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Geography & Atmospheric Science Scholarly Works: Recent submissions

Now showing items 141-160 of 202

    • Assessment of variability in continental low stratiform clouds based on observations of radar reflectivity 

      Kogan, Zena N.; Mechem, David B.; Kogan, Yefim L. (American Geophysical Union, 2005-09-22)
      The variability of overcast low stratiform clouds observed over the ARM Climate Research Facility Southern Great Plains (ACRF SGP) site is analyzed, and an approach to characterizing subgrid variability based on assumed ...

    • Observations of Stratocumulus Clouds and Their Effect on the Eastern Pacific Surface Heat Budget along 20°S 

      de Szoeke, Simon P.; Yuter, Sandra E.; Mechem, David B.; Fairall, Chris W.; Burleyson, Casey D.; Zuidema, Paquita (American Meteorological Society, 2012-12-01)
      Widespread stratocumulus clouds were observed on nine transects from seven research cruises to the southeastern tropical Pacific Ocean along 20°S, 75°–85°W in October–November of 2001–08. The nine transects sample a unique ...

    • Thermodynamic and Aerosol Controls in Southeast Pacific Stratocumulus 

      Mechem, David B.; Yuter, Sandra E.; de Szoeke, Simon P. (American Meteorological Society, 2012-04-01)
      A near-large-eddy simulation approach with size-revolving (bin) microphysics is employed to evaluate the relative sensitivity of southeast Pacific marine boundary layer cloud properties to thermodynamic and aerosol parameters. ...

    • Multidimensional Longwave Forcing of Boundary Layer Cloud Systems 

      Mechem, David B.; Kogan, Yefim L.; Ovtchinnikov, Mikhail; Davis, Anthony B.; Evans, K. Franklin; Ellingson, Robert G. (American Meteorological Society, 2008-12-01)
      The importance of multidimensional (MD) longwave radiative effects on cloud dynamics is evaluated in an eddy-resolving model (ERM)—the two-dimensional analog to large-eddy simulation (LES)—framework employing multidimensional ...

    • Large-Eddy Simulation of Post-Cold-Frontal Continental Stratocumulus 

      Mechem, David B.; Kogan, Yefim L.; Schultz, David M. (American Meteorological Society, 2010-12-01)
      Previous large-eddy simulations (LES) of stratocumulus-topped boundary layers have been exclusively set in marine environments. Boundary layer stratocumulus clouds are also prevalent over the continent but have not been ...

    • Large-Eddy Observation of Post-Cold-Frontal Continental Stratocumulus 

      Mechem, David B.; Kogan, Yefim L.; Schultz, David M. (American Meteorological Society, 2010-10-01)
      More studies on the dynamics of marine stratus and stratocumulus clouds have been performed than comparable studies on continental stratocumulus. Therefore, to increase the number of observations of continental stratocumulus ...

    • Fidelity of Analytic Drop Size Distributions in Drizzling Stratiform Clouds Based on Large-Eddy Simulations 

      Kogan, Yefim L.; Kogan, Zena N.; Mechem, David B. (American Meteorological Society, 2009-08-01)
      Cloud microphysical parameterizations and retrievals rely heavily on knowledge of the shape of drop size distributions (DSDs). Many investigations assume that DSDs in the entire or partial drop size range may be approximated ...

    • Effects of Sea-Salt Aerosols on Precipitation in Simulations of Shallow Cumulus 

      Kogan, Yefim L.; Mechem, David B.; Choi, Kityan (American Meteorological Society, 2012-02-01)
      A suite of large-eddy simulations with size-resolving microphysical processes was performed in order to assess effects of sea-salt aerosols on precipitation process in trade cumulus. Simulations based on observations from ...

    • A Bulk Parameterization of Giant CCN 

      Mechem, David B.; Kogan, Yefim L. (American Meteorological Society, 2008-07-01)
      A parameterization for giant cloud condensation nuclei (GCCN), suitable for use in bulk microphysical models, has been developed that uses precise representations of the condensational growth of aerosol particles in the ...

    • Prospects of the WSR-88D Radar for Cloud Studies 

      Melnikov, Valery M.; Zrnić, Dusan S.; Doviak, Richard J.; Chilson, Phillip B.; Mechem, David B.; Kogan, Yefim L. (American Meteorological Society, 2011-04-01)
      Sounding of nonprecipitating clouds with the 10-cm wavelength Weather Surveillance Radar-1988 Doppler (WSR-88D) is discussed. Readily available enhancements to signal processing and volume coverage patterns of the WSR-88D ...

    • Controls on precipitation and cloudiness in simulations of trade-wind cumulus as observed during RICO 

      van Zanten, Margreet C.; Stevens, Bjorn; Nuijens, Louise; Siebesma, A. Pier; Ackerman, A. S.; Burnet, F.; Cheng, A.; Couvreux, F.; Jiang, H.; Khairoutdinov, M.; Kogan, Yefim L.; Lewellen, D. C.; Mechem, David B. (American Geophysical Union, 2011-06-28)
      Twelve large-eddy simulations, with a wide range of microphysical representations, are compared to each other and to independent measurements. The measurements and the initial and forcing data for the simulations are taken ...

    • Characteristics of warm season precipitating storms in the Arkansas–Red River basin 

      Tucker, Donna F.; Li, Xingong (American Geophysical Union, 2009-07-16)
      [1] Analysis of a multisensor precipitation product enables us to extract the precipitation from individual storms in the Arkansas–Red River drainage basin over a period of 11 years. We examine the year-to-year and ...

    • Recent advances in the climate change biology literature: describing the whole elephant 

      Peterson, A. Townsend; Menon, Shaily; Li, Xingong (Royal Meteorological Society, 2010-06-11)
      Climate change biology is seeing a wave of new contributions, which are reviewed herein. Contributions treat shifts in phenology and distribution, and both document past and forecast future effects. However, many of the ...

    • Facing the Future: Encouraging Critical Cartographic Literacies In Indigenous Communities 

      Johnson, Jay T.; Louis, Renee Pualani; Pramono, Albertus Hadi (University of British Columbia, Okanagan, 2005-01-01)
      As Indigenous academics researching and participating with various mapping initiatives, we have began to perceive that while many Indigenous communities have a long history of using Western cartographic techniques, including ...

    • Simulating the Biogeochemical and Biogeophysical Impacts of Transient Land Cover Change and Wood Harvest in the Community Climate System Model (CCSM4) from 1850 to 2100 

      Lawrence, Peter J.; Feddema, Johannes J.; Bonan, Gordon B.; Meehl, Gerald A.; O’Neill, Brian C.; Oleson, Keith W.; Levis, Samuel; Lawrence, David M.; Kluzek, Erik; Lindsay, Keith (American Meteorological Society, 2012-05-01)
      To assess the climate impacts of historical and projected land cover change in the Community Climate System Model, version 4 (CCSM4), new time series of transient Community Land Model, version 4 (CLM4) plant functional ...

    • Role of snow and glacier melt in controlling river hydrology in Liddar watershed (western Himalaya) under current and future climate 

      Jeelani, G.; Feddema, Johannes J.; van der Veen, Cornelis J.; Stearns, Leigh A. (American Geophysical Union, 2012-12-12)
      [1] Snowmelt and icemelt are believed to be important regulators of seasonal discharge of Himalayan rivers. To analyze the long term contribution of snowmelt and glacier/icemelt to river hydrology we apply a water budget ...

    • An examination of urban heat island characteristics in a global climate model 

      Oleson, Keith W.; Bonan, Gordon B.; Feddema, Johannes J.; Jackson, Trisha L. (Royal Meteorological Society, 2010-07-27)
      A parameterization for urban surfaces has been incorporated into the Community Land Model as part of the Community Climate System Model. The parameterization allows global simulation of the urban environment, in particular ...

    • Assessing Regional Climate and Local Landcover Impacts on Vegetation with Remote Sensing 

      Lin, Pei-Ling; Brunsell, Nathaniel A. (MDPI, 2013-09-09)
      Landcover change alters not only the surface landscape but also regional carbon and water cycling. The objective of this study was to assess the potential impacts of landcover change across the Kansas River Basin (KRB) by ...

    • Differential effects of extreme drought on production and respiration: synthesis and modeling analysis 

      Shi, Z.; Thomey, M. L.; Mowll, W.; Litvak, Marcy E.; Brunsell, Nathaniel A.; Collins, S. L.; Pockman, W. T.; Smith, M. D.; Knapp, A. K.; Luo, Y. (European Geosciences Union, 2014-02-04)
      Extremes in climate may severely impact ecosystem structure and function, with both the magnitude and rate of response differing among ecosystem types and processes. We conducted a modeling analysis of the effects of extreme ...

    • Spatial distribution of the risk of dengue fever in southeast Brazil, 2006-2007 

      Cordeiro, Ricardo; Donalisio, Maria Rita; Andrade, Valmir R.; Mafra, Ana C. N.; Nucci, Luciana B.; Brown, John C.; Stephan, Celso (BioMed Central, 2011-05-20)
      Background Many factors have been associated with circulation of the dengue fever virus and vector, although the dynamics of transmission are not yet fully understood. The aim of this work is to estimate the spatial ...