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    The Impact of Observed Vegetation Changes on Land–Atmosphere Feedbacks During Drought

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    jhm-d-13-01301.pdf
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    Type
    Article
    Authors
    Meng, X. H.
    Evans, J. P. cc
    McCabe, Matthew cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2014-04
    Permanent link to this record
    http://hdl.handle.net/10754/552740
    
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    Abstract
    Moderate Resolution Imaging Spectroradiometer (MODIS)-derived vegetation fraction data were used to update the boundary conditions of the advanced research Weather Research and Forecasting (WRF) Model to assess the influence of realistic vegetation cover on climate simulations in southeast Australia for the period 2000–08. Results show that modeled air temperature was improved when MODIS data were incorporated, while precipitation changes little with only a small decrease in the bias. Air temperature changes in different seasons reflect the variability of vegetation cover well, while precipitation changes have a more complicated relationship to changes in vegetation fraction. Both MODIS and climatology-based simulation experiments capture the overall precipitation changes, indicating that precipitation is dominated by the large-scale circulation, with local vegetation changes contributing variations around these. Simulated feedbacks between vegetation fraction, soil moisture, and drought over southeast Australia were also investigated. Results indicate that vegetation fraction changes lag precipitation reductions by 6–8 months in nonarid regions. With the onset of the 2002 drought, a potential fast physical mechanism was found to play a positive role in the soil moisture–precipitation feedback, while a slow biological mechanism provides a negative feedback in the soil moisture–precipitation interaction on a longer time scale. That is, in the short term, a reduction in soil moisture leads to a reduction in the convective potential and, hence, precipitation, further reducing the soil moisture. If low levels of soil moisture persist long enough, reductions in vegetation cover and vigor occur, reducing the evapotranspiration and thus reducing the soil moisture decreases and dampening the fast physical feedback. Importantly, it was observed that these feedbacks are both space and time dependent.
    Citation
    The Impact of Observed Vegetation Changes on Land–Atmosphere Feedbacks During Drought 2014, 15 (2):759 Journal of Hydrometeorology
    Publisher
    American Meteorological Society
    Journal
    Journal of Hydrometeorology
    DOI
    10.1175/JHM-D-13-0130.1
    Additional Links
    http://journals.ametsoc.org/doi/abs/10.1175/JHM-D-13-0130.1
    ae974a485f413a2113503eed53cd6c53
    10.1175/JHM-D-13-0130.1
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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