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    A Functional Response Metric for the Temperature Sensitivity of Tropical Ecosystems

    Source: Earth Interactions:;2018:;volume 022:;issue 007::page 1
    Author:
    Keppel-Aleks, Gretchen
    ,
    Basile, Samantha J.
    ,
    Hoffman, Forrest M.
    DOI: 10.1175/EI-D-17-0017.1
    Publisher: American Meteorological Society
    Abstract: AbstractEarth system models (ESMs) simulate a large spread in carbon cycle feedbacks to climate change, particularly in their prediction of cumulative changes in terrestrial carbon storage. Evaluating the performance of ESMs against observations and assessing the likelihood of long-term climate predictions are crucial for model development. Here, we assessed the use of atmospheric growth rate variations to evaluate the sensitivity of tropical ecosystem carbon fluxes to interannual temperature variations. We found that the temperature sensitivity of the observed growth rate depended on the time scales over which atmospheric observations were averaged. The temperature sensitivity of the growth rate during Northern Hemisphere winter is most directly related to the tropical carbon flux sensitivity since winter variations in Northern Hemisphere carbon fluxes are relatively small. This metric can be used to test the fidelity of interactions between the physical climate system and terrestrial ecosystems within ESMs, which is especially important since the short-term relationship between ecosystem fluxes and temperature stress may be related to the long-term feedbacks between ecosystems and climate. If the interannual temperature sensitivity is used to constrain long-term temperature responses, the inferred sensitivity may be biased by 20%, unless the seasonality of the relationship between the observed growth rate and tropical fluxes is taken into account. These results suggest that atmospheric data can be used directly to evaluate regional land fluxes from ESMs, but underscore that the interaction between the time scales for land surface processes and those for atmospheric processes must be considered.
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      A Functional Response Metric for the Temperature Sensitivity of Tropical Ecosystems

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4261540
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    contributor authorKeppel-Aleks, Gretchen
    contributor authorBasile, Samantha J.
    contributor authorHoffman, Forrest M.
    date accessioned2019-09-19T10:06:05Z
    date available2019-09-19T10:06:05Z
    date copyright3/29/2018 12:00:00 AM
    date issued2018
    identifier otherei-d-17-0017.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4261540
    description abstractAbstractEarth system models (ESMs) simulate a large spread in carbon cycle feedbacks to climate change, particularly in their prediction of cumulative changes in terrestrial carbon storage. Evaluating the performance of ESMs against observations and assessing the likelihood of long-term climate predictions are crucial for model development. Here, we assessed the use of atmospheric growth rate variations to evaluate the sensitivity of tropical ecosystem carbon fluxes to interannual temperature variations. We found that the temperature sensitivity of the observed growth rate depended on the time scales over which atmospheric observations were averaged. The temperature sensitivity of the growth rate during Northern Hemisphere winter is most directly related to the tropical carbon flux sensitivity since winter variations in Northern Hemisphere carbon fluxes are relatively small. This metric can be used to test the fidelity of interactions between the physical climate system and terrestrial ecosystems within ESMs, which is especially important since the short-term relationship between ecosystem fluxes and temperature stress may be related to the long-term feedbacks between ecosystems and climate. If the interannual temperature sensitivity is used to constrain long-term temperature responses, the inferred sensitivity may be biased by 20%, unless the seasonality of the relationship between the observed growth rate and tropical fluxes is taken into account. These results suggest that atmospheric data can be used directly to evaluate regional land fluxes from ESMs, but underscore that the interaction between the time scales for land surface processes and those for atmospheric processes must be considered.
    publisherAmerican Meteorological Society
    titleA Functional Response Metric for the Temperature Sensitivity of Tropical Ecosystems
    typeJournal Paper
    journal volume22
    journal issue7
    journal titleEarth Interactions
    identifier doi10.1175/EI-D-17-0017.1
    journal fristpage1
    journal lastpage20
    treeEarth Interactions:;2018:;volume 022:;issue 007
    contenttypeFulltext
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