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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.

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slide1
VOCAL

VAMOS Ocean – Cloud – Atmosphere - Land study

vocal theme
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.

slide3

VOCAL 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 currentsand SST in E Pacific?
  • Does natural and anthropogenic aerosol variability significantly modulate the Sc?
slide4

VOCAL 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.
progress hypothesis generation
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
slide6

Galapagos I.

Lima

Arica

WHOI buoy

San Felix I.

slide7

Recommendations

  • 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)
slide8
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.
slide9

VEPIC Timeline

  • 2003-2010
  • diagnostic/modeling work 2003 ETL-enhanced cruises
  • SFI profiler
  • VEPIC data archive
  • 2004/11 Cloudsat
  • 2005/01 RICO
  • 2006/10 Radiator expt.

Modeling, empirical, and satellite studies

slide11

Diurnal subsidence wave

Cld microphys. gradient

Coastal jet

Ocn heat transport

slide12

Science Issues

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?
ocean 1
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
ocean 2
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
cloud pbl dynamics
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
coupled issues
COUPLED ISSUES
  • Seasonal cycle of SST
  • Continental influence on long timescales
  • Cloud feedbacks on ENSO
implementation 1
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)

implementation 2
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
implementation 3
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

implementation 4
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
implementation 5
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)
slide23
Physical processes that contribute to the circulation whose predictability we are trying to assess.
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