2001 至 2020 年全球湿地甲烷排放量:规模、动态和控制

IF 7.3 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Earths Future Pub Date : 2024-09-07 DOI:10.1029/2024EF004794
Han Xiao, Chaoqing Song, Shihua Li, Xiao Lu, Minqi Liang, Xiaosheng Xia, Wenping Yuan
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引用次数: 0

摘要

湿地生态系统是向大气排放甲烷的主要天然来源,在估算湿地生态系统的甲烷排放量时存在很大的不确定性,这严重阻碍了全球甲烷预算的量化。本研究使用 IBIS-CH4(综合生物圈模拟器-甲烷)模型来模拟 2001 年至 2020 年的全球湿地 CH4 排放量,该模型是一个基于过程的模型,集成了与 CH4 生成和氧化过程相关的微生物机制。最初,我们使用 IBIS-CH4 模型对其在全球 26 个不同湿地的性能进行了评估。结果表明,不同湿地观测到的甲烷通量的大小和季节性都得到了很好的再现。然后,我们使用该模型估算了 2001 年至 2020 年全球湿地 CH4 的年排放量,平均为 152.67 Tg CH4 yr-1,范围为 135.72-167.57 Tg CH4 yr-1。估计的全球湿地 CH4 排放量与目前自下而上的估计值(117-256 Tg CH4 yr-1)基本一致,并与独立的自上而下的估计值(139-183 Tg CH4 yr-1)密切重叠。2001-2020 年间,全球湿地 CH4 排放量估计值最初呈上升趋势,随后出现下降。CH4 排放的峰值出现在 2010 年,与湿地面积的峰值相吻合。全球湿地 CH4 排放量大部分集中在热带地区,并呈现出明显的季节性,在 7 月份达到峰值。气象因素对湿地CH4排放量的影响大于叶面积指数,表明土壤水热条件对湿地CH4排放量的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Global Wetland Methane Emissions From 2001 to 2020: Magnitude, Dynamics and Controls

Global Wetland Methane Emissions From 2001 to 2020: Magnitude, Dynamics and Controls

The large uncertainties in estimating CH4 emissions from wetland ecosystems, the leading natural source to the atmosphere, substantially hinder the quantification of the global CH4 budget. This study used the IBIS-CH4 (Integrated BIosphere Simulator-Methane) model, a process-based model integrating microbial mechanisms associated with CH4 production and oxidation processes, to simulate global wetland CH4 emissions from 2001 to 2020. Initially, we employed the IBIS-CH4 model to evaluate its performance across 26 diverse wetland sites worldwide. The results showed that the magnitude and seasonality of observed CH4 fluxes over various wetland sites were well reproduced. We then used this model to estimate the annual global wetland CH4 emissions from 2001 to 2020, averaging 152.67 Tg CH4 yr−1, with a range of 135.72–167.57 Tg CH4 yr−1. The estimated global wetland CH4 emissions are generally in agreement with the current bottom-up estimates (117–256 Tg CH4 yr−1) and closely overlap with independent top-down estimates (139–183 Tg CH4 yr−1). During 2001–2020, the estimated global wetland CH4 emissions initially showed an increasing trend, followed by a decline. The peak of CH4 emissions reached in 2010, coinciding with the peak of wetland area. The majority of global wetland CH4 emissions were concentrated in tropical regions, which exhibited a clear seasonality and had a peak in July. The impact of meteorological factors on wetland CH4 emissions was greater than that of leaf area index, indicating the importance of soil hydrothermal conditions on wetland CH4 emissions.

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来源期刊
Earths Future
Earths Future ENVIRONMENTAL SCIENCESGEOSCIENCES, MULTIDI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
11.00
自引率
7.30%
发文量
260
审稿时长
16 weeks
期刊介绍: Earth’s Future: A transdisciplinary open access journal, Earth’s Future focuses on the state of the Earth and the prediction of the planet’s future. By publishing peer-reviewed articles as well as editorials, essays, reviews, and commentaries, this journal will be the preeminent scholarly resource on the Anthropocene. It will also help assess the risks and opportunities associated with environmental changes and challenges.
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