KUKU

KU ScholarWorks

  • myKU
  • Email
  • Enroll & Pay
  • KU Directory
    • Login
    View Item 
    •   KU ScholarWorks
    • Dissertations and Theses
    • Dissertations
    • View Item
    •   KU ScholarWorks
    • Dissertations and Theses
    • Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Influence of Grassland Heterogeneity on Land-Atmosphere Coupling

    Thumbnail
    View/Open
    Logan_ku_0099D_15886_DATA_1.pdf (916.1Kb)
    Issue Date
    2018-05-31
    Author
    Logan, Kelly
    Publisher
    University of Kansas
    Format
    95 pages
    Type
    Dissertation
    Degree Level
    Ph.D.
    Discipline
    Atmospheric Science
    Rights
    Copyright held by the author.
    Metadata
    Show full item record
    Abstract
    Land surface processes and interactions with the atmosphere have been identified as a weak point in our understanding of the Earth's climate system and contribute to uncertainty in projections of future climate. This weakness is due, in part, to the inherent complexity of land-atmosphere (LA) interactions and the highly heterogeneous nature of land cover across a variety of spatial and temporal scales. The research included in this dissertation looks at the significance of these issues over a central US grassland. Influence of spatiotemporal variability is investigated through comparison between two proximate grassland sites with differing land cover. High-frequency observations from eddy covariance towers over a study period covering a range of environmental forcings, including two strong droughts and woody encroachment at one site provides a unique opportunity for study. First, changes in the water, energy, and carbon budgets are studied, with focus on the influence of woody encroachment on carbon sequestration, water-use efficiency, and drought response. How these changes manifest in the nature of turbulent fluxes, including at which spatial and temporal scales, are invested through deviations from similarity theory, quadrant analysis, and wavelet decomposition. Second, the nature of coupling between the land surface and atmosphere is studied by utilizing a variety of LA feedback metrics and analysis tools that allow for investigation of several steps in the LA feedback chain. This research includes the first use of some of these tools (self-organizing maps and mixing diagrams) in an study of this nature. Results indicate that woody encroachment increases resilience to drought due to changes in canopy structure and root access to soil moisture, and highlight the need to carefully consider scale and objective when selecting a metric of LA coupling.
    URI
    http://hdl.handle.net/1808/27890
    Collections
    • Dissertations [3958]

    Items in KU ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.


    We want to hear from you! Please share your stories about how Open Access to this item benefits YOU.


    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

    Browse

    All of KU ScholarWorksCommunities & CollectionsThis Collection

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

    The University of Kansas
      Contact KU ScholarWorks
    Lawrence, KS | Maps
     
    • Academics
    • Admission
    • Alumni
    • Athletics
    • Campuses
    • Giving
    • Jobs

    The University of Kansas prohibits discrimination on the basis of race, color, ethnicity, religion, sex, national origin, age, ancestry, disability, status as a veteran, sexual orientation, marital status, parental status, gender identity, gender expression and genetic information in the University’s programs and activities. The following person has been designated to handle inquiries regarding the non-discrimination policies: Director of the Office of Institutional Opportunity and Access, IOA@ku.edu, 1246 W. Campus Road, Room 153A, Lawrence, KS, 66045, (785)864-6414, 711 TTY.

     Contact KU
    Lawrence, KS | Maps