China Meteorological Administration National Satellite Meteorological Center Training Course on Satellite Meteorology 2012 ） Oct.22-Nov.2 Beijing China.

China Meteorological AdministrationNational Satellite Meteorological

Center

Training Course on Satellite Meteorology 2012 ） Oct.22-Nov.2 Beijing China

CMA Working Papers for CGMS-41

Agenda Item CMA-WP

II/2 04 CMA activities on SCOPE-Nowcasting

II/3 05 CMA activities on GSICS

II/6 06 CMA progress on AMV inter-comparison study

II/9 07 Validation of FY-3B Sea Surface Temperature

List of CMA Working Papers for CGMS-41 Workgroup II

CMA Activities on GSICS

CGMS-41, CMA-WP-05 Prepared by CMA Agenda Item: II/3 Discussed in WGII

CMA-WP-05 informs CGMS of the progress of CMA GPRC last year in the geostationary imagery calibration monitoring based on operational GEO-LEO IR inter-calibration for FY-2D/2E/2Fsatellites. Especially, besides providing calibration correction, GSICS plays a key role in monitoring the onboard blackbody calibration, which has recently become operational with the help of lunar observation. LEO-LEO inter-calibration evaluation for FY-3A/B IR bands using AIRS and IASI shows calibration bias and non-linearity of their optical sensors (MERSI/VIRR/IRAS). Calibration tracking and inter-calibration based on Deep Convective Cloud (DCC) are being implemented for FY-3A/MERSI and FY-2/VISSR. The Instrument Performance Monitoring for the FY sensors is being established based on telemetry and engineering data and displayed near real-time on the CMA GSICS website (http://gsics.nsmc.cma.gov.cn).

Introduction

The CMA GSICS Processing and Research Center (GPRC) was established in 2009. Actions have been taken in response to CGMS recommendations to establish the near real-time monitoring for the instrument performance, to provide explanation for significant discrepancies in satellite inter-calibration, and to generate long-term satellite-based climatology.Some progresses have been made with regard to the calibration of Fengyun satellite sensors in implementing GSICS actions since CGMS-36.

FY-2 operational calibration and GSICS Implementation

Before 2005: The FY-2A/2B IR calibration based on Vicarious Calibration using Qinghai Lake had no real-time/near real-time operational calibration.

2005: FY-2C is operationally calibrated based on inter-calibration using AVHRR and HIRS since 2005.

2007: FY-2D is operationally calibrated based on inter-calibration using AVHRR and HIRS.

2009: FY-2C/2D GSICS IR calibration experiment using the AIRS and IASI since Oct., 2009.Development of onboard half-optical BB calibration model based on GSICS reference standard.

FY-2 operational calibration and GSICS Implementation

2011: FY-2D/2E operational calibration monitoring test using GSICS IR calibration since May,2011.

2012: FY-2E GSICS GEO-LEO IASI results has become the operational input of L1 calibration LUT instead of AVHRR/HIRS.FY-2F operational calibration has been based on onboard blackbody and moon observation with diurnal change since July, 2012.

2013: All FY-2 serials satellites will be calibrated using on-board blackbody and these operational calibration. GSICS calibration is still used to monitoring the calibration bias using AIRS/IASI or CrIS.

FY-2D/2E/VISSR calibration bias with respect to Aqua/AIRS reference. The bias of IR1,IR2 and IR3 are shown by red, green, and blue points in 290 K (IR1 and IR2) or 250K (IR3) reference scene.

FY-3 GSICS Activity

Collocation map of VIRR (bottom) and AIRS (overlay Grid) and SNO Cross Point between FY-3A and Aqua orbit

FY-3B IRAS inter-calibration

650 700 750 800 850 900 950 1000 1050 11000

0.2

0.4

0.6

0.8

1

650 700 750 800 850 900 950 1000 1050 1100200

250

300

1200 1400 1600 1800 2000 2200 2400 2600 28000

0.2

0.4

0.6

0.8

1

1200 1400 1600 1800 2000 2200 2400 2600 2800200

250

300

1 2 3 4 5 6 7

8 910

11 12 13

14

1516

1718

1920

0 2 4 6 8 10 12 14 16 18 20-4

-3

-2

-1

0

1

2

3

4

channel number

TB

B B

ia

s / K 2012-12

VIRR inter-calibration

FY-3A/VIRR band 4 and 5 calibration bias FY-3B/VIRR band 4 and 5 calibration bias

CMA GSICS website

The new CMA GPRC website (http://gsics.nsmc.cma.gov.cn ) is opened in March 2013. All information about the FY satellite sensors and calibration can be obtained from this website.

The End

Thanks for your attention