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<p>In summer 2021, the northern high-latitude plains (NHP) of the Eurasian continent endured their most severe drought in nearly two decades, with important implications for regional methane emissions. Using the Global ObservatioN-based system for monitoring Greenhouse GAses for methane (GONGGA-CH<sub>4</sub>) inversion system along with a merged Greenhouse gases Observing SATellite (GOSAT) + TROPOspheric Monitoring Instrument (TROPOMI) dataset, we quantified drought impacts on methane emissions. Independent validation confirmed the system’s high accuracy, revealing a 20% summer emission reduction in NHP during 2021 compared to baseline years. This reduction is primarily attributed to a decrease in liquid water content, which strongly affected wetland emissions. The underlying causes were heightened evaporation and the presence of a blocking high-pressure system within the atmospheric circulation. These findings highlight the profound impact of summer droughts on methane emissions in high-latitude regions, and emphasize the critical importance of integrating diverse data sources to refine methane emission estimates.</p>

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Rapid summer methane emission decline in high-latitude plains linked to 2021 drought

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月7日

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  • Min Zhao,
  • Xiangjun Tian,
  • Yilong Wang,
  • Yao Ge,
  • Zhe Jin,
  • Hongqin Zhang,
  • Jinzhi Ding,
  • Tao Wang

摘要

In summer 2021, the northern high-latitude plains (NHP) of the Eurasian continent endured their most severe drought in nearly two decades, with important implications for regional methane emissions. Using the Global ObservatioN-based system for monitoring Greenhouse GAses for methane (GONGGA-CH4) inversion system along with a merged Greenhouse gases Observing SATellite (GOSAT) + TROPOspheric Monitoring Instrument (TROPOMI) dataset, we quantified drought impacts on methane emissions. Independent validation confirmed the system’s high accuracy, revealing a 20% summer emission reduction in NHP during 2021 compared to baseline years. This reduction is primarily attributed to a decrease in liquid water content, which strongly affected wetland emissions. The underlying causes were heightened evaporation and the presence of a blocking high-pressure system within the atmospheric circulation. These findings highlight the profound impact of summer droughts on methane emissions in high-latitude regions, and emphasize the critical importance of integrating diverse data sources to refine methane emission estimates.