1. Progress on FY-3 IR GSICS inter-calibration system
Na Xu, Hanlie Xu, Xiuqing Hu,

2. Outline
Brief introduction of FY-3 IR GSICS system
IR Bias monitoring and correction of FY-3
Future Prospects

3. Current Status of FY-3 IR GSICS
Monitor
Sensor
Reference
Collocation & Correction Products(Under building)
Graphic Products
(Under building)
FY-3A&B/ MERSI&VIRR
Metop/IASI (Op.)
AQUA/AIRS (Op.)
NPP/CrIS (Demo)
Collocation Samples
Inter-calibration Coefficients
NRTC and RAC in txt (Plan to generate the GSICS standard format)
Monthly Regression (RAD~RAD and TBB~TBB)
Monthly Scatter of TBB Bias
Time Sequence of TBB Bias
FY-3C/MERSI
&VIRR&IRAS
NPP/CrIS (Op.)
SNO prediction results of FY-3C vs. NPP, and FY-3C vs. Metop-A on March 18,2017
FY-3C vs. NPP
FY-3C vs. Metop-A
Track prediction system could provide after 14 days SNO prediction results;
The reference satellites included NPP, METOP-A, METOP-B, AQUA, TERRA,OCO, GOSAT…
The monitor satellites included FY-3, Tansat and other Chinese satellites

4. IR Calibration Bias of FY-3
Based on LEO-LEO SNO intercalibration method, IR calibration biases of FY-3A&B VIRR and MERSI are assessed
Spatial distributions of cross points
FY-3B~METOP-A
Collocation criteria:
Observation time difference < 300s
Spacial Distance <1km
geometry difference |cos(FY_zen)/cos(REF_zen)-1| <1%
Environment uniformity check RSTD (FY3 in ENV_BOX) < 0.005
Temporal distributions of cross points

5. Time series of TBB biases for FY-3 VIRR Window channels vs IASI/CrIS
GSICS Contributions to FY-3 IR calibration
FY3A: seasonal oscillation;biases between channels a disagreement
FY3B: bias<1 K; less seasonal oscillation
Intercalibration can reveal the variation of calibration bias , and improve OBC based on parameters modification
FY3C: bias0.5 K; less seasonal oscillation ; more agreement of biases between channels
Time series of TBB biases for FY-3 VIRR Window channels vs IASI/CrIS

6. Long-term Calibration Tracking FY-3C
Using NPP.CrIS and Metop-A/IASI as reference sensors, the FY-3 GSICS realized long-term calibration tracking of MERSI and VIRR.
FY-3C/MERSI
FY-3C/VIRR

7. Future Prospects
Completing Correction Products of FY-3/VIRR (according to GSICS standard format and products of FY-2);
Completing the graphic products on FY-3 IR GSICS website;
Adding new inter-calibration techniques in FY-3 IR GSICS system, e.g., accurate collocation, collocation between two high spatial resolution.
FY-3D/HIRAS vs. FY-3D/MERSI II
FY-3D/HIRAS vs. Metop/IASI & NPP/CrIS
Using accurate collocation of two sensors on the same platform;
Considering HIRAS’s FOV projection on the earth;
Spatial transformation and collocation of two high spatial resolution sensor’s measurements ;

8. Thanks for your attention!