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Now showing items 1-9 of 9
A modeling study of thunderstorm electrification and lightning flash rate
(1997)
Observing the range of spatial scales important in thunderstorm electrification and subsequent lightning development is huge and would be an impossible task. The charge transfer processes within clouds takes place during collisions of particles with diameters on the order of 10-1000 $\mu$m, whereas the distance between the ...
A modeling study of the subtropical stratocumulus-to-trade-cumulus transition
(1997)
The transition from the subtropical stratocumulus-capped marine boundary layer to the trade-cumulus boundary layer is studied using numerical simulations. Model results are used to propose a new conceptual model of this transition based on the decoupling of turbulent convective eddies near the sea surface from those within ...
Interaction of frontal systems with the coastal mountains of the western U.S
(1997)
Observational analyses and numerical simulations are used to investigate the interaction between frontal systems and the complex terrain of the western U.S. for both warm and cold seasons. The different characteristics of mesoscale phenomena resulting from the interaction for each synoptic condition are explored and compared.For ...
Low frequency variability and mean circulation of the tropical stratosphere from UARS data
(1997)
The low frequency variability in the equatorial middle atmosphere is dominated by the semiannual (SAO) and quasi-biennial (QBO) oscillations. Although the general characteristics and forcing mechanisms of these oscillations are thought to be known, these oscillations are still not well reproduced in modeling experiments of ...
Interannual variability in cloudiness, sea surface temperature, and atmospheric circulation over the midlatitude North Pacific during summer
(1997)
Large-scale interannual and interdecadal variability in surface-observed marine stratiform cloud (MSC) amount and sea surface temperature (SST) are closely coupled over the central North Pacific during summer. Increased (decreased) MSC amount occurs with decreased (increased) SST, resulting from coincident meridional shifts ...
The climatic effects and requirements of arctic clouds
(1997)
The climatic effect and requirements of clouds over the Arctic Ocean are examined using a pair of one-dimensional models. A coupled ice-atmosphere column model with prescribed cloud properties is used to examine the effect of clouds on the central arctic climate. When forced with boundary conditions representative of the ...
On the mechanism of the large-scale seasonally varying upwelling in the region of the tropical tropopause
(1997)
This work investigates the physical mechanisms that determine the large-scale upwelling through the tropical tropopause, one of the principal components of stratosphere-troposphere mass exchange. The global-scale mean meridional circulation in the lower stratosphere and the upward branch of the tropospheric Hadley circulation ...
An observational and numerical study of windstorms along the western side of the Washington Cascade Mountains
(1997)
This dissertation investigates western Washington Cascade windstorms by utilizing various data sources such as conventional synoptic observations, profilers on both sides of the Cascade Mountains, a WSR-88D Doppler radar located in northern Puget Sound, and non-hydrostatic model simulations down to 1 km resolution. First, the ...
A model study of natural variability in the Arctic climate
(1997)
The arctic climate response to natural perturbations in the atmosphere is simulated with two numerical models. The first is a single-column, energy balance model of the atmosphere, sea ice, and upper-ocean system which I use to investigate how the variability in atmospheric energy transport is partitioned in the climate system ...