vocal vamos ocean – cloud – atmosphere - land study
DESCRIPTION
VOCAL VAMOS Ocean – Cloud – Atmosphere - Land study. VOCAL THEME. The theme of VOCAL is to better understand and simulate how marine boundary layer cloud systems surrounding the Americas interact with the coupled ocean-atmosphere-land system on diurnal to interannual timescales. - PowerPoint PPT PresentationTRANSCRIPT
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VOCAL
VAMOS Ocean – Cloud – Atmosphere - Land study
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VOCAL VOCAL THEMETHEME
The theme of VOCAL is to better understand and simulate how marine boundary layer cloud systems surrounding the Americas interact with the coupled ocean-atmosphere-land system on diurnal to interannual timescales.
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VOCAL Scientific IssuesVOCAL Scientific Issues
• On what time and space scales does continental heating/mechanical forcing impact boundary layer cloud/radiative forcing?
• How sensitive is the overall tropical circulation and ENSO to variations of Eastern Pacific cloud topped boundary layer properties and why?
• What are dominant S/I feedbacks among Sc clouds, surface winds, upwelling, coastal currents and SST in E Pacific?
• Does natural and anthropogenic aerosol variability significantly modulate the Sc?
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VOCAL STRATEGIESVOCAL STRATEGIES
• Global and mesoscale model evaluation and improvement (e.g parameterization development) using multiscale data sets.
• Model sensitivity studies to refine hypotheses and target observations.
• Science by synthesis/use of existing data sets, enhancement through targeted instrument procurement, algorithm evaluation and development, and enhanced observation periods.
• Co-ordination with oceanographic, aerosol, cloud process communities, including CLIVAR CPT, CLOUDSAT, etc.
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Progress/hypothesis generation
• Cloud microphysics/drizzle (polynyas)• Diurnal cycle (role of Andes, Sc dynamics)• Role of Andes/flow blocking in influencing Sc.• WHOI buoy/ocean energy budget• Interest in coastal oceanography of region,
including O-A interactions thru trapped coastal (e.g. Kelvin) waves.
• Implementation of some VPM5 plans
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Arica
Lima
San Felix I.
WHOI buoy
Galapagos I.
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RecommendationsRecommendations• Major continuing efforts in diagnostic,
sensitivity, parameterization studies of SE Pac stratocumulus and variability based on past field studies, satellite/model products, and observational enhancements.
• Add an ocean diagnostic study component based on ARGO/ODA, cruises, WHOI buoy aimed at better understanding of ocean upwelling/lateral heat transport processes and their reln. to atmospheric variability.
• Global atm./coupled, mesoscale atm., and regional ocean modeling.
• VOCAL ‘radiator fin’ coupled O-A-L expt. (Oct 06)
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• Augment San Felix Island instrumentation with wind profiler, radiation, microwave LWP, and aerosol sampler.
• NOAA/ETL sfc/remote sensing instrumentation on Pacific and Atlantic buoy maintenance cruises, as well as in RICO.
• Develop a VOCAL data set through a distributed satellite/model/in situ data archive maintained by JOSS. Archive ECMWF and NCEP hi-res column data at WHOI buoy, SFI in co-ordination with CEOP.
• Coordinate with proposed US CLIVAR cloud-climate sensitivity “climate process team” to feed into coupled model development.
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VEPIC TimelineVEPIC Timeline
Modeling, Modeling, empirical, empirical,
and and satellite satellite studiesstudies
2003-2010 diagnostic/modeling work 2003 ETL-enhanced cruises SFI profiler VEPIC data archive2004/11 Cloudsat2005/01 RICO2006/10 Radiator expt.
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Diurnal subsidence wave
Cld microphys. gradient
Ocn heat transport
Coastal jet
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Cloud/drizzle/aerosol interactions
Further offshore, usually larger cloud drop radius
• Why? More aerosol near the coast? Pollution? Ocean productivity, DNS? Salt/wind?
• How does this feedback on mean Sc albedo? Vertical PBL structure?
Science Issues
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OCEAN (1)
• Ekman .vs. eddy heat transport to the west .vs. air-sea interaction
• Vertical mixing at buoy: role of “sagging trades”, comparison with ocean GCMs
• Horizontal extent of nutrients and relation to offshore transport mechanisms
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OCEAN (2)
• Space/time nature of eddy heat transport offshore
• Vertical ocean (and atmosphere) cross-section along a latitude line
• Regional ocean modeling of 1500 km nearest South American coast
• Coastal wind jet and relation with coastal upwelling and clouds
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CLOUD-PBL DYNAMICS
• Space/time nature of eddy heat transport offshore
• Vertical ocean (and atmosphere) cross-section along a latitude line
• Regional ocean modeling of 1500 km nearest South American coast
• Coastal wind jet and relation with coastal upwelling and clouds
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COUPLED ISSUES
• Seasonal cycle of SST
• Continental influence on long timescales
• Cloud feedbacks on ENSO
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IMPLEMENTATION (1)
• San Felix (Rene, Bruce, Bob):
Now: Met., ceilometer (funded 1,5y), SST
Plan: Drizzle detection, sonic
Need: Profile ($20K+), radiation, aerosols
Cloud radar (?)
• RH Brown (or other US ship, Chris Fairall)
Covered already by PACS/other NOAA (250K/y)
Student for analysis (Bretherton/Student, 100k/y)
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IMPLEMENTATION (2)
• RICO/trade Cu: (Graciela Raga, aerosol)
• Satellite observations– JOSS: Coordinate sat. obs. for RICO site– Diagnostic studies, analysis, post-processing
• SCM/LES of diurnal cycle/drizzle in Scu
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IMPLEMENTATION (3)
• Mesoscale modeling:UCH (Rene et al.), synoptic scale/diurnal
variability, parameterization, connection to Andes heating.
• Global modeling:
UCLA/UR-Uruguay: mean circulation, ENSO feedbacks, interaction with orography on seasonal timescale.
CAM-UW: PBL
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IMPLEMENTATION (4)
• Ocean diagnostic studies:– Ken T., Bob W., Ted Strub, Pilar C.– O. Pizarro, A. Miller– Ocean data assimilation, ECCO .vs. buoy– Horizontal heat transport via eddies
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IMPLEMENTATION (5)
• Ocean regional modeling– Patrick M. (France), coastal E.P, Bibliography– Oscar Pizarro’s colleague @ Concepcion– Pablo Lagos (Princeton ocean model)– Art Miller (Scripps)
• CPT
• Field Experiment “SE Pacific Radiator” (Oct. 06)
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• Physical processes that contribute to the circulation whose predictability we are trying to assess.