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RV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018)

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Neil Armstrong (33VB)
Cruise identifierAR30-04 (F2018-007, OSNAP East 2018)
Cruise period2018-07-01 — 2018-07-29
StatusCompleted
Port of departureReykjavík, Iceland
Port of returnReykjavík, Iceland
PurposeResearch
ObjectivesThis research is part of the US-led project Overturning in the Subpolar North Atlantic Program (OSNAP), an effort to determine the strength of the meridional overturning circulation and associated heat and freshwater fluxes in the subpolar North Atlantic. It is a collaborative program with scientists from several nations, including the UK, Netherlands, Germany, France, Canada and China. Scientists from the US, UK and Netherlands participated in this cruise.

The UK objectives of cruise AR30-04 were to:

1. Recover and redeploy three moorings in the Rockall Trough; deploy three moorings in the Iceland Basin (two replacing US moorings and one new mooring).
2. Conduct standard CTDO2 (Conductivity-Temperature-Depth-Dissolved Oxygen) and Lowered ADCP (Acoustic Doppler Current Profiler) stations at approximately 80 stations along the same mooring line, with water sampling at selected sites for salinity, dissolved oxygen, dissolved inorganic carbon, nutrients (nitrate, silica, phosphate), and nitrogen and silica isotopes.
3. To deploy Argo floats at two locations along the section.
4. To collect invertebrates colonizing mooring hardware for micro-plastics analysis.
Chief scientistWilliam E Johns (Rosenstiel School of Marine and Atmospheric Science)
ProjectUK - Overturning in the Subpolar North Atlantic Programme (UK-OSNAP)
Cruise reportRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018) cruise report neilarmstrong_ar30-04.pdf (4.18 MB) 
NPRCRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018) NPRC neilarmstrong_ar30-04.pdf (0.06 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificIceland Basin, Hatton Bank and west of the Reykjanes Ridge
Track chartsRV Neil Armstrong AR30-04 (F2018-007, OSNAP East 2018) cruise track — neilarmstrong_ar30-04trk.pdf (0.26 MB) 
Measurements 
Physical oceanography 
CTD stationsQuantity: number of stations = 101
Description: CTD/LADCP stations were conducted during the cruise At each station, profiles of temperature, salinity (conductivity), dissolved oxygen concentration, fluorescence, turbidity, and light transmission/attenuation were collected using a Sea-Bird SBE-911plus CTD system.
Transparency (eg transmissometer)Quantity: number of stations = 101
Description: CTD/LADCP stations were conducted during the cruise At each station, profiles of temperature, salinity (conductivity), dissolved oxygen concentration, fluorescence, turbidity, and light transmission/attenuation were collected using a Sea-Bird SBE-911plus CTD system.
Current profiler (eg ADCP)Quantity: number of stations = 101
Description: CTD/LADCP stations were conducted during the cruise At each station, profiles of temperature, salinity (conductivity), dissolved oxygen concentration, fluorescence, turbidity, and light transmission/attenuation were collected using a Sea-Bird SBE-911plus CTD system.
Chemical oceanography 
OxygenQuantity: number of stations = 101
Description: CTD/LADCP stations were conducted during the cruise At each station, profiles of temperature, salinity (conductivity), dissolved oxygen concentration, fluorescence, turbidity, and light transmission/attenuation were collected using a Sea-Bird SBE-911plus CTD system.
OxygenQuantity: number of stations = 101
Description: Water samples from the CTD - Salinity, dissolved oxygen, nutrients (dissolved inorganic carbon, nutrients, and nitrogen and silica isotopes)
Carbon dioxideQuantity: number of stations = 101
Description: Water samples from the CTD - Salinity, dissolved oxygen, nutrients (dissolved inorganic carbon, nutrients, and nitrogen and silica isotopes)
NitrateQuantity: number of stations = 101
Description: Water samples from the CTD - Salinity, dissolved oxygen, nutrients (dissolved inorganic carbon, nutrients, and nitrogen and silica isotopes)
SilicateQuantity: number of stations = 101
Description: Water samples from the CTD - Salinity, dissolved oxygen, nutrients (dissolved inorganic carbon, nutrients, and nitrogen and silica isotopes)
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 101
Description: CTD/LADCP stations were conducted during the cruise At each station, profiles of temperature, salinity (conductivity), dissolved oxygen concentration, fluorescence, turbidity, and light transmission/attenuation were collected using a Sea-Bird SBE-911plus CTD system.
Moorings, landers, buoys 
Physical oceanography 
Current meters57° 28' 9" N  12° 42' 20" W — RTWB1. Depth 1601. Recovered 06/07/2018
Current meters57° 6' 1" N  9° 33' 49" W — RTEB1. Depth 1817. Recovered 07/07/2018
Current meters57° 28' 18" N  12° 18' 40" W — RTWB2. Depth 1801. Recovered 09/07/2018
Current meters57° 48' 3" N  19° 10' 14" W — IB5. Depth 951. Deployed 05/07/2018
Current meters57° 5' 58" N  9° 33' 47" W — RTEB1. Depth 1801. Deployed 08/07/2018
Current meters57° 59' 23" N  21° 8' 46" W — IB4. Depth 2920. Deployed 04/07/2018
Current meters57° 28' 9" N  12° 18' 48" W — RTWB2. Depth 1801. Deployed 09/07/2018
Current meters57° 59' 24" N  24° 21' 11" W — IB3. Depth 2854. Deployed 03/07/2018
Current meters57° 28' 12" N  12° 42' 15" W — RTWB1. Depth 1597. Deployed 06/07/2018
Current profiler (eg ADCP)57° 5' 50" N  9° 20' 6" W — RTADCP1. Depth 750. Deployed 07/07/2018
Current profiler (eg ADCP)57° 48' 3" N  19° 10' 14" W — IB5. Depth 951. Deployed 05/07/2018
Current profiler (eg ADCP)57° 59' 23" N  21° 8' 46" W — IB4. Depth 2920. Deployed 04/07/2018
Other physical oceanographic measurements57° 28' 9" N  12° 18' 48" W — RTWB2. Depth 1801. Deployed 09/07/2018
Other physical oceanographic measurements57° 59' 24" N  24° 21' 11" W — IB3. Depth 2854. Deployed 03/07/2018
Other physical oceanographic measurements57° 28' 12" N  12° 42' 15" W — RTWB1. Depth 1597. Deployed 06/07/2018
Other physical oceanographic measurements57° 48' 3" N  19° 10' 14" W — IB5. Depth 951. Deployed 05/07/2018
Other physical oceanographic measurements57° 5' 58" N  9° 33' 47" W — RTEB1. Depth 1801. Deployed 08/07/2018
Other physical oceanographic measurements57° 28' 18" N  12° 18' 40" W — RTWB2. Depth 1801. Recovered 09/07/2018
Other physical oceanographic measurements57° 28' 9" N  12° 42' 20" W — RTWB1. Depth 1601. Recovered 06/07/2018
Other physical oceanographic measurements57° 5' 50" N  9° 20' 6" W — RTADCP1. Depth 750. Deployed 07/07/2018
Other physical oceanographic measurements57° 6' 1" N  9° 33' 49" W — RTEB1. Depth 1817. Recovered 07/07/2018
Other physical oceanographic measurements57° 59' 23" N  21° 8' 46" W — IB4. Depth 2920. Deployed 04/07/2018