A novel identification method for unrevealed mesoscale eddies with transient and weak features-Capricorn Eddies as an example

Li, Zhibing; Cai, Zheng-Li; Liu, Zhiqiang; Wang, Xiaohua; Hu, Jianyu

doi:10.1016/j.rse.2022.112981

Cited by 4 publications

(3 citation statements)

References 42 publications

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“…The calculation of band ratio was conducted using Landsat 8 OLI/TIRS images in November 2015, representing the temporal dimension for east-west transitional season, and in March 2016 for the eastwest transitional season. The temporal dimension is important to avoid the failure in detecting the visualization of distribution of sediment (Zhibing et al, 2022). The transitional season is essential to be considered because it means a seasonal anomaly that induces the different spread pattern of the suspended sediment rather than the other seasons (Kirono, 2004;Sunarto, 2000).…”

Section: Methodsmentioning

confidence: 99%

“…GIS utilization in this study was deemed effective because it had been applied in related studies in coastal areas and oceanography (Gopikumar et al, 2022;Nurrohmah et al, 2016;Septriayadi & Hamhaber, 2013;Zhibing et al, 2022). This study relied mainly on band ratio processing, part of GIS technology for the top atmospheric corrected imageries (Fig.…”

Section: Methodsmentioning

confidence: 99%

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Sequential Band-Ratio in Landsat 8 OLI/TIRS to Enhance the Suspended Sediment Direction Monitoring in Urban Coastal Area

Trihatmoko

Sartohadi

Marfai

et al. 2022

Preprint

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Various environmental processes as impacts of urban areas related to coastal dynamics require continuous monitoring using the Geographic Information System (GIS). Among such consequences, the spread pattern of suspended sediment in urban coastal areas indicates urban flood risk. This research aimed to determine the spread pattern of suspended sediment in the urban coastal area of Kendal Regency, Indonesia. The primary research method employed ENVI to analyze the sequential band-ratio from Landsat 7 TM to Landsat 8 OLI/TIRS satellite images. The results show that the distribution patterns effectively use band 3/2 of Landsat 8 OLI/TIRS with ca. 0.1 higher for the DN value compared to the band 4/3. This finding indicates different cases in other regions that mostly enhance the band ratio of 4/3 – sequentially match with band 3/2 in Landsat 7 TM. By receiving clear visualization from a band ratio of 3/2, the potential major distribution of suspended sediment was seen in the northeast during the west-east transitional season. However, the East-West's transitional season shows the sediment's circulation at certain points that could become the potential benchmark locations for the siltation occurrence because of sediment concentrations.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Sequential Band-Ratio in Landsat 8 OLI/TIRS to Enhance the Suspended Sediment Direction Monitoring in Urban Coastal Area

Trihatmoko

Sartohadi

Marfai

et al. 2022

Preprint

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“…Sweeping along the southern GBR margin, a clockwise oceanographic gyre, known as the Capricorn Eddy, is centred in the Capricorn Channel region in what is referred to as the 'Capricorn Wedge' (Church 1987;Weeks et al 2010). The Capricorn Eddy and East Australian Current (EAC), which is a broader and larger southwardflowing current, have an impact on the hydrodynamics of this region, causing tidal mixing and upwelling along the shelf edge (Weeks et al 2010;Zhibing et al 2022). The regional subtropical climate encompasses an average seasurface temperature of 21.5°C in the winter and 27°C in the summer, a mean yearly temperature of 24.5°C and mean annual rainfall of 1047 mm (Dechnik et al 2015).…”

Section: Regional Settingmentioning

confidence: 99%

Benthic communities of the lower mesophotic zone on One Tree shelf edge, southern Great Barrier Reef, Australia

Wright,

Beaman,

Daniell

et al. 2023

Mar. Freshw. Res.

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Context Increasing interest in mesophotic coral ecosystems has shown that reefs in deep water show considerable geomorphic and ecological variability among geographic regions. Aims We provide the first investigation of mesophotic reefs at the southern extremity of the Great Barrier Reef (GBR) to understand the biotic gradients and habitat niches in the lower mesophotic zone. Methods Multibeam data were used to target five benthic imagery transects collected in the lower mesophotic (80–130 m) zone from the shelf edge near One Tree Island (23°S, 152°E) by using a single HD-SDI subsea camera. Key results Transects supported similar benthic communities in depths of 80–110 m, with the abundance of sessile benthos declining below ~110 m where the shelf break grades into the upper continental slope. Conclusions The effect of the Capricorn Eddy may be promoting homogeneity of benthic assemblages, because it provides similar environmental conditions and potential for connectivity. Variation in benthic communities between hard and soft substrate and differing topographic relief within the study site are likely to be influenced by variation in sedimentation, including sensitivity to suspended particles. Implications This study highlighted that the lower mesophotic region on the One Tree shelf edge supports mesophotic coral ecosystems that vary depending on depth and substrate.

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Oceanic Mesoscale Eddy Fitting Using Legendre Polynomial Surface Fitting Model Based on Along-Track Sea Level Anomaly Data

Kong,

Zhang,

Shi

et al. 2024

Remote Sensing

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Exploring the spatial distribution of sea surface height involves two primary methodologies: utilizing gridded reanalysis data post-secondary processing or conducting direct fitting along-track data. While processing gridded reanalysis data may entail information loss, existing direct fitting methods have limitations. Therefore, there is a pressing need for novel direct fitting approaches to enhance efficiency and accuracy in sea surface height fitting. This study demonstrates the viability of Legendre polynomial surface fitting, benchmarked against bicubic quasi-uniform B-spline surface fitting, which has been proven to be a well-established direct fitting method. Despite slightly superior accuracy exhibited by bicubic quasi-uniform B-spline surface fitting under identical order combinations, Legendre polynomial surface fitting offers a simpler structure and enhanced controllability. However, it is pertinent to note that significant expansion of the spatial scope of fitting often results in decreased fitting efficacy. To address this, the current research achieves the precise fitting of sea surface height across expansive spatial ranges through a regional stitching methodology.

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A novel identification method for unrevealed mesoscale eddies with transient and weak features-Capricorn Eddies as an example

Cited by 4 publications

References 42 publications

Sequential Band-Ratio in Landsat 8 OLI/TIRS to Enhance the Suspended Sediment Direction Monitoring in Urban Coastal Area

Sequential Band-Ratio in Landsat 8 OLI/TIRS to Enhance the Suspended Sediment Direction Monitoring in Urban Coastal Area

Benthic communities of the lower mesophotic zone on One Tree shelf edge, southern Great Barrier Reef, Australia

Oceanic Mesoscale Eddy Fitting Using Legendre Polynomial Surface Fitting Model Based on Along-Track Sea Level Anomaly Data

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