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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

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Kuroshio Extension System Study KESS

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  1. 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)

  2. 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.

  3. Kuroshio Extension System Study KESS KESS observed the transition from stable to unstable states.

  4. 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

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

  6. 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: • o open data policies • o centralized access to all components of experiment • o archiving 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

  7. Examples of soon-to-come data products… Interannual variability in recirculation gyre. Deep EKE stable vs. unstable Stream-coordinate structure of KE

  8. 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)

  9. 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

  10. 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

  11. 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

  12. 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.

  13. 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

  14. 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

  15. 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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