Jai Sukhatme
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View article: Influx of Bay of Bengal waters and stirring trends in the Arabian Sea based on satellite altimetry
Influx of Bay of Bengal waters and stirring trends in the Arabian Sea based on satellite altimetry Open
View article: Intraseasonal Equatorial Kelvin and Rossby Waves in Modern AI-ML Models
Intraseasonal Equatorial Kelvin and Rossby Waves in Modern AI-ML Models Open
We examine the structure of large-scale convectively coupled Kelvin and Rossby waves in a suite of modern AI-ML models. In particular, multiple runs of PanguWeather, GraphCast, FourCastNet and Aurora are performed to assess the structure o…
View article: Influx of Bay of Bengal waters and stirring trends in the Arabian Sea based on satellite altimetry
Influx of Bay of Bengal waters and stirring trends in the Arabian Sea based on satellite altimetry Open
Freshwater export from the Bay of Bengal (BoB) can drive the regional air-sea interaction in the Arabian Sea (AS). We use AVISO geostrophic and Globcurrent velocities to characterize horizontal stirring on a seasonal and interannual time s…
View article: Southwestward propagating quasi-biweekly oscillations over the South-West Indian Ocean during boreal winter: Characteristics and propagation mechanism
Southwestward propagating quasi-biweekly oscillations over the South-West Indian Ocean during boreal winter: Characteristics and propagation mechanism Open
An analysis of outgoing longwave radiation (OLR) and winds over the South-West Indian Ocean (SWIO) yields regular, poleward propagating, large-scale, convectively coupled systems of alternating cyclonic and anticyclonic circulation with a …
View article: Changes in the tropical upper-tropospheric zonal momentum balance due to global warming
Changes in the tropical upper-tropospheric zonal momentum balance due to global warming Open
We study the zonal momentum budget of the deep upper tropics in the context of present and future climates. In the zonal mean, as is known, a robust balance exists between the acceleration by the horizontal eddy momentum flux convergence a…
View article: Role of Bay of Bengal low‐pressure systems in the formation of mid‐tropospheric cyclones over the Arabian Sea and western India
Role of Bay of Bengal low‐pressure systems in the formation of mid‐tropospheric cyclones over the Arabian Sea and western India Open
Arabian Sea mid‐tropospheric cyclones (MTCs), responsible for extreme rainfall events in Western India, often coincide with monsoon low‐pressure systems (LPSs) over the Bay of Bengal. However, the influence of Bay of Bengal LPSs on the for…
View article: Spontaneous equatorial flow reversals at the equator in  moist shallow water turbulence
Spontaneous equatorial flow reversals at the equator in  moist shallow water turbulence Open
Equatorial superrotation is a striking feature in planetary circulations, also found in atmospheric circulation models. Geological evidence shows that Earth was in a state of super-rotation during the Eocene and Pliocene. On Earth, su…
View article: Changes in the tropical upper tropospheric zonal momentum balance due to global warming
Changes in the tropical upper tropospheric zonal momentum balance due to global warming Open
The zonal momentum budget of the deep upper tropics is studied in the context of present and future climates. In the zonal mean, as is known, a robust balance exists between the acceleration by the horizontal eddy momentum flux convergence…
View article: Supplementary material to "Changes in the tropical upper tropospheric zonal momentum balance due to global warming"
Supplementary material to "Changes in the tropical upper tropospheric zonal momentum balance due to global warming" Open
View article: Northward Propagating Versus Non-propagating BSISO over South Asia: Horizontal Advection Driven Moisture Mode Within a Vertically Sheared Background
Northward Propagating Versus Non-propagating BSISO over South Asia: Horizontal Advection Driven Moisture Mode Within a Vertically Sheared Background Open
The Boreal Summer Intraseasonal Oscillation (BSISO) is a pronounced mode of tropical variability. Here, we identify two types of BSISO events, one which propagates northward over South Asia (SA) from the equatorial Indian Ocean (EIO), and …
View article: The role of tropical and extra-tropical waves in the Hadley circulation
The role of tropical and extra-tropical waves in the Hadley circulation Open
The tropical overturning circulation is examined in a moist aquaplanet general circulation model forced using a non-interactive sea surface temperature (SST) distribution that varies between a present-day Earth-like profile and one that is…
View article: Role of Bay of Bengal Low Pressure Systems in the Formation of Mid-Tropospheric Cyclones over the Arabian Sea and Western India
Role of Bay of Bengal Low Pressure Systems in the Formation of Mid-Tropospheric Cyclones over the Arabian Sea and Western India Open
Arabian Sea Mid-Tropospheric Cyclones (MTCs), which are responsible for extreme rainfall events in western India, often coincide with monsoon low-pressure systems (LPS) over the Bay of Bengal. However, the role of Bay of Bengal LPSs in the…
View article: Northward Prpogating BSISO over South Asia: connection between moisture advection and vortex tilting
Northward Prpogating BSISO over South Asia: connection between moisture advection and vortex tilting Open
The mechanism behind the northward propagation of the Boreal Summer Intraseasonal Oscillation (BSISO) over South Asia is still elusive, though many theories have been proposed to explain it. In this study, column- integrated moisture budge…
View article: Investigating the Hadley Cell and eddies with varying sea surface temperature gradients
Investigating the Hadley Cell and eddies with varying sea surface temperature gradients Open
We examine the tropical meridional overturning circulation in an aquaplanet GCM with fixed orbital parameters and uniform insolation angle. The atmosphere is forced by an imposed non-interactive sea surface temperature (SST) distribution w…
View article: Diagnosing stirring in the Arabian Sea from a long-term dataset
Diagnosing stirring in the Arabian Sea from a long-term dataset Open
Stirring of passive tracers on the surface of the Arabian Sea is studied from a long-term data set comprising AVISO surface geostrophic and Globcurrent on a sub-seasonal and interannual time scale. To begin with, we elucidate the spatiotem…
View article: The role of North Atlantic blocking high during large-scale heavy rainfall events over central India
The role of North Atlantic blocking high during large-scale heavy rainfall events over central India Open
Large-scale extreme rainfall events (LEREs) over central India are produced by monsoon low-pressure systems (LPSs) when assisted by a secondary cyclonic vortex (SCV).Both the LPS and the SCV are embedded in a monsoon trough and form mainly…
View article: Eddy-freshwater Interaction using Regional Ocean Modeling System in the Bay of Bengal
Eddy-freshwater Interaction using Regional Ocean Modeling System in the Bay of Bengal Open
Eddy-freshwater interaction is studied in the north Bay of Bengal (BoB) with a high-resolution simulation using the Regional Ocean Modeling System. Following observations, the model simulates the trapping and homogenization of river water …
View article: Eddy-freshwater interaction in Bay of Bengal
Eddy-freshwater interaction in Bay of Bengal Open
The model simulation was performed using the Regional Ocean Modeling System (ROMS) in the Bay of the Bengal at 3 Km to study the mechanism behind the eddy-freshwater interaction during the post-monsoon period, i.e., from October to Novembe…
View article: Eddy-freshwater interaction in Bay of Bengal
Eddy-freshwater interaction in Bay of Bengal Open
The model simulation was performed using the Regional Ocean Modeling System (ROMS) in the Bay of the Bengal at 3 Km to study the mechanism behind the eddy-freshwater interaction during the post-monsoon period, i.e., from October to Novembe…
View article: Quasi-biweekly oscillation over South-West Indian Ocean during boreal winter: features, propagation dynamics and its impact on Tropical Cyclone genesis and tracks
Quasi-biweekly oscillation over South-West Indian Ocean during boreal winter: features, propagation dynamics and its impact on Tropical Cyclone genesis and tracks Open
<p>An analysis of NOAA outgoing longwave radiation (OLR) data and NCEP-NCAR reanalysis winds spanning 10 years (2000/2001-2009/2010) over the South-West Indian Ocean (SWIO) yields regular, poleward propagating, large-scale, convectiv…
View article: Classification of Middle Tropospheric Systems over the Arabian Sea and Western India
Classification of Middle Tropospheric Systems over the Arabian Sea and Western India Open
The formation of Middle Tropospheric Cyclones (MTCs) that are responsible for a large portion of annual precipitation and extreme rainfall events over western India is studied using an unsupervised machine learning algorithm and cyclone tr…
View article: Comment on wcd-2021-66
Comment on wcd-2021-66 Open
Abstract. An analysis of outgoing longwave radiation (OLR) over the South-West Indian Ocean (SWIO) yields regular, poleward propagating, large-scale, convectively coupled systems of alternating cyclonic and anticyclonic ci…
View article: Eddy induced trapping and homogenization of freshwater in the Bay of Bengal
Eddy induced trapping and homogenization of freshwater in the Bay of Bengal Open
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Oceans. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be preliminar…
View article: Comment on wcd-2021-66
Comment on wcd-2021-66 Open
An analysis of outgoing longwave radiation (OLR) over the South-West Indian Ocean (SWIO) yields regular, poleward propagating, large-scale, convectively coupled systems of alternating cyclonic and anticyclonic circulation with a quasi-biwe…
View article: Southwestward propagating quasi-biweekly oscillations over the South-West Indian Ocean during boreal winter
Southwestward propagating quasi-biweekly oscillations over the South-West Indian Ocean during boreal winter Open
An analysis of outgoing longwave radiation (OLR) over the South-West Indian Ocean (SWIO) yields regular, poleward propagating, large-scale, convectively coupled systems of alternating cyclonic and anticyclonic circulation with a quasi-biwe…
View article: Dry and moist atmospheric circulation with uniform sea‐surface temperature
Dry and moist atmospheric circulation with uniform sea‐surface temperature Open
The steady and transient response of “dynamically” dry and moist atmospheres to uniform sea‐surface temperature (SST) is studied using an aquaplanet general circulation model (GCM). Specifically, the latent heat () of water vapour is varie…
View article: Changes in Seasonal Upper Tropical Momentum Fluxes with Global Warming
Changes in Seasonal Upper Tropical Momentum Fluxes with Global Warming Open
The boreal summer tropical upper-tropospheric momentum budget involves a balance between eddy and mean meridional fluxes. In winter, however, the eddy flux itself acts to accelerate and decelerate the zonal flow in the Asian and East Pacif…
View article: A Global Tropical Survey of Mid-Tropospheric Cyclones
A Global Tropical Survey of Mid-Tropospheric Cyclones Open
Mid-Tropospheric Cyclones (MTCs) are moist synoptic systems with distinct mid-tropospheric vorticity maxima and weak signatures in the lower troposphere. Composites and statistics of tropical MTCs are constructed and compared with monsoon …
View article: Turbulence and equatorial waves in moist and dry shallow water systems
Turbulence and equatorial waves in moist and dry shallow water systems Open
Turbulence and large-scale waves in the tropical region are studied using the spherical shallow water equations. With mesoscale vorticity forcing, both moist and dry systems show kinetic energy scaling that is dominated by rotational modes…
View article: Coexistence of equatorial waves & turbulence in moist shallow water simulations&#160;
Coexistence of equatorial waves & turbulence in moist shallow water simulations  Open
<p>Moist equatorial waves, responsible for a large fraction of synoptic and intraseasonal tropical variability, are visible in satellite observations of cloud top temperature and outgoing longwave radiation, with familiar dispersion …