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Title
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Leaf onset in the northern hemisphere triggered by daytime temperature
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Author
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Abstract
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| Recent warming significantly advanced leaf onset in the northern hemisphere. This signal cannot be accurately reproduced by current models parameterized by daily mean temperature (T-mean). Here using in situ observations of leaf unfolding dates (LUDs) in Europe and the United States, we show that the interannual anomalies of LUD during 1982-2011 are triggered by daytime (T-max) more than by nighttime temperature (T-min). Furthermore, an increase of 1 degrees C in T-max would advance LUD by 4.7 days in Europe and 4.3 days in the United States, more than the conventional temperature sensitivity estimated from T-mean. The triggering role of T-max, rather than the T-min or T-mean variable, is also supported by analysis of the large-scale patterns of satellite-derived vegetation green-up in spring in the northern hemisphere (>30 degrees N). Our results suggest a new conceptual framework of leaf onset using daytime temperature to improve the performance of phenology modules in current Earth system models. |
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Language
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English
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Source (journal)
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Nature communications
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Publication
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2015
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ISSN
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2041-1723
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DOI
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10.1038/NCOMMS7911
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Volume/pages
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6
(2015)
, 8 p.
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Article Reference
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6911
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ISI
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000353704100019
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Pubmed ID
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25903224
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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