Now showing items 1005-1024 of 18256

    • Atmospheric chemistry in the Arctic and subarctic: Influence of natural fires, industrial emissions, and stratospheric inputs 

      Wofsy, Steven Charles; Sachse, G. W.; Gregory, G. L.; Blake, D. R.; Bradshaw, J. D.; Sandholm, S. T.; Singh, H. B.; Barrick, J. A.; Harriss, R. C.; Talbot, R. W.; Shipham, M. A.; Browell, E. V.; Jacob, Daniel James; Logan, Jennifer A. (Wiley-Blackwell, 1992)
      Haze layers with perturbed concentrations of trace gases, believed to originate from tundra and forest wild fires, were observed over extensive areas of Alaska and Canada in 1988. Enhancements of CH, CH, CH, CH, and CH ...
    • Atmospheric Circulation of Hot Jupiters: Coupled Radiative-dynamical General Circulation Model Simulations of Hd 189733b and Hd 209458b 

      Showman, Adam P.; Fortney, Jonathan J.; Lian, Yuan; Marley, Mark S.; Freedman, Richard S.; Knutson, Heather A.; Charbonneau, David (American Astronomical Society, 2009)
      We present global, three-dimensional numerical simulations of HD 189733b and HD 209458b that couple the atmospheric dynamics to a realistic representation of nongray cloud-free radiative transfer. The model, which we call ...
    • Atmospheric Circulation of Terrestrial Exoplanets 

      Showman, Adam P.; Wordsworth, Robin; Merlis, Timothy M.; Kaspi, Yohai
      The investigation of planets around other stars began with the study of gas giants, but is now extending to the discovery and characterization of super-Earths and terrestrial planets. Motivated by this observational tide, ...
    • Atmospheric Constraints on the Surface UV Environment of Mars at 3.9 Ga Relevant to Prebiotic Chemistry 

      Ranjan, Sukrit; Wordsworth, Robin; Sasselov, Dimitar D. (Mary Ann Liebert Inc, 2017)
      Recent findings suggest Mars may have been a clement environment for the emergence of life, and may even have compared favorably to Earth in this regard. These findings have revived interest in the hypothesis that prebiotically ...
    • Atmospheric deposition exposes Qinling pandas to toxic pollutants 

      Chen, Yi-ping; Zheng, Ying-juan; Liu, Qiang; Song, Yi; An, Zhi-sheng; Ma, Qing-yi; Ellison, Aaron M. (Wiley-Blackwell, 2017)
      The giant panda (Ailuropoda melanoleuca) is one of the most endangered animals in the world, and it is recognized worldwide as a symbol for conservation. A previous study showed that wild and captive pandas were exposed ...
    • Atmospheric distribution of 85 Kr simulated with a general circulation model 

      Jacob, Daniel James; Prather, Michael J.; Wofsy, Steven Charles; McElroy, Michael Brendon (Wiley-Blackwell, 1987)
      A three-dimensional chemical tracer model for the troposphere is used to simulate the global distribution of 85Kr, a long-lived radioisotope released at northern mid-latitudes by nuclear industry. Simulated distributions ...
    • Atmospheric Heat Redistribution and Collapse on Tidally Locked Rocky Planets 

      Wordsworth, Robin (IOP Publishing, 2015)
      Atmospheric collapse is likely to be of fundamental importance to tidally locked rocky exoplanets, but it remains understudied. Here, general results on the heat transport and stability of tidally locked terrestrial-type ...
    • Atmospheric hydrogen cyanide (HCN): Biomass burning source, ocean sink? 

      Li, Qinbin; Jacob, Daniel James; Bey, Isabelle; Yantosca, Robert M.; Zhao, Yongjing; Kondo, Yutaka; Notholt, Justus (Wiley-Blackwell, 2000)
      The observed seasonal amplitude of atmospheric HCN concentrations implies an atmospheric lifetime of only a few months for HCN, much shorter than is commonly assumed from oxidation by OH (a few years). We propose that ocean ...
    • Atmospheric nitrogen evolution on Earth and Venus 

      Wordsworth, Robin (Elsevier BV, 2016)
      Nitrogen is the most common element in Earth's atmosphere and also appears to be present in significant amounts in the mantle. However, its long-term cycling between these two reservoirs remains poorly understood. Here a ...
    • Atmospheric Opacity Has a Non-linear Effect on Global Crop Yields 

      Proctor, Jonathan (Springer Science and Business Media LLC, 2021-03-19)
      Agricultural impacts of air pollution, climate change and geoengineering remain uncertain due to potentially offsetting changes in the quantity and quality of sunlight. By leveraging year-to-year variation in growing season ...
    • Atmospheric Peroxyacetyl Nitrate (PAN): A Global Budget and Source Attribution 

      Fischer, E. V.; Jacob, Daniel James; Yantosca, Robert M.; Sulprizio, Melissa Payer; Millet, D. B.; Mao, J.; Paulot, F.; Singh, H. B.; Roiger, A.; Ries, L.; Talbot, R. W.; Dzepina, K.; Pandey Deolal, S. (Copernicus GmbH, 2014)
      Peroxyacetyl nitrate (PAN) formed in the atmospheric oxidation of non-methane volatile organic compounds (NMVOCs) is the principal tropospheric reservoir for nitrogen oxide radicals \((NO_x = NO + NO_2)\). PAN enables the ...
    • Atmospheric Phase Correction Using Total Power Radiometry at the Submillimeter Array 

      Battat, James Benjamin Royston; Blundell, Raymond; Moran, James M.; Paine, Scott (IOP Publishing, 2004)
      Phase noise caused by an inhomogeneous, time-variable water vapor distribution in our atmosphere reduces the angular resolution, visibility amplitude and coherence time of millimeter and submillimeter wavelength interferometers. ...
    • The atmospheric sulfur cycle over the Amazon Basin: 2. Wet season 

      Andreae, M. O.; Berresheim, H.; Bingemer, H.; Jacob, Daniel James; Lewis, B. L.; Li, S.-M.; Talbot, R. W. (Wiley-Blackwell, 1990)
      We determined the fluxes and concentrations of atmospheric sulfur species at ground level and from aircraft over the Amazon Basin during the 1987 wet season, providing a comprehensive description of the sulfur cycle over ...
    • An Atmospheric Teleconnection Linking ENSO and Southwestern European Precipitation 

      Shaman, Jeffrey; Tziperman, Eli (American Meteorological Society, 2011)
      Numerous studies have demonstrated statistical associations between the El Niño–Southern Oscillation (ENSO) and precipitation in the Mediterranean basin. The dynamical bases for these teleconnections have yet to be fully ...
    • Atom Interferometry Using Wave Packets with Constant Spatial Displacements 

      Su, Edward J.; Wu, Saijun; Prentiss, Mara (American Physical Society, 2010)
      A standing-wave light-pulse sequence is demonstrated that places atoms into a superposition of wave packets with precisely controlled displacements that remain constant for times as long as 1 s. The separated wave packets ...
    • Atom-by-atom nucleation and growth of graphene nanopores 

      Russo, Craig Anthony; Golovchenko, Jene Andrew (Proceedings of the National Academy of Sciences, 2012)
      Graphene is an ideal thin membrane substrate for creating molecule-scale devices. Here we demonstrate a scalable method for creating extremely small structures in graphene with atomic precision. It consists of inducing ...
    • Atom-like crystal defects: From quantum computers to biological sensors 

      Childress, Lilian I.; Walsworth, Ronald Lee; Lukin, Mikhail D. (AIP Publishing, 2014)
    • Atomic classification of 6D SCFTs 

      Heckman, Jonathan J.; Morrison, David R.; Rudelius, Tom; Vafa, Cumrun (Wiley-VCH Verlag, 2015)
      We use F-theory to classify possibly all six-dimensional super-conformal field theories (SCFTs). This involves a two step process: We first classify all possible tensor branches allowed in F-theory (which correspond to ...
    • Atomic Layer Deposited Zinc Tin Oxide Channel for Amorphous Oxide Thin Film Transistors 

      Heo, Jaeyeong; Kim, Sang Bok; Gordon, Roy Gerald (American Institute of Physics, 2012)
      Bottom-gate thin film transistors with amorphous zinc tin oxide channels were grown by atomic layer deposition (ALD). The films maintained their amorphous character up to temperatures over 500 \(^{\circ}\)C. The highest ...
    • Atomic layer depositied Indium oxy-sulfide on CZT(S,Se) absorbers 

      Jayaraman, Ashwin N Kr; Kim, Sang Bok; Gordon, Roy Gerald (2015)