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    Impacts of Land-Use/Land-Cover Change on Afternoon Precipitation over North America

    Source: Journal of Climate:;2016:;volume( 030 ):;issue: 006::page 2121
    Author:
    Chen, Liang;Dirmeyer, Paul A.
    DOI: 10.1175/JCLI-D-16-0589.1
    Publisher: American Meteorological Society
    Abstract: AbstractThis study investigates the impacts of historical land-cover change on summer afternoon precipitation over North America using the Community Earth System Model. Using land?atmosphere coupling metrics, this study examines the sensitivity of afternoon atmospheric conditions to morning land surface states and fluxes that are altered by land-cover changes before and since 1850. The deforestation in the eastern United States prior to 1850 leads to increased latent but decreased sensible heat flux during the morning and a reduction in afternoon precipitation over the southern regions of the U.S. East Coast. The agricultural expansion over the Great Plains since preindustrial times shows similar effects on surface fluxes but results in a significant widespread increase in precipitation over the crop area. The coupling metrics exhibit a strong positive soil moisture?precipitation relationship over the Great Plains. Impacts of land-cover change on precipitation manifest through changes in rainfall frequency, rather than intensity, that are largely controlled by the distribution of CAPE as the trigger of convective precipitation. However, deforestation and later reforestation over the eastern United States, where coupling properties are different than the Great Plains, do not have as dominant an effect on afternoon precipitation. Additionally, precipitation over parts of the U.S. Southwest decreases in this model during the earlier period of East Coast deforestation, owing to changes in the large-scale circulation over North America driven by land-use changes prior to 1850.
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      Impacts of Land-Use/Land-Cover Change on Afternoon Precipitation over North America

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    contributor authorChen, Liang;Dirmeyer, Paul A.
    date accessioned2018-01-03T11:00:57Z
    date available2018-01-03T11:00:57Z
    date copyright12/7/2016 12:00:00 AM
    date issued2016
    identifier otherjcli-d-16-0589.1.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4246065
    description abstractAbstractThis study investigates the impacts of historical land-cover change on summer afternoon precipitation over North America using the Community Earth System Model. Using land?atmosphere coupling metrics, this study examines the sensitivity of afternoon atmospheric conditions to morning land surface states and fluxes that are altered by land-cover changes before and since 1850. The deforestation in the eastern United States prior to 1850 leads to increased latent but decreased sensible heat flux during the morning and a reduction in afternoon precipitation over the southern regions of the U.S. East Coast. The agricultural expansion over the Great Plains since preindustrial times shows similar effects on surface fluxes but results in a significant widespread increase in precipitation over the crop area. The coupling metrics exhibit a strong positive soil moisture?precipitation relationship over the Great Plains. Impacts of land-cover change on precipitation manifest through changes in rainfall frequency, rather than intensity, that are largely controlled by the distribution of CAPE as the trigger of convective precipitation. However, deforestation and later reforestation over the eastern United States, where coupling properties are different than the Great Plains, do not have as dominant an effect on afternoon precipitation. Additionally, precipitation over parts of the U.S. Southwest decreases in this model during the earlier period of East Coast deforestation, owing to changes in the large-scale circulation over North America driven by land-use changes prior to 1850.
    publisherAmerican Meteorological Society
    titleImpacts of Land-Use/Land-Cover Change on Afternoon Precipitation over North America
    typeJournal Paper
    journal volume30
    journal issue6
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-16-0589.1
    journal fristpage2121
    journal lastpage2140
    treeJournal of Climate:;2016:;volume( 030 ):;issue: 006
    contenttypeFulltext
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