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    Sensitivity of Climate to Changes in NDVI

    Source: Journal of Climate:;2000:;volume( 013 ):;issue: 013::page 2277
    Author:
    Bounoua, L.
    ,
    Collatz, G. J.
    ,
    Los, S. O.
    ,
    Sellers, P. J.
    ,
    Dazlich, D. A.
    ,
    Tucker, C. J.
    ,
    Randall, D. A.
    DOI: 10.1175/1520-0442(2000)013<2277:SOCTCI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The sensitivity of global and regional climate to changes in vegetation density is investigated using a coupled biosphere?atmosphere model. The magnitude of the vegetation changes and their spatial distribution are based on natural decadal variability of the normalized difference vegetation index (NDVI). Different scenarios using maximum and minimum vegetation cover were derived from satellite records spanning the period 1982?90. Albedo decreased in the northern latitudes and increased in the Tropics with increased NDVI. The increase in vegetation density revealed that the vegetation?s physiological response was constrained by the limits of the available water resources. The difference between the maximum and minimum vegetation scenarios resulted in a 46% increase in absorbed visible solar radiation and a similar increase in gross photosynthetic CO2 uptake on a global annual basis. This increase caused the canopy transpiration and interception fluxes to increase and reduced those from the soil. The redistribution of the surface energy fluxes substantially reduced the Bowen ratio during the growing season, resulting in cooler and moister near-surface climate, except when soil moisture was limiting. Important effects of increased vegetation on climate are a cooling of about 1.8 K in the northern latitudes during the growing season and a slight warming during the winter, which is primarily due to the masking of high albedo of snow by a denser canopy; and a year-round cooling of 0.8 K in the Tropics. These results suggest that increases in vegetation density could partially compensate for parallel increases in greenhouse warming. Increasing vegetation density globally caused both evapotranspiration and precipitation to increase. Evapotranspiration, however, increased more than precipitation, resulting in a global soil-water deficit of about 15%. A spectral analysis on the simulated results showed that changes in the state of vegetation could affect the low-frequency modes of the precipitation distribution and might reduce its low-frequency variability in the Tropics while increasing it in northern latitudes.
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      Sensitivity of Climate to Changes in NDVI

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4195090
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    contributor authorBounoua, L.
    contributor authorCollatz, G. J.
    contributor authorLos, S. O.
    contributor authorSellers, P. J.
    contributor authorDazlich, D. A.
    contributor authorTucker, C. J.
    contributor authorRandall, D. A.
    date accessioned2017-06-09T15:50:58Z
    date available2017-06-09T15:50:58Z
    date copyright2000/07/01
    date issued2000
    identifier issn0894-8755
    identifier otherams-5502.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4195090
    description abstractThe sensitivity of global and regional climate to changes in vegetation density is investigated using a coupled biosphere?atmosphere model. The magnitude of the vegetation changes and their spatial distribution are based on natural decadal variability of the normalized difference vegetation index (NDVI). Different scenarios using maximum and minimum vegetation cover were derived from satellite records spanning the period 1982?90. Albedo decreased in the northern latitudes and increased in the Tropics with increased NDVI. The increase in vegetation density revealed that the vegetation?s physiological response was constrained by the limits of the available water resources. The difference between the maximum and minimum vegetation scenarios resulted in a 46% increase in absorbed visible solar radiation and a similar increase in gross photosynthetic CO2 uptake on a global annual basis. This increase caused the canopy transpiration and interception fluxes to increase and reduced those from the soil. The redistribution of the surface energy fluxes substantially reduced the Bowen ratio during the growing season, resulting in cooler and moister near-surface climate, except when soil moisture was limiting. Important effects of increased vegetation on climate are a cooling of about 1.8 K in the northern latitudes during the growing season and a slight warming during the winter, which is primarily due to the masking of high albedo of snow by a denser canopy; and a year-round cooling of 0.8 K in the Tropics. These results suggest that increases in vegetation density could partially compensate for parallel increases in greenhouse warming. Increasing vegetation density globally caused both evapotranspiration and precipitation to increase. Evapotranspiration, however, increased more than precipitation, resulting in a global soil-water deficit of about 15%. A spectral analysis on the simulated results showed that changes in the state of vegetation could affect the low-frequency modes of the precipitation distribution and might reduce its low-frequency variability in the Tropics while increasing it in northern latitudes.
    publisherAmerican Meteorological Society
    titleSensitivity of Climate to Changes in NDVI
    typeJournal Paper
    journal volume13
    journal issue13
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2000)013<2277:SOCTCI>2.0.CO;2
    journal fristpage2277
    journal lastpage2292
    treeJournal of Climate:;2000:;volume( 013 ):;issue: 013
    contenttypeFulltext
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