An Overview of the NCEP Eta Model
Presented by
Tom Black
at the
COMET COMAP Symposium 00-1

12/14/99

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Table of Contents

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Outline

Domain

Eta Domains Past & Present

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32km Domain

Topography w/ Water Points

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What is 3D-VAR?

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3D-VAR vs. OI

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Split Explicit Integration: Dynamics

Split Explicit Integration: Dynamics

Split Explicit Integration: Physics

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One-way Boundary Conditions

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Betts-Miller Reference Temperature Profile

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Shallow Convection

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Cloud Top Pressure

Cloud Top Temperature

Cloud Base Height

850mb Cloud Water (kg/kg)

850mb Cloud Ice (kg/kg)

Winter Precipitation Type

Example of precip type

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Impact of Eta degradation

Impact of Eta degradation

Impact of Eta degradation

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Subsets (“tiles”) of 32km grid

Future Directions of Eta Effort with the Class VIII

Cloud Data Assimilation (Zhao et al, 1998, 12th NWP, Phoenix, AZ)

Cloud Data Assimilation

Rainfall Data Assimilation

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22km Domain / Topography

22km CONUS

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Workstation Version

Author: Tom Black

Email: wd22tb@sgi38.wwb.noaa.gov

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