Applications of GNSS-RO to Numerical Weather Prediction and Tropical Cyclone Forecast
Abstract
:1. Brief Introduction to GNSS-RO Technique
1.1. Principle of RO
1.2. RO Missions
- (1)
- COSMIC. On 15 April 2006, the first satellite constellation COSMIC designed for RO measurements was launched. It marked the beginning of the wide use of RO data in atmospheric and ionospheric sounding research from an operational standpoint [13]. Since then, COSMIC has provided 1500–2000 soundings per day globally, significantly contributing to numerical weather prediction (NWP) and meteorological studies [14]. Later, its follow-up mission was COSMIC-2, launched in June 2019; COSMIC-2 has provided approximately 5000 soundings per day over 35° N–35° S, mainly for tropical cyclone (TC) forecasting [15]. Such data are useful for short- and medium-range forecasts in the tropics, given the more accurate measurements of the temperature, humidity, and wind field [16]. The European Centre for Medium-Range Weather Forecasts (ECMWF) started to assimilate COSMIC-2 data at a rate of approximately 5000 soundings per day since March 2020.
- (2)
- MetOp. MetOp-A/B/C are three polar-orbiting meteorological satellites that form the space segment component of the overall EUMETSAT Polar System (EPS). MetOp-A was launched in 2006, and its RO data were found to contribute to weather forecasts up to 10 days ahead. This mission was followed by MetOp-B and C. Since March 2019, the ECMWF started to assimilate the bending angle from MetOp-C, with a quality similar to both MetOp-A and B measurements. Currently, the MetOp constellation can provide approximately 2000 soundings per day. As a next step, the EUMETSAT group has planned to launch six MetOp-second-generation (MetOp-SG) satellites. MetOp SG-A is scheduled for launch at the end of 2022.
- (3)
- FY-3C/D. FY-3C and D were launched in 2013 and 2017, respectively. The GNSS occultation sounder (GNOS) receiver onboard the FY-3C/D satellites is the first GPS and BeiDou-compatible sounder [17,18,19,20]. FY-3C can provide approximately 450–500 RO soundings per day for NWP. The FY-3D launched in 2020 can provide even more RO soundings, approximately 1000 per day. The GNOS-RO data have been used to study climate and TCs [21,22]. GNOS data have been assimilated into the operational NWP system of the ECMWF, Deutscher Wetterdienst (DWD), and Met Office [23]. Moreover, the FY-3-series satellites contain FY-3E/F/G/H and FY-3R, which are intended for rainfall observation. These missions are expected to be launched by 2025 and will provide ten years of continuous RO data. An advanced GNOS receiver (GNOS II) has been designed for the FY-3E satellite, making FY-3E applicable for monitoring sea waves as well [24].
1.3. Advantages of RO
2. Research and Applications of RO in NWP
2.1. Progress in the Application of RO to NWP
2.2. Impact of the Amount of RO Data on NWP and Future Trends
3. Research and Applications of RO to TC Forecast
3.1. Status of TC Forecast
3.2. Effect of RO Data on TC Forecasts
3.3. Effect of RO Assimilation Operator on TC Forecasts
4. Outlook
4.1. Trends Toward Increasing the Amount of RO Soundings
4.1.1. Multi-System-Compatible RO Receivers
4.1.2. Commercial Cube Satellite Constellation
4.1.3. Airborne RO Technique
4.2. Trends Toward Expanding New Features of RO
4.2.1. Polarimetric RO Technique
4.2.2. Multi-Feature GNSS Receiver
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Mission | Soundings/Day |
---|---|
COSMIC-2 | 5000 |
MetOp-A/B/C | 1905 |
FY-3C/D | 1000 |
TanDEM-X | 100 |
TerraSAR-X | 200 |
KOMPSAT-5 | 500 |
PAZ | 300 |
Total data | 9005 |
Actual received data | ~6000 |
Data used | ~5000 |
Observation | Assimilation Operator | |
Refractivity | Local refractivity | |
Non-local refractivity | ||
Non-local excess phase | ||
Bending angle | Local bending angle | |
2D/3D Ray tracer |
Sonder | GNSS Tracked | Soundings/Day | Satellite | Status |
---|---|---|---|---|
TriG | GPS, GALILEO | ~500 | COSMIC-2 | In orbit |
~600 | GRACE-FO | |||
TriG (JASON-CS) | GPS, GALILEO, GLONASS | ~1000 | JASON-CS-A/B | Planned |
GNOS | GPS, BeiDou | ~1000 | FY-3D | In orbit |
GNOS-2 | FY-3E/F/G/H/R | Planed | ||
GRAS | GPS | ~650 | MetOp-A/B/C | In orbit |
RO | GPS, Galileo, GLONASS, Beidou (2 or 3 of them) | ~1100-1500 | MetOp-SG-A/B | Planned |
IGOR | GPS | ~100 | TanDEM-X | In orbit |
~200 | TerraSAR-X | |||
TSX-NG | Planned | |||
ARMA-MP | GPS, Galileo, GLONASS | ~2000 | Meteor-MP | Planned |
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Share and Cite
Bai, W.; Deng, N.; Sun, Y.; Du, Q.; Xia, J.; Wang, X.; Meng, X.; Zhao, D.; Liu, C.; Tan, G.; et al. Applications of GNSS-RO to Numerical Weather Prediction and Tropical Cyclone Forecast. Atmosphere 2020, 11, 1204. https://doi.org/10.3390/atmos11111204
Bai W, Deng N, Sun Y, Du Q, Xia J, Wang X, Meng X, Zhao D, Liu C, Tan G, et al. Applications of GNSS-RO to Numerical Weather Prediction and Tropical Cyclone Forecast. Atmosphere. 2020; 11(11):1204. https://doi.org/10.3390/atmos11111204
Chicago/Turabian StyleBai, Weihua, Nan Deng, Yueqiang Sun, Qifei Du, Junming Xia, Xianyi Wang, Xiangguang Meng, Danyang Zhao, Congliang Liu, Guangyuan Tan, and et al. 2020. "Applications of GNSS-RO to Numerical Weather Prediction and Tropical Cyclone Forecast" Atmosphere 11, no. 11: 1204. https://doi.org/10.3390/atmos11111204