Limited evidence that tropical inundation and precipitation powered the 2020-2022 methane surge.

IF 8.9 1区地球科学 Q1 ENVIRONMENTAL SCIENCES

Communications Earth & Environment Pub Date : 2025-01-01 Epub Date: 2025-06-10 DOI:10.1038/s43247-025-02438-3

Ying Xiong, Eric A Kort, A Anthony Bloom, Cynthia Gerlein-Safdi, Tianjiao Pu, Eren Bilir

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Abstract

Atmospheric methane is rapidly increasing, and the role of tropical wetlands in the global methane budget raises concerns about a potential climate-wetland-methane feedback. Here we use Cyclone Global Navigation Satellite System observations to map monthly inundation dynamics across the tropics (37.4°S to 37.4°N) at high resolution (0.01° × 0.01°) over five years (2018-2023), including cloud and vegetation-covered regions. Our results reveal large seasonal and interannual variations in wetland extent not captured in traditional inundation products, with strong El Niño-Southern Oscillation correlations. Tropical wetland models driven by these inundation observations, independent precipitation products, or constrained by total water observations do not show growth in wetland methane emissions from 2020-2022. This suggests the 2020-2022 growth in methane is best explained by other methane source or sink mechanisms, or that non-hydrological controls are more important in tropical wetland methane emissions than currently understood.

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有限的证据表明，热带洪水和降水推动了2020-2022年的甲烷激增。

大气中的甲烷正在迅速增加，热带湿地在全球甲烷收支中的作用引起了人们对潜在的气候-湿地-甲烷反馈的关注。本研究利用气旋全球导航卫星系统（Cyclone Global Navigation Satellite System）观测数据，以高分辨率（0.01°× 0.01°）绘制了5年（2018-2023年）热带地区（37.4°S至37.4°N）的月淹没动态图，包括云和植被覆盖地区。我们的研究结果揭示了传统淹没产品没有捕捉到的湿地范围的大的季节和年际变化，具有很强的El Niño-Southern振荡相关性。由这些淹没观测、独立降水产品驱动或受总水量观测约束的热带湿地模型并未显示2020-2022年湿地甲烷排放量的增长。这表明，其他甲烷源或汇机制可以最好地解释2020-2022年甲烷的增长，或者非水文控制在热带湿地甲烷排放中比目前所理解的更重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

8.60

自引率

2.50%

发文量

269

审稿时长

26 weeks

期刊介绍： Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.