Exploring the upper ocean

Tandon Laboratory at UMass Dartmouth

Category: Uncategorized (page 1 of 4)


July 08. 2021: We now have two hydrophones and a weather station deployed on our pier at the School for Marine Science and Technology (SMAST), just in time for Tropical Storm Elsa, to get some good pilot data this weekend. Alan and CJ did a great job getting everything together for the deployment before Alan heads to San Diego to work in Dr Luca Centurioni’s lab. Forrest and Jen, the SMAST divers were super helpful working with us.

The hydrophones are approximately 1m and 2m below the low tide mark, and the tide is roughly 1 m here, so we’ll get a range of depths over time.

Tandon Lab now functioning in person amidst the pandemic

Since the COVID-19 was in full force in Massachusetts for the past year, the members of the Tandon Lab were forced to stay at home (as per the local policies) and work remotely. But the rapid vaccination campaigns across the state lead to the university allowing the research to be conducted in person. This lead to a very unique setting of a hybrid meeting on June 10, 2021 where the local members of the group attended the meeting in-person at the SMAST East conference room while the international members attended this meeting remotely (via zoom). This is because Prof Tandon co-advises a lot of students from international collaborations (including the dual degree PhD students from the University of Sao Paolo) who could not join us to meet in person due to the current travel restrictions.

Sitting: Patrick, Standing (from left): Prof Tandon, Alan, Iury, Ersen’S and Sid at SMAST-East conference room

Local participants included Prof Amit Tandon, Iury (PhD candidate), Sid (PhD student), Patrick (Masters student), Alan (Former REU and incoming Masters student) and Ersen’S (Summer REU student) while international members included Shikha (Scientist at IITM Pune), Filipe (PhD dual degree candidate) and Caique (Masters student at USP co-advised with Prof Ilson). The unique settings were a challenge initially but the members of the group were resilient during the meeting. Tandon Lab is now functioning in person.

Local Members of Tandon Lab with the glorious SMAST-E building in the background. From left: Sid, Iury, Prof Tandon, Patrick, Alan, Ersen’S and CJ

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.

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