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CLIVAR/GODAE Synthesis Evaluation

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CLIVAR/GODAE Synthesis Evaluation. Tony Lee, JPL. Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake Passage Florida Current at Florida Strait. RTS smoother. 3D-VAR. Some details about legends. ITF.

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Presentation Transcript
slide1

CLIVAR/GODAE Synthesis Evaluation

Tony Lee, JPL

  • Item#5: volume transport, temperature & salinity fluxes through key straits:
  • Indonesian throughflow (ITF)
  • ACC at Drake Passage
  • Florida Current at Florida Strait
slide2

RTS smoother

3D-VAR

Some details about legends

slide4

ITF volume transport (Sv)

Total

Spinup problem

Island Rule doesn’t work? Or effect of geometry/topography?

Anomaly relative to 1993-2001 mean

Remarkable consistency

slide5

ITF volume transport from 1992 (Sv)

Total

Anomaly relative to 1993-2001 mean

slide6

ITF temperature flux (PW)

Total

Anomaly relative to 1993-2001 mean

slide7

ITF temperature flux from 1992

Total

Anomaly relative to 1993-2001 mean

slide8

ITF salinity flux

Total

Anomaly relative to 1993-2002 mean

slide9

ITF salinity flux from 1992

Total

Anomaly relative to 1993-2001 mean

slide11

ITF property flux (volume, heat, and salt) estimated by various products are overall consistent (for mean as well as for seasonal, interannual, and decadal variability: e.g., large magnitude of seasonal cycle relative to mean value, low ITF during El Nino, lack of decadal variability.

slide13

ACC volume transport

Total

Anomaly relative to 1993-2001 mean

slide14

ACC volume transport from 1992

Total

Anomaly relative to 1993-2001 mean

slide15

ACC temperature flux

Total

No such large adjustment in volume transport

Relatively consistent decadal variability

Anomaly relative to 1993-2001 mean

slide16

ACC temperature flux from 1992

Total

Anomaly relative to 1993-2001 mean

slide17

ACC salinity flux

Total

Anomaly relative to 1993-2001 mean

slide18

ACC salinity flux from 1992

Total

Anomaly relative to 1993-2001 mean

slide20

Relatively large difference in mean and seasonal variability, but relatively consistent on decadal time scale.

slide22

Two different ways of computing Florida Current (FC) transport by various groups:

  • meridional transport near 26.5N between Florida (~80W) to 75W (more consistent with cable measurements),
  • zonal transport between Florida and Cuba (better defined in models).
  • The time mean of (2) is significantly smaller than that of (1) because a portion of (1) comes through a “short circuit” north of the Caribbean instead of from the loop Current (esp. in models)
slide23

FC volume transport

Total

Grey curve – cable data

Anomaly relative to 1993-2001 mean

slide24

FC volume transport from 1992

Total

Grey curve – cable data

Anomaly relative to 1993-2001 mean

slide25

Zonal (upper) and meridional (lower) Florida Current transports

Zonal: between Florida & Cuba (well-defined)

Meridional: 26.5N, 80-75W (near cables)

Grey curve – cable data

slide26

FC temperature flux

Total

Anomaly relative to 1993-2001 mean

slide27

FC temperature flux from 1992

Total

Anomaly relative to 1993-2001 mean

slide28

FC salinity flux

Total

Anomaly relative to 1993-2001 mean

slide29

FC salinity flux from 1992

Total

Anomaly relative to 1993-2001 mean

slide31

Relatively large spread, partly because of definition problem.

In most models, the flow going into the Gulf of Mexico is weak; some flow take a short cut north of Cuba to joint the Florida Current.

slide33

1993-2001 mean transports/fluxes: For Florida Current: black - meridional transport near 26.5N, 80-75W; red – zonal transport between Florida & Cuba.

slide34

The largest mean ITF (> 23Sv): consistent with Island rule (integration of South Pacific curl)? Or effect of geometry/topography?

High mean ACC transports (170-180 Sv): too strong zonal wind? lack of form drag due to smooth topography? Small viscosity?

slide35

1993-2001 rms variability of volume transport, rms difference among models, and rms difference from cable measurements

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