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Western Boundary Current Working Group
CLIVAR Summit
Irvine, CA
Panel MembersWG Established Jan 2007
• Kathie Kelly (co-chair), University of Washington
• Bo Qiu (co-Chair), University of Hawaii
• Michael Alexander (NOAA/ESRL)
• Nick Bond (U Washington)
• Meghan Cronin (NOAA/PMEL)
• Claude Frankignoul (LODYC, Paris)
• Terry Joyce (WHOI)
• Young-oh Kwon (WHOI)
• Hisashi Nakamura (U. of Tokyo, Frontier)
• Roger Samelson (Oregon State)
• Justin Small (Naval Research Lab Stennis Space Center)
• LuAnne Thompson (U Washington)
Scientific Issues
• How does air-sea interaction compare in the western North Atlantic and North Pacific?
• What are the implications of the differences?*
• What is the nature of atmosphere-ocean interaction in WBC regions?
• On what temporal and spatial scales does it occur?
• Is there predictability in the system?
• To what extent are coupled models getting the interaction right?
• Can we identify specific problems in ocean or atmosphere models?
• What numerical experiments need to be done to test hypotheses?
• To what extent does air-sea interaction extend beyond the boundary layer and influence broader climate variability in both the atmosphere and ocean?
Activities• Write two review articles on Air-Sea Interaction in
Kuroshio Extension/Gulf Stream Regions– 1) Frontal-scale
• (Kelly, Qiu, Joyce, Frnakignoul, Small)
– 2) Basin-Scale • (Kwon, Alexander, Frankignoul, Nakamura, Bond, Thompson)
• Topics• Incorporate new findings from KESS/Climode (F/B)• Findings from high resolution atmosphere and ocean models (F)• Examine local and remote effects (F)• Cross Scale Interactions (F/B)• Assessment of current IPCC-Class models (B)• Discuss outstanding issues (F/B)
• Conduct new analyses in support of papers• Papers to be submitted to J. Climate Jan 09• Create on-line atlas of WBC relevant fields
Frontal Scale Air-Sea Interaction
●Mean and variability of the Gulf Stream and Kuroshio Extension●Time-varying dynamic signals ●Time-varying thermodynamic signals●Understanding the GS and KE indices•Atmosphere-ocean interaction
RMS of net surface heat flux (top) and SSH variability (bottom) for KE (left) and GS (right),contour mean SSH
Courtesy of K. Kelly
Poster by T. Joyce on fronts and surface expression of storm track variability
Observed Impact of the Gulf Stream on the Atmosphere
Minobe et al., Nature, 2008
Winter SST Variability in Obs and Ocean Model for the Earth Simulator
(OFES) 0.1° lat x 0.1° lon, 56 levels
Nonaka et al.,J Climate,2006
JFMSST
Dynamics of KE region
1989
2006
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PDOSSH from data SSH from wave model
PDO Wind Curl forcing
SST Impact of SST in the Kuroshio Extension on the Atmosphere
Provided byC. Frankignoul
Regression of a) SST (AMJ) b) z250 (AS0) c) on SSTA in KE
Region in AMJ
Qiu et al., J Climate, 2007
Decadal variability in the North Pacific Atmosphere ocean system
3-equation observational based heuristic model
WorkshopLogistics
Phoenix, AZ January 2009
• Thursday Jan 15th - Saturday 18th (3 full days)
• One day overlap with Annual AMS meeting • coordinating with AMS Air-Sea Interaction
• Optional joint sessions on Wednesday 14th
• Hotel & other logistics worked out shortly
ScienceI Four half day sessions with presentations on topics
1. Insights from KESS/CLIMODE field programs
2. Frontal-scale air-sea interaction over WBCs
3. Large-scale air-sea interaction in connection with WBCs
4. Impact of upper ocean variability in WBC regions on midlatitude climate variability and predictability
Workshop IIII Discussion and future directions (3rd day)• What are the cutting-edge science issues for the WBC air-sea
interaction? • What are beyond the KESS/CLIMODE programs?• Identify requirements for ocean and atmospheric observing
systems in WBC regions• What WBC metrics are most relevant for the modeling
community?• What modeling experiments should be considered; e.g. impact
of SST, ocean heat content anomalies on atmosphere?
Potential outcomes• Ideas for new field programs and/or observation systems• Coordinated model experiments• Identification of metrics for coupled models
Additional Activities
• Supporting Activities– Monthly teleconferences– Met in Portland in conjunction with AMS Air-Sea
Interaction Conference Aug 07– Climate Variations Article (Dec 2007)– Web page http://www.usclivar.org/wbc.php
• Telcon notes, • science, • references, • links
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