FineScale Numerical Simulations of a ClearAir Turbulence CAT Event: GulfStream Forcing, Convection, - PowerPoint PPT Presentation

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FineScale Numerical Simulations of a ClearAir Turbulence CAT Event: GulfStream Forcing, Convection,

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z = 400 m above 1 km up to 30 km (80) ... z = 400 m (80) D2: = 3 km (266 266) z = 200 m (128) D3: = 1 km (386 x 386) z = 200 m (124) ... – PowerPoint PPT presentation

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Title: FineScale Numerical Simulations of a ClearAir Turbulence CAT Event: GulfStream Forcing, Convection,


1
Fine-Scale Numerical Simulations of a Clear-Air
Turbulence (CAT) EventGulf-Stream Forcing,
Convection, and Wave BreakingHsiao-ming Hsu,
William Hall, Todd Lane, John Murray, Rival
Plougonven, Melvyn Shapiro, and Robert Sharman
  • Objectives
  • To understand physical processes of this CAT
    event by utilizing multiscale numerical models
    with their nesting capabilities, in conjunction
    with available observations
  • To identify possible scale interactions
  • To investigate future THORPEX or similar cases

2
THORPEX/ATReC (Dec 06, 2003 )
VIS 4 km
VIS 1 km
WV 4 km
IR 4 km
3
Severe encounter
13.5 km
4
SST
5
  • Use triply nested simulations with COAMPS
    atmospheric model initialized and assimilated
    with NOGAPS analysis
  • D1 ? 81 km (77 67)
  • D2 ? 27 km (163 139)
  • D3 ? 9 km (265 x 214)
  • ?z 400 m above 1 km up to 30 km (80)
  • Use multi-nested simulations with the Clark-Hall
    model (MPI version)
  • D1 ? 9 km (178 178)
  • ?z 400 m (80)
  • D2 ? 3 km (266 266)
  • ?z 200 m (128)
  • D3 ? 1 km (386 x 386)
  • ?z 200 m (124)

G-IV dropsondes
6
GS
7
NW-SE
W-E
SW-NE
8
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9
9 km
13 km
16 km
15 km
10
W
?
qr
qc
11
W
?
qc
qr
12
W
?
qc
qr
13
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14
Remarks
  • Identifying and investigating multiscale features
    and their scale interactions from observations
    and numerical simulations
  • Understanding stratosphere-troposphere exchange
    (O3, WV, PV..)
  • Using spectral and wavelet analyses to quantify
    the success and discrepancy of parameterizations
    of contributions from fine structures which exist
    in observations and/or in fine-resolution
    simulations, in both time and space

15
Multiscale Nested Modeling
  • To test WRF (ARW, NMM, and COAMPS) capability by
    using its horizontal nesting strategy and
    inputting different large-scale analysis or model
    data for higher altitudes
  • To continue the vertical nesting utility of
    Clark/Hall model for fine structures, in addition
    to the more common horizontal nesting
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