Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and...

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Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner (GFDL, Princeton University) Vaughan Phillips (Princeton University) GCSS WG4 Broomfield, CO October 2003

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Page 1: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs

Leo Donner (GFDL, Princeton University)

Vaughan Phillips (Princeton University)

GCSS WG4 Broomfield, CO October 2003

Page 2: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Motivation

• CSRMs emerging as crucial component of multi-scale modeling framework for AGCMs, aka “superparameterization”

• 2D CSRMs have been employed in pioneering superparameterization studies

• Convective vertical velocities increasingly recognized as important for microphysics and radiation interactions

Page 3: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 4: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 5: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 6: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 7: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 8: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 9: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 10: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 11: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 12: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 13: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

2D

Page 14: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 15: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 16: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 17: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 18: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 19: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 20: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

Page 21: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

2D > 3D SW Reflection: Microphysical Aspects

• Less cloud liquid,cloud ice, and snow in 3D• More graupel in 3D• Behavior holds for GATE, TOGA-COARE, and

ARM A• Precipitating stratiform fractional area less in 3D

in all cases except ARM A 2D(y)• Microphysics linked to convective vertical

velocities, which differ sharply in 2 and 3D

Page 22: Geophysical Fluid Dynamics Laboratory Princeton, New Jersey Convective Vertical Velocities and Microphysics: Contrasts between 2D and 3D CSRMs Leo Donner.

GeophysicalFluidDynamicsLaboratory

Princeton, New Jersey

2D > 3D SW Reflection: Dynamic Aspects

• Cumulus vertical velocities higher in 3D than 2D for GATE, TOGA-COARE, ARM

• Convective mass flux greater in 3D than 2D for GATE and TOGA-COARE, and, for vertical velocities > 5 m s-1, for ARM A

• Stratiform mass flux less in melting layer for GATE, ARM, and TOGA-COARE


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