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    Soil Moisture Variability Intensifies and Prolongs Eastern Amazon Temperature and Carbon Cycle Response to El Niño–Southern Oscillation

    Source: Journal of Climate:;2018:;volume 032:;issue 004::page 1273
    Author:
    Levine, Paul A.
    ,
    Randerson, James T.
    ,
    Chen, Yang
    ,
    Pritchard, Michael S.
    ,
    Xu, Min
    ,
    Hoffman, Forrest M.
    DOI: 10.1175/JCLI-D-18-0150.1
    Publisher: American Meteorological Society
    Abstract: El Niño?Southern Oscillation (ENSO) is an important driver of climate and carbon cycle variability in the Amazon. Sea surface temperature (SST) anomalies in the equatorial Pacific drive teleconnections with temperature directly through changes in atmospheric circulation. These circulation changes also impact precipitation and, consequently, soil moisture, enabling additional indirect effects on temperature through land?atmosphere coupling. To separate the direct influence of ENSO SST anomalies from the indirect effects of soil moisture, a mechanism-denial experiment was performed to decouple their variability in the Energy Exascale Earth System Model (E3SM) forced with observed SSTs from 1982 to 2016. Soil moisture variability was found to amplify and extend the effects of SST forcing on eastern Amazon temperature and carbon fluxes in E3SM. During the wet season, the direct, circulation-driven effect of ENSO SST anomalies dominated temperature and carbon cycle variability throughout the Amazon. During the following dry season, after ENSO SST anomalies had dissipated, soil moisture variability became the dominant driver in the east, explaining 67%?82% of the temperature difference between El Niño and La Niña years, and 85%?91% of the difference in carbon fluxes. These results highlight the need to consider the interdependence between temperature and hydrology when attributing the relative contributions of these factors to interannual variability in the terrestrial carbon cycle. Specifically, when offline models are forced with observations or reanalysis, the contribution of temperature may be overestimated when its own variability is modulated by hydrology via land?atmosphere coupling.
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      Soil Moisture Variability Intensifies and Prolongs Eastern Amazon Temperature and Carbon Cycle Response to El Niño–Southern Oscillation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4262724
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    • Journal of Climate

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    contributor authorLevine, Paul A.
    contributor authorRanderson, James T.
    contributor authorChen, Yang
    contributor authorPritchard, Michael S.
    contributor authorXu, Min
    contributor authorHoffman, Forrest M.
    date accessioned2019-09-22T09:04:14Z
    date available2019-09-22T09:04:14Z
    date copyright12/6/2018 12:00:00 AM
    date issued2018
    identifier otherJCLI-D-18-0150.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262724
    description abstractEl Niño?Southern Oscillation (ENSO) is an important driver of climate and carbon cycle variability in the Amazon. Sea surface temperature (SST) anomalies in the equatorial Pacific drive teleconnections with temperature directly through changes in atmospheric circulation. These circulation changes also impact precipitation and, consequently, soil moisture, enabling additional indirect effects on temperature through land?atmosphere coupling. To separate the direct influence of ENSO SST anomalies from the indirect effects of soil moisture, a mechanism-denial experiment was performed to decouple their variability in the Energy Exascale Earth System Model (E3SM) forced with observed SSTs from 1982 to 2016. Soil moisture variability was found to amplify and extend the effects of SST forcing on eastern Amazon temperature and carbon fluxes in E3SM. During the wet season, the direct, circulation-driven effect of ENSO SST anomalies dominated temperature and carbon cycle variability throughout the Amazon. During the following dry season, after ENSO SST anomalies had dissipated, soil moisture variability became the dominant driver in the east, explaining 67%?82% of the temperature difference between El Niño and La Niña years, and 85%?91% of the difference in carbon fluxes. These results highlight the need to consider the interdependence between temperature and hydrology when attributing the relative contributions of these factors to interannual variability in the terrestrial carbon cycle. Specifically, when offline models are forced with observations or reanalysis, the contribution of temperature may be overestimated when its own variability is modulated by hydrology via land?atmosphere coupling.
    publisherAmerican Meteorological Society
    titleSoil Moisture Variability Intensifies and Prolongs Eastern Amazon Temperature and Carbon Cycle Response to El Niño–Southern Oscillation
    typeJournal Paper
    journal volume32
    journal issue4
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-18-0150.1
    journal fristpage1273
    journal lastpage1292
    treeJournal of Climate:;2018:;volume 032:;issue 004
    contenttypeFulltext
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    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian