9 citations · 22 across the 12 of their papers we have counts for
13 papers
Emergence of an Advective Boundary Layer in Monsoon Cross-Equatorial Flow: Scaling, Dynamics, and Idealized Models
Rajat Masiwal, Ashwin K Seshadri, Vishal Dixit
The conventional Ekman model of the tropical boundary layer neglects nonlinear momentum advection and breaks down near the equator, where Coriolis effects are weak. During South As…
Quadratic invariants and Hamiltonian structure in coupled gyrostat low-order model hierarchies
Ashwin K Seshadri, S Lakshmivarahan
Coupled gyrostat low-order models (GLOMs) are energy-conserving cores of Galerkin-truncated fluid and geophysical systems, including Rayleigh-Benard convection and vorticity dynami…
Minimal chaotic models from the Volterra gyrostat
Ashwin K Seshadri, S Lakshmivarahan
Low-order models obtained through Galerkin projection of several physically important systems (e.g., Rayleigh-Bénard convection, mid-latitude quasi-geostrophic dynamics, and vortic…
Convergent estimators of variance of a spatial mean in the presence of missing observations
Ashwin K Seshadri
In the geosciences, a recurring problem is one of estimating spatial means of a physical field using weighted averages of point observations. An important variant is when individua…
Invariants and chaos in the Volterra gyrostat without energy conservation
Ashwin K Seshadri, S Lakshmivarahan
The model of the Volterra gyrostat (VG) has not only played an important role in rigid body dynamics but also served as the foundation of low-order models of many naturally occurri…
A Recharge Oscillator Model for Interannual Variability in Venus' Clouds
Pushkar Kopparla, Ashwin Seshadri, Takeshi Imamura +1
Sulfur dioxide is a radiatively and chemically important trace gas in the atmosphere of Venus and its abundance at the cloud-tops has been observed to vary on interannual to decada…
Cumulative emissions accounting of greenhouse gases due to path independence for a sufficiently rapid emissions cycle
Ashwin K Seshadri
Cumulative emissions accounting for carbon-dioxide (CO2) is founded on recognition that global warming in Earth System Models (ESMs) is roughly proportional to cumulative CO2 emiss…
Economics of carbon-dioxide abatement under an exogenous constraint on cumulative emissions
Ashwin K Seshadri
The fossil-fuel induced contribution to further warming over the 21st century will be determined largely by integrated CO2 emissions over time rather than the precise timing of the…
Statistics of spatial averages and optimal averaging in the presence of missing data
Ashwin K Seshadri
We consider statistics of spatial averages estimated by weighting observations over an arbitrary spatial domain using identical and independent measuring devices, and derive an acc…
Economics of limiting cumulative CO2 emissions
Ashwin K Seshadri
Global warming from carbon dioxide (CO2) is known to depend on cumulative CO2 emissions. We introduce a model of global expenditures on limiting cumulative CO2 emissions, taking in…
Detection of Spatiotemporally Coherent Rainfall Anomalies Using Markov Random Fields
Adway Mitra, Ashwin K. Seshadri
Precipitation is a large-scale, spatio-temporally heterogeneous phenomenon, with frequent anomalies exhibiting unusually high or low values. We use Markov Random Fields (MRFs) to d…
Exploring Spatial Coherence in Inter-annual Changes and Annual Extremes of Rainfall over India
Adway Mitra, Ashwin K. Seshadri
Forecasts of monsoon rainfall for India are made at national scale. But there is spatial coherence and heterogeneity that is relevant to forecasting. This paper considers year-to-y…
Factors controlling the time-delay between peak CO2 emissions and concentrations
Ashwin K. Seshadri
Carbon-dioxide (CO2) is the main contributor to anthropogenic global warming, and the timing of its peak concentration in the atmosphere is likely to govern the timing of maximum r…