Dynamical Controls of the Eastward Transport of Overwintering <i>Calanus finmarchicus</i> From the Lofoten Basin to the Continental Slope

Dong, Huizi; Zhou, Meng; Smith, Walker O; Li, Baosheng; Hu, Zheng; Basedow, Sünnje Linnéa; Gaardsted, Frank; Zhang, Zhaoru; Zhong, Yisen

doi:10.1029/2022jc018909

Cited by 3 publications

(2 citation statements)

References 79 publications

(135 reference statements)

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“…Energetics analysis has been commonly used to reveal regional dynamic mechanisms. The Lorenz energy cycle (Lorenz, 1955) is an effective approach to investigating the variability of a current system and quantitatively describing energy transfer among reservoirs, providing insights into the underlying ocean dynamics (e.g., Dong et al., 2022; Ivchenko et al., 1997; Kang & Curchitser, 2015; Rieck et al., 2015; von Storch et al., 2012). It has been extensively employed in analyzing energetics in the Southern Ocean (e.g., Chen et al., 2014, 2016; G. Fu et al., 2023; Youngs et al., 2017).…”

Section: Methodsmentioning

confidence: 99%

Strong Eddy Kinetic Energy Anomalies Induced by Baroclinic Instability in the Southwest Region of the Kerguelen Plateau, East Antarctica

He,

Zhou,

Kang

2024

JGR Oceans

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Eddy activity is particularly prominent in the Southern Ocean due to the instabilities of the Antarctic Circumpolar Current, which plays a critical role in energy transport of the global ocean. In this study, a systematic energetics analysis framework is employed to investigate notable anomalies of an intensified Eddy Kinetic Energy (EKE) event observed in the southwest region of the Kerguelen Plateau in the Indian sector of the Southern Ocean in 2017, utilizing a reanalysis product. The EKE anomalies, presenting across all depths, emerged in April, peaked during the austral winter, and persisted into the subsequent summer. Energetics analysis indicates that the pronounced EKE anomalies are primarily determined by baroclinic instability, with distinct governing mechanisms at the surface and in the internal ocean. The anomalous intrusion of warm Circumpolar Deep Water intensified the baroclinic energy conversion in the subsurface, contributing significantly to the EKE anomalies. Moreover, strong anomalous wind‐induced Ekman pumping served to amplify the lifting of isopycnals, which enhanced the baroclinic instability and subsequently intensified the EKE anomalies. This study sheds new light on underlying mechanisms governing local polar dynamics and provides insights into the intricate interaction between ocean dynamics and energy distribution in the Antarctic region.

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Section: Methodsmentioning

confidence: 99%

Strong Eddy Kinetic Energy Anomalies Induced by Baroclinic Instability in the Southwest Region of the Kerguelen Plateau, East Antarctica

He,

Zhou,

Kang

2024

JGR Oceans

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“…Energetics analysis has been commonly used to reveal regional dynamic mechanisms. It's an effective approach to investigating the variability of a current system [e.g., Lorenz, 1955;Ivchenko et al, 1997;von Storch et al, 2012;Chen et al, 2014;Rieck et al, 2015;Kang et al, 2016;Dong and Zhou, 2022]. In this study, we employ the energetics analysis framework developed by Kang and Curchitser [2015] to explore the possible mechanism of an anomalous EKE event within the study area.…”

Section: Methodsmentioning

confidence: 99%

Strong Eddy Kinetic Energy Anomalies Induced by Baroclinic Instability in the Southwest Region of the Kerguelen Plateau,East Antarctic

He,

Zhou,

Kang

2023

Preprint

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Eddy activities are particularly prominent in the Southern Ocean due to the instabilities of the Antarctic Circumpolar Current (ACC), which plays a critical role in energy transport of the global ocean. The Indian sector of the Southern Ocean is not only a typical eddy-rich region with strong Eddy Kinetic Energy (EKE) and associated energy conversions among different energy reservoirs (kinetic energy and potential energy of the eddy and mean flow), but also events of extreme EKE. In this study, a systematic energetics analysis framework is employed to examine the notable anomalies of an intensified EKE event observed in the southwest region of the Kerguelen Plateau in 2017 based on a reanalysis product. The EKE anomaly existing at all depths emerges in April, reaches its peak during the austral winter, and persists into the following summer. Energetics analysis indicates that the strong anomalous EKE is primarily determined by baroclinic instability, with distinct governing mechanisms at the surface and in the internal ocean. The anomalous intrusion of warm Circumpolar Deep Water intensifies the baroclinic energy conversion in the subsurface, which contributes to the observed EKE anomalies. Moreover, the anomalous strong wind-induced Ekman pumping serves to amplify the lifting of isopycnals, which enhances the baroclinic instability and subsequently intensifies the EKE anomalies. This study sheds new light on underlying mechanisms governing local polar dynamics and provides insights into the intricate interaction between ocean dynamics and energy distribution in the Antarctic.

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Surface chlorophyll anomalies induced by mesoscale eddy-wind interactions in the northern Norwegian Sea

et al. 2022

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The substantial productivity of the northern Norwegian Sea is closely related to its strong mesoscale eddy activity, but how eddies affect phytoplankton biomass levels in the upper ocean through horizontal and vertical transport-mixing has not been well quantified. To assess mesoscale eddy induced ocean surface chlorophyll-a concentration (CHL) anomalies and modulation of eddy-wind interactions in the region, we constructed composite averaged CHL and wind anomalies from 3,841 snapshots of anticyclonic eddies (ACEs) and 2,727 snapshots of cyclonic eddies (CEs) over the period 2000-2020 using satellite altimetry, scatterometry, and ocean color products. Results indicate that eddy pumping induces negative (positive) CHL anomalies within ACEs (CEs), while Ekman pumping caused by wind-eddy interactions induces positive (negative) CHL anomalies within ACEs (CEs). Eddy-induced Ekman upwelling plays a key role in the unusual positive CHL anomalies within the ACEs and results in the vertical transport of nutrients that stimulates phytoplankton growth and elevated productivity of the region. Seasonal shoaling of the mixed layer depth (MLD) results in greater irradiance levels available for phytoplankton growth, thereby promoting spring blooms, which in combination with strong eddy activity leads to large CHL anomalies in May and June. The combined processes of wind-eddy interactions and seasonal shallowing of MLD play a key role in generating surface CHL anomalies and is a major factor in the regulation of phytoplankton biomass in the northern Norwegian Sea.

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Dynamical Controls of the Eastward Transport of Overwintering Calanus finmarchicus From the Lofoten Basin to the Continental Slope

Cited by 3 publications

References 79 publications

Strong Eddy Kinetic Energy Anomalies Induced by Baroclinic Instability in the Southwest Region of the Kerguelen Plateau, East Antarctica

Strong Eddy Kinetic Energy Anomalies Induced by Baroclinic Instability in the Southwest Region of the Kerguelen Plateau, East Antarctica

Strong Eddy Kinetic Energy Anomalies Induced by Baroclinic Instability in the Southwest Region of the Kerguelen Plateau,East Antarctic

Surface chlorophyll anomalies induced by mesoscale eddy-wind interactions in the northern Norwegian Sea

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