CLIVAR/GODAE Synthesis Evaluation
Download
1 / 35

CLIVAR/GODAE Synthesis Evaluation - PowerPoint PPT Presentation


  • 110 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' CLIVAR/GODAE Synthesis Evaluation' - isha


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

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 volume transport (Sv)

Total

Spinup problem

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

Anomaly relative to 1993-2001 mean

Remarkable consistency


ITF volume transport from 1992 (Sv)

Total

Anomaly relative to 1993-2001 mean


ITF temperature flux (PW)

Total

Anomaly relative to 1993-2001 mean


ITF temperature flux from 1992

Total

Anomaly relative to 1993-2001 mean


ITF salinity flux

Total

Anomaly relative to 1993-2002 mean


ITF salinity flux from 1992

Total

Anomaly relative to 1993-2001 mean



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.


ACC 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.


ACC volume transport 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.

Total

Anomaly relative to 1993-2001 mean


ACC volume transport from 1992 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.

Total

Anomaly relative to 1993-2001 mean


ACC temperature flux 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.

Total

No such large adjustment in volume transport

Relatively consistent decadal variability

Anomaly relative to 1993-2001 mean


ACC temperature flux from 1992 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.

Total

Anomaly relative to 1993-2001 mean


ACC salinity flux 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.

Total

Anomaly relative to 1993-2001 mean


ACC salinity flux from 1992 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.

Total

Anomaly relative to 1993-2001 mean


1993-2001 averaged seasonal anomaly of ACC 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.


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


Florida Current variability, but relatively consistent on decadal time scale.at Florida Strait


  • 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)


FC volume transport transport by various groups:

Total

Grey curve – cable data

Anomaly relative to 1993-2001 mean


FC volume transport from 1992 transport by various groups:

Total

Grey curve – cable data

Anomaly relative to 1993-2001 mean


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


FC temperature flux transports

Total

Anomaly relative to 1993-2001 mean


FC temperature flux from 1992 transports

Total

Anomaly relative to 1993-2001 mean


FC salinity flux transports

Total

Anomaly relative to 1993-2001 mean


FC salinity flux from 1992 transports

Total

Anomaly relative to 1993-2001 mean



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.



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


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?


1993-2001 rms variability of volume transport, (integration of South Pacific curl)? Or effect of geometry/topography?rms difference among models, and rms difference from cable measurements


ad