Past, current and envisioned activities in the Labrador Sea

Slides:

Advertisements

Similar presentations

Open-ocean sustained time series observation sites run/co-run by NOAA/AOML Western Boundary Time Series: Florida Current transport (Meinen & Baringer)

Advertisements

Global climate responses to perturbations in Antarctic Intermediate Water Jennifer Graham Prof K. Heywood, Prof. D. Stevens, Dr Z. Wang (BAS)

1 ICES/NAFO Symposium Santander May Seasonal to interannual variability of temperature and salinity in the Nordic Seas: heat and freshwater budgets.

Water mass transformation in the Iceland Sea Irminger Sea, R/V Knorr, October 2008 Kjetil Våge Kent Moore Steingrímur Jónsson Héðinn Valdimarsson.

Slide 1 Predicting the Climate of Europe: the THOR project Laurent Mortier – University of Paris for Detlef Quadfasel (co-ordinator), University of Hamburg.

Observed variability of hydrography and transport at 53°N in the Labrador Sea Johannes Karstensen GEOMAR Helmholtz Centre for Ocean Research Kiel With.

Propagation of wave signals along the western boundary and their link to ocean overturning in the North Atlantic Vassil Roussenov 1, Ric Williams 1 Chris.

Baroclinic Instability in the Denmark Strait Overflow and how it applies the material learned in this GFD course Emily Harrison James Mueller December.

Propagation of wave signals in models and altimetry for the North Atlantic Vassil Roussenov 1, Chris Hughes 2, Ric Williams 1, David Marshall 3 and Mike.

Rapid Climate Change (RAPID) programme Meric Srokosz Southampton Oceanography Centre Natural Environment Research Council (NERC)

BNL INL Lateral Transport of Dissolved and Particulate TEIs at Ocean Margins K2-NW Pacific % Transmission Along Line W 228 Ra.

Potential temperature ( o C, Levitus 1994) Surface Global zonal mean.

Andrew Budnick October 7 th, 2011 North Atlantic oxygen: Summary and results Andrew Budnick Undergraduate, Princeton University.

Thermohaline Overtuning – at Risk? Detlef Quadfasel, THOR Project Office KlimaCampus, University of Hamburg, Germany

Measurements in the Ocean Peter Challenor University of Exeter and National Oceanography Centre.

THOR-CT3 Summary 26 September 2012

Revised circulation scheme north of the Denmark Strait

Radiatively Active Gases from the N. Atlantic Region and Climate Change (RAGNARoCC) Andy Watson, UEA Biogeochemical sections for carbon and CFCs in the.

Evaporative heat flux (Q e ) 51% of the heat input into the ocean is used for evaporation. Evaporation starts when the air over the ocean is unsaturated.

Two research cruises were successfully conducted in 2013 and Shipboard and moored observations show that: at first glance no significant decadal.

The North Atlantic Ocean and Climate Observing System Stuart A. Cunningham Scottish Association for Marine Science Barbara.

Model LSW formation rate (2 yr averages) estimated from: (red) CFC-12 inventories, (black) mixed layer depth and (green) volume transport residual. Also.

The role of gliders in sustained observations of the ocean Deliverable 4.1 or WP 4.

Western boundary circulation in the tropical South Atlantic and its relation to Tropical Atlantic Variability Rebecca Hummels 1, Peter Brandt 1, Marcus.

Inter-annual to decadal climate prediction Mojib Latif, Leibniz Institute of Marine Sciences at Kiel University.

Ventilation of the Equatorial Atlantic P. Brandt, R. J. Greatbatch, M. Claus, S.-H. Didwischus, J. Hahn GEOMAR Helmholtz Centre for Ocean Research Kiel.

Indirect estimate of fluxes between boundary current and deep basins in the Nordic Seas: heat and freshwater budgets Katrin Latarius 1 and Detlef Quadfasel.

Deep circulation and meridional overturning Steve Rintoul and many others ….

Transport in the Subpolar and Subtropical North Atlantic

Assuming 16 cm standard deviation. The final result – 5 of these records were noisy Halifax Grand Banks Line W 4100 m 2700 m 3250 m 2250 m 1800 m.

NACLIM CT 2 Monitoring of North Atlantic parameters New Lead: Johannes Karstensen (GEOMAR) and Karin M. H. Larsen (HAV) WP 2.1 Exchanges across the Greenland-Scotland.

Contribution Contribution to monitoring the cold water route is constructed along 3 axes: 1- monitoring transport of the Malvinas Current 2- documenting.

DFO Northwest Atlantic Ocean Monitoring & Mooring Programs OSNAP Planning Meeting April 2011 BIO.

Equatorial Circulation and Tropical Atlantic Variability during the Tropical Atlantic Climate Experiment Peter Brandt 1, Andreas Funk 2, Alexis Tantet.

North Atlantic Observing System

THOR CT3 Meeting – Torshavn 2009 – Fischer/Visbeck/Zantopp/Nunes In the Labrador Sea, overflow water from the Denmark Strait and from the Iceland-Scotland.

Western boundary circulation and the role of deep eddies in the tropical South Atlantic Overview Western Boundary Circulation (Schott et al. 2004) - shipboard.

Mixed layer heat and freshwater budgets: Improvements during TACE Rebecca Hummels 1, Marcus Dengler 1, Peter Brandt 1, Michael Schlundt 1 1 GEOMAR Helmholtz.

PERD CCIES POL: Current & Temperature Changes along the Newfoundland and Scotian Shelf/Slope Focus: Potential occurrence and impacts of climate changes.

Northern and southern influences on the MOC Claus Böning (IFM-GEOMAR, Kiel) with Arne Biastoch, Markus Scheinert, Erik Behrens Northern and southern influences.

Ventilation of the Equatorial Atlantic P. Brandt, R. J. Greatbatch, M. Claus, S.-H. Didwischus, J. Hahn GEOMAR Helmholtz Centre for Ocean Research Kiel.

MOC related activities at NOC Joël Hirschi, Elaine McDonagh, Brian King, Gerard McCarthy Stuart Cunningham, Harry Bryden, Adam Blaker SAMOC workshop, Rio.

North Atlantic dynamical response to high latitude perturbations in buoyancy forcing Vassil Roussenov, Ric Williams & Chris Hughes How changes in the high.

Measuring the eastern boundary inflow to the Labrador Sea

The Kiel runs [ORCA025-KAB001 and KAB002] Arne Biastoch IFM-GEOMAR.

Labrador Sea Export -- the DWBC at 53°N as a Fingerprint of the AMOC? J. Fischer, J. Karstensen, M. Visbeck, R. Zantopp, R. Kopte Annual Conference, Berlin.

THOR Presented by Doug Smith (MET OFFICE) Project coordinator: Detlef Quadfasel (UHAM)

Western boundary circulation in the tropical South Atlantic and its relation to Tropical Atlantic Variability Rebecca Hummels1, Peter Brandt1, Marcus Dengler1,

On the effect of the Greenland Scotland Ridge on the dense water formation in the Nordic Seas Dorotea Iovino NoClim/ProClim meeting 4-6 September 2006.

On the role of circulation and mixing in the ventilation of the oxygen minimum zone of the eastern tropical North Atlantic Peter Brandt with contributions.

THOR meeting Paris November 25-26, 2009 North Atlantic Subpolar Gyre forcing on the fresh water exchange with the Arctic Ocean Christophe HERBAUT and Marie-Noëlle.

Ocean circulation in the Nordic Seas Kjell Arne Mork IMR/BCCR NOClim, Geilo 4/9-06.

Propagation of wave signals along the western boundary and their link to ocean overturning in the North Atlantic Vassil Roussenov 1, Ric Williams 1 Chris.

Coastal Oceanography Outline Global coastal ocean Dynamics Western boundary current systems Eastern boundary current systems Polar ocean boundaries Semi-enclosed.

Line W: A sustained measurement program sampling the North Atlantic Deep Western Boundary Current and Gulf Stream about 39°N 70°W Image copyrighted by.

Norwegian Meteorological InstituteM/S Nordkapp Fall 2003 Pathways of Atlantic Water Cecilie Mauritzen – Norwegian Meteorological Institute NOClim 2 Workshop,

10/24/03search_osm_10_032 Abrupt Change in Deep Water Formation in the Greenland Sea: Results from Hydrographic and Tracer Time Series SEARCH Open Science.

Seasonal Variations of MOC in the South Atlantic from Observations and Numerical Models Shenfu Dong CIMAS, University of Miami, and NOAA/AOML Coauthors:

I. Objectives and Methodology DETERMINATION OF CIRCULATION IN NORTH ATLANTIC BY INVERSION OF ARGO FLOAT DATA Carole GRIT, Herlé Mercier The methodology.

Outline of the talk Why study Arctic Boundary current? Methods Eddy-permitting/resolving simulations Observational evidence Mechanisms of the current.

Royal Netherlands Institute for Sea Research NIOZ Royal Netherlands Institute for Sea Research NIOZ is part of the Netherlands Organisation for Scientific.

ASOF II Objectives What are the fluxes of mass, heat, liquid freshwater and ice from the Arctic Ocean into the subpolar North Atlantic? How will anticipated.

The Ocean’s role in the climate system

Slow down of the THC and increasing hurricane activity

Shelf-basin exchange in the Western Arctic Ocean

Causes of Tropical Circulation Variability

Path Forward Discussion

RAPID AND SLOW COMMUNICATION OF OVERTURNING

by M. A. Srokosz, and H. L. Bryden

Jacob Opher Alex Brearley Stephen Dye Ian Renfrew Robert Pickart

Presentation transcript:

Past, current and envisioned activities in the Labrador Sea of IFM-GEOMAR (Kiel) Torsten Kanzow (tkanzow@ifm-geomar.de) Input from Jürgen Fischer, Nuno Nunez, Rainer Zantopp

Outline History of boundary current measurements at 53°N Goals of proposed experiment envisioned implementation, logistics, etc Future funding propects for 53°N Central Labrador Sea Mooring continued?

DWBC measurements at the exit of Labrador Sea Fischer et al. (2004)

DWBC measurements at the exit of Labrador Sea Warming of LSW at K9 Fischer et al. (2004) Fischer et al. (2010) Annual mean Velocity profiles

“The Impact of Ocean Margin Processes in the Labrador Sea on the Atlantic Meridional Overturning Circulation” proposed to German Science Association (DFG) by T. Kanzow and C. Böning (IFM-GEOMAR, KIEL) OSNAP Subpolar Observing System

Goals Observe seasonal changes of newly formed Labrador Sea Water in the DWBC at 53°N continuously (transports in density classes). Verify Pickart and Spall. What mechanism sets downwelling: Eddies or surface buoyancy fluxes? Are there strong seasonal changes in sinking? Link DWBC measurements to other OSNAP elements to infer Labrador Sea overturning continuously Maintain 53°N measurements as MOC indicator Role of boundary processes in Labrador Sea for the strength and temporal variability of the basin-wide MOC

Background A. Estimates for overturning in Labrador Sea are very uncertain Pickart and Spall (2007): 1 Sv (depth space) or 2 Sv (density space)  Based on spring /summer hydrographic data Numerical Simulation at 53°N: Same year ventilated / total transport Numerical Simulation: Ventilation tracer in May Brandt et al. (2007)

Downwelling 2. Lateral heat flux B. Downwelling in Labrador Sea takes place along boundaries (e.g. Spall 2004) Two main processes for downwelling: DWBC looses heat due to 2. Lateral heat flux 1. Heat loss to the atmosphere Eddy kinetic energy (Funk et al., 2009) Pickart et al. (2008)

Downwelling Downwelling produces along-boundary pressure change of opposite sign in upper and deep layer

Elements of proposed observing system 53°N array (red circles) to compute export of LSW, in collaboration with DFO-BIO, UW. Use of pressure sensor (blue triangle)at 3 isobaths (500m, 1000m, 1500m) both upstream (60.5°N) an downstream (53°N) of downwelling area at western boundary. Miguel Maqueda (Liverpool) will deploy additional pressure sensors at eastern end of AR7W line. Density mooring upstream of 53°N at the continental slope at western end of AR7W (green square) to observe mixed layer depths (near-boundary water transformation) , in collaboration with DFO-BIO.

The proposed modified 53°N array Current meter + density (CTD) to compute transport in density classes. Density (salinity) and oxygen to detect newly transformed waters near the boundary Upslope pressure sensors to compute downwelling

Propects of Future Funding for 53°N funded through BMBF (ministry of education and research) Second 4-year phase 2008 – 2012 Unclear whether 3rd observational phase will be possible (no call issued, yet; but positive signs received) Submitted proposal to DFG (German Research Association) to cover 2012 – 2014 Possibilities might also come up during next phase of EU THOR IFM-GEOMAR is progressing from Leibniz Association (WGL) to Helmholtz Association (HGF)  Long-term monitoring in Labrador Sea has been identified as activity to be covered through HGF basic funding (5 year funding; has yet to be reviewed)

High resolution modelling (Böning / Biastoch) Use of a high resolution (1/20°) nest in a global eddy-permitting (1/4°, ORCA025) model. Perform 50 year runs and sensitivity studies (e.g. isolation of buoyancy or wind forcing) to: Infer role of boundary processes in Labrador Sea for the strength and temporal variability of the basin-wide MOC Understand mechanisms for downwelling & locate areas of downwelling.

Logistics 2012 cruise Fischer & Quadfasel service ADCP in Flemish Pass (U Ham) service 53N array recover CentraL Labrador Sea mooring deploy BPRs at 60°N & 53°N hydrography in Labrador Sea of 53°N section to Cape Farewell Service Central Irminger Sea mooring (CIS; IFM-GEOMAR,KIEL) service Angmagssalik array Service Denmark Strait ADCPs (U Ham) Mixing/entrainment in overflow plume (U HAM: hydrography + moorings; IFM-GEOMAR: Micrstructure on AUV) 2014 cruise proposal need to be submitted in November 2011 2016 ...

Central Labrador Sea mooring Monitoring of mixed layer depths since 1995 Gaps party filled with Argo Float data Currenly funded through EU THOR Programme (ends 2012) Future is uncertain: Can Argo floats take over? will be a topic during Canada-Germany workshop (Halifax; 06/2011)