New generation of multi-scale NWP system (GRAPES): general scientific design

Chen, Dehui; Jishan, Xue; Yang, Xianyi; Zhang, Hongliang; Shen, Xueshun; Jiang-lin, HU; Wang, Yu; Li, Ji; Jia-bin, Chen

doi:10.1007/s11434-008-0494-z

Cited by 157 publications

(86 citation statements)

References 31 publications

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“…The aim of this study is to assimilate, for the first time, FY-3C MWTS-2 radiance data into the Global and Regional Assimilation and PrEdiction System (GRAPES) of China Meteorological Administration (CMA) Chen, 2008, Xue et al, 2008). In this research, the observation processing and quality control (QC) for FY-3C radiance will be developed.…”

Section: Introductionmentioning

confidence: 99%

Direct assimilation of Chinese FY-3C Microwave Temperature Sounder-2 radiances in the global GRAPES system

Liu

2016

Atmos. Meas. Tech.

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Abstract. FengYun-3C (FY-3C) is an operational polarorbiting satellite carrying the new-generation microwave sounding instruments in China. This paper describes the assimilation of the FY-3C Microwave Temperature Sounder-2 (MWTS-2) radiances in the Global and Regional Assimilation and PrEdiction System (GRAPES) of China Meteorological Administration. A quality control (QC) procedure for the assimilation of MWTS-2 radiance is proposed. Extensive monitoring before assimilation shows that MWTS-2 observations exhibit a clear striping pattern. A technique combining principal component analysis (PCA) and ensemble empirical mode decomposition (EEMD) is applied to the observations to remove the striping noise. Cloudy field-of-views (FOVs) are identified by applying the Visible and InfrarRed Radiometer (VIRR) cloud fraction threshold of 76 %. Other QC steps are conducted in the follow order: (i) coastal FOVs are removed, (ii) eight outmost FOVs are not used, (iii) channel 5 data over sea ice and land are not used, (iv) channel 6 observations are not used if the terrain altitudes are higher than 500 m, and (v) outliers with large differences between observations and model simulations are removed. Approximately 83, 75, 40, and 40 % of the observations are removed by the proposed QC for channels 5-8, respectively. After QC, the global biases and standard deviations are reduced significantly. The assimilation of the MWTS-2 radiances shows a positive impact when the control experiment assimilates only conventional observations. The experiments also show that the analysis and forecast errors are slightly reduced when the striping noise is removed from the observations. The quality control scheme of extracting the striping noise may contribute to the analysis and forecast accuracy.

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Section: Introductionmentioning

confidence: 99%

Direct assimilation of Chinese FY-3C Microwave Temperature Sounder-2 radiances in the global GRAPES system

Liu

2016

Atmos. Meas. Tech.

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“…The CMA new generation of weather forecasting model GRAPES is a fully compressible non-hydrostatic weather model system which uses a semi-implicit and semiLagrangian discretization scheme Xu et al, 2008;Chen et al, 2008). It uses an Arakawa-C staggered grid and the central finite-difference approach of second-order accuracy in horizontal coordination, a nonhydrostatic approximation method together with the staggered approach of Charney-Phillips to improve the accuracy of vertical pressure gradients and a semi-implicit and semiLagrangian scheme for temporal and advection discretion.…”

Section: Grapes/cuace Systemmentioning

confidence: 99%

Improving aerosol interaction with clouds and precipitation in a regional chemical weather modeling system

et al. 2016

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Abstract.A comprehensive aerosol-cloud-precipitation interaction (ACI) scheme has been developed under a China Meteorological Administration (CMA) chemical weather modeling system, GRAPES/CUACE (Global/Regional Assimilation and PrEdiction System, CMA Unified Atmospheric Chemistry Environment). Calculated by a sectional aerosol activation scheme based on the information of size and mass from CUACE and the thermal-dynamic and humid states from the weather model GRAPES at each time step, the cloud condensation nuclei (CCN) are interactively fed online into a two-moment cloud scheme (WRF DoubleMoment 6-class scheme -WDM6) and a convective parameterization to drive cloud physics and precipitation formation processes. The modeling system has been applied to study the ACI for January 2013 when several persistent haze-fog events and eight precipitation events occurred.The results show that aerosols that interact with the WDM6 in GRAPES/CUACE obviously increase the total cloud water, liquid water content, and cloud droplet number concentrations, while decreasing the mean diameters of cloud droplets with varying magnitudes of the changes in each case and region. These interactive microphysical properties of clouds improve the calculation of their collection growth rates in some regions and hence the precipitation rate and distributions in the model, showing 24 to 48 % enhancements of threat score for 6 h precipitation in almost all regions. The aerosols that interact with the WDM6 also reduce the regional mean bias of temperature by 3 • C during certain precipitation events, but the monthly means bias is only reduced by about 0.3 • C.

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“…The original experimental system of the GRAPES data assimilation and forecast model with regional and global configurations was set up in 2005 (Xue, 2006;Chen et al, 2008). Since 2007, 1-year period global pre-operational trials have been conducted to evaluate the model performance every year.…”

Section: Early Pre-operational Trialsmentioning

confidence: 99%

Assimilation of GNSS radio occultation observations in GRAPES

Liu

Jishan

2014

Atmos. Meas. Tech.

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Abstract. This paper reviews the development of the global navigation satellite system (GNSS) radio occultation (RO) observations assimilation in the Global/Regional Assimilation and PrEdiction System (GRAPES) of China Meteorological Administration, including the choice of data to assimilate, the data quality control, the observation operator, the tuning of observation error, and the results of the observation impact experiments. The results indicate that RO data have a significantly positive effect on analysis and forecast at all ranges in GRAPES, not only in the Southern Hemisphere where conventional observations are lacking but also in the Northern Hemisphere where data are rich. It is noted that a relatively simple assimilation and forecast system in which only the conventional and RO observation are assimilated still has analysis and forecast skill even after nine months integration, and the analysis difference between both hemispheres is gradually reduced with height when compared with NCEP (National Centers for Environmental Prediction) analyses. Finally, as a result of the new on-board payload of the Chinese FengYun-3 (FY-3) satellites, the research status of the RO of FY-3 satellites is also presented.

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New generation of multi-scale NWP system (GRAPES): general scientific design

Cited by 157 publications

References 31 publications

Direct assimilation of Chinese FY-3C Microwave Temperature Sounder-2 radiances in the global GRAPES system

Direct assimilation of Chinese FY-3C Microwave Temperature Sounder-2 radiances in the global GRAPES system

Improving aerosol interaction with clouds and precipitation in a regional chemical weather modeling system

Assimilation of GNSS radio occultation observations in GRAPES

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