气候变化领域集成服务门户(CCPortal): Recent increases in annual, seasonal, and extreme methane fluxes driven by changes in climate and vegetation in boreal and temperate wetland ecosystems

CCPortal

DOI	10.1111/gcb.17131
	Recent increases in annual, seasonal, and extreme methane fluxes driven by changes in climate and vegetation in boreal and temperate wetland ecosystems
	Feron, Sarah; Malhotra, Avni; Bansal, Sheel; Fluet-Chouinard, Etienne; Mcnicol, Gavin; Knox, Sara H.; Delwiche, Kyle B.; Cordero, Raul R.; Ouyang, Zutao; Zhang, Zhen; Poulter, Benjamin; Jackson, Robert B.
发表日期	2024
ISSN	1354-1013
EISSN	1365-2486
起始页码	30
结束页码	1
卷号	30 期号:1
英文摘要	Climate warming is expected to increase global methane (CH4) emissions from wetland ecosystems. Although in situ eddy covariance (EC) measurements at ecosystem scales can potentially detect CH4 flux changes, most EC systems have only a few years of data collected, so temporal trends in CH4 remain uncertain. Here, we use established drivers to hindcast changes in CH4 fluxes (FCH4) since the early 1980s. We trained a machine learning (ML) model on CH4 flux measurements from 22 [methane-producing sites] in wetland, upland, and lake sites of the FLUXNET-CH4 database with at least two full years of measurements across temperate and boreal biomes. The gradient boosting decision tree ML model then hindcasted daily FCH4 over 1981-2018 using meteorological reanalysis data. We found that, mainly driven by rising temperature, half of the sites (n = 11) showed significant increases in annual, seasonal, and extreme FCH4, with increases in FCH4 of ca. 10% or higher found in the fall from 1981-1989 to 2010-2018. The annual trends were driven by increases during summer and fall, particularly at high-CH4-emitting fen sites dominated by aerenchymatous plants. We also found that the distribution of days of extremely high FCH4 (defined according to the 95th percentile of the daily FCH4 values over a reference period) have become more frequent during the last four decades and currently account for 10-40% of the total seasonal fluxes. The share of extreme FCH4 days in the total seasonal fluxes was greatest in winter for boreal/taiga sites and in spring for temperate sites, which highlights the increasing importance of the non-growing seasons in annual budgets. Our results shed light on the effects of climate warming on wetlands, which appears to be extending the CH4 emission seasons and boosting extreme emissions. Climate warming is expected to increase global methane emissions from wetland ecosystems. As in-situ tower measurements only span a few years, we used machine-learning to hindcast changes in methane emissions at 22 towers. In recent decades, we found that half of the sites showed significant increases in annual, seasonal, and extreme methane fluxes of at least 10%. Our results shed light on the effects of climate warming on wetlands, which appears to be extending methane emission seasons.
英文关键词	climate change; climate feedbacks; extreme fluxes; greenhouse gases; hindcasting; methane fluxes; wetlands
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:001145943100001
来源期刊	GLOBAL CHANGE BIOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306061
作者单位	University of Groningen; Stanford University; Universidad de Santiago de Chile; United States Department of Energy (DOE); Pacific Northwest National Laboratory; United States Department of the Interior; United States Geological Survey; United States Department of Energy (DOE); Pacific Northwest National Laboratory; University of Illinois System; University of Illinois Chicago; University of Illinois Chicago Hospital; University of British Columbia; McGill University; University of California System; University of California Berkeley; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; National Aeronautics & Space Administration (NASA); NASA Goddard Space Flight Center; Stanford University
推荐引用方式 GB/T 7714	Feron, Sarah,Malhotra, Avni,Bansal, Sheel,et al. Recent increases in annual, seasonal, and extreme methane fluxes driven by changes in climate and vegetation in boreal and temperate wetland ecosystems[J]. 中国科学院青藏高原研究所,2024,30(1).
APA	Feron, Sarah.,Malhotra, Avni.,Bansal, Sheel.,Fluet-Chouinard, Etienne.,Mcnicol, Gavin.,...&Jackson, Robert B..(2024).Recent increases in annual, seasonal, and extreme methane fluxes driven by changes in climate and vegetation in boreal and temperate wetland ecosystems.GLOBAL CHANGE BIOLOGY,30(1).
MLA	Feron, Sarah,et al."Recent increases in annual, seasonal, and extreme methane fluxes driven by changes in climate and vegetation in boreal and temperate wetland ecosystems".GLOBAL CHANGE BIOLOGY 30.1(2024).