Investigating mesoscale eddy characteristics in the Luzon Strait region using altimetry

Trott, Corinne B.; Metzger, E. Joseph; Yu, Zhitao

doi:10.1007/s10236-021-01460-1

Cited by 6 publications

(6 citation statements)

References 98 publications

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“…However, their correlation with observations was not more than 0.4, and there was still much room for improvement. From the perspective of the proportion of the three intrusion paths, leaking had the highest proportion, which was consistent with the previous research conclusions [64][65][66]. The number of looping and leaping events of CTR was significantly higher than that of observation, while the proportion of leaking was low.…”

Section: Kuroshio Intrusion In Luzon Straitsupporting

confidence: 90%

Impact of Correction Target Selection on Long-Term Spectral Nudging in Luzon Strait and Its Adjacent Regions

Fu,

He,

Zhao

et al. 2023

JMSE

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Previous studies have pointed out that spectral nudging is still insufficient in improving the long-term simulation ability of numerical models. In response to this problem, this study started with the Luzon Strait and its adjacent areas and discussed the influence of the selection of correction targets on its long-term spectral nudging. We established two sets of numerical experiments with the same parameter configuration except for the correction target: one was the monthly climatological target, and the other was the monthly real-time. The results showed that, compared with the climatology, the real-time target improved the consistency with the observations in large-scale variability on the premise of ensuring the correction of the climatological bias of the model. Further verification of the real-time scheme better simulated the meso- and small-scale characteristics, especially more accurately reproducing the position, intensity, and movement trend of eddies when the Kuroshio intrusion event occurred. Multi-scale energy analysis revealed the significance of adjusting large-scale potential energy to improve the overall simulation ability. The premise is that the correction target needs to fully contain these effective large-scale signals and non-stationary features, and then introduce them into the numerical integration of the regional model through appropriate band-pass filter parameter settings, driving a more reasonable large-scale background state thereby.

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Section: Kuroshio Intrusion In Luzon Straitsupporting

confidence: 90%

Impact of Correction Target Selection on Long-Term Spectral Nudging in Luzon Strait and Its Adjacent Regions

Fu,

He,

Zhao

et al. 2023

JMSE

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“…As an indicator of eddy activity, EKE appears local maxima in the subtropical area of the northwest Pacific Ocean (east of Taiwan), and eddies are also active in a broad region from the western Luzon Strait to the northern part of the South China Sea (Figure 6c), while the relatively weak EKE occupies the west of Luzon Island. The properties of these EKE horizontal distributions have been demonstrated in previous studies [49,50]. However, we observe that the low eddy kinetic energy appears in the eastern Luzon Strait (roughly located near the island chain between 19 • N and 22 • N, 121 • E and 122 • E), which produced an evident discrepancy of magnitude from EKE on both sides of the strait.…”

Section: Multiscale Energysupporting

confidence: 80%

“…According to the statistical results of Feng et al and Trott et al on the eddy in the northeast of South China Sea, the eddy activity here is also frequent [35,50]. Figure 14d reveals that the energy transfer of SCS subregion (northeastern part of South China Sea) prevailingly occurs between the climatological and eddy windows.…”

Section: Energy Pathway and Discussionmentioning

confidence: 76%

“…Secondly, there are intense seasonal variations in these subregions, which need to be classified as an independent scale window. Finally, considering the limited lifespans of eddies in the Luzon Strait and its adjacent areas [35,49,50], interference of information at other scales to the decomposition process should be reduced. In summary, MWT is used to decompose the original data into three scale windows: climatologicalscale window (period > 448 days), seasonal-scale window (period between 112 days and 448 days) and eddy window (period < 112 days).…”

Section: Scale Decompositionmentioning

confidence: 99%

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Multiscale Energy Transfers and Conversions of Kuroshio in Luzon Strait and Its Adjacent Regions

Zhao

et al. 2022

JMSE

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Using the local multiscale energy and vorticity analysis (MS-EVA) and based on the global high-resolution ocean reanalysis product GLORYS12V1 for 20 years, this study investigates the energy transfers and conversions of Kuroshio in the Luzon Strait and its adjacent regions through three scales, namely, the climatological scale, the seasonal scale, and the eddy scale. The results show that the inverse cascades of kinetic energy dominate the energy transfer east of Luzon (at both the eddy and seasonal scales). Kuroshio transfers the climatological kinetic energy to the eddy scale through a forward energy cascade in Luzon Strait and east of Taiwan. Because the topography of Luzon Strait and Kuroshio jointly block and limit the westward propagation of non-local eddies, the eddy energy in the South China Sea west of Luzon Strait tends to depend on local forward potential energy cascades. In these subregions, potential energy drives the accumulation of kinetic energy under the action of buoyancy conversion: interannual (seasonal) potential energy as the source of multiscale energy in the Luzon Strait (the east of Taiwan).

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“…A cost function was applied in between timesteps (in this case of length one day) to follow the path of the most statistically similar eddy throughout its full trajectory. The cost function can be found in more detail in [44]. Amplitudes are defined as the absolute value of the difference in value between the center and edge.…”

Section: Methodsmentioning

confidence: 99%

Tracking Loop Current Eddies in the Gulf of Mexico Using Satellite-Derived Chlorophyll-a

Trott,

Subrahmanyam,

Hiron

et al. 2024

Remote Sensing

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During the period of 2018–2022, there were six named Loop Current Eddy (LCE) shedding events in the central Gulf of Mexico (GoM). LCEs form when a large anticyclonic eddy (AE) separates from the main Loop Current (LC) and propagates westward. In doing so, each LCE traps and advects warmer, saltier waters with lower Chlorophyll-a (Chl-a) concentrations than the surrounding Gulf waters. This difference in water mass permits the study of the effectiveness of using Chl-a from satellite-derived ocean color to identify LCEs in the GoM. In this work, we apply an eddy-tracking algorithm to Chl-a to detect LCEs, which we have validated against the traditional sea surface height-(SSH) based eddy-tracking approach with three datasets. We apply a closed-contour eddy-tracking algorithm to the SSH of two model products (HYbrid Coordination Ocean Model; HYCOM and Nucleus for European Modelling of the Ocean; NEMO) and absolute dynamic topography (ADT) from altimetry, as well as satellite-derived Chl-a data to identify the six named LCEs from 2018 to 2022. We find that Chl-a best characterizes LCEs in the summertime due to a basin-wide increase in the horizontal gradient of Chl-a, which permits a more clearly defined eddy edge. This study demonstrates that Chl-a can be effectively used to identify and track LC and LCEs in the GoM, serving as a promising source of information for regional data assimilative models.

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Investigating mesoscale eddy characteristics in the Luzon Strait region using altimetry

Cited by 6 publications

References 98 publications

Impact of Correction Target Selection on Long-Term Spectral Nudging in Luzon Strait and Its Adjacent Regions

Impact of Correction Target Selection on Long-Term Spectral Nudging in Luzon Strait and Its Adjacent Regions

Multiscale Energy Transfers and Conversions of Kuroshio in Luzon Strait and Its Adjacent Regions

Tracking Loop Current Eddies in the Gulf of Mexico Using Satellite-Derived Chlorophyll-a

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