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1/12°North Atlantic HYCOM Development (Sv) Depth of switch to net southward transport σ 0, MPDATA...
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1/12°North Atlantic HYCOM Development HYCOM NOPP GODAE Meeting RSMAS, University of Miami, FL 27-29 October 2004 T. Townsend 1 , E. Chassignet 2 , Z. Garraffo 2 , P. Hogan 1 , H. Hurlburt 1 , W. Schmitz, Jr 3 , L. Smith 2 , and A. Wallcraft 1 1 Naval Research Laboratory, Stennis Space Center, MS 2 RSMAS, University of Miami, FL 3 Conrad Blucher Institute, TAMU-Corpus Christi, TX
Transcript of 1/12°North Atlantic HYCOM Development (Sv) Depth of switch to net southward transport σ 0, MPDATA...
1/12°North Atlantic HYCOM Development
HYCOM NOPP GODAE MeetingRSMAS, University of Miami, FL
27-29 October 2004
T. Townsend1, E. Chassignet2, Z. Garraffo2, P. Hogan1,H. Hurlburt1, W. Schmitz, Jr3, L. Smith2, and A. Wallcraft1
1 Naval Research Laboratory, Stennis Space Center, MS2 RSMAS, University of Miami, FL
3 Conrad Blucher Institute, TAMU-Corpus Christi, TX
1/12° North Atlantic HYCOM Simulations
NoFCT2σ2*
Deeper z’sHYCOM-11.4
NoMPDATAσ0MICOM
YesFCT2σ0
Shallow z’sHYCOM-7.3
NoMPDATAσ0
Shallow z’sHYCOM-2.5
VariableTarget ρ
AdvectionScheme
VerticalCoordinate
Experiment
February Mean KPP Mixed Layer Thickness1/12° North Atlantic HYCOM
ERA-15 wind (+ high-frequency anomalies) and thermal forcingand relaxation to GDEM3 at northern and southern boundaries
Year 10 Year 10
σ0MPDATA
σ0FCT2
Sea Surface Height Snapshot1/12° North Atlantic HYCOM
σ0MPDATA
σ0FCT2
ERA-15 wind (+ high-frequency anomalies) and thermal forcingand relaxation to GDEM3 at northern and southern boundaries
σ0MPDATA
vsigma=false
σ0FCT2
Vsigma=true
Mediterranean Sea Surface Height Snapshot1/12° North Atlantic HYCOM
Mediterranean Sea – Vertical Discretization1/12° North Atlantic HYCOM
T, °C
σ0, vsigma=false σ0, vsigma=true
T, °C
S, psu S, psu
Mediterranean Outflow1/12° North Atlantic HYCOM
σ0FCT2
T,°C
S, psu
Mediterranean Outflow -1/12° North Atlantic HYCOM
σ0MPDATA
MICOM
σ0FCT2
σ2*FCT2
T,°C S, psu
Meridional Overturning Streamfunction1/12° North Atlantic HYCOM
Upper Net NorthwardTransport (Sv)
Depth of switch tonet southwardtransport
σ0, MPDATAσ0, FCT2σ2*, FCT2
Yucatan Channel Annual Mean Velocity1/12° North Atlantic HYCOM
Observed
m/s
σ2*FCT2
Abascal et al., 2001
MICOM
σ0FCT2
σ0MPDATA
Florida Current Annual Mean Velocity1/12° North Atlantic HYCOM
σ0FCT
σ2*FCT2
MICOMσ0
MPDATA
Florida Current Annual Mean T & S1/12° North Atlantic HYCOM
σ0FCT2
MICOMσ0
MPDATA
σ2*FCT2
MICOMσ0
MPDATA
σ0FCT2
σ2*FCT2
T, °C S, psu
Atlantic-to-Caribbean 1-Yr Mean Transports1/12° North Atlantic HYCOM
105022.5~1515.82.72.43.70.422.0-1.02.932.07.824.2σ2*FCT
125016.2~1716.03.02.62.23.323.8-1.02.135.210.125.1σ0
FCT
1700or1300
32.6~2521.65.55.02.20.729.6-0.71.2240.210.230.0σ0
MP1
125016.2~3021.65.77.71.9-3.927.6-0.61.342.914.828.1σ0
MP
22.129.66.84.82.4-4.432.5-0.71.056.423.732.7M
AvgDep
DWBCAbac
MOCN’wd
L.A.GrenAnegMonaWWYucCh
OBCNWPFC+Abac
AbacFC27NExpt
1 Interim experiment with longer relaxation time scale at southern boundary
Summary of Improvements1/12° North Atlantic HYCOM
MPDATA vs FCT2:
More realistic Med salinity tongue and eliminationof un-observed dense pool sitting on bottom.
More realistic depth of change from net northwardflow to net southward flow of MOC, but is itShallow enough?.
AABW present (How realistic?).
σ2* vs σ0:
Eliminated excessive deep mixing in subpolar gyre.Restored MOC amplitude to observed value; depth
of switch from net northward to net southwardflow still too deep.
Dramatically improved subpolar gyre circulation.Much improved Mediterranean circulation and
vertical discretization (even in σ2* case dueto deeper z-levels).
What Next?1/12° North Atlantic HYCOM
Further & more detailed analysis of water massand transport pathways.
Examination of Sverdrup flow from differentwind forcing fields for clues about the realismof the wind-driven transport in the model.
Investigate ways to handle the sill depth error(s) inthe bottom topography?
1/12° North Atlantic HYCOM…
Stay Tuned
