Hycom 2 1 development at rsmas george halliwell
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HYCOM 2.1 Development at RSMAS George Halliwell. HYCOM Development Included several vertical mixing algorithms Refine the hybrid vertical coordinate adjustment algorithm Miscellaneous algorithms Ongoing HYCOM Evaluation and Analysis Efforts Evaluate the vertical mixing algorithms

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HYCOM 2.1 Development at RSMAS George Halliwell

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Hycom 2 1 development at rsmas george halliwell

HYCOM 2.1 Development at RSMASGeorge Halliwell

  • HYCOM Development

    • Included several vertical mixing algorithms

    • Refine the hybrid vertical coordinate adjustment algorithm

    • Miscellaneous algorithms

  • Ongoing HYCOM Evaluation and Analysis Efforts

    • Evaluate the vertical mixing algorithms

    • Evaluate other algorithms

    • Provided 1.4-degree Atlantic model to C. Thacker for data assimilation studies

    • Climate studies

      • Upper limb of Atlantic meridional overturning circulation

      • Modes of Atlantic Ocean response to NAO atmospheric forcing

  • Planned HYCOM Evaluation and Analysis Efforts

    • West Florida shelf (with R. Weisberg and RSMAS HYCOM group)

    • Hurricane response (with D. Jacob and N. Shay)

    • Coupled hurricane model (with S. Chen)

    • Florida Current (with C. Mooers and RSMAS HYCOM group)


Vertical mixing choices in hycom 2 1

Vertical Mixing Choices in HYCOM 2.1

  • Vertical Mixing Models (surface to bottom)

    • KPP

    • Mellor-Yamada level 2.5 turbulence closure

  • Mixed Layer Models

    • Kraus-Turner A (hybrid)

    • Kraus-Turner B (hybrid, simplified, from Bleck global HYCOM)

    • Kraus-Turner C (MICOM mode, from MICOM 2.8)

    • Price-Weller-Pinkel dynamical instability model

  • Interior Diapycnal Mixing Models (for use with the mixed layer models)

    • Explicit algorithm A (hybrid, MICOM-like)

    • Explicit algorithm B (MICOM mode, from MICOM 2.8)

    • Implicit algorithm (hybrid, KPP without surface b.l. model)


Hycom atlantic ocean simulations

HYCOM Atlantic Ocean Simulations

  • Domain

    • Atlantic Ocean, 20S to 62N

    • Resolution: 2.0 degrees horizontal, 22 layers vertical

  • Forcing / Boundary Conditions / Initial Conditions

    • Surface forcing by COADS climatology

    • Relaxation to Levitus climatology at N/S boundaries

    • Relaxation to Levitus surface salinity

    • Initialized from p(latitude)

  • Model Runs

    • 30-year spinup

    • One-year analysis run

    • Winter (mid-February) and summer (mid-August) fields saved

  • Eight Cases Summarized Here to Illustrate Different Vertical Mixing Choices


Hycom 2 1 development at rsmas george halliwell

Latitude

Latitude

Winter and summer cross-sections along 29W. The central

sigma-0 value in the alternating white and gray bands of

the shading bar are the isopycnic reference values. Some

of the layer numbers are shown inside the shading bar. The

thick line is the diagnosed mixed layer base.


Hycom 2 1 development at rsmas george halliwell

Winter mixed layer thickness

(m).

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Winter barotropic stream-

function (Sv)

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Ekman spirals

produced by the

KPP and MY

mixing models

in the Westerlies

(top) and the

trade Winds

(bottom).

Produced from

32-layer exp-

eriments


Hycom 2 1 development at rsmas george halliwell

Winter SST (C) for the KPP

experiment (top left). Otherwise,

differences between the other

seven experiments and the KPP

experiment)

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Summer SST (C) for the KPP

experiment (top left). Otherwise,

differences between the other

seven experiments and the KPP

experiment)

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Winter SSH (m) for the KPP

experiment (top left). Otherwise,

differences between the other

seven experiments and the KPP

experiment)

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Winter sigma-0 for the KPP

experiment (top left) along

A 29W cross-section.

Otherwise, differences

between the other seven

experiments and the KPP

experiment)

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Winter SST differences (C)

between the eight experiments

and Levitus climatology.

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Summer SST differences (C)

between the eight experiments

and Levitus climatology.

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Winter sigma-0 differences

along 29W between the eight

experiments and Levitus

climatology.

Experiments:

KPP (k-profile parameterization)

MY (Mellor-Yamada 2.5)

PWP (Price-Weller-Pinkel)

KTAI (K-T A m.l., implicit diap.mix.)

KTAIP (same with penetrating sw. rad.)

KTAE (K-T A m.l., explicit diap. mix.)

KTB (K-T B m.l., implicit diap. mix.)

MIC (K-T C m.l., MICOM mode)


Hycom 2 1 development at rsmas george halliwell

Figure: Preliminary simulation for the Gilbert

case using HYCOM including three non-slab

Schemes: (a) mixed layer depth, (b) mixed

layer temperature, (c) zonal current,

(d) meridional current, and e) surface fluxes

to the atmosphere. The differences in the

directly forced region are much larger

between these schemes compared to those

used in MICOM simulations. A surface flux

difference of up to 500 Wm2is seen at the

point of closest approach of storm center.

Red, Green, Blue and Cyan lines represent

quantities simulated using KT, KPP, MY

and PWP schemes respectively.


Hycom 2 1 development at rsmas george halliwell

Hurricanes and analysis regions for HYCOM simulations


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