Journal of the Atmospheric Sciences: Recent submissions
Now showing items 2621-2640 of 13215
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Correction of Excessive Precipitation over Steep and High Mountains in a GCM
(American Meteorological Society, 2012)xcessive precipitation over steep and high mountains (EPSM) is a well-known problem in GCMs and mesoscale models. This problem impairs simulation and data assimilation products. Among the possible causes investigated in ... -
Annular Mode–Like Variation in a Multilayer Quasigeostrophic Model
(American Meteorological Society, 2012)ddy?zonal flow interactions in the annular modes are investigated in this study using a modified beta-plane multilayer quasigeostrophic (QG) channel model. This study shows the different response of high- and low-phase-speed ... -
Evaluation of Cloud Microphysics in JMA-NHM Simulations Using Bin or Bulk Microphysical Schemes through Comparison with Cloud Radar Observations
(American Meteorological Society, 2012)umerical weather prediction (NWP) simulations using the Japan Meteorological Agency Nonhydrostatic Model (JMA-NHM) are conducted for three precipitation events observed by shipborne or spaceborne W-band cloud radars. ... -
Monthly Diurnal Global Atmospheric Circuit Estimates Derived from Vostok Electric Field Measurements Adjusted for Local Meteorological and Solar Wind Influences
(American Meteorological Society, 2012)ocal temperature, wind speed, pressure, and solar wind?imposed influences on the vertical electric field observed at Vostok, Antarctica, are evaluated by multivariate analysis. Local meteorology can influence electric field ... -
Does the Holton–Tan Mechanism Explain How the Quasi-Biennial Oscillation Modulates the Arctic Polar Vortex?
(American Meteorological Society, 2012)dealized experiments with the Whole Atmosphere Community Climate Model (WACCM) are used to explore the mechanism(s) whereby the stratospheric quasi-biennial oscillation (QBO) modulates the Northern Hemisphere wintertime ... -
Effects of Three-Dimensional Photon Transport on the Radiative Forcing of Realistic Contrails
(American Meteorological Society, 2012)stimates of the global radiative forcing (RF) of line-shaped contrails and contrail cirrus exhibit a high level of uncertainty. In most cases, 1D radiative models have been used to determine the RF on a global scale. In ... -
Comments on “The Role of the Central Asian Mountains on the Midwinter Suppression of North Pacific Storminess”
(American Meteorological Society, 2011) -
Possible Dynamical Mechanisms for Southern Hemisphere Climate Change due to the Ozone Hole
(American Meteorological Society, 2012)he authors report a hypothesis for the dynamical mechanisms responsible for the strengthening of the Southern Hemisphere circumpolar winds from the lower stratosphere to the surface due to the ozone hole. A general circulation ... -
Interannual Variability of Indian Summer Monsoon arising from Interactions between Seasonal Mean and Intraseasonal Oscillations
(American Meteorological Society, 2012)significant fraction of interannual variability (IAV) of the Indian summer monsoon (ISM) is known to be governed by ?internal? dynamics arising from interactions between high-frequency fluctuations and the annual cycle. ... -
A Latent Heat Retrieval and Its Effects on the Intensity and Structure Change of Hurricane Guillermo (1997). Part II: Numerical Simulations
(American Meteorological Society, 2012)n Part I of this study, a new algorithm for retrieving the latent heat field in tropical cyclones from airborne Doppler radar was presented and fields from rapidly intensifying Hurricane Guillermo (1997) were shown. In ... -
Moist versus Dry Baroclinic Instability in a Simplified Two-Layer Atmospheric Model with Condensation and Latent Heat Release
(American Meteorological Society, 2011)he authors undertake a detailed analysis of the influence of water vapor condensation and latent heat release upon the evolution of the baroclinic instability. The framework consists in a two-layer rotating shallow-water ... -
Marine Boundary Layer Cloud Feedbacks in a Constant Relative Humidity Atmosphere
(American Meteorological Society, 2012)he mechanisms that govern the response of shallow cumulus, such as found in the trade wind regions, to a warming of the atmosphere in which large-scale atmospheric processes act to keep relative humidity constant are ... -
Effects of Parameterized Diffusion on Simulated Hurricanes
(American Meteorological Society, 2012)n this study the authors analyze and interpret the effects of parameterized diffusion on the nearly steady axisymmetric numerical simulations of hurricanes presented in a recent study. In that study it was concluded that ... -
Zonostrophic Instability
(American Meteorological Society, 2011)onostrophic instability leads to the spontaneous emergence of zonal jets on a ? plane from a jetless basic-state flow that is damped by bottom drag and driven by a random body force. Decomposing the barotropic vorticity ... -
The Influence of Wind Speed on Shallow Marine Cumulus Convection
(American Meteorological Society, 2011)he role of wind speed on shallow marine cumulus convection is explored using large-eddy simulations and concepts from bulk theory. Focusing on cases characteristic of the trades, the equilibrium trade wind layer is found ... -
Supervised Learning Approaches to Classify Sudden Stratospheric Warming Events
(American Meteorological Society, 2012)udden stratospheric warmings are prominent examples of dynamical wave?mean flow interactions in the Arctic stratosphere during Northern Hemisphere winter. They are characterized by a strong temperature increase on time ... -
Transient Tropospheric Forcing of Sudden Stratospheric Warmings
(American Meteorological Society, 2012)he amplitude of upward-propagating tropospherically forced planetary waves is known to be of first-order importance in producing sudden stratospheric warmings (SSWs). This forcing amplitude is observed to undergo strong ... -
An Observational Study on the Latitudes Where Wave Forcing Drives Brewer–Dobson Upwelling
(American Meteorological Society, 2012)he 40-yr ECMWF Re-Analysis (ERA-40) data are analyzed to demonstrate that wave forcing at lower latitudes plays a crucial role in driving the tropical upwelling portion of the Brewer?Dobson circulation. It is shown that ... -
Sensitivities of Orographic Precipitation to Terrain Geometry and Upstream Conditions in Idealized Simulations
(American Meteorological Society, 2011)his study examines how variations in relatively simple terrain geometries influence orographic precipitation and its spatial patterns of sensitivity to small changes in upstream conditions. An idealized three-dimensional ... -
Impacts of Ice Clouds on GPS Radio Occultation Measurements
(American Meteorological Society, 2012)athematical solutions accounting for the effects of liquid and ice clouds on the propagation of the GPS radio signals are first derived. The percentage contribution of ice water content (IWC) to the total refractivity ...