Zobrazeno 1 - 10
of 242
pro vyhledávání: '"Stechmann, Samuel N"'
Sea ice plays a crucial role in the climate system, particularly in the Marginal Ice Zone (MIZ), a transitional area consisting of fragmented ice between the open ocean and consolidated pack ice. As the MIZ expands, understanding its dynamics becomes
Externí odkaz:
http://arxiv.org/abs/2410.23138
Beyond Linear Decomposition: a Nonlinear Eigenspace Decomposition for a Moist Atmosphere with Clouds
A linear decomposition of states underpins many classical systems. This is the case of the Helmholtz decomposition, used to split vector fields into divergence-free and potential components, and of the dry Boussinesq system in atmospheric dynamics, w
Externí odkaz:
http://arxiv.org/abs/2405.11107
Lagrangian trajectories are widely used as observations for recovering the underlying flow field via Lagrangian data assimilation (DA). However, the strong nonlinearity in the observational process and the high dimensionality of the problems often ca
Externí odkaz:
http://arxiv.org/abs/2401.18048
In applications such as free-space optical communication, a signal is often recovered after propagation through a turbulent medium. In this setting, it is common to assume that limited information is known about the turbulent medium, such as a space-
Externí odkaz:
http://arxiv.org/abs/2401.05617
Potential vorticity (PV) is one of the most important quantities in atmospheric science. The PV of each fluid parcel is known to be conserved in the case of a dry atmosphere. However, a parcel's PV is not conserved if clouds or phase changes of water
Externí odkaz:
http://arxiv.org/abs/2311.09382
Autor:
Du, Shukai, Stechmann, Samuel N.
In this paper, we propose a systematic approach for accelerating finite element-type methods by machine learning for the numerical solution of partial differential equations (PDEs). The main idea is to use a neural network to learn the solution map o
Externí odkaz:
http://arxiv.org/abs/2308.02467
Sea ice profoundly influences the polar environment and the global climate. Traditionally, Sea ice has been modeled as a continuum under Eulerian coordinates to describe its large-scale features, using, for instance, viscous-plastic rheology. Recentl
Externí odkaz:
http://arxiv.org/abs/2303.07819
The precipitating quasi-geostrophic equations go beyond the (dry) quasi-geostrophic equations by incorporating the effects of moisture. This means that both precipitation and phase changes between a water-vapour phase (outside a cloud) and a water-va
Externí odkaz:
http://arxiv.org/abs/2301.07611
In free-space optical communications and other applications, it is desirable to design optical beams that have reduced or even minimal scintillation. However, the optimization problem for minimizing scintillation is challenging, and few optimal solut
Externí odkaz:
http://arxiv.org/abs/2211.09265
Systematic assessment of the effects of space averaging and time averaging on weather forecast skill
Autor:
Li, Ying, Stechmann, Samuel N.
Intuitively, one would expect a more skillful forecast if predicting weather averaged over one week instead of the weather averaged over one day, and similarly for different spatial averaging areas. However, there are few systematic studies of averag
Externí odkaz:
http://arxiv.org/abs/2207.13486