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Kuroshio Extension System Study KESS PowerPoint PPT Presentation


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KEO Surface flux buoy. Atmospheric Soundings. Kuroshio Extension System Study KESS. Identify and quantify the processes governing the variability of, and interactions between, the Kuroshio Extension, its recirculation gyre, and the North Pacific storm track. Field Experiment

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Kuroshio Extension System Study KESS

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Kuroshio extension system study kess

KEO Surface flux buoy

Atmospheric Soundings

Kuroshio Extension System Study KESS

Identify and quantify the processes governing the variability of, and interactions between, the Kuroshio Extension, its recirculation gyre, and the North Pacific storm track.

Field Experiment

Summer 2004-Summer 2006

GCM

POP

OGCM for Earth Simulator (OFES)


Kuroshio extension system study kess

Kuroshio Extension alternates between stable and meandering states on decadal time scales.

Qiu and Chen, 2005

  • During “elongated state”, the KE is stronger and more stable, its path is shifted northward, and recirculation is elongated.

  • During “contracted state”, KE is weaker and more variable, its path is shifted southward, and recirculation is contracted.


Kuroshio extension system study kess

Kuroshio Extension System Study KESS

KESS observed the transition from stable to unstable states.


Kuroshio extension system study kess

  • Recent KESS results …

  • Validation of GRACE in the Kuroshio Extension (Park et al. 2008).

  • An improved estimate of the turbulent heat flux over the Kuroshio/Oyashio Extension region (Tomito et al. 2008).

  • Assessment of the impact of the strong Kuroshio Extension SST front on the marine atmospheric boundary layer (Tanimoto et al. 2008).

  • Kuroshio Extension northern recirculation gyre, observation and forcing mechanism (Qiu et al. 2008).

  • Generation of deep eddies by interaction of deep Rossby-wave field with topography (Greene et al. 2008).

  • Eddy-Mean Flow Interactions in Western Boundary Current Jets: (Waterman et al. 2008).

  • …and to see more results


Kuroshio extension system study kess

KESS website (uskess.org) organizes presentations, publications, data, and data products.


Kuroshio extension system study kess

  • Process Study “Best Practices”

  • Modelers and observationalists should be integrated in the study from the planning stage onward.

  • Broad use of the data should be encouraged through:

    • oopen data policies

    • ocentralized access to all components of experiment

    • oarchiving data in format intended for broad use

  • Synthesis data sets should be created that can be used as benchmarks for assessing and validating models.

  • *

    * …getting there as data products vetted through analysis and publication


    Kuroshio extension system study kess

    Examples of soon-to-come data products…

    Interannual variability in recirculation gyre.

    Deep EKE stable vs. unstable

    Stream-coordinate structure of KE


    Kuroshio extension system study kess

    Where does KESS go from here…

    Continue to update centralized web site with presentations, publications, and more importantly data products.

    Maintain momentum via analysis proposals focused on processes with observationally-driven numerical and theoretical studies.

    For example,

    Ocean response to atmospheric forcing (NSF pending)


    Kuroshio extension system study kess

    • KESS captured a transition between stable and unstable states.

    • KE system is transitioning back to a stable state in concert with a change in the PDO phase from positive to negative.

    unstable

    -ve PDO

    stable

    +ve PDO

    From Bo Qiu


    Kuroshio extension system study kess

    KE regime shift is associated with changes in the structure of the recirculation gyre.

    • Stable KE

    • favors the maintenance of a weak stratification,

    • leads to a deep winter mixed layer, and

    • leads to formation of a thick STMW layer.

    From Bo Qiu


    Kuroshio extension system study kess

    In order to better capture this unstable-to-stable transition, Japanese colleagues at JAMSTEC and

    US scientists at UH and UW will release 10 US Argo floats in the KE's southern RG this September.

    Facilitate bilateral cooperation.

    From Bo Qiu


    Kuroshio extension system study kess

    KEO Surface flux buoy

    Atmospheric Soundings

    Kuroshio Extension System Study (KESS)

    KESS GOAL

    Identify and quantify the processes governing the variability of, and interactions between, the Kuroshio Extension, its recirculation gyre, and the North Pacific storm track.


    Kuroshio extension system study kess

    • KESS captured a transition between stable and unstable states.

    • KE system is transitioning back to a stable state in concert with a change in the PDO phase from positive to negative.

    unstable

    -ve PDO

    stable

    +ve PDO

    From Bo Qiu


    Kuroshio extension system study kess

    KE regime shift is associated with changes in the structure of the recirculation gyre.

    • Stable KE

    • favors the maintenance of a weak stratification,

    • leads to a deep winter mixed layer, and

    • leads to formation of a thick STMW layer.

    From Bo Qiu


    Kuroshio extension system study kess

    • The overall goal of KESS is to identify and quantify the dynamic and thermodynamic processes governing the variability of and the interaction between the Kuroshio Extension and the recirculation gyre. The objectives of KESS.

    • Objectives

    • To understand processes coupling the baroclinic and barotropic circulation and variability of the Kuroshio Extension System.

    • To determine and quantify cross-frontal exchange processes in the Kuroshio Extension.

    • To determine the processes that govern the strength and structure of the recirculation gyre - its position, elongation, stratification, and subtropical mode water formation within the gyre.


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