Results 41 to 50 of about 333 (162)

Wind Speed Estimation From CYGNSS Using Artificial Neural Networks

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
In this article, a retrieval algorithm based on the use of an artificial neural network (ANN) is proposed for wind speed estimations from cyclone global navigation satellite system (CYGNSS).
Jennifer Reynolds, Maria Paola Clarizia, Emanuele Santi   +2 more
doaj   +1 more source

The NASA CYGNSS SmallSat Constellation

, 2023
The NASA Cyclone Global Navigation Satellite System (CYGNSS) is a constellation of eight microsatellites in low earth orbit at ~525 km altitude and 35 deg inclination. CYGNSS was launched in December 2016 for a planned 2 year mission and 7 of the 8 spacecraft continue to operatue nominally as of May 2023.
Ruf, Christopher, McKague, Darren, Chew, Clara, Warnock, April, Wells, William   +4 more
openaire   +1 more source

Detecting Localized Floods in Tropical Regions With CYGNSS SmallSat Constellation: A Proof of Concept From the Maritime Continent

Geophysical Research Letters, Volume 52, Issue 20, 28 October 2025.
Abstract Flooding events are a major contributor to natural disasters across the global tropics. However, reliable flood data are sparse, which limits our ability to understand flood dynamics across spatial and temporal scales. Here, data from the CYGNSS SmallSat constellation are utilized to identify small‐ to regional‐scale flooding events in Sumatra.
Zofia Baldysz, Dariusz B. Baranowski, Piotr J. Flatau, Maria K. Flatau, Clara Chew   +4 more
wiley   +1 more source

Distribution of Plastics of Various Sizes and Densities in the Global Ocean From a 3D Eulerian Model

Journal of Geophysical Research: Oceans, Volume 130, Issue 9, September 2025.
Abstract We study the global transport and distribution of microplastics (MPs) using a three‐dimensional Eulerian model. For the first time, the effects of both particle size and density are accounted for, influencing the vertical transport of MPs, and leading to an advanced understanding of their global distribution.
Zih‐En Tseng, Yue Wu, Dimitris Menemenlis, Guangyao Wang, Chris Ruf, Yulin Pan   +5 more
wiley   +1 more source

Evaluation of Spaceborne GNSS-R Retrieved Ocean Surface Wind Speed with Multiple Datasets

Remote Sensing, 2019
Spaceborne Global Navigation Satellite Systems-Reflectometry (GNSS-R) can estimate the geophysical parameters by receiving Earth’s surface reflected signals. The CYclone Global Navigation Satellite System (CYGNSS) mission with eight microsatellites
Zhounan Dong, Shuanggen Jin
doaj   +1 more source

First Evaluation of Topography on GNSS-R: An Empirical Study Based on a Digital Elevation Model

Remote Sensing, 2019
Understanding the effects of Earth’s surface topography on Global Navigation Satellite Systems Reflectometry (GNSS-R) space-borne data is important to calibrate experimental measurements, so as to provide accurate soil moisture content (SMC ...
Hugo Carreno-Luengo, Guido Luzi, Michele Crosetto   +2 more
doaj   +1 more source

Regional Land Surface Conditions Developed Using the High‐Resolution Land Data Assimilation System: Challenges Over Complex Orography Himalayan Region

Meteorological Applications, Volume 32, Issue 4, July/August 2025.
High‐resolution land data assimilation system (HRLDAS) simulations at 2 km resolution from 2011 to 2021 over Uttarakhand. HRLDAS outperforms global and regional analyses by capturing finer spatial heterogeneity, with lower soil moisture error and high soil temperature correlation (0.94) against satellite and in situ observations.
Buri Vinodhkumar, Krishna Kishore Osuri, A. P. Dimri, Sandipan Mukherjee, Sami G. Al‐Ghamdi, Dev Niyogi   +5 more
wiley   +1 more source

High Spatio-Temporal Resolution CYGNSS Soil Moisture Estimates Using Artificial Neural Networks

Remote Sensing, 2019
This paper presents a learning-based, physics-aware soil moisture (SM) retrieval algorithm for NASA’s Cyclone Global Navigation Satellite System (CYGNSS) mission.
Orhan Eroglu, Mehmet Kurum, Dylan Boyd, Ali Cafer Gurbuz   +3 more
doaj   +1 more source

CYGNSS Satellite Sampling of Surface Heat Fluxes Across Atmospheric River Life Cycles

Geophysical Research Letters, Volume 52, Issue 10, 28 May 2025.
Abstract This study employs CYGNSS data to explore the life cycle of atmospheric rivers (ARs) on a near global scale, focusing on ocean surface turbulent heat flux variations. Using spaceborne measurements matched to different stages of full AR life cycles for the first time, we show declining latent and sensible heat fluxes throughout the AR life ...
Shakeel Asharaf, Bin Guan, Duane E. Waliser   +2 more
wiley   +1 more source

Tropical Cyclones Across Global Basins: Dynamics, Tracking Algorithms, Forecasting, and Emerging Scientometric Research Trends

Meteorological Applications, Volume 32, Issue 3, May/June 2025.
Graphical abstract illustrating the integrated framework of tropical cyclone dynamics, advanced tracking algorithms, and evolving research frontiers for improved forecasting and risk mitigation. ABSTRACT Tropical cyclones (TCs) pose significant threats to life and property across global ocean basins, and forecasting their structural evolution, track ...
Vivek Singh, Gaurav Tiwari, Amarendra Singh, Rajeeb Samanta, Atul Kumar Srivastava, Deewan Singh Bisht, Ashish Routray, Sushil Kumar, Shivaji Singh Patel, Abhishek Lodh   +9 more
wiley   +1 more source