Observations Processing for CMA Global Reanalysis (CRA-40) Lipeng Jiang1, Zhiquan Liu1,2, Chunxiang Shi1 , Zijiang Zhou1, Tao Zhang1, Jie Liao1,

Zhisen Zhang1, Minyan Wang1, Shuang Yao1, Lijuan Cao1, Kaixi Hu1, Zhe Chen1, Hui Jiang1 and Qi Zhao1

1. National Meteorological Information Center(NMIC), China Meteorological Administration(CMA), Beijing, China

2. National Center for Atmospheric Research(NCAR), USA

CMA started global reanalysis efforts at the end of 2013 to produce CMA 40-year

atmospheric reanalysis (CRA-40) extending back to 1979. In the past 4 years, the

reanalysis system (as shown in Fig. 1) was build based on NCEP GSM model and

community GSI, and 10-years CRA interim product with the spatial resolution of

approximately 34km(T574) was produced. This poster emphases on the processing

of observations for this interim product.

1. Introduction

Integration:

Radiosonde & SYNOP: CFSR/GDAS database + more Chinese observations;

Aircraft: from CFSR, Met Office and NMIC

Satellite retrievals: reprocessed AMV & reprocessed sea surface wind;

Satellite radiances: from CFSR/GDAS observation database;

GPS-RO: CFSR + GTS;

Fig. 1 CMA Reanalysis System

2. Obs. Integration, QC and Evaluation

Quality Control:

Conventional observations go through the online CQC procedure and apply GSI

internal VarQC;

Satellite observations apply GSI internal QC procedure.

Pre-Evaluation Toolkit (PET):

Makes use of Era-Interim reanalysis fields by interfacing them to GSI in order to

compute observation departures for the purpose of benchmarking.

The prepbufr files from the NCEP CFSR reanalysis have also been used with the

PET in order to compare with the NMIC-processed observations.

NMIC-processed OBS

ERA-Interim

Reanalysis

Pre-Evaluation

Toolkit Departure files

NCEP CFSR OBS

Fig. 2 GSI based Observations Pre-Evaluation Toolkit (PET)

3. Observations Ingested in CRA-Interim

Fig. 3 CRA-Interim Observations Timeline

Fig. 4 Comparison of global mean surface pressure statistics Fig. 7 Comparison of 10-years global mean radiosonde T&Q statistics

Fig. 5 Integrated aircraft observations Fig. 6 Reprocessed AMVs

4. Summary and Plan

10-years global integrated observations were able to be ingested by GFS/GSI-3DVar;

O-B and O-A statistics were compared with O-R(OBS minus ERA-Interim reanalysis).

Finish the processing of 40-years global observations

Start the production of 40-year CMA reanalysis using GSI-Hybrid/EnKF

technique next year; Lipeng Jiang, Nov., 2017, ICR5 in Roma (Jianglp@cma.gov.cn)