Progross towards DCC Demo Product-CMA Presented by Lin Chen National Satellite Meteorological Center(NSMC), CMA Email: chenlin@cma.gov.cn Acknowledgements: Sebastien Wagner, Na Xu

Outline Progross towards DCC Demo Product-CMA DCC Seasonal Cycle Analysis Seasonal Cycle of MODIS DCC Seasonal Cycle Model Apply the model to MODIS DCC analysis

Part1:Progress towards DCC Demo Product-CMA CMA has completed the GSICS-DCC operational software for FY2D/E/F/G based on the NASA DCC ATBD.The reference instrument is AQUA/MODIS B1. The software has the function of automatic abstract, counting and plotting results. It is ready to produce the DCC demo product when the product format is decided. Question: Due to the big bias of FY2 operational IR calibration, the FY2 DCC product should be produced after the IR correction.

bias of FY2 operational IR calibration Provided by Xu Na

Main Interfase

Working Process Monitor Working Statue Monitor CPU usage percentage; Storage usage percentage;

Part2: DCC Seasonal Cycle Analysis Using the Gussan filter to remove the high frequency signal of DCC and make it smoother. Using the Aqua/MODIS time period(2004~2009) to build the seasonal cycle model The standard deviation for different year of the same day as the error bar.

Seasonal Cycle of MODIS DCC

Seasonal Model For Globally Data

Seasonal Model For MSG Area

Comparison with MSG DCC model Provided by Sebastien

Apply the model to MODIS DCC analysis GLOBAL MSG

Conclusions CMA is ready to produce the DCC demo product when the product format is decided. DCC seasonal cycle is built based on 6-years MODIS/AQUA B1 data. The model oscillation amplitude is about 0.5% for globally data and 1% for MSG area data both with high point in summer-time and low point in winter-time. when the model is applied to MODIS DCC analysis, it could reduce the STD 20%~30%.

Thanks for your attention!