Temporal and spatial variation of sea ice type in the Arctic is an indicator regional global change. can be classified into two major categories: multiyear (MYI) first-year ice. In this paper, classification method based on machine learning established applied to produce daily data set during winter (November-April) from 2002 2017 using active microwave QuikSCAT Advanced Scatterometer as well passive Microwave Scanning Radiometer for EOS, Special Sensor Imager/Sounder, 2 radiometer. First,...

Abstract The annual minimum Antarctic sea ice extent (SIE) in February 2022 hits a record low the satellite era, with less than 2 million square kilometres observed on 25 2022, contrasting slightly positive trend SIE prior to 2014. However, preceding Amundsen Sea Low (ASL) austral spring 2021 was deepest since 1950. According linear regression model, very ASL contributed about 60% 2022. This study further investigates underlying mechanism. investigation of lagged impact is based...

Mapping landfast sea ice at a fine spatial scale is not only meaningful for geophysical study, but also of benefit providing information about human activities upon it. The combination unmanned aerial systems (UAS) with structure from motion (SfM) methods have already revolutionized the current close-range Earth observation paradigm. To test their feasibility in characterizing properties and dynamics fast ice, three flights were carried out 2016–2017 austral summer during 33rd Chinese...

Although extensive studies have investigated changes in regional ecosystem services (ESs) under rapid urbanization, few analyses used high-resolution image data to investigate urban wetlands. Taking the Xixi wetland region as a case area, this study aimed temporal and spatial variation influencing factors of typical ESs during 1984–2018 using images. The results showed that underwent substantial land use well different ESs. While carbon storage presented an increasing trend from 223.25 t/ha...

As a result of global warming, multiyear ice (MYI) is being replaced by first-year (FYI) in the Arctic. Microwave scatterometers Ku-band and C-band can provide daily observations sea type. However, their comparative capabilities mapping type have not been thoroughly evaluated. We present systematic intercomparison backscatter signature VV polarization ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...

Sea ice adversely impacts nautical, logistical and scientific missions in polar regions. Ship navigation benefits from up-to-date sea analyses at both regional local scales. This study presents a satellite-based system (SatSINS) that integrates observations output remote sensing meteorological data to develop optimum marine navigational routes ice-covered waters, especially areas where operational information is usually scarce. The its applications are presented the context of...

The Northwest Passage (NWP) in the Arctic is usually covered with hazardous multi-year ice (MYI) and seasonal first-year (FYI) winter, possible thin open-water areas during transition seasons. Ice classification important for both marine navigation climate change studies. Satellite-based Synthetic Aperture Radar (SAR) systems have shown advantages of retrieving this information. Operational mapping relies on visual analysis SAR images along ancillary data. However, these maps estimate types...

Sea ice hinders the navigability of Arctic, especially in winter and spring. However, three Arc7 ice-class Liquefied Natural Gas carrying vessels safely transited Northern Route (NSR) without icebreaker assistance January 2021. More more are putting into transit services NSR. Therefore, it is necessary to analyze sea-ice conditions their impact on navigation during wintertime, future along NSR Based sea datasets from satellite observations a model using data assimilation, we explored first...

Abstract The North Water Polynya (NOW) is the largest recurrent Arctic coastal polynya. formation of NOW critically dependent on development an ice arch that defines its northern boundary. In this study, high‐resolution ENVISAT Advanced Synthetic Aperture Radar data, Sentinel‐1A and Moderate Resolution Imaging Spectroradiometer data were employed to identify spatio‐temporal characteristics during 2006–2019. pixels identified based thin thickness (TIT), using a threshold TIT &lt;0.2 m, from...

Tidal cracks are linear features that appear parallel to coastlines in fast ice regions due the actions of periodic and non-periodic sea level oscillations. They can influence energy heat exchange between ocean, ice, atmosphere, as well human activities. In this paper, LINE module Geomatics 2015 software was used automatically extract tidal near Chinese Zhongshan Station East Antarctica from Landsat-8 Operational Land Imager (OLI) data with resolutions 15 m (panchromatic band 8) 30...

Abstract During the 30th Chinese Antarctic Expedition in 2013/14, icebreaker RV Xuelong answered a rescue call from Russian Akademik Shokalskiy . While assisting repatriation of personnel vessel to Australian Aurora Australis , itself became entrapped within compacted ice Adélie Depression region. Analysis MODIS and SAR imagery provides detailed description regional sea-ice conditions which led 6 day long besetment The remotely sensed revealed four stages characteristics during entrapment:...

Landfast ice is an important component of the Antarctic sea ice. Its edge generally advances offshore to its annual maximum extent by mid-winter before retreating later in spring. This study presents automated method detect seaward landfast (SLIE) at beginning austral spring (October) for a region northeast Amery Ice Shelf, East Antarctic. Here, net gradient difference algorithm developed Mahoney [1] has been extended include medium detection automatically delineate SLIE using sequential SAR...

Abstract Arctic landfast sea ice (LFSI) represents an important quasi-stationary coastal zone. Its evolution is determined by the regional climate and bathymetry. This study investigated seasonal cycle interannual variations of LFSI along northwest coast Kotelny Island. Initial freezing, rapid formation, stable decay stages were identified in based on application visual inspection approach (VIA) to MODIS/Envisat imagery results from a thermodynamic snow/ice model. The modeled annual maximum...

Landfast ice plays an important role in atmosphere‒ocean interactions and ecosystems the near coast area of Antarctica. Understanding characteristics variations landfast is crucial to study climates field activities Antarctic. In this study, a high-resolution thermodynamic snow-ice (HIGHTSI) model was applied simulate seasonal changes along Mawson Coast, East Antarctica, through ERA-Interim reanalysis data. Four ocean heat-flux (Fw) values (10, 15, 20 25 W m−2) were used sensitivity...

The North Water Polynya (NOW) is the largest recurrent Arctic coastal polynya. formation of NOW critically dependent on development an ice arch that defines its northern boundary. In this study, high-resolution ENVISAT Advanced Synthetic Aperture Radar data, Sentinel-1A and Moderate Resolution Imaging Spectroradiometer data were employed to identify spatio-temporal characteristics during 2006&amp;#8211;2019. pixels identified based thin thickness (TIT), using a threshold TIT &lt;0.2 m, from...

Sea ice concentration (SIC) can be retrieved from thermal infrared (TIR) imagery due to the distinctive properties of and water. Nevertheless, existing TIR-based SIC algorithms rely on surface temperature data, which often introduces additional errors. To address this issue, we have developed a new TIR algorithm (TIRIA) that directly utilizes brightness temperatures. TIRIA considers factors such as seawater salinity, observation angle their impacts temperature. traditional algorithm, MODIS...

Continuous monitoring and assessment of satellite sensor radiometric response are crucial for timely detection anomaly the performance, especially operational optical sensors (e.g., FY-3D MERSI-II) beyond expected lifespan. Improving calibration coefficients ensures acquisition high-precision consistent observational Level 1 data records long time-series researches. To evaluate stability MERSI-II in reflective solar band, this study constructs parametric simplified nonsimplified Warren...