Weihua Ai
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View article: Supplementary material to "Aerosol-Driven Precipitation Modification: Spatiotemporal Heterogeneity in Precipitation Microphysics and Vertical Structures over China's Megacity Clusters"
Supplementary material to "Aerosol-Driven Precipitation Modification: Spatiotemporal Heterogeneity in Precipitation Microphysics and Vertical Structures over China's Megacity Clusters" Open
View article: Aerosol-Driven Precipitation Modification: Spatiotemporal Heterogeneity in Precipitation Microphysics and Vertical Structures over China's Megacity Clusters
Aerosol-Driven Precipitation Modification: Spatiotemporal Heterogeneity in Precipitation Microphysics and Vertical Structures over China's Megacity Clusters Open
As crucial atmospheric components, aerosols influence precipitation through complex microphysical mechanisms and exhibit spatiotemporal heterogeneity. This study investigates aerosol effects on precipitation vertical structures and microph…
View article: Preliminary Analysis of a Novel Spaceborne Pseudo Tripe-Frequency Radar Observations on Cloud and Precipitation: EarthCARE CPR-GPM DPR Coincidence Dataset
Preliminary Analysis of a Novel Spaceborne Pseudo Tripe-Frequency Radar Observations on Cloud and Precipitation: EarthCARE CPR-GPM DPR Coincidence Dataset Open
By integrating EarthCARE W-band doppler cloud radar observations with GPM Ku/Ka-band dual-frequency precipitation radar data, this study constructs a novel global “pseudo tripe-frequency” radar coincidence dataset comprising 2886 coinciden…
View article: On the Hybrid Algorithm for Retrieving Day and Night Cloud Base Height from Geostationary Satellite Observations
On the Hybrid Algorithm for Retrieving Day and Night Cloud Base Height from Geostationary Satellite Observations Open
Most existing cloud base height (CBH) retrieval algorithms are only applicable for daytime satellite observations due to their dependence on visible observations. This study presents a novel algorithm to retrieve day and night CBH using in…
View article: MF‐UFNO: A Fourier Neural Operators‐Based Model for Radar Echo Extrapolation
MF‐UFNO: A Fourier Neural Operators‐Based Model for Radar Echo Extrapolation Open
Severe convective weather events, such as heavy rainfall and flooding, are serious threats to human society. However, accurate nowcasting of these events using radar remains challenging due to the complex dynamics and nonlinear physical pr…
View article: The enigma of spurious echoes: Enhancing phase transition height detection in shallow convective precipitation with GPM DPR
The enigma of spurious echoes: Enhancing phase transition height detection in shallow convective precipitation with GPM DPR Open
View article: Characteristics of Precipitation Melting Layer Over China and its Coastal Regions Detected by the Gpm Dual-Frequency Precipitation Radar
Characteristics of Precipitation Melting Layer Over China and its Coastal Regions Detected by the Gpm Dual-Frequency Precipitation Radar Open
View article: Retrieval of Significant Wave Height From Sentinel-1 Wave Mode Data Under Rainfall Conditions With Dual-Branch CNN
Retrieval of Significant Wave Height From Sentinel-1 Wave Mode Data Under Rainfall Conditions With Dual-Branch CNN Open
Spaceborne synthetic aperture radar (SAR) is widely used in ocean wave monitoring due to its high resolution and all-weather observation capability. Rainfall distorts sea surface wave spectra and SAR imagery, yet current significant wave h…
View article: Near-Inertial Oscillations Induced by Winter Monsoon Onset in the Southwest Taiwan Strait
Near-Inertial Oscillations Induced by Winter Monsoon Onset in the Southwest Taiwan Strait Open
The near-inertial motion in ocean surface currents directly reflects the energy transported by wind towards the surface layer, playing an important role in climate regulation and energy balance. Previous studies have mainly focused on near…
View article: Tropical Cyclone Wind Direction Retrieval Based on Wind Streaks and Rain Bands in SAR Images
Tropical Cyclone Wind Direction Retrieval Based on Wind Streaks and Rain Bands in SAR Images Open
Tropical cyclones (TCs) are associated with severe weather phenomena, making accurate wind field retrieval crucial for TC monitoring. SAR’s high-resolution imaging capability provides detailed information for TC observation, and wind speed…
View article: Atmospheric Gravity Wave Detection in Low-Light Images: A Transfer Learning Approach
Atmospheric Gravity Wave Detection in Low-Light Images: A Transfer Learning Approach Open
Atmospheric gravity waves, as a key fluctuation in the atmosphere, have a significant impact on climate change and weather processes. Traditional observation methods rely on manually identifying and analyzing gravity wave stripe features f…
View article: Microphysical Characteristics of Monsoon Precipitation over Yangtze-and-Huai River Basin and South China: A Comparative Study from GPM DPR Observation
Microphysical Characteristics of Monsoon Precipitation over Yangtze-and-Huai River Basin and South China: A Comparative Study from GPM DPR Observation Open
It is rare to conduct a comparative analysis of precipitation characteristics across regions based on long-term homogeneous active satellite observations. By collocating the Global Precipitation Measurement Dual-frequency Precipitation Rad…
View article: Surface Vector Current Retrieval by Single-Station High-Frequency Surface Wave Radar Based on Ocean Dynamics in the Taiwan Strait
Surface Vector Current Retrieval by Single-Station High-Frequency Surface Wave Radar Based on Ocean Dynamics in the Taiwan Strait Open
In order to address the issue of limited common coverage and high cost in mapping ocean surface vector current by two (or more) high-frequency surface wave radars, this paper proposes a single-station surface wave radar vector current inve…
View article: Night-time light loss during the 2022 Kyiv offensive revealed through VIIRS DNB
Night-time light loss during the 2022 Kyiv offensive revealed through VIIRS DNB Open
The satellite low-light imagers can detect changes in nighttime lights caused by ground military conflict. The Kyiv Offensive in Kyiv, Ukraine, which lasted less than 40 days during the Russia – Ukraine conflict, began on 24 February 2022.…
View article: A Scheme for Credibility of Surface Currents Derived From High Frequency Radars
A Scheme for Credibility of Surface Currents Derived From High Frequency Radars Open
Large amount of real-time ocean currents measured by HF radar have been included into the ocean observation database in many countries and regions, in support of applications for various marine activities such as marine research, Oil spill…
View article: Retrieval of Hurricane Rain Rate From SAR Images Based on Artificial Neural Network
Retrieval of Hurricane Rain Rate From SAR Images Based on Artificial Neural Network Open
Spaceborne synthetic aperture radar (SAR) is gradually being applied to hurricane observation because of its all-weather, high-resolution observation capability. In particular, the retrieval of rain rate using SAR images holds significant …
View article: Remote Sensing of Ocean Dynamics Parameters by Wide‐Beam High‐Frequency Hybrid Sky‐Surface Wave Radar: Localization of Sea Surface Scattering Points and Decontamination of Semi‐Physical Ionosphere Phase
Remote Sensing of Ocean Dynamics Parameters by Wide‐Beam High‐Frequency Hybrid Sky‐Surface Wave Radar: Localization of Sea Surface Scattering Points and Decontamination of Semi‐Physical Ionosphere Phase Open
This study addresses the issue of locating the scattering points on the sea surface and rectifying the interference caused by the ionosphere phase in the remote sensing of ocean dynamics parameters. Wide‐beam high‐frequency hybrid sky‐surf…
View article: Climatology of Cloud Base Height Retrieved from Long-Term Geostationary Satellite Observations
Climatology of Cloud Base Height Retrieved from Long-Term Geostationary Satellite Observations Open
Cloud base height (CBH) is crucial for parameterizing the cloud vertical structure (CVS), but knowledge concerning the temporal and spatial distribution of CBH is still poor owing to the lack of large-scale and continuous CBH observations.…
View article: Correction of WindSat sea surface wind speed under rain
Correction of WindSat sea surface wind speed under rain Open
To improve the accuracy of sea surface wind speed under rain based on data obtained from the U.S. spaceborne fully polarimetric microwave radiometer (WindSat), a wind speed correction model based on a statistical algorithm is constructed. …
View article: Correction of ionosphere phase contamination of high‐frequency hybrid sky‐surface wave radar using wavelet transform
Correction of ionosphere phase contamination of high‐frequency hybrid sky‐surface wave radar using wavelet transform Open
Ionospheric phase contamination (IPC) is a major contributor to the imprecise retrieval of ocean dynamics parameters by the high‐frequency hybrid sky‐surface wave radar (HFHSSW). Since the direct wave and sea echo of HFHSSW have comparable…
View article: Evaluation of feature extraction algorithms for oceanic internal waves based on nighttime detection data of spaceborne low light imager
Evaluation of feature extraction algorithms for oceanic internal waves based on nighttime detection data of spaceborne low light imager Open
The day/night band channel on the JPSS series of satellites can detect the light and dark fringes of oceanic internal waves due to the reflectivity difference caused by the roughness of the sea surface under moon flare conditions. After op…
View article: Research on Sea Surface Elliptical Current Remote Sensing With Single-Station Wide-Beam High-Frequency Sky–Surface Wave Radar
Research on Sea Surface Elliptical Current Remote Sensing With Single-Station Wide-Beam High-Frequency Sky–Surface Wave Radar Open
This article describes a new elliptical current () retrieval scheme for single-station wide-beam high-frequency sky–surface wave radar, which focuses on solving the problem of locating scattering patches on the sea surface. To start with, …
View article: Sea surface temperature retrieval based on simulated space-borne one-dimensional multifrequency synthetic aperture microwave radiometry
Sea surface temperature retrieval based on simulated space-borne one-dimensional multifrequency synthetic aperture microwave radiometry Open
The space-borne one-dimensional multifrequency synthetic aperture microwave radiometer (1D-MSAMR) offers new possibilities for detecting high spatial resolution sea surface temperature (SST). To achieve higher SST retrieval accuracy, an SS…
View article: Correction of Sea Surface Wind Speed Based on SAR Rainfall Grade Classification Using Convolutional Neural Network
Correction of Sea Surface Wind Speed Based on SAR Rainfall Grade Classification Using Convolutional Neural Network Open
The technology of retrieving sea surface wind field from spaceborne synthetic aperture radar (SAR) is increasingly mature. However, the retrieval of the sea surface wind field related to the precipitation effect is still facing challenges,…
View article: Estimating Layered Cloud Cover from Geostationary Satellite Radiometric Measurements: A Novel Method and Its Application
Estimating Layered Cloud Cover from Geostationary Satellite Radiometric Measurements: A Novel Method and Its Application Open
Layered cloud cover (LCC), that is, cloud cover at different levels, is crucial for estimating cloud radiative effects and modeling climate change. However, accurate LCC characterization using passive satellite measurements is challenging …
View article: Effect of precipitation on synthetic aperture radar hurricane wind field retrieval
Effect of precipitation on synthetic aperture radar hurricane wind field retrieval Open
C-band synthetic aperture radar (SAR) with all-weather observation capability is gradually being used for the high-resolution observation of hurricane. The extreme wind speed in hurricanes is retrieved by combining the co- and cross-polari…
View article: Research on a Simulation Model of a Skywave Over-the-Horizon Radar Sea Echo Spectrum
Research on a Simulation Model of a Skywave Over-the-Horizon Radar Sea Echo Spectrum Open
The capability of a skywave over-the-horizon radar (SWR) to achieve the continuous observation of a wide range of ocean dynamics parameters via a single ionospheric reflection has been demonstrated by many scholars. In order to expand the …
View article: Sea Surface Wind Direction Retrieval Based on Convolution Neural Network and Wavelet Analysis
Sea Surface Wind Direction Retrieval Based on Convolution Neural Network and Wavelet Analysis Open
Sea surface wind streak is one of many geophysical phenomena in synthetic aperture radar (SAR) images, which is often used to obtain sea surface wind direction. At present, the recognition of wind streaks mainly depends on artificial exper…
View article: An Identification Method of Melting Layer Using the Covariance Wavelet Transform Based on GPM‐DPR Observations
An Identification Method of Melting Layer Using the Covariance Wavelet Transform Based on GPM‐DPR Observations Open
A knowledge of melting layer (ML) is crucial for studying precipitation and hydrometeor. Based on the measurements of dual‐frequency ratio (DFR m ) from the dual‐frequency precipitation radar on board the Global Precipitation Measurement s…
View article: Microphysics of Summer Precipitation Over Yangtze‐Huai River Valley Region in China Revealed by GPM DPR Observation
Microphysics of Summer Precipitation Over Yangtze‐Huai River Valley Region in China Revealed by GPM DPR Observation Open
Utilizing the measurements and retrievals from the Global Precipitation Measurement dual‐frequency precipitation radar data during the summer of 2014–2020, this study analyzes the precipitation microphysics for summer rainfall over the Yan…