Eddy‐Induced Temperature and Salinity Variability in the Arabian Sea

Trott, Corinne B.; Subrahmanyam, Bulusu; Chaigneau, Alexis; Roman‐Stork, Heather L.

doi:10.1029/2018gl081605

Cited by 35 publications

(45 citation statements)

References 53 publications

(67 reference statements)

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“…Using the technique initially proposed by Chaigneau et al (2008) and Pegliasco et al (2015) and recently used in Trott et al (2018Trott et al ( , 2019 or Aguediou et al (2019), we apply an eddy-tracking algorithm to the GoM. This method first defines each eddy center by identifying local ADT minima (CEs) and maxima (AEs) and then defines each eddy edge as the largest ADT closed contour surrounding the eddy center.…”

Section: Eddy Trackingmentioning

confidence: 99%

“…This eddy-tracking algorithm searches for eddy edge intersections between time t 1 and t 1 + dt (dt = 1 day for the considered ADT product). If there are multiple intersections, we apply a cost function described in Trott et al (2018) to determine the most statistically similar eddy. This method identifies eddies within one radius with the most statistically similar radius, amplitude, and EKE and selects it to continue the trajectory.…”

Section: Eddy Trackingmentioning

confidence: 99%

“…In other regions of the world ocean, recent composite analysis of basin‐wide mesoscale eddy fields has proved useful in identifying spatial patterns as well as differences in vertical structure and surface characteristics between anticyclonic eddies (AEs) and cyclonic eddies (CEs). For example, Dawson et al () quantify biogeochemical cycling within eddies in the Southern Ocean, and Trott et al () make use of composite analysis to depict eddy‐induced temperature and salinity changes in the Arabian Sea. First, this sort of basin‐wide analysis of the mesoscale eddy field is lacking in the GoM.…”

Section: Introductionmentioning

confidence: 99%

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Eddy Surface Characteristics and Vertical Structure in the Gulf of Mexico from Satellite Observations and Model Simulations

et al. 2020

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The Gulf of Mexico exhibits strong circulation due to the Loop Current System, along with high mesoscale eddy activity. In order to investigate eddy characteristics, we apply an automatic eddy‐tracking algorithm to absolute dynamic topography maps and analyze the spatial distribution and evolution of eddy attributes including amplitude, radius, and eddy kinetic energy. The Loop Current region in the eastern Gulf of Mexico is an area of robust eddy generation for both cyclonic and anticyclonic eddies. Anticyclonic eddies were generally characterized by smaller amplitudes and larger radii when compared to their cyclonic counterparts. We also examine eddy surface properties including temperature and salinity anomalies as well as chlorophyll‐a concentration and observe how these properties vary between the eastern and western Gulf of Mexico. Persistent features such as the Loop Current System and coastal low‐salinity, highly biologically productive waters dominate eddy properties in the eastern side of the basin. We also apply the eddy‐tracking algorithm to a regional Hybrid Coordinate Ocean Model validated using Argo floats. We find that this model accurately reflects surface characteristics in the mesoscale eddy field as well as the mean vertical eddy structure and use it to extend our analysis of eddy properties with depth. We find that subsurface characteristics of density, salinity, temperature, and velocities vary greatly between eddies in the eastern and western Gulf of Mexico. Through composite analysis of both surface and subsurface eddy properties, we gain a more complete picture of the mechanisms behind the observable characteristics of these eddies.

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Section: Eddy Trackingmentioning

confidence: 99%

Section: Eddy Trackingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eddy Surface Characteristics and Vertical Structure in the Gulf of Mexico from Satellite Observations and Model Simulations

et al. 2020

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“…Wind stress (Trott et al, 2017), background currents (Trott et al, 2018), and west propagating Rossby waves (Brandt et al, 2002; McCreary et al, 1993) are qualitatively interpreted as possible factors that strengthen eddies in the region; however, no consensus has been reached. These eddies drive local upwelling and downwelling (Trott et al, 2019) and could make a large contribution to the marine ecosystem and biogeochemical variability when coupled with wind‐induced Ekman pumping (Seo et al, 2008; Yao & Hoteit, 2015). More importantly, eddies transport a significant amount of oceanic properties and influence the spreading pathways of marginal sea water (Carton et al, 2012; de Marez et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Eddy‐Induced Transport and Kinetic Energy Budget in the Arabian Sea

Zhan

Guo

Hoteit

2020

Geophysical Research Letters

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This study investigates the vertical eddy structure, eddy-induced transport, and eddy kinetic energy (EKE) budget in the Arabian Sea (AS) using an eddy-resolving reanalysis product. The EKE intensifies during summer in the western AS. Anticyclonic eddies (AEs) and cyclonic eddies (CEs) present warm-fresh and cold-salty cores, respectively, with interleaved salinity structures. The eddy-induced swirl transport is larger in the western AS and tends to compensate for heat transport by the mean flow. Zonal drift transport by AEs and CEs offset each other, and meridional transport is generally weaker. Eddies also produce notable upward heat flux during summer in the western AS, where ageostrophic circulations are induced to maintain a turbulent thermal wind balance. Plausible mechanisms for EKE production are governed by baroclinic and barotropic instabilities, which are enhanced in summer in the western basin, where signals are quantitatively one order larger than the turbulent wind inputs.

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“…To identify and track eddies in the BoB, we have used an algorithm originally proposed by Chaigneau et al (2008), expanded by Pegliasco et al (2015), and more recently used in Trott et al (2018), Trott, Subrahmanyam, Chaigneau, et al (2019) and Roman‐Stork, Subrahmanyam, and Trott (2019) in the northern Indian Ocean. We applied this method to SLA such that local maxima and minima of sea level defined the eddy centers.…”

Section: Methodsmentioning

confidence: 99%

Interactions Between Mesoscale Eddies and Synoptic Oscillations in the Bay of Bengal During the Strong Monsoon of 2019

et al. 2020

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The 2019 southwest monsoon season is the first strong monsoon in the last 25 years and occurred concurrently with a strong positive Indian Ocean Dipole (pIOD). Given these unique circumstances, we examine the mesoscale eddy field in the Bay of Bengal (BoB) during 2019 and the interactions between these eddies and 3-7-day synoptic oscillations and tropical systems, which contribute to monsoon rainfall and modulate the active (wet) and break (dry) phases of the Indian monsoon. We find that there is a drastic difference in eddy characteristics between the western (80-90°E) and eastern (90-100°E) BoB, where eddies in the eastern BoB are dominated by coastal Kelvin wave (CKW) dynamics and topographical influences, and the eddies in the western BoB are more heavily modulated by East India Coastal Current dynamics. We further find that the pIOD increased the overall sea level in the BoB and modified CKW propagation in the BoB such that all eddy types had more positive sea level anomalies. We find that cyclonic eddies vary coherently with both upper ocean heat content and 3-7-day bandpass filtered precipitation and that both the number of cyclonic eddies and eddy amplitude increase in coherence with precipitation and ocean heat content following the passage of a tropical system. These results suggest a strong relationship between cyclonic eddies and 3-7-day atmospheric variability. Plain Language Summary The 2019 southwest monsoon is the first strong monsoon since 1994 and also occurred during a strong positive Indian Ocean Dipole event. We analyze the mesoscale eddy field in the Bay of Bengal during 2019 and investigate the connection between these eddies and 3-7-day synoptic oscillations, which control the active (flood) and break (drought) phases of the monsoon over India. We find that coastal Kelvin waves influence eddies in both the eastern and western Bay, but that ocean bottom topography and the western boundary current dominate each region's dynamics, respectively. The positive Indian Ocean Dipole heavily impacted the coastal Kelvin waves in 2019. 3-7-day synoptic events were most closely associated with cyclonic eddies, especially in the western Bay. The number of eddies and eddy amplitudes both increased following the passage of a tropical system. We also recognized a tendency for the tropical systems in 2019 to pass over cyclonic eddies and intensify afterward. Our results suggest a strong relationship between 3-7-day synoptic-scale variability and cyclonic eddies in the Bay of Bengal.

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Eddy‐Induced Temperature and Salinity Variability in the Arabian Sea

Cited by 35 publications

References 53 publications

Eddy Surface Characteristics and Vertical Structure in the Gulf of Mexico from Satellite Observations and Model Simulations

Eddy Surface Characteristics and Vertical Structure in the Gulf of Mexico from Satellite Observations and Model Simulations

Eddy‐Induced Transport and Kinetic Energy Budget in the Arabian Sea

Interactions Between Mesoscale Eddies and Synoptic Oscillations in the Bay of Bengal During the Strong Monsoon of 2019

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