CMA future prospects for radio occultation
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1 CMA future prospects for radio occultation Peng Zhang NSMC/CMA Presented to CGMS-[43] [Plenary & Working Group II] session, agenda item [5]
2 GNOS--Global 1. FY3C/GNOS overview lobal Navigation Satellite System Occultation Sounder First Launched on Sep.23 rd, 213 Picture of GNOS GNOS instrument parameters Parameters Instrument mass Constellation 7.5kg GPS L1 L2 Beidou B1 B2 Channel number Positioning: 8 Occultation:GPS 6 Beidou 4 Sampling rate Clock stability Content Positioning & Ionosphere occultation: 1Hz Atmosphere occultation: CL 5Hz OL Hz 1-12 (1secAllan) Antenna specification Pseudorange precision Carrier phase precision Atmosphere occultation antenna: Gain: >dbi Antenna field of view: (El ±7.5 Az ±35 ) Positioning & Ionosphere occultation antenna: Gain: -1dBi Antenna field of view: ±6 3cm 2mm
3 2. GNOS Operational Products Products category L1 Excess phase,pod L2a Banding angle, Refractivity, Electron density L2b Temperature, Humidity GNOS data start from June 1st,214 8 Refractivity 8 Density 8 Tp 2 Mois Height / Km Refractivity Height / Km Density(g/m 3 ) x -4 Height / Km Tp(K) Height / Km Mois(g/kg) Occultation date is 2 Otc.213, and the time is 3:22(UTC).Occultation located at E,49.18N, which received signal from GPS14 by GNOS/FY3C. Dissemination ways Web-based service CMACAST GTS
4 Daily Occultation events 8 Number of refractivity profiles per day Nu umber /1/14 /31/14 12/3/14 Blue is GPS (552 times), Red is BDS(184 times) Only shows GNOS/GPS processing stream in operation (GPS parameters from IGS web) About 5 refractivity profiles per day
5 the distribution of radio occultation spots from January 1, 214 to June 3, 214
6 3. Results Validation GNOS/GPS Compare with ECMWF reanalysis GNOS meets the requirement of 2% (STD)below 35km
7 Compare with ECMWF reanalysis Including GNOS/GPS, GNOS/BDS, COSMIC and METOPA/GRAS Exhibiting good agreement with ECMWF in terms of bias Reconfirming the characteristic of non-bias of radio occultation The most excellent sounding height of GNOS is from 5 to 3 kilometers, standard deviation is within1%
8 GNOS/GPS Temperature/Moisture validated with Radiosonde GNOS - 探探 Bias STD 每层层每数 9 N 高高 / Km N W 135 W 9 W 45 W 45 E 9 E 135 E 18 E 45 S 折折折 δn/n [%] GNOS - 探探 12 Bias Bias±STD 数数每层层每数 12 9 S 8 8 高高 / Km 比比 δq [g/kg] 数数
9 4. Data Assimilation into NWP Unified framework for global and regional system, the global version operation since 29. GRAPES forecast model Non-hydrostatic equations Terrain-following coordinate Arakawa-C(horizontal) and Charney Phillips(vertical) grid Model top at 32.5km Resolution.5 x.5. GRAPES-DVar Observations assimilated : conventional data (radiosondes, synops, ships, AMV and aircraft), GNSS RO, MODIS wind, ASCAT wind, radiances(noaa15,16,17,18,19,metop and FY) Incremental digital filter initialization Experiment Setup Control experiment (configuration of global operational system) impact experiments (ctrl+gnos/gps, ctrl+gnos/gps+gnos/bd) Cycling time: 1 st - 3 th, Nonvember, 213
10 Preliminary Forecast Impact Experiment Impact on GRAPES Forecast Accuracy CTRL CTRL+GPS CTRL+GPS+BD ACC scores (the higher the better) for forecast days. GNOS data has an neutral and positive impacts on GRAPES analysis and forecast skill. Number of CS RO data Assimilated per 6 hours in November Number COSMIC GNOS/GPS GNOS/BD Courtesy of Liu yan (NWPC/CMA) Time
11 5. GNOS on FY-3 follow-on FY-3 2 batch to 3 batch Transition 3 yrs 5 yrs 8 yrs Designing lifetime FY-3(3 rd batch) FY-3G FY-3R FY-3(2 nd batch) FY-3E FY-3F FY-3D FY-3(1 st batch) FY-3C FY-3A FY-3B FY-1C/1D AM PM EM Rainfall
12 GNOS Improvement Atmosphere occultation antenna Gain will be improved More RO channels GPS: 6 8 BDS: 4 8 Open loop tracking for B1
13 6. Summary Daily profiles can up to ~5 for GNOS/GPS GNOS/FY-3C shows good data quality during 5 3 km GNOS/F-3C data has an neutral and positive impacts on GRAPES forecast skill. The next instrument of GNOS on FY-3D and follow-on will be improved on antenna gain, channel number and B1 open loop tracking ability Future Work More elaborated experiments on the assimilation of GNOS Promote operation of the occultation data from BDS International Cooperation
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