Zhuoqi Chen
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View article: Detection of weekly buried meltwater in Greenland Ice Sheet with Sentinel-1 imagery
Detection of weekly buried meltwater in Greenland Ice Sheet with Sentinel-1 imagery Open
Recent studies show that buried meltwater (BM) beneath the Greenland Ice Sheet (GrIS) can persist through winter, influencing the englacial hydrological system and thermal regime. However, previous research has primarily focused on annual …
View article: Glacier surface melt monitoring using Sentinel-1 SAR backscattering coefficient and polarimetric decomposition features at Greenland ice sheet
Glacier surface melt monitoring using Sentinel-1 SAR backscattering coefficient and polarimetric decomposition features at Greenland ice sheet Open
The synthetic aperture radar (SAR) imagery is sensitive to glacier melting because the dielectric constants vary when the ice surface melts. Previous studies mainly utilized the backscatter coefficients of SAR data. This study aims to expl…
View article: Integrated Retrieval of Surface and Atmospheric Variables in the Arctic From FY-3D MWRI With a Time-Constraint Optimal Estimation Method
Integrated Retrieval of Surface and Atmospheric Variables in the Arctic From FY-3D MWRI With a Time-Constraint Optimal Estimation Method Open
Integrated retrieval using the optimal estimation (OE) method iteratively finds a set of geographical parameters that best match the observations. However, this method becomes more challenging over the ice surface due to the highly sensiti…
View article: An assessment of the CMIP6 performance in simulating Arctic sea ice volume flux via Fram Strait
An assessment of the CMIP6 performance in simulating Arctic sea ice volume flux via Fram Strait Open
Numerical models serve as an essential tool to investigate the causes and effects of Arctic sea ice changes. Evaluating the simulation capabilities of the most recent CMIP6 models in sea ice volume flux provides references for model applic…
View article: Snow Cover Mapping From Chinese Geostationary Meteorological Satellite FY-2F VISSR-II Data Using Random Forest Classifier
Snow Cover Mapping From Chinese Geostationary Meteorological Satellite FY-2F VISSR-II Data Using Random Forest Classifier Open
Accurate monitoring of snow cover is essential for understanding climate dynamics and supporting hydrological and environmental management. The Fengyun-2F (FY-2F) satellite is one of China’s first geostationary meteorological satellites, e…
View article: Aromatase as a novel target of parabens in human and rat placentas: 3D-quantitative structure-activity relationship and docking analysis
Aromatase as a novel target of parabens in human and rat placentas: 3D-quantitative structure-activity relationship and docking analysis Open
Aromatase (CYP19A1), a pivotal enzyme in the biosynthesis of estradiol from testosterone, is predominantly expressed in reproductive tissues including placentas. This study investigated the effects of paraben acid and nine parabens on the …
View article: Impacts of GCP Distributions on UAV-PPK Photogrammetry at Sermeq Avannarleq Glacier, Greenland
Impacts of GCP Distributions on UAV-PPK Photogrammetry at Sermeq Avannarleq Glacier, Greenland Open
Real-Time/Post-Processing Kinematic (RTK/PPK) technology has been widely applied in Unmanned Aerial Vehicle (UAV) photogrammetry in glaciological research. Considering that ground control points (GCPs) cannot be set on glaciers, evaluating…
View article: Bisphenol H exposure disrupts Leydig cell function in adult rats via oxidative stress-mediated m6A modifications: Implications for reproductive toxicity
Bisphenol H exposure disrupts Leydig cell function in adult rats via oxidative stress-mediated m6A modifications: Implications for reproductive toxicity Open
Bisphenol H (BPH) has emerged as a potential alternative to bisphenol A (BPA), which has been curtailed for use due to concerns over its reproductive and endocrine toxicity. This study investigates whether BPH exerts antiandrogenic effects…
View article: Dexamethasone-loaded PLGA porous microspheres used as 3D-bioprinted bioink promote tissue-engineered cartilage regeneration
Dexamethasone-loaded PLGA porous microspheres used as 3D-bioprinted bioink promote tissue-engineered cartilage regeneration Open
The current investigation focused on fabricating and thoroughly analyzing porous microspheres (MPs) comprising poly (lactic-co-glycolic acid, PLGA) encapsulating dexamethasone, by utilizing the water-in-oil-in-water (W/O/W) emulsion solven…
View article: A new sea ice concentration retrieval algorithm from thermal infrared imagery
A new sea ice concentration retrieval algorithm from thermal infrared imagery Open
Sea ice concentration (SIC) can be retrieved from thermal infrared (TIR) imagery due to the distinctive thermal properties of ice and water. Nevertheless, existing TIR-based SIC algorithms rely on surface temperature data, which often intr…
View article: An assessment of the CMIP6 performance in simulating Arctic sea ice volume flux via Fram Strait
An assessment of the CMIP6 performance in simulating Arctic sea ice volume flux via Fram Strait Open
Numerical models serve as an essential tool to investigate the causes and effects of Arctic sea ice changes. Evaluating the simulation capabilities of the most recent CMIP6 models in sea ice volume flux provides references for model applic…
View article: A New Sea Ice Type Concentration Retrieval Algorithm from Microwave Remote Sensing Data
A New Sea Ice Type Concentration Retrieval Algorithm from Microwave Remote Sensing Data Open
Sea ice types, e.g., first-year ice (FYI) and multi-year ice (MYI), can be discriminated based on their radiometric and scattering signatures. However, changes in ice surfaces caused by factors such as ice deformation and melt-refreeze eve…
View article: Sea Ice Drift Retrieval based on Fengyun-3D Multi-Sensor Data
Sea Ice Drift Retrieval based on Fengyun-3D Multi-Sensor Data Open
Under the background of global warming, sea ice changes rapidly. Sea ice drift is an important indicator for sea ice flux, atmospheric and ocean circulation, and ship navigation. Currently, the large-scale observed sea ice drift datasets a…
View article: Arctic sea ice drift fields extraction based on feature tracking to MODIS imagery
Arctic sea ice drift fields extraction based on feature tracking to MODIS imagery Open
Moderate-resolution optical imagery holds great potential in deriving Arctic sea ice drift fields because of its higher resolution than microwave radiometers and scatterometers, as well as its larger swath widths than most other optical an…
View article: Time-series Surface Velocity Extraction of Petermann Glacier based on Sentinel-1 Pixel Offset-tracking and Iterative SVD
Time-series Surface Velocity Extraction of Petermann Glacier based on Sentinel-1 Pixel Offset-tracking and Iterative SVD Open
格陵兰冰盖流速监测对定量估算冰盖物质损失以及研究冰盖对全球变暖的响应具有重要意义。利用SAR影像强度信息进行偏移量追踪是目前冰川流速监测的主要方法。冰川表面散射特性的变化会导致SAR影像强度信息发生改变,导致影像匹配失相关,从而造成提取的流速场中存在大量错误与空洞。为了克服该问题,本文提出了一套基于Sentinel-1 SAR影像提取冰川流速时序的数据处理流程:通过开运算、连通性分析、自适应中值滤波等方法去除单对追踪影像中的噪声与错误;同时利用现有产品的年度和月度平均流速数…
View article: Sea ice drift vectors extraction based on feature tracking to Sentinel-1 images
Sea ice drift vectors extraction based on feature tracking to Sentinel-1 images Open
海冰漂移对北极气候研究和人类活动保障有重要意义。对星载辐射计或散射计数据采用模板匹配法提取的海冰漂移矢量结果存在空间分辨率较低及精度不佳等问题。合成孔径雷达(SAR)影像具有更高的空间分辨率,结合特征匹配算法可用于提取高分辨率海冰漂移场。本文采用Sentinel-1影像为数据源,比较了四种常用的特征匹配算子SIFT、SURF、ORB、A-AKZE提取北极海冰漂移矢量的效果,并分析了HH与HV极化通道提取的漂移矢量提取的空间分布差异。针对特征匹配中不可避免的错误,结合既有算法…
View article: An improvement in accuracy and spatial resolution of the pattern-matching sea ice drift from SAR imagery
An improvement in accuracy and spatial resolution of the pattern-matching sea ice drift from SAR imagery Open
Sea ice drift is a crucial parameter for sea ice flux, atmospheric and ocean circulation, and ship navigation. Pattern matching is widely used to retrieve sea ice drift from Synthetic Aperture Radar (SAR) data, but it often yields mismatch…
View article: Assessing CMIP6 simulations of Arctic sea ice drift: Role of near-surface wind and surface ocean current in model performance
Assessing CMIP6 simulations of Arctic sea ice drift: Role of near-surface wind and surface ocean current in model performance Open
Sea ice drift is a critical parameter for understanding the rapid changes in Arctic sea ice. Since the release of the Coupled Model Intercomparison Project Phase 6 (CMIP6), there has been a lack of quantitative analysis regarding CMIP6's s…
View article: Glacier melt detection at different sites of Greenland ice sheet using dual-polarized Sentinel-1 images
Glacier melt detection at different sites of Greenland ice sheet using dual-polarized Sentinel-1 images Open
Synectic Aperture Radar (SAR) backscatter coefficient is sensitive to glacier surface physical characteristic changes, including the states of melting and refreezing, but it is also sensitive to incidence angle variation. This study explor…
View article: Monitoring ice flow velocity of Petermann glacier combined with Sentinel-1 and −2 imagery
Monitoring ice flow velocity of Petermann glacier combined with Sentinel-1 and −2 imagery Open
Synthetic Aperture Radar (SAR) images are commonly used to monitor glacier flow velocity at Greenland Ice Sheet (GrIS). However, offset-tracking with SAR imagery in summer usually show poor quality because the rapid ice surface freezing-me…
View article: Arctic sea ice drift fields extraction based on feature tracking to MODIS imagery
Arctic sea ice drift fields extraction based on feature tracking to MODIS imagery Open
Moderate-resolution optical imagery holds great potential in deriving Arctic sea ice drift fields because of its higher resolution than microwave radiometers and scatterometers, as well as its larger swath widths than most other optical an…
View article: On the turbulent heat fluxes: A comparison among satellite-based estimates, atmospheric reanalyses, and in-situ observations during the winter climate over Arctic sea ice
On the turbulent heat fluxes: A comparison among satellite-based estimates, atmospheric reanalyses, and in-situ observations during the winter climate over Arctic sea ice Open
The surface energy budget is crucial for Arctic sea ice mass balance calculation and climate systems, among which turbulent heat fluxes significantly affect the air–sea exchanges of heat and moisture in the atmospheric boundary layer. Sate…
View article: Mass Balance of the Antarctic Ice Sheet in the Early 21st Century
Mass Balance of the Antarctic Ice Sheet in the Early 21st Century Open
Mass loss from the Antarctic Ice Sheet (AIS) is an important contributor to global sea level rise. To examine the recent ice loss, we estimated the mass budget of the AIS from 2000 to 2020 using multiple ice velocity datasets, state-of-the…
View article: Merged Sea Ice Motion from Pattern-Matching and Feature-Tracking Vectors
Merged Sea Ice Motion from Pattern-Matching and Feature-Tracking Vectors Open
<p>Under the background of global warming, sea ice changes rapidly. Sea ice drift is an important indicator for sea ice flux, atmospheric and ocean circulation, and ship navigation. Considering that pattern-matching vectors and featu…
View article: Arctic sea ice type distribution from various microwave remote sensing products
Arctic sea ice type distribution from various microwave remote sensing products Open
<p>Arctic sea ice type (SITY) variation is a sensitive indicator of climate change. This study analyzed eight daily SITY products from five retrieval approaches covering the winters of 1999&#8211;2019, including purely radiometer…
View article: A Simplified Coastline Inflection Method for Correcting Geolocation Errors in FengYun-3D Microwave Radiation Imager Images
A Simplified Coastline Inflection Method for Correcting Geolocation Errors in FengYun-3D Microwave Radiation Imager Images Open
Passive microwave (PMW) sensors are popularly applied to Earth observations. However, the satellite PMW radiometer data sometimes have non-negligible errors in geolocation. Coastline inflection methods (CIMs) are widely used to improve geo…
View article: Inter-comparison and evaluation of Arctic sea ice type products
Inter-comparison and evaluation of Arctic sea ice type products Open
Arctic sea ice type (SITY) variation is a sensitive indicator of climate change. However, systematic inter-comparison and analysis for SITY products are lacking. This study analysed eight daily SITY products from five retrieval approaches …
View article: Evaluation of the AMSR2 Ice Extent at the Arctic Sea Ice Edge Using an SAR-Based Ice Extent Product
Evaluation of the AMSR2 Ice Extent at the Arctic Sea Ice Edge Using an SAR-Based Ice Extent Product Open
Passive microwave (PM) and synthetic aperture radar (SAR) observations are essential tools for providing long time series of sea-ice cover information, including sea-ice concentration (SIC) and sea-ice extent (SIE). Large uncertainties hav…