Preliminary validation of the refractivity from the new radio occultation  sounder GNOS/FY-3C

Liao, Mi; Zhang, Peng; Yang, Guanglin; Bi, Yanmeng; Liu, Yan; Bai, Weihua; Meng, Xiangli; Du, Qingyun; Sun, Yueqiang

doi:10.5194/amt-9-781-2016

Cited by 40 publications

(49 citation statements)

References 50 publications

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“…Overall the results confirm a high quality of the GNOS retrievals, in line with recent results by Liao et al (2016), and a robust zero-difference processing being a viable alternative for the single-difference processing. The results also show, that the BDS retrievals achieve a quality comparable to what is well established for GPS retrievals ( ).…”

Section: Comparison Analysis Of Bending Angle With Ecmwf Data 20supporting

confidence: 77%

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Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou System radio occultation data of the FY-3C GNOS mission

Bai¹,

Liu²,

Meng³

et al. 2017

Preprint

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The Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) is one of the 20 new generation payloads onboard the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmosphere and ionosphere. GNOS was designed for acquiring setting and rising radio occultation (RO) data by using GNSS signals from both the Chinese BeiDou System (BDS) and the U.S. Global Positioning System (GPS). An ultra-stable oscillator with 1-sec stability (Allan deviation) at the level of 10 -12 was 25 installed on FY-3C GNOS, thus both zero-difference and single-difference excess phase processing methods should be feasible for FY-3C GNOS observations. In this study we focus on evaluating zero-difference processing of BDS RO data vs. single-difference processing, in satellites. We used a 3-month set of GNOS BDS RO data (October to December 2013) for the evaluation and compared atmospheric bending angle and refractivity profiles, derived from 5 single-and zero-difference excess phase data, against co-located profiles from ECMWF (European Centre for Medium-Range Weather Forecasts) analyses. We also compared against co-located refractivity profiles from radiosondes. The statistical evaluation against these reference data shows that the results from single-and zero-difference processing are consistent in both bias and standard deviation, clearly demonstrating the feasibility of zero-10 differencing for GNOS BDS RO observations. The average bias (and standard deviation) of the bending angle and refractivity profiles were found to be as small as about 0.05%-0.2% (and 0.7%-1.6%) over the upper troposphere and lower stratosphere, including for the GEO, IGSO, and MEO subsets. Zero-differencing was found to perform slightly better, as may be expected from its lower vulnerability to noise. The validation results establish that GNOS can 15 provide, on top of GPS RO profiles, accurate and precise BDS RO profiles both from singleand zero-difference processing. The GNOS observations by the series of FY-3 satellites will thus provide important contributions to numerical weather prediction and global climate change analysis.

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Section: Comparison Analysis Of Bending Angle With Ecmwf Data 20supporting

confidence: 77%

“…These new GNSS navigation satellites 20 together with planned LEO missions will offer much more RO observations. One of these LEO missions is China's GNss Occultation Sounder (GNOS) onboard first time on the FengYun 3 series C satellite (FY-3C), which was successfully launched on 23 September 2013 (Liao et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou System radio occultation data of the FY-3C GNOS mission

Bai¹,

Liu²,

Meng³

et al. 2017

Preprint

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“…Therefore the refractivity profiles can be used to derive profiles of temperature, water vapor and ionospheric electron density. 15 Because of the ambiguity of temperature and humidity in lower troposphere (Healy and Eyre, 2000;Poli et al, 2002), one-dimensional variation (1-D-Var) analysis, involving co-located profiles of the Chinese global forecast model (used as background at T639L60 resolution), is used to retrieve temperature and humidity profiles (Liao et al, 2016 atmospheric occultation event will occupy an ionospheric occultation channel. Therefore, the number of complete ionospheric occultation profiles is less than that of the atmospheric RO events, and there are typically around 220 GPS and 130 BDS ionospheric RO events per day.…”

Section: Fy-3c Gnos Level-2 Data Processingmentioning

confidence: 99%

“…Thus, the FY-3C satellite POD performance has been evaluated by difference GNSS data processing 5 centers (Liao et al, 2016;Li et al, 2017;Xiong et al, 2017; by using the Bernese software (Liao et al, 2016) and PANDA software , separately. In all these POD data quality evaluations, an internal consistency metrics method named overlapping orbit differences (OODs) has been used.…”

Section: Evaluation Of the Fy-3c Satellite Pod Datamentioning

confidence: 99%

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The FengYun-3C radio occultation sounder GNOS: a review of the mission and its early results and science applications

Sun¹,

Bai²,

Liu³

et al. 2018

Preprint

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The Global Navigation Satellite System (GNSS) occultation sounder (GNOS) is one of the new generation payloads onboard the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmosphere and ionosphere. FY-3C GNOS, onboard the FY-3 satellite C launched in September 2013, was designed for acquiring setting and rising radio 5 occultation (RO) data by using GNSS signals from both the Chinese BeiDou System (BDS) and the U.S. Global Positioning System (GPS). So far, the GNOS measurements and atmospheric and ionospheric data products have been validated and evaluated and then been used for atmosphere and ionosphere related scientific applications. This paper reviews the FY-3C GNOS instrument, RO data processing, data quality evaluation, 10 and research applications. The reviewed data validation and application results demonstrate that the FY-3C GNOS mission can provide accurate and precise atmospheric and ionospheric GNSS (i.e., GPS and BDS) RO profiles for numerical weather prediction (NWP), global climate monitoring (GCM) and space weather research (SWR). The performance of the FY-3C GNOS product quality evaluation and scientific applications establishes confidence that the GNOS data 15 from the series of FY-3 satellites will provide important contributions to SWP, GCM and SWR scientific communities.

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The Representation of Tropospheric Water Vapor Over Low-Latitude Oceans in (Re-)analysis: Errors, Impacts, and the Ability to Exploit Current and Prospective Observations

Pincus

Beljaars

Buehler³

et al. 2017

Space Sciences Series of ISSI

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Preliminary validation of the refractivity from the new radio occultation sounder GNOS/FY-3C

Cited by 40 publications

References 50 publications

Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou System radio occultation data of the FY-3C GNOS mission

Evaluation of atmospheric profiles derived from single- and zero-difference excess phase processing of BeiDou System radio occultation data of the FY-3C GNOS mission

The FengYun-3C radio occultation sounder GNOS: a review of the mission and its early results and science applications

The Representation of Tropospheric Water Vapor Over Low-Latitude Oceans in (Re-)analysis: Errors, Impacts, and the Ability to Exploit Current and Prospective Observations

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