Results 31 to 40 of about 561,644 (183)

Optimal Configuration for Satellite PEPs using a Reliable Service on Top of a Routers-Assisted Approach [PDF]

, 2009
Routers-assisted congestion control protocols, also known as Explicit Rate Notification (ERN) protocols, implement complex algorithms inside a router in order to provide both high link utilization and high fairness.
Dino Martin Lopez-Pacheco, Lopez Pacheco, Dino, Emmanuel Lochin, Lochin, Emmanuel, Lopez-Pacheco, Dino Martin   +4 more
core   +1 more source

Assimilation of SEVIRI Water Vapour Radiances in HARMONIE-AROME at Large Satellite Zenith Angles

Tellus: Series A, Dynamic Meteorology and Oceanography
This study suggests potential benefits in forecast performance by assimilating clear-sky satellite radiances from geostationary based SEVIRI instrument into the limited area model of HARMONIE-AROME in the far North of Europe.
David Schönach, Reima Eresmaa, Heikki Järvinen   +2 more
doaj   +1 more source

Using microwave imager observations to improve the ocean temperature in a coupled NWP system

Quarterly Journal of the Royal Meteorological Society, EarlyView.
A recent upgrade to the ECMWF IFS has implemented outer‐loop coupling between the atmosphere and the ocean. This work uses this method to pass ocean skin temperature estimates derived from satellite‐borne microwave imagers to the ocean data assimilation system; the updated ocean state is then passed back to the atmospheric system.
Tracy Scanlon, Alan J. Geer, Philip Browne, Patricia de Rosnay, Niels Bormann   +4 more
wiley   +1 more source

Coupled observation‐operator approximations in outer‐loop coupling data assimilation

Quarterly Journal of the Royal Meteorological Society, EarlyView.
We present a methodology for coupled variational data assimilation that allows the effect of coupled observation operators whilst maintaining separate minimisations across model components. This allows us to constrain the atmosphere, ocean, and sea‐ice components of our coupled model directly from satellite radiances. We illustrate the system in action
P. A. Browne, P. de Rosnay, A. J. Geer, S. Quesada‐Ruiz, T. Scanlon, E. Villeneuve   +5 more
wiley   +1 more source

Characteristics of upper‐level updrafts and downdrafts in the anvils of tropical deep convective clouds

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study investigates the thermodynamic and microphysical characteristics of updrafts and downdrafts of tropical deep convective anvil clouds using in situ measurements. We found that parts of the downdrafts are in ice supersaturation in these clouds.
Sreehari Kizhuveettil, Jordi Vila‐Guerau de Arellano, Martina Krämer, Armin Afchine, Luiz A. T. Machado, Martin Zöger, Wiebke Frey   +6 more
wiley   +1 more source

Evaluation and assimilation of Arctic Weather Satellite data in the AROME‐Arctic forecast system

Quarterly Journal of the Royal Meteorological Society, EarlyView.
The Arctic Weather Satellite (AWS), launched in August 2024, is a prototype for the future EPS–Sterna constellation of small satellites carrying an innovative microwave sounder. We present the first assessment of AWS in the regional AROME‐Arctic numerical weather prediction system, covering post‐launch calibration results and the impact of AWS ...
Stéphanie Guedj, Per Dahlgren, Máté Mile   +2 more
wiley   +1 more source

3rd generation partnership project integration of non-geostationary orbit satellites

, 2023
359378In recent years, an ever-growing connectivity demand is experienced in wireless communications. Practically, everyone and everything need to be connected. This trend is supported by the rich variety of applications available on the market.
Heyn, Thomas, Ahmadzadeh, Arman, Hofmann, Alexander   +2 more
core   +1 more source

The CODYSUN Approach: A Novel Distributed Paradigm for Dynamic Spectrum Sharing in Satellite Communications

Sensors, 2021
With a constant increase in the number of deployed satellites, it is expected that the current fixed spectrum allocation in satellite communications (SATCOM) will migrate towards more dynamic and flexible spectrum sharing rules.
Irfan Jabandžić, Fadhil Firyaguna, Spilios Giannoulis, Adnan Shahid, Atri Mukhopadhyay, Marco Ruffini, Ingrid Moerman   +6 more
doaj   +1 more source

The benefit of neighborhood methods for the assimilation of cloud‐affected radiances evaluated in observing‐system simulation experiments

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Neighborhood methods are commonly used in verification to avoid the double‐penalty issue. This study evaluates such methods for the assimilation of infrared and visible satellite observations and extends them to multiscale assimilation. Moreover, a novel technique is tested aimed at mitigating complex biases and structural errors in real‐world model ...
Lukas Kugler, Stefano Serafin, Andrea Hochebner, Nicola Pierotti, Martin Weissmann   +4 more
wiley   +1 more source

Nowcasting convective cores using deep learning

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Key findings: •$$ \bullet $$ Network for Nowcasting Convective Cores (NetNCC) has considerable potential for convective storm nowcasting and the development of early warning systems for extreme rainfall. •$$ \bullet $$ Skilful nowcasts of convective cores are obtained at fine spatial resolutions (<30km$$ <30\kern0.15em \mathrm{km} $$) for up to 2 hr ...
Jawairia A. Ahmad, Cornelia Klein, Christopher Taylor, Seonaid R. Anderson, Steven C. Wells, David C. Hogg   +5 more
wiley   +1 more source