Xianqiang He
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View article: Spatiotemporal patterns and driving factors of nitrogen concentrations in Daya bay via remote sensing
Spatiotemporal patterns and driving factors of nitrogen concentrations in Daya bay via remote sensing Open
Excessive nitrogen concentrations may degrade coastal ecosystems, potentially causing harmful algae blooms and hypoxia. Total nitrogen (TN) and dissolved inorganic nitrogen (DIN) are key indicators for assessing external nitrogen loads and…
View article: Divergent hemispheric trends in marine dust deposition over the past two decades
Divergent hemispheric trends in marine dust deposition over the past two decades Open
View article: Assessing the Long-Term Changes in the Suspended Particulate Matter in Hangzhou Bay Using MODIS/Aqua Data
Assessing the Long-Term Changes in the Suspended Particulate Matter in Hangzhou Bay Using MODIS/Aqua Data Open
Hangzhou Bay (HZB) has become a hot spot in hydro-morphodynamic research due to human impacts and natural influences, as well as the substantial quantities of water discharge and sediment load of the Yangtze River and Qiantang River. Altho…
View article: Design and Series Product Development of a Space-Based Dyson Spectrometer for Ocean Applications
Design and Series Product Development of a Space-Based Dyson Spectrometer for Ocean Applications Open
An advanced Dyson spectrometer is proposed that redesigns the Dyson prism to make the entire system coaxial and easy to implement for each subassembly, thus greatly enhancing optical design, optical processing, and system alignment. The de…
View article: Data fusion-based improvements in empirical regression and machine learning for global daily ∼ 8 km resolution sea surface nitrate estimation and interpretation
Data fusion-based improvements in empirical regression and machine learning for global daily ∼ 8 km resolution sea surface nitrate estimation and interpretation Open
Assessing sea surface nitrate (SSN) concentrations and dynamics is crucial for understanding marine ecosystem health, yet optical remote sensing of SSN remains challenging because of the lack of distinct spectral features. While various gl…
View article: Design and Optimization Analysis of a Multipoint Flexible Adhesive Support Structure for a Spaceborne Rectangular Curved Prism
Design and Optimization Analysis of a Multipoint Flexible Adhesive Support Structure for a Spaceborne Rectangular Curved Prism Open
Curved prisms can serve as core components of dispersive spectroscopy and converge light paths, making them widely used in spectral imaging technology. Their positional stability, surface shape errors, and temperature stability in optical …
View article: Development of the operational atmospheric correction algorithm for the COCTS2 onboard the Chinese new-generation ocean color satellite
Development of the operational atmospheric correction algorithm for the COCTS2 onboard the Chinese new-generation ocean color satellite Open
After the two operational polar-orbiting ocean color satellites HY-1C and HY-1D launched in 2018 and 2020, respectively, China launched the new-generation ocean color observation satellite (named as HY-1E or HY-3A, hereafter called HY-1E) …
View article: Ubiquitin-like protein-mediated sulfur trafficking facilitates hyperthermophile dispersal in sulfur-limited environments
Ubiquitin-like protein-mediated sulfur trafficking facilitates hyperthermophile dispersal in sulfur-limited environments Open
While hyperthermophilic archaea thriving in hydrothermal vent ecosystems have been extensively studied for their remarkable adaptations to geochemical extremes, the molecular underpinnings of their dispersal strategies remain enigmatic. Ce…
View article: Diversity mechanisms of long-term changes in phytoplankton biomass and productivity in the Southern Ocean: comparison in the Amundsen and Cosmonaut Seas
Diversity mechanisms of long-term changes in phytoplankton biomass and productivity in the Southern Ocean: comparison in the Amundsen and Cosmonaut Seas Open
Introduction Global warming and glacier melt are transforming Southern Ocean ecosystems, profoundly affecting phytoplankton dynamics. This study investigates long-term phytoplankton changes in the Amundsen and Cosmonaut Seas, focusing on r…
View article: Prediction of Sea Surface Chlorophyll-a Concentrations by Remote Sensing and Deep Learning
Prediction of Sea Surface Chlorophyll-a Concentrations by Remote Sensing and Deep Learning Open
Accurate prediction of the spatiotemporal distribution of chlorophyll-a (Chl-a) is essential for evaluating marine ecosystem health and predicting ecological disasters. Current methods struggle to capture short-term variability and periodi…
View article: Design and Construction of UAV-Based Measurement System for Water Hyperspectral Remote-Sensing Reflectance
Design and Construction of UAV-Based Measurement System for Water Hyperspectral Remote-Sensing Reflectance Open
Acquiring a large number of in situ water spectral measurements is fundamental for constructing water color remote-sensing retrieval models and validating the accuracy of water color remote-sensing products. However, traditional manual sit…
View article: Gain analysis of the configuration of energy storage for basin hydro-wind-photovoltaic integrated energy base
Gain analysis of the configuration of energy storage for basin hydro-wind-photovoltaic integrated energy base Open
View article: Satellite‐Estimation of the Global Ocean Primary Productivity via BGC‐Argo Measurements
Satellite‐Estimation of the Global Ocean Primary Productivity via BGC‐Argo Measurements Open
Monitoring the global ocean net primary productivity (NPP) has been the primary objective of satellite ocean color remote sensing since the launch of the world's first satellite ocean color sensor in 1978. However, considerable discrepanci…
View article: Impact of the Uncertainties of Polarized Water-Leaving Radiance on the Retrieval of Oceanic Constituents and Inherent Optical Properties in Global Oceans via Multiangle Polarimetric Observations
Impact of the Uncertainties of Polarized Water-Leaving Radiance on the Retrieval of Oceanic Constituents and Inherent Optical Properties in Global Oceans via Multiangle Polarimetric Observations Open
Compared with traditional single-view and radiometric-only observations, multiangle polarimetric observations of water-leaving radiation play a crucial role in enhancing the retrieval of ocean constituents and aerosol microphysical propert…
View article: Retrieving oceanic constituents and inherent optical properties in global oceans using multi-angular polarimetric measurements
Retrieving oceanic constituents and inherent optical properties in global oceans using multi-angular polarimetric measurements Open
Multi-angle polarization characteristics of water-leaving radiation are crucial for the retrieval of the oceanic constituents and the inherent optical properties (IOPs). However, the feasibility of using the polarization spectrum to retrie…
View article: Restoration of missing ocean color data in high-latitude oceans using neural network model
Restoration of missing ocean color data in high-latitude oceans using neural network model Open
Satellite ocean color remote sensing plays a crucial role in monitoring marine environment at both regional and global scales. However, due to the reduced accuracy of atmospheric correction models under large solar zenith angles (≥70°), pu…
View article: Impacts of IOD and ENSO on the phytoplankton’s vertical variability in the Northern Indian Ocean
Impacts of IOD and ENSO on the phytoplankton’s vertical variability in the Northern Indian Ocean Open
The Indian Ocean Dipole (IOD) and El Niño–Southern Oscillation (ENSO) are the primary climatic modes that profoundly impact physical and biological processes in the Northern Indian Ocean (NIO). IOD- and ENSO-related vertical phytoplankton …
View article: Satellite estimation of the spectral power exponent of particulate backscattering coefficient in the global ocean
Satellite estimation of the spectral power exponent of particulate backscattering coefficient in the global ocean Open
The spectral power exponent of the particulate backscattering coefficient ( b bp ), η , is a crucial parameter for assessing particle size distribution in the ocean, particularly for high-precision estimation of marine biogeochemical cycle…
View article: Monitoring Dissolved Organic Carbon Concentration and Flux in the Qiantang Riverine System Using Sentinel-2 Satellite Images
Monitoring Dissolved Organic Carbon Concentration and Flux in the Qiantang Riverine System Using Sentinel-2 Satellite Images Open
Real-time monitoring of riverine-dissolved organic carbon (DOC) and its controlling factors is critical for formulating strategies regarding the river basin and marginal seas pollution prevention and control. In this study, we established …
View article: Characterization of Landsat-8 and Landsat-9 Reflectivity and NDVI Continuity Based on Google Earth Engine
Characterization of Landsat-8 and Landsat-9 Reflectivity and NDVI Continuity Based on Google Earth Engine Open
The successful launch of Landsat-9 in 2020 ensures the continuity of Landsat Earth observation data. However, before Landsat-9 data can be effectively used in conjunction with Landsat-8, it is necessary to consider the differences between …
View article: Impact of sea surface waves and bubbles on water-leaving reflectance using Monte Carlo simulations
Impact of sea surface waves and bubbles on water-leaving reflectance using Monte Carlo simulations Open
Bubbles formed in the upper layers of the sea surface due to wave breaking caused by strong winds significantly alter the radiative properties of seawater. These changes affect the water-leaving radiance recorded by a satellite or airborne…
View article: Remote sensing estimates of global sea surface nitrate: Methodology and validation
Remote sensing estimates of global sea surface nitrate: Methodology and validation Open
Information about sea surface nitrate (SSN) concentrations is crucial for estimating oceanic new productivity and for carbon cycle studies. Due to the absence of optical properties in SSN and the intricate relationships with environmental …
View article: Constant power adaptive control of photovoltaic generator unit considering equivalent charge state
Constant power adaptive control of photovoltaic generator unit considering equivalent charge state Open
To address the impact of factors such as light intensity, temperature, equipment aging, and faults on the power output stability of photovoltaic power generation units during operation, a constant power adaptive control method for photovol…
View article: Research on the impact of cascade water light storage complementary power generation on water rate
Research on the impact of cascade water light storage complementary power generation on water rate Open
Fully leveraging the regulatory role of cascade hydropower in the watershed and achieving complementary joint power generation of cascade water solar systems is an important way to promote the consumption of clean energy. The article takes…
View article: Satellite retrievals of water quality for diverse inland waters from Sentinel-2 images: An example from Zhejiang Province, China
Satellite retrievals of water quality for diverse inland waters from Sentinel-2 images: An example from Zhejiang Province, China Open
Due to its advantages of high spatiotemporal resolution, long-term stable observation, and historical retrospective data, satellite remote sensing has extensive application in the dynamic monitoring of water quality in coastal and inland w…
View article: The importance of global synchronous observation for estimating oceanic chlorophyll-a
The importance of global synchronous observation for estimating oceanic chlorophyll-a Open
Over the last three decades, ocean color satellites have recorded continuous change in phytoplankton concentration, and in doing so, the satellites have helped marine remote sensing to become an emerging discipline. However, ocean color sa…
View article: Monitoring Dissolved Oxygen Concentrations in the Coastal Waters of Zhejiang Using Landsat-8/9 Imagery
Monitoring Dissolved Oxygen Concentrations in the Coastal Waters of Zhejiang Using Landsat-8/9 Imagery Open
The Zhejiang coastal waters (ZCW), which exhibit various turbidity levels, including low, medium, and high turbidity levels, are vital for regional ecological balance and sustainable marine resource utilization. Dissolved oxygen (DO) signi…
View article: A new merged dataset of global ocean chlorophyll-a concentration for better trend detection
A new merged dataset of global ocean chlorophyll-a concentration for better trend detection Open
Chlorophyll-a concentration (Chla) is recognized as an essential climate variable and is one of the primary parameters of ocean-color satellite products. Ocean-color missions have accumulated continuous Chla data for over two decades since…
View article: An enhanced large-scale benthic reflectance retrieval model for the remote sensing of submerged ecosystems in optically shallow waters
An enhanced large-scale benthic reflectance retrieval model for the remote sensing of submerged ecosystems in optically shallow waters Open
Shallow water benthic habitats have been significantly degraded and seriously threatened by intensifying climate changes and anthropogenic stressors. Benthic reflectance (Rbλ) of optically shallow waters (OSWs) is a key parameter for remot…
View article: Trends in Concentration and Flux of Total Suspended Matter in the Irrawaddy River
Trends in Concentration and Flux of Total Suspended Matter in the Irrawaddy River Open
Large rivers without hydrological data from remote sensing observations have recently become a hot research topic. The Irrawaddy River is among the major tropical rivers worldwide; however, published hydrological data on this river have ra…