cma global reanalysis (cra- 40): status and plans
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CMA Global Reanalysis (CRA-40): Status and Plans
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Zhiquan (Jake) LiuChunxiang Shi, Zijiang Zhou, Lipeng Jiang, Xiao Liang,Tao Zhang, Jie Liao, Jingwei Liu, Mingyan Wang, ShuangYao, Zhishen Zhang, Lijuan Cao, Kaixi Hu, Hui Jiang, YaniZhu, Yizhou Yin, Bin Zhao, Dong Si, Chenghu Sun,
and others
5th International Conference on Reanalysis 13-17 Nov. 2017, Rome, Italy
Started in early 2014, led by the National Meteorological Information Center (NMIC) of CMA
Include Atmosphere and Land component
3 other CMA national centers and 3 outside institutes involved- National Meteorological Center (CMA/NMC) - National Satellite Meteorological Center (CMA/NSMC) - National Climate Center (CMA/NCC)- Institute of Atmospheric Physics, Chinese Academy of Sciences (CAS/IAP) - Beijing Normal University (BNU) - Nanjing University of Information Science & Technology (NUIST)
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Background
Goals
Produce 40-year datasets (1979-2018):
– Ingested observations
– Grid products: ~30km, 6 hourly
– Obs. feedback datasets:departure from analysis & background
– Atmospheric Reanalysis uncertainty:from EnKF ensembles
Will then be continuously running in NRT for climate
monitoring
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CMA 40-year Global Reanalysis (CRA-40)
Atmospheric Reanalysis System- Forecast Model: GFS
T574 (~ 34km), 64L, top at ~0.2hPa- Data Assimilation: GSI
3Dvar-FGAT, 6-h time windowVarBC for aircraft T and satellite radiances
Observations (see Poster by Jiang Lipeng)- Radiosondes & SYNOP: CFSR + more Chinese observations- Radiosonde T: applied “raobcore” bias correction- Aircraft data from CFSR, Met Office, and NMIC- Reprocessed AMV, GPS-RO, scatterometer ocean surface wind- Satellite Radiances from CFSR/GDAS observation Dataset
Production (finished middle October!) 2007.1 - 2016.12, 2.5year/stream, 6 months overlap between streams
Separate Land Reanalysis (see Poster by Liang Xiao) Based on NASA LIS and Noah3.3 LSM No soil data assimilation, forcing: SW radiation, precip., surface P/t/q/wind
10-year Interim Product (CRA-Interim)
2006.07
2010.072012.07
2014.07
2008.07
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5 streams
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Comparison of CRA-Interim and ERA-Interim against Radiosonde T
RMSE of ERA-Interim
RMSE of OMA RMSE of OMB
Smaller RMSE than ERA-Interim against radiosonde temperature
2014 heat wave event (July 4 – August 10)
Southeast of China and Sichuan Basin
ERA misses high T in Sichuan basin
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CRA-Interim/CFSR/JRA55 minus ERA-Interim
Global T Mean Global RH Mean
Global U MeanSouthern Hemi.Z Mean
Problem
Re-run exp. with CFSR’s GPSRO, compare to ERA5
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Mean 500 hPa Z difference w.r.t. ERA5 (Units: gpm)
CFSR’sGPSRO
ReprocessedGPSRO “Impact height” is
different betweenCFSR data andUCAR/COSMICreprocessed data
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Re-run exp. with CFSR’s GPSRO, compare to ERA5
Height-latitude distribution of U-wind and T mean difference between
ERA5 and other reanalyses
• Currently re-running 5 streams by replacing reprocessed GPSRO by CFSR’s GPSRO data – should finish in Feb. 2018
• Evaluate CRA-Interim and release in 2nd half of 2018
• Prepare for CRA-40 production- CMA new HPC expected in 2018, 8 Pflops,- GSI-4DEnVar/EnKF & GFS T574 or higher- Observation processing/pre-evaluation
• Expect to complete CRA-40 by 2020
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Future Plan