Contribución del IEO a CLIVAR Seminario CLIVAR-España. Madrid 14-15 Febrero 2005.
CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through...
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Transcript of CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through...
![Page 1: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/1.jpg)
CLIVAR/GODAE Synthesis Evaluation
Item#5: volume transport, temperature & salinity fluxes through key straits:
• Indonesian throughflow (ITF)
• ACC at Drake Passage
• Florida Current at Florida Strait
Tony Lee, JPL
![Page 2: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/2.jpg)
Some details about legends
3D-VAR
RTS smoother
![Page 3: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/3.jpg)
ITF
![Page 4: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/4.jpg)
ITF volume transport (Sv)
Anomaly relative to 1993-2001 mean
Total
Spinup problem
Remarkable consistency
Island Rule doesn’t work? Or effect of geometry/topography?
![Page 5: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/5.jpg)
ITF volume transport from 1992 (Sv)
Total
Anomaly relative to 1993-2001 mean
![Page 6: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/6.jpg)
ITF temperature flux (PW)
Total
Anomaly relative to 1993-2001 mean
![Page 7: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/7.jpg)
ITF temperature flux from 1992
Total
Anomaly relative to 1993-2001 mean
![Page 8: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/8.jpg)
ITF salinity flux
Total
Anomaly relative to 1993-2002 mean
![Page 9: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/9.jpg)
ITF salinity flux from 1992
Total
Anomaly relative to 1993-2001 mean
![Page 10: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/10.jpg)
1993-2001 averaged seasonal anomaly of ITF
![Page 11: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/11.jpg)
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.
![Page 12: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/12.jpg)
ACC
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ACC volume transport
Total
Anomaly relative to 1993-2001 mean
![Page 14: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/14.jpg)
ACC volume transport from 1992
Total
Anomaly relative to 1993-2001 mean
![Page 15: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/15.jpg)
ACC temperature flux
Total
Anomaly relative to 1993-2001 mean
Relatively consistent decadal variability
No such large adjustment in volume transport
![Page 16: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/16.jpg)
ACC temperature flux from 1992
Total
Anomaly relative to 1993-2001 mean
![Page 17: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/17.jpg)
ACC salinity flux
Total
Anomaly relative to 1993-2001 mean
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ACC salinity flux from 1992
Total
Anomaly relative to 1993-2001 mean
![Page 19: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/19.jpg)
1993-2001 averaged seasonal anomaly of ACC
![Page 20: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/20.jpg)
Relatively large difference in mean and seasonal variability, but relatively consistent on decadal time scale.
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Florida Current at Florida Strait
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Two different ways of computing Florida Current (FC) transport by various groups:
(1) meridional transport near 26.5N between Florida (~80W) to 75W (more consistent with cable measurements),
(2) 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)
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FC volume transport
Anomaly relative to 1993-2001 mean
Total
Grey curve – cable data
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FC volume transport from 1992
Total
Anomaly relative to 1993-2001 mean
Grey curve – cable data
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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
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FC temperature flux
Total
Anomaly relative to 1993-2001 mean
![Page 27: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/27.jpg)
FC temperature flux from 1992
Total
Anomaly relative to 1993-2001 mean
![Page 28: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/28.jpg)
FC salinity flux
Total
Anomaly relative to 1993-2001 mean
![Page 29: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/29.jpg)
FC salinity flux from 1992
Total
Anomaly relative to 1993-2001 mean
![Page 30: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/30.jpg)
1993-2001 averaged seasonal anomaly of Florida Current
![Page 31: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/31.jpg)
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.
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Summary Statistics
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ITF FC ACC ITFt ITFs FCt FCs ACCt ACCs
Sv Sv Sv PW PW PW Kg/s Kg/s Kg/s
K7 -12.4 157
CRFS-A -12.9 16.6 147
CRFS-2 -13.2 24.2 147
ECCO-50yr -11.0 29.3 129 -1.0 -0.4 2.1 1.1 1.4 4.5
ECCO-SIO -10.7 30.6 154 -0.9 -0.4 2.2 1.1 1.6 5.3
ECMWF -10.6 14.8 148
GFDL -15.7 24.3 171 -1.0 -0.6 1.6 0.8 1.7 6.1
INGV -11.9 24.6 127 2.8 0.9
MOVE-G -23.4 179
ECCO-JPLKF -13.2 27.6 132 -1.2 -0.5 2.3 1.0 1.4 4.6
MCTR 3DVAR -18.7 15.0 142
MCTR KF -12.8 21.8 149
ECCO-GODAE -11.1 26.6 148 -0.9 -0.4 1.9 1.0 1.5 5.1
SODA -14.5 27.5 158 -1.2 -0.5 2.1 1.0 1.7 5.6
Obs. Analysis -10 ~ -15
31.9 120~160
1993-2001 mean transports/fluxes: For Florida Current: black - meridional transport near 26.5N, 80-75W; red – zonal transport between Florida & Cuba.
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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?
![Page 35: CLIVAR/GODAE Synthesis Evaluation Item#5: volume transport, temperature & salinity fluxes through key straits: Indonesian throughflow (ITF) ACC at Drake.](https://reader033.fdocuments.net/reader033/viewer/2022051216/5697bfdc1a28abf838cb11d7/html5/thumbnails/35.jpg)
(all in Sv) ITF FC ACC rms dev. of FC from cable data
K7 3.5 7.0
CRFS-A 5.0 4.7 6.4 4.9
CRFS-2 5.2 4.7 6.2 5.3
ECCO-50yr 2.4 1.6 4.1 2.9
ECCO-SIO.it69 2.5 2.2 4.6 3.1
ECMWF 3.0 2.2 4.0 3.0
GFDL 2.5 2.8 5.0 3.6
INGV 3.1 5.6 3.5 5.5
MOVE-G 4.0 6.3
ECCO-JPL RTS smoother 3.0 3.0 4.1 3.4
MCTR 3DVAR 5.5 5.1 6.6 5.3
MCTR KF 3.2 1.4 4.6 2.8
ECCO-GODAE.v2.199 2.6 2.2 4.4 3.3
SODA 4.3 2.6 4.5 5.0
rms diff. among models 2.3 3.0 3.5
Measurement 2.5
1993-2001 rms variability of volume transport, rms difference among models, and rms difference from cable measurements