Journal of the Atmospheric Sciences: Recent submissions
Now showing items 3561-3580 of 13215
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Environmental Influences on the Strength of Tropical Storm Debby (2006)
(American Meteorological Society, 2011)his study uses mesoscale ensemble forecasts to compare the magnitude of nonaerosol effects of the Saharan air layer (SAL) with other environmental influences on the intensity of Tropical Storm Debby. Debby was a weak Cape ... -
Equatorial Waves in the Upper Troposphere and Lower Stratosphere Forced by Latent Heating Estimated from TRMM Rain Rates
(American Meteorological Society, 2011)quatorial atmospheric waves in the upper troposphere and lower stratosphere (UTLS), excited by latent heating, are investigated by using a global spectral model. The latent heating profiles are derived from the 3-hourly ... -
Statistical Analysis of Aerosol Effects on Simulated Mixed-Phase Clouds and Precipitation in the Alps
(American Meteorological Society, 2011)ncreasing the aerosol number in warm-phase clouds is thought to decrease the rain formation rate, whereas the physical processes taking place in mixed-phase clouds are more uncertain. Increasing number concentrations of ... -
The Link between Rossby Wave Breakings and Weather Regime Transitions
(American Meteorological Society, 2011)he link between Rossby wave breaking (RWB) and the four wintertime weather regimes over the North Atlantic domain is studied in this paper. Using the 40-yr ECMWF Re-Analysis (ERA-40) data, frequencies of occurrence of ... -
Modulations of the Phase Speed of Convectively Coupled Kelvin Waves by the ITCZ
(American Meteorological Society, 2011)number of studies suggest a two-way feedback between convectively coupled Kelvin waves (CCKWs) and the intertropical convergence zone (ITCZ). Viewed here as a proxy for deep convection, analysis of brightness temperature ... -
On the Factors Modulating the Stratocumulus to Cumulus Transitions
(American Meteorological Society, 2011)arge-eddy simulation (LES) is used to explore the role of various processes in regulating the stratocumulus to cumulus transition (SCT). Simulations are based on a composite case derived from a Lagrangian analysis of 2 yr ... -
A Quasigeostrophic Model for Moist Storm Tracks
(American Meteorological Society, 2011)he effect of moisture and latent heat release is investigated in the context of a three-level quasigeostrophic model on the sphere. The model is based on an existing dry model that was shown to be able to reproduce the ... -
Do We Observe Aerosol Impacts on DSDs in Strongly Forced Tropical Thunderstorms?
(American Meteorological Society, 2011)ain drop size distributions retrieved from polarimetric radar measurements over regularly occurring thunderstorms over the islands north of Darwin, Australia, are used to test if aerosol contributions to the probability ... -
Intriguing Aspects of the Monsoon Low-Level Jet over Peninsular India Revealed by High-Resolution GPS Radiosonde Observations
(American Meteorological Society, 2011)he strong cross-equatorial flow in the lower troposphere, widely known as the monsoon low-level jet (MLLJ), plays an important role in the Indian summer monsoon (ISM) rainfall during June?September. Using high-resolution ... -
Estimating Atmospheric Boundary Layer Depth Using COSMIC Radio Occultation Data
(American Meteorological Society, 2011)his study presents an algorithm for estimating atmospheric boundary layer (ABL) depth from Global Positioning System (GPS) radio occultation (RO) data. The algorithm is applied to the Constellation Observing System for ... -
Revisiting Vacillations in Shallow-Water Models of the Stratosphere Using Potential-Vorticity-Based Numerical Algorithms
(American Meteorological Society, 2011)olar vortex vacillations are investigated using long-term simulations of potential-vorticity (PV)-based shallow-water (SW) models for the stratosphere. In the models examined, mechanical forcing is applied through a ... -
Turbulent Airflow at Young Sea States with Frequent Wave Breaking Events: Large-Eddy Simulation
(American Meteorological Society, 2011)neutrally stratified turbulent airflow over a very young sea surface at a high-wind condition was investigated using large-eddy simulations. In such a state, the dominant drag at the sea surface occurs over breaking waves, ... -
A New Parametric Model of Vortex Tangential-Wind Profiles: Development, Testing, and Verification
(American Meteorological Society, 2011)new parametric model of vortex tangential-wind profiles is presented that is primarily designed to depict realistic-looking tangential wind profiles such as those in intense atmospheric vortices arising in dust devils, ... -
Thermodynamics of the Madden–Julian Oscillation in a Regional Model with Constrained Moisture
(American Meteorological Society, 2011)o identify the main thermodynamic processes that sustain the Madden?Julian oscillation (MJO), an eddy available potential energy budget analysis is performed on a regional model simulation with moisture constrained by ... -
Response of the Antarctic Stratosphere to Two Types of El Niño Events
(American Meteorological Society, 2011)his study is the first to identify a robust El Niño?Southern Oscillation (ENSO) signal in the Antarctic stratosphere. El Niño events between 1979 and 2009 are classified as either conventional ?cold tongue? events (positive ... -
Daytime Development of the Boundary Layer over a Plain and in a Valley under Fair Weather Conditions: A Comparison by Means of Idealized Numerical Simulations
(American Meteorological Society, 2011)he daytime thermal structures of the valley boundary layer (VBL) and of the convective boundary layer (CBL) above a plain, as revealed by idealized large-eddy simulations, are compared. Simulations in the two environments ... -
Simple Multicloud Models for the Diurnal Cycle of Tropical Precipitation. Part II: The Continental Regime
(American Meteorological Society, 2011)he variation of precipitation over land due to the diurnal cycle of solar heating is examined here in the context of a simple multicloud model for tropical convection with bulk atmospheric boundary layer (ABL) dynamics. ... -
Vertical Structure of Hurricane Eyewalls as Seen by the TRMM Precipitation Radar
(American Meteorological Society, 2011)tatistical analysis of the vertical structure of radar echoes in the eyewalls of tropical cyclones, shown by the Tropical Rainfall Measurement Mission (TRMM) Precipitation Radar (PR), shows that the eyewall contains high ... -
Coupling between Gravity Waves and Tropical Convection at Mesoscales
(American Meteorological Society, 2011)n idealized cloud-system-resolving model simulation is used to examine the coupling between a tropical cloud population and the mesoscale gravity waves that it generates. Spectral analyses of the cloud and gravity wave ... -
Leading and Trailing Anvil Clouds of West African Squall Lines
(American Meteorological Society, 2011)he anvil clouds of tropical squall-line systems over West Africa have been examined using cloud radar data and divided into those that appear ahead of the leading convective line and those on the trailing side of the system. ...