气候变化领域集成服务门户(CCPortal): Recent climatic changes and wetland expansion turned Tibet into a net CH4 source

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DOI	10.1007/s10584-017-2069-y
	Recent climatic changes and wetland expansion turned Tibet into a net CH4 source
	Wei, Da; Wang, Xiaodan
通讯作者	Wang, XD (通讯作者)
发表日期	2017
ISSN	0165-0009
EISSN	1573-1480
起始页码	657
结束页码	670
卷号	144 期号:4
英文摘要	Methane (CH4) is the second largest contributor to the greenhouse effect. However, it remains unclear to what extent the CH4 cycle acts as a feedback to climate changes, due to insufficient observational constraints and poor knowledge of wetland extent dynamics. The Tibetan Plateau (TP), which has an average elevation of 4000+ m above sea level, contains one-third of China's natural wetlands. Rapid climate warming (i.e., 0.5 A degrees C per decade since the 1960s) and increasing precipitation in the region have caused wetlands to dry up and then expand, especially since the 2000s. In this study, we assessed the uncertainty and temporal variation of the CH4 budget during 1979-2012 using a biogeochemical model, in situ measurements and dynamic wetland maps. The results showed that the drying up of wetlands from the 1980s to 1990s completely counteracted the rising CH4 emission rates (0.75 +/- 0.18 and 0.77 +/- 0.19 Tg CH4 year(-1) in the 1980s and 1990s, respectively). However, recent precipitation-induced wetland expansion enhanced emissions to 0.96 +/- 0.21 Tg CH4 year(-1) in the 2000s, which exceeded the rate of CH4 uptake (0.74 +/- 0.06 Tg CH4 year(-1) in the 2000s). A nonlinear role played by wetland extent in the CH4 budget was revealed, suggesting that there is a need to incorporate wetland extent dynamics over a longer period into model simulations to understand the variation in wetland CH4 release during past decades. Furthermore, the results also indicate that more hydrological components, e.g., wetland shrinkage and expansion under increasing precipitation and glacial melt, should be taken into consideration when projecting wetland CH4 release on the TP.
关键词	NORTHERN HIGH-LATITUDES IN-SITU MEASUREMENTS METHANE EMISSIONS NATURAL WETLANDS BIOGEOCHEMISTRY MODEL ALPINE WETLANDS PLATEAU FLUXES CHINA DYNAMICS
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000411875800010
来源期刊	CLIMATIC CHANGE
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/258889
推荐引用方式 GB/T 7714	Wei, Da,Wang, Xiaodan. Recent climatic changes and wetland expansion turned Tibet into a net CH4 source[J]. 中国科学院青藏高原研究所,2017,144(4).
APA	Wei, Da,&Wang, Xiaodan.(2017).Recent climatic changes and wetland expansion turned Tibet into a net CH4 source.CLIMATIC CHANGE,144(4).
MLA	Wei, Da,et al."Recent climatic changes and wetland expansion turned Tibet into a net CH4 source".CLIMATIC CHANGE 144.4(2017).