Search Results

You are looking at 61 - 70 of 564 items for :

  • Anthropogenic effects x
  • Journal of the Atmospheric Sciences x
  • All content x
Clear All
Takenari Kinoshita, Kaoru Sato, Kentaro Ishijima, Masayuki Takigawa, and Yousuke Yamashita

waves. Kinoshita and Sato (2014) extended the 3D TEM equations to equatorial waves. Finally, Noda (2010 , 2014 ) formulated a generalized 3D TEM equation for a plane wave under the Wentzel–Kramers–Brillouin (WKB) approximation. In the ocean dynamics, McDougall and McIntosh (1996 , 2001 ) formulated the temporal-residual-mean (TRM) flow using the conservation equations of mean density and density variance. The TRM flow includes not only the horizontal eddy flux of density but also the effects

Open access
Paquita Zuidema, Huiwen Xue, and Graham Feingold

changed due to increasing anthropogenic aerosol? Geophys. Res. Lett. , 28 , 3271 – 3274 . Pincus , R. , and M. Baker , 1994 : Effect of precipitation on the albedo susceptibility of clouds in the marine boundary layer. Nature , 372 , 250 – 252 . Pincus , R. , C. Hannay , and K. F. Evans , 2005 : The accuracy of determining three-dimensional radiative transfer effects in cumulus clouds using ground-based profiling instruments. J. Atmos. Sci. , 62 , 2284 – 2293 . Platnick , S

Full access
Kathleen K. Crahan, Dean A. Hegg, David S. Covert, Haflidi Jonsson, Jeffrey S. Reid, Djamal Khelif, and Barbara J. Brooks

properties, and the incorporation of the organic species into current aerosol hygroscopic models. In this paper we will concentrate on the organic component of the aerosol, exploring possible sources as well as their effects on the particle light scattering and aerosol hygroscopicity. We will also attempt to reproduce these observations using a thermodynamical model, based upon the chemical composition of the aerosols, that predicts the growth factor of the aerosol. 2. Methodology RED employed two

Full access
Andreas Muhlbauer and Ulrike Lohmann

, and W. Brown , 2003 : Mountaintop and radar measurements of anthropogenic aerosol effects on snow growth and snowfall rate. Geophys. Res. Lett. , 30 , 1538 . doi:10.1029/2002GL016855 . Bott , A. , 1989 : A positive definite advection scheme obtained by nonlinear renormalization of the advective fluxes. Mon. Wea. Rev. , 117 , 1006 – 1016 . Bougeault , P. , and Coauthors , 2001 : The MAP special observing period. Bull. Amer. Meteor. Soc. , 82 , 433 – 462 . Cantrell , W

Full access
William C. Keene, James N. Galloway, Gene E. Likens, Frank A. Deviney, Kerri N. Mikkelsen, Jennie L. Moody, and John R. Maben

1. Introduction Deposition to Earth’s surface is the major sink for soluble atmospheric constituents and an important source of nutrients (including N, P, and Fe) and toxic substances (e.g., Hg, Pb) for aquatic, terrestrial, and marine ecosystems. Relative to conditions prior to the industrial revolution, increases in the global human population, per capita resource usage, and associated demands for food and energy have driven significant increases in anthropogenic emissions of S, N, trace

Full access
James G. Hudson and Hongguo Li

.Charlson, R. J., S. E. Schwartz, J. M. Hales, R. D. Cess, J. A. Coakley Jr., J. E. Hansen, and D. J. Hofmann, 1992: Climate forcing by anthropogenic aerosols. Science, 255 (5043), 423-430.Cooper, W. A., 1988: Effects of coincidence on measurements with a forward scattering spectrometer probe. J. Atrnos. Oceanic Technol., 5, 823-832.Curry, J. A., 1986: Interactions among turbulence, radiation and mi crophysics in Arctic stratus clouds. J. Atmos. Sci., 43, 90-106.Fitzgerald, J. W., and P. A

Full access
Zhe Li, Huiwen Xue, Jen-Ping Chen, and Wei-Chyung Wang

the continent offshore, making the southeastern Pacific region highly affected by anthropogenic aerosols (e.g., Bretherton et al. 2004 ; Wood et al. 2011 ). The goal of this study is to investigate the effects of meteorological conditions and aerosols on stratocumulus using the Weather Research and Forecasting (WRF) Model. How cloud micro- and macrophysical properties respond to various meteorological parameters and aerosol mixing ratios has been investigated. The model and the experimental

Full access
Henry G. Reichle Jr. and Vickie S. Connors

1. Introduction Carbon monoxide (CO) has been shown to be photochemically active on the global scale, and it accounts for the majority of the destruction of the hydroxyl (OH) radical ( Logan et al. 1981 ). As a result, anthropogenic emissions of the gas have the potential for perturbing the chemistry of the global troposphere. These perturbations could have impact on global climate and stratospheric chemistry as a result of increasing methane, which is also destroyed by the OH radical. It is

Full access
Jonathan P. Taylor, Martin D. Glew, James A. Coakley Jr., William R. Tahnk, Steven Platnick, Peter V. Hobbs, and Ronald J. Ferek

clouds observed during the MAST campaign are very variable in their susceptibility and that this susceptibility can be used as an indicator of the sensitivity of the clouds to modification by anthropogenic pollution. Ship tracks have proven useful as a means of studying these processes in a confined region and have provided some quantitative measure of the possible magnitudes of these effects. Ship tracks themselves are not significant on climate scales because of their limited spatial extent

Full access
Joyce E. Penner and Frederick M. Luther

areplotted in constant pressure coordinates. Becausethe calculated local ozone changes are largest on apercentage basis at high altitude (for each of theperturbations considered), monitoring high-altitudeozone changes may provide an early warning signalfor anthropogenically caused ozone changes and amethod for validating models (NASA, 1049). It isimportant, therefore, to include the effects oftemperature feedback and changes in the airdensity when computing local changes in ozone forcomparison with

Full access