期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms7911
关键词
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资金
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB03030404]
- National Basic Research Program of China [2013CB956303]
- National Natural Science Foundation of China [41125004]
- 111 Project [B14001]
- European Research Council Synergy grant [ERC-2013-SyG-610028]
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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