Regional air sea interactions in eastern pacific
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Regional Air-Sea Interactions in Eastern Pacific. Hyodae Seo Scripps Institution of Oceanography. 6th International RSM Workshop Palisades, New York July 11-15, 2005. Outline. 1. Regional Ocean Atmosphere Coupled Model 2. Research

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Regional Air-Sea Interactions in Eastern Pacific

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Regional air sea interactions in eastern pacific

Regional Air-Sea Interactions in Eastern Pacific

Hyodae Seo

Scripps Institution of Oceanography

6th International RSM Workshop

Palisades, New York

July 11-15, 2005


Outline

Outline

  • 1. Regional Ocean Atmosphere Coupled Model

  • 2. Research

    1. Gap-Induced Low-Level Winds and Air-Sea Interaction in Central America

    2. Atmospheric Boundary Layer Adjustment to Tropical Instability Waves (TIWs) in Eastern Tropical Pacific

  • 3. Summary


Regional ocean atmosphere coupled model

Regional Ocean-Atmosphere Coupled Model


1 model and coupler description

1. Model and Coupler Description

Regional Ocean-Atmosphere Coupled Model

  • Bulk Formula in BL

Atmosphere

  • Winds Relative to Ocean

Ocean

Boundary Layer Variables

Regional Spectral Model

(RSM)

COARE Bulk Formula

Plus Winds relative to ocean currents

Regional Ocean Modeling System (ROMS)

  • Sequential Coupling

  • Coupling Frequency

  •  3 hourly coupling

  •  Daily coupling

SST

Lateral BC: Ocean Data

Assimilation Product (JPL)

IC and Lateral BC: NCEP/DOE Reanalysis


Gap induced low level winds and air sea interaction in central america

Gap-Induced Low-level Winds and Air-Sea Interaction in Central America

OBSERVATION: Xie et al., 2005

Jan-Mar SST and Windstress Climatology

Tehuantepec

Papagayo

Panama


2 1 gap winds and air sea interaction

2.1. Gap Winds and Air-Sea Interaction

1999-2003 Model Climatology

Sea Surface Temperature (C)

Ekman Pumping Velocity (10^-6 m/s)

Precipitation (mm/day)

Winter

Winter

Winter

Tehuantepec

Papagayo

Panama

Costa Rica Dome

Upwelling by Papagayo Jet

Summer

Summer

Summer

Cold SST

Dry Hole


Atmospheric boundary layer response to tropical instability waves tiws in eastern tropical pacific

Atmospheric Boundary Layer Response to Tropical Instability Waves (TIWs) in Eastern Tropical Pacific

Global SST Image from microwave satellites

Aug 25-27, 1999 (Wentz et al.)

Tropical Instability Waves (TIWs)


Regional air sea interactions in eastern pacific

2.2 Atmospheric BL Adjustment to SSTsa. Winds and SST

June 21 – October 20 1999

OBSERVED SSTs

MODEL SST

  • 3 month average of wind-stress and SST

  • Similar gross

  • patterns of winds and

  • SST during

  • TIWs season

MODEL Wind Stress

OBSERVED Wind Stress

Chelton et al., 2001


Regional air sea interactions in eastern pacific

2.2 Atmospheric BL Adjustment to SSTsb. Temporal/Spatial Associations

Tropical Instability Waves (TIWs) and Winds

MODEL: 1999 - 2003 along 2N

SST

Stress

Div

June 2003

Jun - Dec. 1999

SST

June 2002

June 2001

Wind Stress

June 2000

Wind-Divergence

June 1999


2 2 atmospheric bl adjustment to ssts c stability of atmospheric bl due to ssts

2.2 Atmospheric BL Adjustment to SSTsc. Stability of Atmospheric BL Due to SSTs

Typical TIWs and Winds

September 2 - 4, 1999

Atmospheric Temp

Warm Phase: 173,

Cold Phase: 217

UNSTABLE

September 2 - 18, 1999

Specific Humidity

Vir. Pot. Temp.

STABLE

Ocean Temp

UNSTABLE

STABLE

U-Wind

V-Wind


2 2 atmospheric bl adjustment to ssts d isotherms and wind vectors dynamic feedback

2.2 Atmospheric BL Adjustment to SSTsd. Isotherms and Wind Vectors: Dynamic Feedback

Typical Patterns of

Winds and SST

Chelton, 2001

MODEL

OBSERVATION

Wind Stress Divergence

Wind Stress Divergence

Wind Stress Curl

Wind Stress Curl

Chelton, 2005

Implication of DYNAMIC FEEDBACK


2 2 atmospheric bl adjustment to ssts e thermodynamic feedback

2.2 Atmospheric BL Adjustment to SSTse. Thermodynamic Feedback

MODEL SIMULATION

Less Cooling

Latent Heat Flux

Latent and Sensible Heat

Flux damp the SST anomaly;

Turbulent flux provides

NEGATIVE FEEDBACK

To SST by TIWs.

More Cooling

Sensible Heat Flux


3 summary

3. Summary

  • High-resolution ocean-atmosphere coupled model has been developed to study air-sea interactions in various parts of the World Ocean.

  • Mesoscale SST induces atmospheric boundary layer adjustment, which may feed back onto ocean.

  • Central American gap winds force upper ocean thermocline topography, which in turn affects atmospheric deep convection and precipitation.


Regional air sea interactions in eastern pacific

Thanks!


Model domain

Model Domain


Regional air sea interactions in eastern pacific

Southern California Coast

Over Warm Eddies: ~ 100km

Wind Stress Curl

SST & Wind Stress

Wind Stress Curl

Wind Stress Div

Latent Heat Flux

Additional Example of relations between wind stress vector

and isotherms in southern California coastal ocean


Regional air sea interactions in eastern pacific

Model Bias: Low-level CloudinessEastern Pacific

  • Stratus/Stratocumulus are overestimated over south east Pacific (because of colder SSTs in model?)

1999-2000 Mean Low-level Cloud

OBSERVATION

MODEL

1999-2003 Mean SST

OBSERVATION

MODEL

Month

Month

Month

Longitude

Longitude

Longitude

Longitude


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