Journal of the Atmospheric Sciences: Recent submissions
Now showing items 1921-1940 of 13215
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Isolating the Role of Surface Evapotranspiration on Moist Convection along the Eastern Flanks of the Tropical Andes Using a Quasi-Idealized Approach
(American Meteorological Society, 2014)he contribution of surface evapotranspiration (ET) to moist convection, cloudiness, and precipitation along the eastern flanks of the tropical Andes (EADS) was investigated using the Weather Research and Forecasting (WRF) ... -
Transition from Suppressed to Active Convection Modulated by a Weak Temperature Gradient–Derived Large-Scale Circulation
(American Meteorological Society, 2014)umerical simulations are performed to assess the influence of the large-scale circulation on the transition from suppressed to active convection. As a model tool, the authors used a coupled-column model. It consists of two ... -
Observation of Moisture Tendencies Related to Shallow Convection
(American Meteorological Society, 2014)ropospheric moisture is a key factor controlling the global climate and its variability. For instance, moistening of the lower troposphere is necessary to trigger the convective phase of a Madden?Julian oscillation (MJO). ... -
Influence of Liquid Water Content and Temperature on the Form and Growth of Branched Planar Snow Crystals in a Cloud
(American Meteorological Society, 2014)ow liquid water content (LWC) and temperature affect the growth of branched planar snow crystals is poorly understood. To address this issue, a vertical supercooled cloud tunnel was used to grow 167 individual snow crystals ... -
Why Do Model Tropical Cyclones Intensify More Rapidly at Low Latitudes?
(American Meteorological Society, 2014)he authors examine the problem of why model tropical cyclones intensify more rapidly at low latitudes. The answer to this question touches on practically all facets of the dynamics and thermodynamics of tropical cyclones. ... -
A High-Spectral-Resolution Radiative Transfer Model for Simulating Multilayered Clouds and Aerosols in the Infrared Spectral Region
(American Meteorological Society, 2014)fast and flexible model is developed to simulate the transfer of thermal infrared radiation at wavenumbers from 700 to 1300 cm?1 with a spectral resolution of 0.1 cm?1 for scattering?absorbing atmospheres. In a single run ... -
Decadal Relationship between European Blocking and the North Atlantic Oscillation during 1978–2011. Part I: Atlantic Conditions
(American Meteorological Society, 2014)oth the positive and negative phases of the North Atlantic Oscillation (NAO+ and NAO?, respectively) and atmospheric blocking in the Euro-Atlantic sector reflect synoptic variability over the region and thus are intrinsically ... -
Decadal Relationship between European Blocking and the North Atlantic Oscillation during 1978–2011. Part II: A Theoretical Model Study
(American Meteorological Society, 2014)n Part I of this study, it is revealed that decadal variations of European blocking, in its intensity, duration, and position, during 1978?2011 are modulated by decadal changes in the frequency of North Atlantic Oscillation ... -
Correlation between the Onset of the East Asian Subtropical Summer Monsoon and the Eastward Propagation of the Madden–Julian Oscillation
(American Meteorological Society, 2014)sing the daily outgoing longwave radiation (OLR), the pentad Climate Prediction Center Merged Analysis of Precipitation (CMAP), and the 6-h Climate Forecast System Reanalysis (CFSR) dataset from 1979 to 2010, a composite ... -
Aerosol Effects on Idealized Supercell Thunderstorms in Different Environments
(American Meteorological Society, 2014)dealized supercell thunderstorms are simulated with the Weather Research and Forecasting (WRF) Model at 15 cloud condensation nuclei (CCN) concentrations (100?10 000 cm?3) using four environmental soundings with different ... -
Impact of the Tropopause Temperature on the Intensity of Tropical Cyclones: An Idealized Study Using a Mesoscale Model
(American Meteorological Society, 2014)his study investigates the impact of the tropopause temperature on the intensity of idealized tropical cyclones (TCs) superimposed on background states of radiative?convective equilibrium (RCE) in a three-dimensional (3D) ... -
CORRIGENDUM
(American Meteorological Society, 2014) -
Graupel and Hail Terminal Velocities: Does a “Supercritical” Reynolds Number Apply?
(American Meteorological Society, 2014)his study characterizes the terminal velocities of heavily rimed ice crystals and aggregates, graupel, and hail using a combination of recent drag coefficient and particle bulk density observations. Based on a nondimensional ... -
Orographic Wave Drag over the Southern Ocean: A Linear Theory Perspective
(American Meteorological Society, 2014)ecent studies suggest that stratospheric wind biases in global and climate models in the Southern Hemisphere may result from insufficient orographic wave drag, particularly over the Southern Ocean in the latitude belt ... -
Linking Centennial Surface Warming Patterns in the Equatorial Pacific to the Relative Strengths of the Walker and Hadley Circulations
(American Meteorological Society, 2014)his study analyzes representative concentration pathway 4.5 projections by 18 models from phase 5 of the Coupled Model Intercomparison Project to show that surface warming patterns in the equatorial Pacific during the ... -
The Continuous Mutual Evolution of Equatorial Waves and the Quasi-Biennial Oscillation of Zonal Flow in the Equatorial Stratosphere
(American Meteorological Society, 2014)he continuous mutual evolution of equatorial waves and the background quasi-biennial oscillation (QBO) is demonstrated using daily NCEP?U.S. Department of Energy (DOE) reanalysis for the period from 1 January 1979 to 31 ... -
Vortex Preconditioning due to Planetary and Gravity Waves prior to Sudden Stratospheric Warmings
(American Meteorological Society, 2014)eanalysis data are used to evaluate the evolution of polar vortex geometry, planetary wave drag, and gravity wave drag prior to split versus displacement sudden stratospheric warmings (SSWs). A composite analysis that ... -
The Dynamics of Baroclinic Zonal Jets
(American Meteorological Society, 2014)ultiple alternating zonal jets are a ubiquitous feature of planetary atmospheres and oceans. However, most studies to date have focused on the special case of barotropic jets. Here, the dynamics of freely evolving baroclinic ... -
In situ Measurements of Momentum Fluxes in Typhoons
(American Meteorological Society, 2014)ne of the scientific objectives of the U.S. Office of Naval Research?sponsored Impact of Typhoons on the Ocean in the Pacific (ITOP) campaign was improved understanding of air?sea fluxes at high wind speeds. Here the authors ... -
Cyclogenesis Downstream of Extratropical Transition Analyzed by Q-Vector Partitioning Based on Flow Geometry
(American Meteorological Society, 2014)uring extratropical transition (ET), tropical cyclones exert a significant impact on the midlatitude circulation. Archetypical features of this impact are jet streak formation, amplification of the downstream trough, and ...