Exploring the upper ocean

Tandon Laboratory at UMass Dartmouth

Category: Uncategorized (page 1 of 4)

Alan Andonian from our research group presents at the National Conference of Undergraduate Research, and MassURC 2021

On Tuesday, April 13th 2021, Alan Andonian, a Mechanical Engineering senior and an undergraduate researcher presented his research on Fluid Motion Over Topography on a Rotating Earth at the National Conference of Undergraduate Research (NCURS). On Friday, April 23rd he will be presenting this study at the Massachusetts Undergraduate Research Conference (MasssURC). Alan’s mentors were Engineering and Applied Science (EAS) PhD Student Iury Simoes-Sousa and Prof. Amit Tandon from the Department of Mechanical Engineering. Alan’s presentation shows a numerical simulation of the ocean phenomena known as the Taylor Column. This counterintuitive phenomenon occurs at large-scales affected by Earth’s rotation. It can also be simulated at smaller scales, as in a rotating tank in the laboratory, which was made difficult by the pandemic. Therefore to demonstrate the effects of rotation in geophysical fluids, a MITgcm numerical model was created (Figure below). From this image, we can see that the flow goes around the topography even towards the surface. It is as if there is an invisible obstacle blocking the flow trajectory, the Taylor Column.

Alan Andonian

Iury Simoes-Sousa








JGR-Ocean Paper published on “Submesoscale phenomena due to the Brazil Current crossing of the Vitória‐Trindade Ridge”

A paper by Dante and Prof Amit Tandon has just been published in JGR-Ocean titled “Submesoscale phenomena due to the Brazil Current crossing of the Vitória‐Trindade Ridge”. The paper can be found here.

Congratulations Dante and Prof Tandon!

Plain language summary of this paper appears below:
“At 20.5°S, strong currents interact with a submarine chain, the Vitória‐Trindade Ridge. In this study, we use new observations and a 2 km‐resolution regional numerical model to analyze how the interaction between the Brazil Current and the Vitória‐Trindade Ridge seamounts give rise to submesoscale instabilities. We present new high‐resolution velocity and density observations that capture submesoscale features associated with the flow, with patches of unstable flow associated with the Brazil Current interacting with the seamounts. In the same transects of the cruise, our simulation shows that submesoscale activity follows a typical seasonal cycle. But this seasonality is masked in regions where the flow intercepts topography. A Spatio-temporal analysis of the vertical fluxes points to flow‐topography interactions as the main source for these recurrent, deeper instabilities. As the Vitória‐Trindade Ridge emerges as a submesoscale hotspot in the oligotrophic South Atlantic, the lack of observations still remains the main obstacle to better understand the submesoscale processes in the region.”

JGR-Ocean Paper published on Process studies regarding “Generation of Submesoscale Temperature Inversions below Salinity Fronts”

A Paper by Sanjiv and Prof Amit Tandon has just been published in JGR-Ocean titled “Generation of Submesoscale Temperature Inversions Below Salinity Fronts in the Bay of Bengal” . This process study paper is motivated by our winter BoB observations of sub-surface warm layers.

Link to the paper can be found here.

Congratulations Sanjiv and Prof Tandon !

A plain language summary of the paper appears below:

“The ocean and atmosphere communicate at the air-sea interface. This communication occurs through exchange of heat, momentum, and other properties. The exchange of heat, in particular, shapes the coupled interplay of the ocean and atmosphere over periods ranging from hours to years. The change in ocean temperature versus depth crucially impacts how much heat is available for exchange with the overlying atmosphere. Typically, temperature decreases with depth but in regions like the Bay of Bengal (BoB), it can increase with depth for some distance before continuing to decrease at greater depths. Such increases in temperature are called “inversions.” In this study, we use high-resolution numerical modeling to explain the formation of inversions in the BoB that have a thickness of 10–30 m and a horizontal size of 1–10 km (submesoscale). Observations show frequent occurrence of such inversions in this region. We identify mechanisms illustrating how such inversions might be formed. Our results have potential implications for climate models where the grid spacing is too coarse to capture such mechanisms. The study demonstrates the value of high-resolution modeling in identifying new processes missing in today’s climate models.”

Student Spotlight on Sid by GSS, UMass Dartmouth

Sid, who is a second-year PhD student at Tandon Labs was recently featured in the Student Spotlight Series by Graduate Student Senate (GSS), UMass Dartmouth. Find more about his graduate student life and our research in the article here.

Nice going, Sid!

Prof Amit Tandon live at USIEF session on “The Oceans and the Monsoon”

The United States-India Educational Foundation (USIEF) organized a virtual session on “The Oceans and the Monsoon” on Thursday, June 25, 2020, from 5 p.m. to 6.15 p.m(IST). Mr Moulik D. Berkana, Cultural Affairs Officer, the U.S. Consulate General, Chennai, presented the opening remarks followed by a Special Address by Dr M. Rajeevan, Secretary to Government of India, Ministry of Earth Sciences, New Delhi.

Prof Amit Tandon served as one of the panellists in this. The other panellists of this webinar included Dr R Venkatesan (NIOT and Professional Excellence fellowship scholar, UMassD) and Shikha Singh ( Scientist-C at IITM and currently a member of Tandon Labs as a Fulbright Doctoral scholar with UMassD as the host institution).

The session was about how Oceans around India play a crucial role in bringing and sustaining Monsoons and how oceanic patterns should be used as an indicator for agriculture and policies. This session also addressed the challenges faced for predicting the onset of Monsoon and the amplitude of intraseasonal variations amidst the time that this seasonal phenomenon is currently active over the Indian Subcontinent.

A total of 1164 people registered and there were 599 attendees from India and USA.

One can find the recorded version of this webinar here.

From L to R: Ms Shikha Singh, Prof Amit Tandon, Dr. R. Venkatesan, Mr. Moulik Berkhana, and the Secretary MoES Dr. M. Rajeevan

Members of Tandon Lab present at Ocean Sciences Meeting 2020

Professor Amit Tandon and the rest of the lab had strong participation in the recently concluded Ocean Sciences Meeting at San Diego, CA. Spread across 6 days in mid-February, it was definitely a good experience for the group to be a part of this event by presenting their published/on-going work as well as attending lots of other talks from a plethora of topics being discussed. Following are the details of the talks/posters given by the lab members:

a) Monsoon Intra-seasonal oscillations in the Bay of Bengal: Amit Tandon and co-authors

b) Submesoscale temperature inversions in the Bay of Bengal during the winter monsoon: Sanjiv Ramachandran, Amit Tandon and co-authors

c) Atmospheric Cold Pools in the Bay of Bengal: A Fuzzy Logic Approach: Jared Buckley, Amit Tandon

d) Long Wave Measurement Corrections for the OMNI Buoy Network: Jossia Joseph, Amit Tandon and other co-authors

e) The 2018 Monsoon Onset from Ship-based Measurements across the Air-Sea Interface: Emily Shroyer, Amit Tandon and co-authors

f) Basin-scale Diapycnal Mixing Rates in the Bay of Bengal Inferred from Freshwater Balance: J Sree Lekha, Debasis Sengupta, Emily Shroyer and Amit Tandon.

g) Nutrient Supply Caused by Submesoscale and Microscale Mixing Processes in the Upstream Kuroshio: Takeyoshi Nagai, Amit Tandon and co-authors

h) The Barreirinhas Eddies Conundrum: Why Are These Super Anticyclones at Low Latitudes so Long-lived: Iury T Simoes-Sousa and co-authors

i) On the Role of Turbulent Mixing Produced by Vertical Shear Between the Brazil Current and the Intermediate Western Boundary Current by Caue Lazaneo and co-authors

j) On the variability of Arabian Sea mixing and its energetics: Shikha Singh and co-authors

k) On the Sea Surface Temperature variability and mesoscale dispersion in the Bay of Bengal during 2015 and 2019 monsoon as tracked by drifters: Siddhant Kerhalkar, Amit Tandon and co-authors

Dr Shroyer (L) and Prof Tandon (R) at Ocean Sciences Meeting 2020

Sid with his poster at Ocean Sciences Meeting 2020

Iury (L) and Caue(R) with their posters at Ocean Sciences Meeting 2020


Jared Buckley successfully defends his dissertation

Congratulations to Jared Buckley, who successfully defended his PhD Thesis: “A new model of satellite-derived near-surface currents, the impact of lateral advection and a fuzzy logic approach to observing cold pools in the Bay of Bengal” on December 18, 2019.

Front Row: (from L-R) Caue, Prof Tandon, Shikha and Dr Venkatesan Back Row: (from L-R) Sid, Iury, Jared and Patrick

Tandon Lab visits Brown University

Tandon Lab visited Brown University on November 21, 2019 for a joint group meeting with Fox-Kemper Research group. This joint meeting involved knowing about the work being carried out by the members of each group which was followed by a quick brain-storming session.

Tandon Lab conducts the “Air-Sea Interaction Day” at UMass Dartmouth.

Tandon Lab conducted an Air-Sea Interaction Day on October 16, 2019 and hosted Prof Debasis Sengupta (Indian Institute of Science, Bangalore), Dr Robert Weller (WHOI), Dr Amala Mahadevan (WHOI) and Dr R Venkatesan (NIOT and Fulbright Flex awardee, UMassD) at SMAST, UMass Dartmouth. There were talks given by the members as well as guests followed by a long meeting about some of the future work.

(From L-R) Juliana, Caue, Dr Mahadevan (WHOI), Shikha, Dr Weller (WHOI), Jared, Iury, Dr Venkatesan (NIOT), Prof Sengupta (IISc), Prof Tandon, and Sid

Professor Amit Tandon presents a seminar at GSO, University of Rhode Island

Prof Tandon presented a seminar on “Sub-mesoscale processes in the Bay of Bengal” at Graduate School of Oceanography at University of Rhode Island, Narragansett, RI on October 04, 2019. The seminar was attended by some of the members of the lab as well. This seminar was also followed by a short visit to the aquarium situated at GSO, URI

(From L-R) Sid, Shikha, Caue, Aakash (Brown University), Brodie (Brown University), Sarah (seminar organiser at URI), Dr Venkatesan, Luis (seminar organiser at URI) and Prof Tandon

(From L-R) Caue, Shikha, Prof Tandon and Dr Venkatesan with URI’s R/V Endeavor in the background

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