Improved Simulations of Clouds and Precipitation Using WRF-GSI
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Improved Simulations of Clouds and Precipitation Using WRF-GSI Zhengqing Ye and Zhijin Li NASA-JPL/UCLA June , 2011
description
Improved Simulations of Clouds and Precipitation Using WRF-GSI. Zhengqing Ye and Zhijin Li NASA-JPL/UCLA June , 2011. Outline. Data assimilation and a multi-scale scheme WRF and data assimilation in March, 2000 Data assimilation in June, 2007 Summary. - PowerPoint PPT Presentation
Transcript of Improved Simulations of Clouds and Precipitation Using WRF-GSI
Improved Simulations of Clouds and Precipitation Using WRF-GSI
Zhengqing Ye and Zhijin LiNASA-JPL/UCLA
June , 2011
Outline
1. Data assimilation and a multi-scale scheme
2. WRF and data assimilation in March, 2000
3. Data assimilation in June, 2007
4. Summary
Multi-Scale 3DVAR:Multi-Scale Background Error Covariance
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SL
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21min
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21min
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11
yxHRHHByxHxBxJ
yxHRHHByxHxBxJ
ST
LT
SSSTSx
LT
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LLLTLx
S
L
Background
Multi-scale DA
SL
TSL
BBB
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0
(Li et al., 2011, QJRMS)
WRF and Data Assimilation Configuration:Case during the March 2000 Cloud IOP
• The North American Regional Reanalysis (NARR) : Initialization and the lateral boundaries
• Observations: SONDE profiles and surface observations
18KM
6KM
2KM
Improved Meteorological Fields
RMSEs
Mean Profiles
Impact of ARM and Satellite DataCase during the June 2007 CLASIC IOP
• Conventional data• ARM (Atmospheric Radiation Measurement) data• Satellite data:
amsua: Radiance (Brightness Temp) from NOAA 16, 17, 18, metop-a amsub: NOAA 15,16,17 hirs3: NOAA 16, 17 airs : NASA AQUA mhs : NOAA 18, metop-a
Conventional, ARM and Satellite Data points
Conventional & ARM data (2007061300) Satellite data (2007060900)
NEXRAD Reflectivity: Meso-Scale Convective System (MCS): June 14, 2007
UTC 00:00 UTC 03:00
UTC 06:00 UTC 09:00
Improved Reflectivity: UTC 06, 14 June, 2007
NO DA
DA
Simulated 900 hPa Reflectivity
Improved Simulation of A Meso-scale Convective System
UTC 12, 06-13-2007-------------UTC 00, 06-14-------------UTC 12, 06-14
Observed 6-hour Precipitation
Improved Precipitation: UTC 18-24, 13 June, 2007
NO DA
DA
Observation
Improved Precipitation: UTC 00-06, 14 June, 2007
NO DA
DA
Observation
Summary
WRF-GSI system can improve the simulation for most of 3D meteorological fields (u, v, T, q profiles)
Clouds and precipitation simulation can also be improved in WRF -GSI data assimilation system.
