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WAVE array update and modelling background. Chris W. Hughes, Miguel Angel Morales Maqueda, Shane Elipot, Rory Bingham 1 NOC (Proudman Building, Liverpool) 1 ex POL, now University of Newcastle. Bingham et al., GRL 2007. A good rule of thumb:

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wave array update and modelling background

WAVE array update and modelling background

Chris W. Hughes, Miguel Angel Morales Maqueda, Shane Elipot, Rory Bingham1

NOC (Proudman Building, Liverpool)

1 ex POL, now University of Newcastle

slide3

A good rule of thumb:

Assume a layer thickness of 1000 m, and a midlatitude f = 10-4

Then 1 cm of sea level or 1 mbar of pressure represents 1 Sv of transport

slide4

Northward transports, integrated zonally and over the depth ranges

100-1300 m 1300-3000 m

Actual transports, and transports from pressure differences

Using pressures from east and west

Using pressures from west only, and ignoring any pressure changes which are constant with depth.

Bingham and Hughes, JGR 2008

slide5

Sv

-4

-3

-2

-1

0

1

2

3

4

Bingham and Hughes, GRL 2009

slide12

Total Difference from eastern boundary mean

0.75 2.5

0.20 2.0 cm

slide14

Sv

-4

-3

-2

-1

0

1

2

3

4

Bingham and Hughes, GRL 2009

slide16

First EOF of bottom pressure in a 50-year MICOM simulation at ¼ degree (simulation by Vassil Roussenov)

slide19

Zhang, GRL 2010

GFDL CM2.1 (coarse resolution coupled climate model)

Meridional coherence of MOC when plotted in density coordinates

slide20

Southward transport of NADW

Marsh et al., GRL 2005

¼ degree OCCAM

slide21

Line B (2004-2008)

RS Line (2008-…)

slide22

RS1

RS2

RS3

RS4

RS5

RS6

slide24

Pressure difference between RS1 and RS2

Direct measurement

Reconstruction from currents and density

A pressure of 10 Pa is equivalent to 1 mm of water

slide25

Pressure difference between RS2 and RS4

Direct measurement

Reconstruction from currents and density

A pressure of 10 Pa is equivalent to 1 mm of water

slide26

Directly-measured pressure differences relative to 1100 m (RS1), and

differences inferred using the stepping method ( 1-50 day band pass filter)

conclusions
Conclusions
  • We have an in-situ monitoring system for pressure differences that can produce drift-free measurements with 0.2-0.3 mbar accuracy.
  • Models suggest that subcentimetre variability in the western basin is limited to a narrow strip on the continental slope.
  • A variety of models show interannual bottom pressure variations being dominated by an MOC-like mode in this strip.
  • This mode seems to continue throughout the western half of the Labrador Sea
slide28

Simple, works fairly well, ignores complex topography

Assumes topographic steering dominates. Works better, but ignores one component of velocity.

Assumes topographic steering dominates but generalises to include both velocity components. Works better still, and reduces to simple case when topography is smooth.