SOG

Southern Oligotrophic Gyre

Currently comprising a sediment trap mooring with current sensors it is situated in the middle of the least productive gyre in the South Atlantic but in contrast to NOG, an observatory in the North Atlantic oligotrophic gyre, it is not influenced by dust supply.

Infrastructure Location

Study Area

Location Southern Oligotrophic Gyre
Distance from Land 1500 km
Max Depth 5300 m
Oceanographic features of area The southern oligotrophic gyre in the South Atlantic is not influenced by dust supply. This is in contrast to NOG, an observatory in the North Atlantic oligotrophic gyre,
Relevant publications isi journals
Relevant publications proceedings published in the context of conference Pabortsava, K., National Oceanography Centre Southampton, United Kingdom, K.Pabortsava@noc.soton.ac.uk
Lampitt, R. S., National Oceanography Centre Southampton, United Kingdom, r.lampitt@noc.ac.uk
Poulton, A. J., National Oceanography Centre Southampton, United Kingdom, alex.poulton@noc.ac.uk
NOVEL INSIGHTS INTO TEMPORAL VARIATIONS IN CARBON SEQUESTRATION FLUXES IN THE NORTH AND SOUTH ATLANTIC OLIGOTROPHIC GYRES

The oligotrophic gyres occupy >40% of the Earth’s surface; thus, even relatively low carbon exports in these immense ocean provinces may significantly contribute to the global carbon budget. While surface ocean biology is very similar between two Atlantic central gyres, there is an established spatio-temporal variability in their upper ocean biogeochemistry. Presence of such a signature in the deep ocean has long been unknown due to a lack of direct measurements. A unique set of sediment trap samples was collected in the centres of the South and North Atlantic oligotrophic gyres at 3000m depth during 2007-2010. These extraordinary locations are on the annually repeated Atlantic Meridional Transect (AMT) line providing spatial context. Examination of trap material showed large inter-basin differences in downward particle flux and material composition, showing that biogeochemical differences translate into different export and sequestration scenarios, despite the similarity in surface ocean biology. With the predicted expansion of the oligotrophic oceans, such differences in carbon sequestration fluxes introduce a new perspective on the critical role of nutrient-limited waters in global carbon cycle and sinks of atmospheric CO2.

ASLo 2013, Oral presentation

Session #:SS16
Date: 2/21/2013

Scientific Researchers

Name Email
Corinne Pebody <Please login to view>

Status / Maintenance

System Status Operational Planned Frequency 18 month(s)
Platform Required Deep Sea Research Vessel People Involved 6
Duration of Operations 1 day(s) Cleaning Yes
Replacments Yes Download Data Yes

Data Information

Final data output format ASCII Others Data Quality Check Yes
Type of quality check on real-time/near-real time data Manual Real Time – Data availability target
Type of Quality check on delayed mode data Manual Delayed Mode – Data availability target within 1 year of recovery
Own data management Yes Type of use of data Research
Data Management Link
GEOSS URN Resource Id: urn:geoss:csr:resource:urn:uuid:9ced6167-169e-5254-c9ff-6a669d203908
GEOSS Link http://geossregistries.info/geosspub/resource_details_ns.jsp?compId=urn:geoss:csr:resource:urn:uuid:9ced6167-169e-5254-c9ff-6a669d203908

TNA

Avaliable for TNA No
Prefered time period for TNA
TNA Support offered
Services Available
Potential Additional Uses
Data Ports -
Availability of External Power
Instrument installation methodology
Data History
Instrument installation methodology -
Observatory maintenance estimated or planned schedules
Data policy and access
Additional comments
Modality of access

Hardware Services

Type Model Use Problems Solution adopted
acoustic release Rt661 sn: 370

Sensors

Deployed 02/05/2008 Planned 31/03/2014
Instrument/Sensor Type McLane sediment trap Parameter(s) Particle Flux
Platform Mooring Manufacturer McLane
Instrument/Sensor documentation (URL)
Sensor Type / Model Sediment trap Power Supply battery
Approximate Depth / Height 3000 Sampling interval 28 second(s)
Calibration Samples Available Yes Frequency of Calibration Samples
Intercalibration Available No Intercalibration Platform
Intercalibration Frequency
Problems
Solution Adopted
Datasheet URL
Comments

Deployed 02/05/2008 Planned 31/03/2014
Instrument/Sensor Type current mater Parameter(s) Currents
Platform Mooring Manufacturer Aanderaa
Instrument/Sensor documentation (URL)
Sensor Type / Model rcm8 Power Supply battery
Approximate Depth / Height 3000 Sampling interval 30 second(s)
Calibration Samples Available Yes Frequency of Calibration Samples
Intercalibration Available No Intercalibration Platform
Intercalibration Frequency
Problems
Solution Adopted
Datasheet URL
Comments

Deployed 12/02/2014 Planned 31/03/2014
Instrument/Sensor Type microcat Parameter(s) CTD
Platform Mooring Manufacturer seabird
Instrument/Sensor documentation (URL)
Sensor Type / Model sbe Power Supply battery
Approximate Depth / Height 100 Sampling interval 30 second(s)
Calibration Samples Available Yes Frequency of Calibration Samples
Intercalibration Available Yes Intercalibration Platform
Intercalibration Frequency
Problems
Solution Adopted
Datasheet URL
Comments