Results 61 to 70 of about 1,788,071 (189)

A Cluster-Based Method for Hydrometeor Classification Using Polarimetric Variables. Part II: Classification

Journal of Atmospheric and Oceanic Technology, 2016
AbstractTwo new algorithms for hydrometeor classification using polarimetric radar observations are developed based on prototypes derived by applying clustering techniques (Part I of this two-part paper). Each prototype is defined as a probability distribution of the polarimetric variables and ambient temperature corresponding to a hydrometeor type ...
Guang Wen, Alain Protat, Peter T. May, William Moran, Michael Dixon   +4 more
openaire   +1 more source

A Framework for Modeling Aerosol‐Cloud‐Lightning Interactions: Validation of Charge Structure and Aerosol Effects

Earth and Space Science, Volume 13, Issue 9, September 2026.
Abstract This study develops a novel framework within the Weather Research and Forecast Model for modeling aerosol‐cloud‐lightning interactions. The framework explicitly represent aerosol‐cloud interactions by prescribing aerosols with two configurations: an idealized setup, where both cloud condensation nuclei (CCN) and ice nucleating particles (IN ...
Weishan Wang, Guoxing Chen, Yijun Zhang, Jen‐Ping Chen, Dong Zheng, Liangtao Xu, Chuanhong Zhao   +6 more
wiley   +1 more source

Melting-layer modelling at C-Band [PDF]

Advances in Radio Science, 2010
Stratiform cloud formations, such as a uniform type of precipitating clouds, are sub dividable into layers with different aggregate states. In this way, it is adaptable to measurements with polarimetric radar.
J. Steinert, M. Chandra
doaj   +1 more source

Impact of Convective Intensity on Mixed‐Phase Evolution and Upper Positive Charge Region Formation in an Isolated Convective Cloud

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 16, 28 August 2026.
Abstract Lightning initiation depends on the charge separation within the mixed‐phase areas of convective clouds, where graupel, ice, and supercooled water interact. However, the specific mixed‐phase structures that enhance charge separation remain unclear.
M. Kondo, T. Ushio
wiley   +1 more source

Assessment and tuning of the behaviour of a microphysical characterisation scheme [PDF]

Advances in Geosciences, 2005
The correct classification of prevailing bulk hydrometeor type within a radar resolution volume is a challenge task even if a full set of polarimetric radar observables is available.
M. Galletti, M. Galletti, P. P. Alberoni, V. Levizzani, Celano, Celano   +5 more
doaj  

Seasonal Reversal of Polarity Dominance in High‐Current Cloud‐to‐Ground Return Strokes Over East Asian Midlatitudes

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Extreme positive cloud‐to‐ground lightning over East Asian midlatitudes exhibits a spring–autumn double maximum hidden by the familiar winter climatology. Using 1,838,538 return strokes with absolute peak currents at least 200 kA during 2006–2024, we resolve its annual cycle by month and latitude.
Nengxing Guo, Li Cai, Yu Feng, Wenzhao Lu, Yongxing Zeng, Yuheng Niu, Chun Zhao, Shanqiang Gu   +7 more
wiley   +1 more source

Boundary‐Aware Physical Constraints Refine Satellite Precipitation Occurrence Over the Qinghai‐Tibet Plateau

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Over complex terrain, hourly precipitation occurrence estimates are often distorted by weak, persistent, and mistimed wet hours that are poorly constrained by independent time‐step classification. Using 1,232 hourly gauge records over the Qinghai‐Tibet Plateau (QTP), we develop a boundary‐aware physical‐constraint framework that learns ...
Chun Zhou, Li Zhou, Luca Brocca, Yinan Guo, Xiaojun Guo, Jiajia Yue, Keying Liu, Ming Li, Haowen Li, Chuanjie Yan   +9 more
wiley   +1 more source

Convolutional Neural Networks for Hydrometeor Classification using Dual Polarization Doppler Radars

2019 International Conference on Data Mining Workshops (ICDMW), 2019
Traditional fuzzy logic hydrometeor classification algorithm is a common way to classify precipitation type from dual polarization doppler radar. We propose a deep learning-based method to estimate hydrometeors efficiently using observed radar variables such as horizontal reflectivity (Z H ), differential reflectivity (Z DR ), correlation coefficient ...
Yuping Lu, Jitendra Kumar 0001
openaire   +2 more sources

The Role of Lightning in Atmospheric Chemistry

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 16, 28 August 2026.
Abstract Lightning has important effects on atmospheric constituents in primarily the middle and upper troposphere. We summarize the effects of lightning on atmospheric chemistry that have been published since the last major review in 2007. The estimates of NOx production by lightning (LNOx) are based on five methods: theoretical/laboratory estimates ...
Kenneth E. Pickering, Dale J. Allen, Heidi Huntrieser   +2 more
wiley   +1 more source

A cross-instrument closure and polarimetric study for improving sub-millimeter polarimeter-radiometer ice cloud microphysics retrievals [PDF]

Atmospheric Chemistry and Physics
Ice cloud microphysical properties, such as phase, shape, size and density, introduce significant uncertainties and biases that affect our understanding of how clouds influence weather and climate.
J. Gong, Y. Liu, J. A. Finlon, J. A. Finlon, I. S. Adams, R. A. Kroodsma, D. L. Wu, R. Bennartz   +7 more
doaj   +1 more source