Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-13903-2017 |
Vegetation greenness and land carbon-flux anomalies associated with climate variations: a focus on the year 2015 | |
Yue, Chao1; Ciais, Philippe1; Bastos, Ana1; Chevallier, Frederic1; Yin, Yi1; Roedenbeck, Christian2; Park, Taejin3 | |
2017-11-23 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:22 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Germany; USA |
英文摘要 | Understanding the variations in global land carbon uptake, and their driving mechanisms, is essential if we are to predict future carbon-cycle feedbacks on global environmental changes. Satellite observations of vegetation greenness have shown consistent greening across the globe over the past three decades. Such greening has driven the increasing land carbon sink, especially over the growing season in northern latitudes. On the other hand, interannual variations in land carbon uptake are strongly influenced by El Nino-Southern Oscillation (ENSO) climate variations. Marked reductions in land uptake and strong positive anomalies in the atmospheric CO2 growth rates occur during El Nino events. Here we use the year 2015 as a natural experiment to examine the possible response of land ecosystems to a combination of vegetation greening and an El Nino event. The year 2015 was the greenest year since 2000 according to satellite observations, but a record atmospheric CO2 growth rate also occurred due to a weaker than usual land carbon sink. Two atmospheric inversions indicate that the year 2015 had a higher than usual northern land carbon uptake in boreal spring and summer, consistent with the positive greening anomaly and strong warming. This strong uptake was, however, followed by a larger source of CO2 in the autumn. For the year 2015, enhanced autumn carbon release clearly offset the extra uptake associated with greening during the summer. This finding leads us to speculate that a long-term greening trend may foster more uptakes during the growing season, but no large increase in annual carbon sequestration. For the tropics and Southern Hemisphere, a strong transition towards a large carbon source for the last 3 months of 2015 is discovered, concomitant with El Nino development. This transition of terrestrial tropical CO2 fluxes between two consecutive seasons is the largest ever found in the inversion records. The strong transition to a carbon source in the tropics with the peak of El Nino is consistent with historical observations, but the detailed mechanisms underlying such an extreme transition remain to be elucidated. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416002000001 |
WOS关键词 | ATMOSPHERIC CO2 GROWTH ; NET PRIMARY PRODUCTION ; INTERANNUAL VARIABILITY ; NORTHERN ECOSYSTEMS ; DROUGHT SENSITIVITY ; SEMIARID ECOSYSTEMS ; CANOPY STRUCTURE ; FIRE EMISSIONS ; BOREAL FOREST ; TIME-SERIES |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/23849 |
专题 | 地球科学 |
作者单位 | 1.CEA, CNRS, UVSQ, UMR8212,LSCE, F-91191 Gif Sur Yvette, France; 2.Max Planck Inst Biogeochem, Jena, Germany; 3.Boston Univ, Dept Earth & Environm, Boston, MA 02215 USA |
推荐引用方式 GB/T 7714 | Yue, Chao,Ciais, Philippe,Bastos, Ana,et al. Vegetation greenness and land carbon-flux anomalies associated with climate variations: a focus on the year 2015[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(22). |
APA | Yue, Chao.,Ciais, Philippe.,Bastos, Ana.,Chevallier, Frederic.,Yin, Yi.,...&Park, Taejin.(2017).Vegetation greenness and land carbon-flux anomalies associated with climate variations: a focus on the year 2015.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(22). |
MLA | Yue, Chao,et al."Vegetation greenness and land carbon-flux anomalies associated with climate variations: a focus on the year 2015".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.22(2017). |
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