Conference Agenda
Overview and details of the sessions and sub-session of this conference. Please select a date or session to show only sub-sessions at that day or location. Please select a single sub-session for detailed view (with abstracts and downloads if available).
Please note that all times are shown in CEST. The current conference time is: 13th Dec 2021, 09:44:10am CET
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Session Overview |
Session | ||||
Dr5 S.3.3: CAL/VAL
ID. 59198 European and Chinese RA | ||||
Presentations | ||||
10:50am - 11:10am
Accepted ID: 241 / Dr5 S.3.3: 1 Oral Presentation for Dragon 5 Calibration and Validation: 59198 - Absolute Calibration of European and Chinese Satellite Altimeters Attaining Fiducial Reference Measurements Standards Absolute Calibration of European and Chinese satellite altimeters attaining Fiducial Reference Measurements standards 1Technical University of Crete, Greece; 2National Satellite Ocean Application Service; 3Space Geomatica; 4Aristotle University of Thessaloniki This research and collaboration project aims at the calibration and validation (Cal/Val) of the European Sentinel-3, Sentinel-6 and the Chinese HY-2 satellite altimeters using two permanent Cal/Val facilities: (1) the Permanent Facility for Altimetry Calibration established by ESA in Crete, Greece and (2) the National Altimetry Calibration Cooperation Plan of China. Other satellites, such as the Guanlan, CryoSat-2, CFOSAT, CRISTAL, etc., may also be supported by these Cal/Val infrastructures. Satellites will be calibrated and monitored using uniform, standardized procedures and protocols while exploiting trusted and indisputable reference standards at both Cal/Val infrastructures in Europe and China. At present, the PFAC, Greece implements the action plan established by ESA for Fiducial Reference Measurements for Altimetry and reports its Cal/Val results along with their FRM uncertainty. Through the ESA Dragon-5 project, the FRM procedures, protocols and best practices, will be updated, upgraded and followed at both Cal/Val facilities in Europe and China. Calibration of altimeters is accomplished by examining satellite observations in open seas against reference measurements. Comparisons are established through precise satellite positioning, water level observations, GPS buoys and reference models (geoid, mean dynamic topography, earth tides, troposphere and ionosphere) all defined by Cal/Val sites. The final uncertainty (FRM status) for altimeter bias will be attributed to several individual error sources, coming from observations in water level, atmosphere, absolute positioning, reference surface models, transfer of heights from Cal/Val sites to satellite observations, etc. During this first year, the following tasks are been carried out:
The main findings of the joint work carried out by the European and Chinese teams so far are:
11:10am - 11:30am
Accepted ID: 217 / Dr5 S.3.3: 2 Oral Presentation for Dragon 5 Calibration and Validation: 58070 - Cal/Val of the First Chinese GNSS-R Mission Bufeng-1 A/B Recent Activities on Cal/Val of the First Chinese GNSS-R Mission Bufeng-1 A/B 1China Academy of Space Technology, China, People's Republic of; 2Institut d'Estudis Espacials de Catalunya; 3The National Satellite Meteorological Center (NSMC); 4DFH Satellite Co., Ltd.; 5The Institute of Remote Sensing and Geographic Information System (IRSGIS), Peking University Respect to the objectives and schedule of our project, the first-year report will include on-going activities and results of Bufeng-1 data processing, calibration workflow, and validation of the calibrated results on hurricane winds, soil moisture, and sea level measurements. The presentation has three parts. Firstly, a short introduction will be given about Bufeng-1 twin satellites that carry the Chinese first generation spaceborne GNSS-R instruments started using reflected GNSS signals to perform earth observation. Secondly, by utilizing the Bufeng-1 Normalized Bistatic Radar Cross Section (NBRCS), earth reflectivity, and range measurements, the preliminary results show that BuFeng-1 has a high agreement compared with other observations on severe sea surface winds, soil moisture, and sea level. In this presentation, the measurements of Bufeng-1 will be aligned with SFMR collected hurricanes, SMAP derived soil moisture, and DTU10 sea level models. Then, the validations of the accuracy and correlation coefficients will be analyzed to discuss the limitations and issues for the future research. For the last part, we will give the outlook about our future works of the objectives and the future plan of Bufeng missions.
11:30am - 11:50am
Accepted ID: 232 / Dr5 S.3.3: 3 Oral Presentation for Dragon 5 Calibration and Validation: 59236 - The Cross-Calibration and Validation of CSES/Swarm Magnetic Field and Plasma Data Progress on the Cross-Calibration and Validation of CSES/Swarm Satellite Magnetic Field and Plasma Measurements 1National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, China; 2German Research Centre for Geosciences, Potsdam, German; 3Wuhan University, Wuhan, China; 4Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; 5National Institute of Astrophysics-IAPS, Rome, Italy; 6National Space Science Center, Chinese Academy of Sciences, Beijing, China This report provides an overview of the recent progress on the cross-calibration and validation of CSES/Swarm satellite magnetic field and plasma measurements. Preliminary validation of the high precision magnetometer (HPM) measurements from CSES has shown good agreement with magnetic field measurements from Swarm. The HPM Level-2 scientific dataset and data description document, including data format, naming convention, and quality flags, have been released and can now be used as a reference by interested users. This dataset has recently been used to derive the CSES global geomagnetic field model (CGGM), one of the candidate models for the most recent version of the International Geomagnetic Reference Field (IGRF-13). Regarding the electron density and temperature measured by the Langmuir probe onboard CSES, comprehensive comparisons have been performed against measurements from both Swarm and the incoherent scatter radar at Millstone Hill, and predictions from the International Reference Ionosphere (IRI) model. The results showed that the CSES electron density measurements generally agree with the other measurements, though they present a relatively lower absolute value. Two kinds of platform interference on the CSES Langmuir probe have been identified: a sudden drop and another sudden rise of floating potential on the nightside and dayside, respectively, both linked to the adjustment of the current system equilibrium of the CSES platform (i.e., when the satellite flies into/out of the sunlight region).
11:50am - 12:10pm
Accepted ID: 341 / Dr5 S.3.3: 4 Oral Presentation for Dragon 5 Calibration and Validation: 59327 - Validation of Chinese CO2-Measuring Sensors and European TROPOMI/Sentinel-5 Precursor... Validation of Sentinel-5 Precursor and Chinese CO2-measuring Sensors Using FTIR and MAXDOAS Data at Xianghe 1Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, CHINA, China; 2Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Belgium It is very important to establish a longstanding ground-based FTIR and MAXDOAS measurement dataset at Xianghe that can be applied to evaluate the S5P and FY-3H/GAS and TanSat satellite measurements in northern China region. It is still of few ground measurements of FTIR and MAXDOAS measurement data that can be used as the reference data for validation of satellite observations in China. For the common products (NO2, O3 and HCHO) , the simultaneous FTIR and MAXDOAS measurements at Xianghe site allow us to understand their differences before combining them together for satellite validation. For other products (CO, CH4 and CO2), more focus will be taken on the ground-based FTIR retrievals. The column-averaged dry-air mole fractions of CO2 (XCO2), CH4 (XCH4) and CO (XCO) have been measured with a Bruker IFS 125HR Fourier-transform infrared (FTIR) spectrometer at Xianghe since June 2018. The HCHO data derived from the MAX-DOAS spectrometer and the FTIR instrument operating in parallel at Xianghe station (39.75° N, 116.96° E; ~55 km southeast of Beijing) were used to validate TROPOMI HCHO data products. The comparison results appear consistent with validation results obtained at TCCON sites for XCO2 and XCH4.
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