Report from CMA 17th GSICS Executive Panel, Biot, 2-3 June 2016

Peng Zhang Xiuqing (Scott) HU

(National Satellite Meteorological Center, CMA )

GSICS-EP-17, Biot, 2-3 June 2016 1

Overall agency update from CMA

• Overall satellite planning – FY-3A already exceed its planned lifetime (since 2008) and only three instruments

(MERSI/VIRR/TOU) are still working. Only Chinese local data (HRPT/MPT) is downlinked and global direct broadcasting is turned off.

– FY-3C operational running in June, 2014 and Its data quality and accuracy is largely better than FY-3A/3B.Unfortunely, the power system problem of FY-3C satellite since May 31, 2015 lead to two main sensors (MERSI and MWTS) turning off.

– The Latest FY-2G was launched on December 31, 2014. The commissioning finished in May, 2015. The staylight restriction is better than the previous and its IR calibration is also better and more stable. FY-2G was located at 104.5 E and replaced FY-2E operation. FY-2E was shifted to 86.5 E and FY-2D finished his mission and standby for backup .

– The second generation geostationary satellite FY-4A will be launched in the late 2016. The fourth satellite of FY-3 (FY-3D) plan to launch at the end of 2016.

– Chinese first R&D Carbon satellite TANSAT will be launched at the end of 2016. CMA is in charge of its ground segment system establishment.

• Other major events affecting the agency or its participation in GSICS – Two NEW hyperspectral IR Sounders (FY-3D/HIRAS and FY-4A/GIIRS) from CMA will

be incorpated into GSICS reference family. – Satellite Requirement and instrument specification of the 3rd batch of FY-3 serial

satellite including 4 satellite (EM, AM, PM and Rainfall ) is determined and Early morning satellite will be launched in 2018 or later.

– CMA hope to develop a SI-traceable demo instrument for FY-3 in the 3rd batch for the preparation of Chinese CLARREO-like satellite in the future.

GSICS-EP-17, Biot, 2-3 June 2016 2

FY-2 running operation modification

• Latest FY-2G was located at 104.5 E and replaced FY-2E operation. FY-2E was shifted to 86.5 E and FY-2D finished its mission and standby for backup .

FY-3 hyperspectral HIRAS

26.17km

16km

39.43km

26.17km

26.17km 26.17km

Items Specification

Scanning cycle 10 s（33 FORs)

FOV 1.1（16Km）

Scanning Line 29*4 FORs

Max Scanning Range 50.4

Band Spectral range

(cm-1)

Resolution

(cm-1)

NET

@250K chs

Longwave 650 *– 1136

（15.38 m-8.8 m） 0.625 0.15K 778

Midwave1 1210 – 1750

（8.26m-5.71 m） 1.25 0.1K 433

Midwave2 2155-2550

（4.64m-3.92 m） 2.5 0.3K 159

HIRAS FOR Comparison with others

FY-3/HIRAS

Metop/IASI

NPP/CrIS

FY-4 hyperspetral FTIR GIIRS

Y

Z X

辐冷

主光学系统

散热板

二维扫描机构 前放盒

斯特林制冷机

干涉仪 中继及后光路

Bands

Longwave：700~1130cm-1(8.85m－14.3m)

Midwave：1650~2250cm-1(4.44m－6.06m)

Visble：0.55~0.75μm;

Spectral（cm-1）

Local observe：longwave 0.8；Midwave 1.6

Area observe：Longwave 1.6；Midwave 3.2

Spectral calibraton：10ppm

NEDL

(mW/m2sr.cm-1)

Local observe：longwave 0.5~1.1；Midwave 0.1~0.14

Area observe： longwave0.5~1.1；Midwave 0.1~0.14

Visible：S/N≥200（ρ=100%）

Spatial (FOV) Nadir：16km（IR）；2km（VIS）

Temporal Local observe：35min

Area observe：67min

Observation Local observe：1000km×1000km

Area observe：5000km×5000km

Quantization 13bits

Participation in EP, GDWG, GRWG • Points of contacts/meeting participants:

– EP Peng Zhang

– GDWG: Zhe Xu, Di Xian, Yuan Li

– GRWG: Xiuqing Hu, Na Xu, Lin Chen, Yong Zhang

• Main contribution to GDWG actions – CMA FY-2 GEO-LEO IR Products NRTC and RAC are available in CMA THREDDS

– CMA New Server in operation, hardware performance increased and CMA GSICS Server Installation and Configuration completed: http://gsics.nsmc.cma.gov.cn/thredds/catalog.html

– IASI L1.nc and GOME-2 L1.hdf from EUMETSAT for FY-2 intercalibration are online at THREDD server

• Main contribution to GRWG actions – LEO-LEO IR Calibration monitoring for FY-3C/MERSI/VIRR/IRAS were incorporated into CMA GSICS

system. FY-2 GEO-LEO and FY-3C LEO-LEO demo product ATBDs are done for review

– FY-3C/MERSI and FY-2 Lunar calibration initiation and lunar ground-based measurement plan to be conducted in 2015.

– DCC operational algorithm began to be developed for FY-3/MERSI and FY-2 VIS/NIR. DCC monitoring find out the large inconsistency in visible reflectance between FY-2D, FY-2E, FY-2F…

– FY-3C/MERSI Non-linear correction Using GSICS is being developed and combined method will be used to its operational calibration

• Comments, feedback – Great appreciation to EUMETSAT for providing IASI and GOME-2 for CMA GSICS product generation

and this decrease time delay and operational instability.

– Encourage the owner of other reference instrument to consider this kind of provider to other GPRCs and deepen the collaboration within GSICS community.

GSICS-EP-17, Biot, 2-3 June 2016 7

Current and prospective GSICS Products

GSICS-EP-17, Biot, 2-3 June 2016 8

Product Status Comments

GEO-LEO FY-2D/2E/2F – IASI IR

Demo NRTC,RAC, ATBD is ready

LEO-LEO FY-3C/MERSI /VIRR/IRAS-IASI

Demo NRTC, ATBD is ready

LEO-LEO FY-3C/MWHS /MWRI-NPP/ATMS

Planned Is being developed and done in 2016

FY-2 VIS and FY-3/MERSI DCC

Planned

Is being developed and done in 2016

• If GSICS community determine a microwave radiometer (Such as ATMS or Metop/AMSU) as the reference sensor and others compare with it?

• Which one of microwave imager is the reference sensor and How to generate GSICS products of the microwave imagers?

• Can we define the O-B as the primary product of microwave instruments and which radiative transfer model as the primary model (CRTM or RTTOVS)

Highlights of other calibration

activities of interest to the EP

• CMA found the contamination in preflight SRF characterization on the FY-2 WV bands and try a correction

• CMA Lunar calibration project from MOST initiated in 2015 and Ground-based Lunar observation experiment has great progress in Lijiang.

• Dunhuang Chinese Radiometric Calibration site (CRCS) begun to initiate the automatic in-situ measurement for ground surface reflectance and atmosphere aerosol for continuous vicarious calibration

GSICS-EP-17, Biot, 2-3 June 2016 9

Contamination in preflight characterization and correction on the FY-2 WV SRFs

GSICS-EP-17, Biot, 2-3 June 2016 10

6.2 6.4 6.6 6.8 7 7.2 7.4 7.6 7.80.2

0.4

0.6

0.8

1

Wavelength /μm

SR

F/ T

ran

sm

itta

nce

Raw SRF Measurement

Atmosphere Transmittance

6.2 6.4 6.6 6.8 7 7.2 7.4 7.6 7.80.2

0.4

0.6

0.8

1

Wavelength /μm

SR

F

Raw SRF Measurement

Ratio Corrected SRF

Smoothed SRF

（b）

（a）

1100 1200 1300 1400 1500 1600 1700 1800 1900

0.0

0.2

0.4

0.6

0.8

1.0

1100 1200 1300 1400 1500 1600 1700 1800 1900

200

220

240

260

280

300

320

Bri

gh

tne

ss T

em

pe

ratu

re / k

SR

F

Wavenumber(cm-1)

FY-2D

FY-2E

FY-2F

FY-2G

ratio between WV SRF and WV transmittance

comparison before and after corretion

Spectral Contamination of FY2X

6.2 6.4 6.6 6.8 7 7.2 7.4 7.6 7.8

0.4

0.5

0.6

0.7

0.8

0.9

1

FY-2G

FY-2D spectral correction

For FY-2D，based on the uncorrected SRF: 1）simulated TBB will be overestimated by 2.2K in clear sky. 2）BB radiation and then the onboard calibration will be overestimated by 7.6%.

CMA Lunar calibration project initiated in 2015 Ground-based Lunar observation Implementation

• CMA Team acquired a project funding from Chinese MOST (Ministry of Science and Technlogy) "Solar bands calibration technique based on Lunar radiance source” (2015~2017) .

• The main research points of this project include:

– moon prediction and geolocation,

– lunar radiance/irradiance model development,

– ground-based measurement and model validation and

– calibration algrithm development for satellite sensor.

• Collaboration partners: – National = Astronomical Observatories, Chinese Academy of Sciences(CAS)

– Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), CAS

– Nanjing University

– Jilin University

Prediction model for lunar position and geolocation of Lunar imager.

A model of Full-disk Lunar Radiance Model

A albedo model of Uniform Target on lunar surface

Validation of Lunar model by ground-based measure

Lunar Calibration algorithm development used for FY-3

Lunar Calibration algorithm development used for FY-2/4

Monitoring Degradation of sensors by lunar observation

Inter-calibration based on lunar observation

Lunar Observation in Lijiang, Yunnan

Lijiang Weather Radar station

Yulong Snow Mountain

Lunar Imaging Spectrometer

Hyperspectral Lunar-photometer

AOTF Imaging Spectrometer CE318U Lunar-photometer

HSFTS

Results From Lunar Imaging Spectrometer

• The instrument acquired lunar high spectral images in the wavelength of 400-1000nm in the different lunar phase during clear sky.

• Ground-based Lunar Observation for three months in Lijiang, Yunnan (Dec 17, 2015-- March 1, 2016).The measurement was conducted continuously from moonrise to moonset during the whole night .

Tracking CCD Spectral Images of lunar 13

Typical moon spectral radiance

(20151226)

(20160126)

Dunhuang base for Automatic vicarious calibration was established in 2015

14

房屋顶部仪器支架基座设计

19/08/2015 21/08/2015 31/08/2015 10/09/2015 14/09/2015 19/09/2015 26/09/2015 02/11/2015 11/11/2015 16/11/2015

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

AO

D

Date

AOD365

AOD412

AOD500

AOD610

AOD675

AOD862

AOD1024

Long term Automatic continuous Measurement at Dunhuang site

23/08/2015 01/09/2015 08/09/2015 16/09/2015 24/09/2015 01/10/2015 07/10/2015 14/10/2015 23/10/2015 02/11/2015 12/11/2015 22/11/2015 29/11/2015

-2

0

2

4

6

8

10

12

14

L(W

/(cm

\+(2

)·sr·

um

))

Date

Rad405

Rad450

Rad525

Rad610

Rad700

Rad808

Rad980

Rad1540

20150814——20151202 surface reflected radiance

19/08/2015 22/08/2015 31/08/2015 04/09/2015 11/09/2015 16/09/2015 25/09/2015 02/11/2015 08/11/2015 14/11/2015 18/11/2015

0

10000

20000

30000

40000

50000

60000

DN

Date

SUN365

SUN412

SUN500

SUN610

SUN675

SUN862

SUN1024

20150814——20151118 RawDN from Sunphotometer

20150814——20151118 AOD 15

Feedback on GSICS deliverables (one slide)

• Satellite data users – CMA NWP users strongly require data quality monitoring and

bias correction for the sounding instruments (MWTS,MWHS, WMRI, IRAS and GNOS) before the satellite data input the NWP assimilation model.

– CMA high level strongly recognizes the importance of the performance and health monitoring for the satellite and its instruments. The development of this kind of system like NOAA/ICVS has initiated.

• As a satellite operator – Needs for tools, services, datasets… – Feedback – Suggestion for developing/sharing other assets

GSICS-EP-17, Biot, 2-3 June 2016 16

Sugestion on CLARREO-like international

workshop in GSICS 2018 annual meeting

• CMA hope to host 2018 GSICS annual meeting (Shanghai )and expect GSICS help to push the CLARREO-like demonstration plan in China.

• CLARREO-like international workshop will be organized by GSICS and be held before or after GSICS annual meeting. This is very helpful for all GSICS members to push the similar satellite plan and establish the common GSICS reference.

• CMA hope to develop a SI-traceable demo instrument for FY-3 in the 3rd batch for the preparation of Chinese CLARREO-like satellite in the future.

GSICS-EP-17, Biot, 2-3 June 2016 17