CAL/VAL ACTIVITIES IN ROSHYDROMET. GSICS Executive Panel 14, Tokyo, 15 July. 2013

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1 CAL/VAL ACTIVITIES IN ROSHYDROMET GSICS Executive Panel 14, Tokyo, 15 July. 2013

2 Future CAL/VAL system deployment in Roshydromet Roshydromet has started the deployment of ground-based calibration/validation system for satellite data and L2 products in frame of Russian Federal Space Program The system should include several CAL/VAL facilities based on Roshydromet observation network as well as on the measurement sites of other institutions, such as Russian Academy of Sciences (RAS), Saint Petersburg State University etc. An aircraft owned by Roshydromet is planned to be utilized in the future. Slide: 1

3 Ground-based Measurements for CAL/VAL (at Petergof-Voeikovo, near Saint-Petersburg) 1. Measurements of the total column (TC) and vertical profiles of more than 20 gases the spectroscopy of the direct solar IR radiation with a high spectral resolution. 2. Measurements of О 3 and NO 2 TC DOAS method. 3. Microwave sounding of ozone profiles. 4. Microwave sounding of temperature, humidity profiles and the cloud water content (0 15 km). 5. Measurements of aerosol optical depth (AERONET). 6. Lidar aerosol sounding. 7. Measurements of near-surface concentrations of green-house and pollutant gases. 8. Standard meteorological observations at weather station and actinometrical observations (direct solar, total, diffused radiations, radiation budget). Slide: 2

4 Ground-based Measurements for CAL/VAL 9. Radio-sounding (vertical temperature profiles of the atmosphere, pressure, humidity, wind speed and direction). 10. Meteorological radar observations of clouds and severe weather events. 11. Microwave measurements at λ = 1.4 cm and λ = 0.8 cm for the atmospheric water vapour and cloud liquid water content estimation. 12. Observations of the total ozone column and UV-radiation. 13. Total column measurements of greenhouse gases (CH 4, CO 2 ). etc.. Slide: 3

5 CAL/VAL System Overview - main centers (SRC Planeta) - CAL/VAL facilities - Roshydromet Observation stations Slide: 4

6 Zotino Tall Tower Facility (ZOTTO) ZOTTO is located in the center of the Siberian taiga, about 20km west of the Yenisei River and about 600km north of Krasnoyarsk city, Krasnoyarsk region, Siberia. The ZOTTO footprint area (~ 1000 km 2 ) covers mosaic of light, dark and mixed forests and wetlands the most representative ecosystem types in Central Siberia. Slide: 5 SRC Planeta V.Sukachev Institute of Forest of the Siberian Branch of the Russian Academy of Sciences

7 List of Observations at ZOTTO Continuous CO 2 and CH 4 Gas Measurements at 301, 227, 158, 92, 52, and 4 m height Continuous Aerosol Measurements at 301, and 52 m height Continuous CO Measurements at 301, and 52 m height Continuous Ozone, and NO x Measurements at 30 m height Continuous Meteorology Measurements at 301, 227, 158, 92, 52, and 4 m height, and on the ground (Temperature, Wind, Humidity) Biweekly Flask Sampling at 301 m height Various irregular ecosystem measurements O3 & CO total column measurements Regular radiosonde measurements (about 80 km from ZOTTO) Measurement profile Slide: 6

8 Inter-calibration technique for MSU-GS instrument Slide: 7

9 ELECTRO-L L General Design Three-axis high-precision stabilization In-orbit mass kg Payload mass kg Lifetime - 10 years Longitude - 76E Data dissemination format - HRIT/LRIT Image repeat cycle 30/15 min Mission objectives Operational observation of the atmosphere and the Earth surface (MSU-GS) Heliogeophysical measurements Maintaining Data Collection System and COSPAS/SARSAT Service Slide: 8

10 MSU-GS BasicB Performance Characteristics Number of channels VIS IR Spectral range at half maximum of spectral response function (µm) ; ; ; ; ; ; ; ; ; Image frame (deg x deg) 20 ± 0.5 x 20 ± 0.5 HRIT ground resolution in subsatellite point (km) 1.0 (VIS); 4.0 (IR) Slide: 9 S/N ratio for VIS channels 200 NE T at 300K (K) in the band µm in the band µm in the band µm Power (W) 150 Weight (kg) 88 Lifetime of basic and reserve units (years) 10

11 MSU-GS 9 channel ( mkm) Slide: 10

12 Slide: 11 GEO-to-GEO IR corrections

13 Intrumental Response Functions of MSU-GS & SEVIRI Slide: 12

14 Simulated spectra for different atmosphere models Summer Winter Slide: 13

15 Adjustment of MSU channels to SEVIRI using effective wavelength 9 channel 10 channel BT λ = F( λ eff, R λ S( λ) dλ), where N = S( λ) N λ 1 λ λ 1 dλ Slide: 14

16 SEVIRI & MSU T B fields with averaging Comparison results: Data, 2012 T SEV-MSU, K StDev, K This can be explained by the different instruments calibration. To adjust MSU-GS data there should be a bias of 3.0K to be added. Slide: 15

17 GEO-to-LEO IR corrections Inter-calibration involves the comparison of observations from one monitored instrument to another, defined as the reference instrument. The monitored instrument is imaging radiometer MSU-GS on board Electro-L geostationary satellite (IR channels). The reference instrument is AIRS/Aqua. To develop GEO-to-LEO inter-calibration tool, some preliminary experiments have been carried out with inter-calibration of SEVIRI channel 9 and AIRS data. In order to minimize the influence of zenith angles difference the AIRS pixels have been selected with zenith angles close to zero. The criterion of suitable SEVIRI pixels choice is cos θ > 0.995, where θ is zenith angle. To eliminate uncertainties related to cloud contaminated data both measured and simulated (AIRS-based) brightness temperatures TB in SEVIRI channel 9 have been sorted from minimum to maximum values. All the minimum and maximum values were discarded, so there were only ones utilised that represents cloud-free measurements. Similar technique was used for the MSU-GS - AIRS intercalibration. Slide: 16

18 AIRS and SEVIRI Brightness Temperatures in Increasing Order Τb=0.2 K :35 UTC Slide: 17

19 AIRS and MSU-GS Brightness Temperatures in Increasing Order Τb=2.2 K :30 UTC Slide: 18

20 Proposed scheme of LEO-GEO-LEO IR channels intercalibration IASI calculated spectra, IRFS-2 calculated spectra, δν=0.25cm -1 δν=0.7cm -1 IASI SEVIRI IRFS-2 For SEVIRI channel #9 For SEVIRI channel #10 T, K

21 THANKS