCP 150 kHz
Deionized Water System
Science Underway Seawater System
12 kHz Pinger for Wire Use
EM122 (12 kHz) Multibeam Echosounder
EK80 Sonar
Dynamic Positioning System
ADCP 38 kHz
Shipboard Equipment Notes: O2 Titration and salinmeter are OOI supplied.   We will supply our own standards and bottles.
Will need Wet Lab space for this work.

Shipboard Communication

Basic Internet access via HiSeasNet
Shipboard Communication Notes: No special communication needs.

CTD/Water Sampling

Wet Labs C*Star transmissometer (660nm wavelength)
SBE43 oxygen sensor
911+ Rosette 24-position, 10-liter bottle Rosette with dual T/C sensors
Wet Labs FLNTURTD Combination Flourometer and Turbidity Sensor

Critical CTD Sensors

Hydrographic Analysis Equipment

Dissolved Oxygen Titration System (Brinkmann Titrator)

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 3.2 cu. ft. ea.
Storage Notes:


Navigation Notes:


Other Portable Winch
UNOLS Winch Pool
Winch Notes: OOI will bring self-spooling LEBUS winch and OOI will reserve a TSE winch spooler from  from east coast winch pool (Brian Guest).  Winch Power needs: 440V/100 amps

Wire use and application

CTD Winch with .322" Electro-mechanical wire
Trawl Winch with 9/16th trawl wire
Winch Notes: 1) 9/16 trawl as we may have to drag for the 2017 surface mooring; 2) .322 for CTD ops

Our GSM went missing Oct 12, 2017.  We will investigate site and recover what is left under the surface.

Standard Oceanographic Cables

Slip ring required? no
Non-standard wire required? no
Traction winch required? no
Science Van 1
Type/size: OOI Rigging Van Location: Main Deck
Water: n Power:480V/60amp
Science Van 2
Type/size: OOI Storage Container Location: Main Deck
Water: n Power:n
Science Van 3
Type/size: OOI Rag Top Location: Main Deck top outboard side
Water: n Power:n
Science Van 4
Type/size: OOI Flatrack Location: Main Deck top inboard side
Water: n Power:n
Science Van 5
Type/size: CRL Storage Van Location: Bow
Water: no Power:no

Special Requirements

Elecrical Power: yes Identify Winches and Rigging Van; Rigging Van needs 480V/60amp
Equipment Handling: no Identify: 
Inter/intraship Communications: no Identify: 
Science Stowage: yes Identify: samples after collection and some boxes in hold
Water: no Identify: 

Additional Cruise Items/Activities

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

Hazardous Material

Will hazardous material be utilized?yesDescribe deployment method and quantity:
Lithium batteries for gliders. O2 Titrator and Salt chemicals. Small nitrogen tank. Small carbon dioxide tank. (Eric Benway to supply Hazmat inventory).

Radioactive Material


Additional Information

Is night time work anticipated on this cruise?yesSpecialized tech support (Seabeam, coring, other):
Irminger Site survey work and possible CTD. Expect all over the side mooring ops to done in day light. CTD work may be done at night. Calibration dips for the microcat instruments may be done at night.  Glider operations and sound source recovery may occur at night.Other required equipment and special needs:
OOI lost all contact with our Global Surface Mooring (GSM) on Oct 12, 2017.  We believe it has been runover by a vessel and may have broken apart - gone missing.  We will interrogate the subsurface portion of the mooring and recover what is left.  We may have to drag for this mooring if the mooring was dragged or the release doesn't work.

Small boat ops may be required - weather permitting.

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: