Results 71 to 80 of about 1,044 (196)

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 Satellite-Based Global Navigation Satellite System Reflectometry (GNSS-R) Soil Moisture Products in Complex Terrain: A Case Study of the Yunnan–Guizhou Plateau

Remote Sensing
Complex terrain is one of the main factors affecting the process of retrieving surface soil moisture using GNSS-R technology. This study evaluates the impact of complex terrain on surface soil moisture inversion using Cyclone Global Navigation Satellite ...
Yixiao Liu, Yong Wang, Jingcheng Lai, Yunjie Lin, Leyan Shi   +4 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

Soil moisture and forest biomass retrieval on a global scale by using CyGNSS data and artificial neural networks

, 2020
This study aims at assessing the potential of the NASA's Cyclone GNSS (CyGNSS) data for observing SM and forest biomass. As reference values for the comparison, global datasets of Vegetation Optical Depth (VOD) and SM derived from NASA's Soil Moisture ...
Santi E., Comite D., Paloscia S., Pettinato S., Guerriero L., Clarizia M. P., Pierdicca N., Dente L., L. Dente, D. Comite, N. Pierdicca, S. Pettinato, L. Guerriero, E. Santi, S. Paloscia, M.P. Clarizia   +15 more
core   +1 more source

Intercomparison of Models For CYGNSS Delay-Doppler Maps at a Validation Site in the San Luis Valley of Colorado

, 2021
A comparison of three different electromagnetic scattering models for delay-Doppler maps (DDMs) of global navigation satellite system reflectometry (GNSS-R) from land is performed along a Cyclone Global Navigation Satellite System (CYGNSS) track over a ...
Azemati A., Comite D., Ruf C. S., Xu H., Campbell J. D., Hodges E., Dente L., Johnson J. T., Kim S. -B., Tsang L., Bringer A., Gleason S. T., Guerriero L., Moghaddam M., Pierdicca N., Akbar R., Melebari A., Ren B., Zhu J.   +18 more
core   +1 more source

Rationale of GNSS Reflected Delay–Doppler Map (DDM) Distortions Induced by Specular Point Inaccuracies

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
Global navigation satellite system reflectometry (GNSS-R)-derived winds from the cyclone GNSS (CYGNSS) satellite constellation are expected to significantly improve weather forecasts in the tropical region.
Giuseppe Grieco, Ad Stoffelen, Marcos Portabella   +2 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

Assessment of CYGNSS Wind Speed Retrieval Uncertainty

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2019
Measurements of near surface wind speed made by the Cyclone Global Navigation Satellite System (CYGNSS) constellation of GNSS-R satellites are evaluated and their uncertainty is assessed in two ways. A bottom-up assessment begins with a model for the error in engineering measurements and propagates that error through the wind speed retrieval algorithm ...
Christopher S. Ruf, Scott Gleason 0001, Darren S. McKague   +2 more
openaire   +2 more sources

Using CYGNSS Data to Monitor China’s Flood Inundation during Typhoon and Extreme Precipitation Events in 2017

, 2019
NASA’s Cyclone Global Navigation Satellite System (CYGNSS) mission, launched in 2016, is a small satellite constellation designed to measure the ocean surface wind speed in hurricanes and tropical cyclones.
Wei Wan, Baojian Liu, Liwen Xu, Guiping Wu, Xi Chen, Ziyue Zeng, Xiuwan Chen, Yang Hong   +7 more
core   +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