Mesoscale eddy variability and its linkage to deep convection over the Bay of Bengal using satellite altimetric observations

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

doi:10.1016/j.asr.2019.09.054

Cited by 9 publications

(23 citation statements)

References 47 publications

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“…In terms of the trend of eddy dissipation, both CEs and AEs showed slight fluctuations as compared with eddy formation. Previous studies have pointed out that the interannual distribution of eddies may be related to the monsoon [21,56]. On seasonal scales (Figure 12c,d), the inverse to the interannual trend was observed.…”

Section: Eddy Generation and Dissipationmentioning

confidence: 59%

Multi-Source Data Analysis of Mesoscale Eddies and Their Effects on Surface Chlorophyll in the Bay of Bengal

Yang

Liu

et al. 2020

Remote Sensing

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Mesoscale eddies are important to ocean circulation due to their roles in the transport of mass, energy, and heat. This study employs a combination of data sources to initiate a statistical analysis of eddy spatiotemporal characteristics in the Bay of Bengal (BOB) to elucidate the sea surface and vertical structures of the eddies and their impacts on sea surface chlorophyll (Chl) distributions. The results suggest that 1237 cyclonic eddies (CEs) and 1121 anticyclonic eddies (AEs) were detected in 26 years. The number of two eddy polarities was almost the same, and most of them spread to the west or southwest direction. The vertical change of temperature (T) and salinity (S) caused by the eddies is studied and the anomalous eddies, i.e., a CE (AE) eddy with warm (cold) water at the center, are mainly distributed on the northeast side of the Island of Sri Lanka. Furthermore, CEs are found to increase Chl concentration in the surrounding sea by approximately 11.15%, while AEs decrease concentrations also by approximately 11.25%. Changes in Chl concentrations occur most rapidly during the mature and intensification eddy phases. Observations also indicate that the strong local current and wind fields are the primary mechanisms in eddy generation.

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Section: Eddy Generation and Dissipationmentioning

confidence: 59%

Multi-Source Data Analysis of Mesoscale Eddies and Their Effects on Surface Chlorophyll in the Bay of Bengal

Yang

Liu

et al. 2020

Remote Sensing

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“…Mesoscale eddies are transient features in the BoB that play a major role in the transport of heat, salt, and nutrients and in air‐sea processes (Gulakaram et al, 2018; Patnaik et al, 2014; Roman‐Stork, Subrahmanyam, & Trott, 2019; Sreenivas et al, 2012). The generation and behavior of these eddies are highly subject to forcing mechanisms on seasonal timescales, such as monsoonal wind reversal and CKWs, which impact the eastern and western halves of the Bay differently.…”

Section: Resultsmentioning

confidence: 99%

“…This daily product is at a global grid spacing of 0.25° and is available from 1981 to present. This product has been widely used in ISO and monsoon studies (Girishkumar et al, 2017; Murty et al, 2004; Roman‐Stork, Subrahmanyam, & Murty, 2019; Roman‐Stork, Subrahmanyam, & Trott, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…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%

“…Given the importance of the BoB in monsoon dynamics, recent studies have begun to examine the eddy dynamics in this region (Chen et al, 2012; Cheng et al, 2018; Cui et al, 2016; Dandapat & Chakraborty, 2016) and the role these eddies play in ocean‐atmosphere interactions (Gulakaram et al, 2018; Patnaik et al, 2014; Roman‐Stork, Subrahmanyam, & Trott, 2019; Sreenivas et al, 2012). Studies by Gulakaram et al (2018) and Roman‐Stork, Subrahmanyam, and Trott (2019) have observed a connection between mesoscale eddies in the BoB with localized atmospheric convection, and a number of other studies have emphasized the role eddies can play in storm tracks and intensification (Ali et al, 2007; Jangir et al, 2020; Ma et al, 2017; Mawren & Reason, 2017; Patnaik et al, 2014; Shay et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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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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Role and response of ocean–atmosphere interactions during Amphan (2020) super cyclone

et al. 2021

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Mesoscale eddy variability and its linkage to deep convection over the Bay of Bengal using satellite altimetric observations

Cited by 9 publications

References 47 publications

Multi-Source Data Analysis of Mesoscale Eddies and Their Effects on Surface Chlorophyll in the Bay of Bengal

Multi-Source Data Analysis of Mesoscale Eddies and Their Effects on Surface Chlorophyll in the Bay of Bengal

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

Role and response of ocean–atmosphere interactions during Amphan (2020) super cyclone

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