Regional frequency analysis conditioned on large-scale atmospheric or oceanic fields

Large-scale atmospheric circulation patterns associated with the occurrence of severe storms Zab basin

Regularization of Large-scale Ill-conditioned Least Squares Problems Regularization of Large{scale Ill{conditioned Least Squares Problems

Ill{conditioned problems arise in important areas like geophysics, medical imaging and signal processing. The fact that the ill{cond-itioning is an intrinsic feature of these problems makes it necessary to develop special numerical methods to treat them. Regularization methods belong to this class. The lack of robust regularization methods for large{scale ill{cond-itioned problems motivated thi...

Large-Scale Atmospheric Forcing by Southeast Pacific Boundary-Layer Clouds: A Regional Model Study

A regional model is used to study the radiative effect of boundary layer clouds over the Southeast Pacific on large-scale atmosphere circulation during August–October in 1999. With the standard settings, the model simulates reasonably well the large-scale circulation over the eastern Pacific, precipitation in the intertropical convergence zone (ITCZ) north of the equator, and marine boundary la...

Phase function effects on oceanic light fields.

Numerical simulations show that underwater radiances, irradiances, and reflectances are sensitive to the shape of the scattering phase function at intermediate and large scattering angles, although the exact shape of the phase function in the backscatter directions (for a given backscatter fraction) is not critical if errors of the order of 10% are acceptable. We present an algorithm for genera...

Atmospheric aerosols alter oceanic activity

Atmospheric aerosols alter oceanic activity Oceans remain a key convergence point where anthropogenic and natural environmental effects can affect climate change and alter food chains. For example, mineral dust, soot, organic molecules, and other microscopic particles can become aerosolized in the atmosphere and provide nutrients and trace metals for phytoplankton in the open ocean. Adina Payta...