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Microbes and Methanogenesis01:26

Microbes and Methanogenesis

Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
Deep Sea Microbial Ecology01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
Microbes and Climate Change01:27

Microbes and Climate Change

Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
Overview of Archaea01:29

Overview of Archaea

Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
Green Algae01:21

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
Microbial Mats01:25

Microbial Mats

Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...

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Updated: May 19, 2026

Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
08:18

Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions

Published on: June 12, 2016

南極大陸の下の潜在的なメタン貯蔵庫

J L Wadham1, S Arndt, S Tulaczyk

  • 1School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK. j.l.wadham@bris.ac.uk

Nature
|August 31, 2012
PubMed
まとめ

南極の亜氷河環境には,重要なメタン埋蔵量が存在し,世界のメタン予算に潜在的に影響を与える可能性があります. この研究は,南極の氷床の下でのメタン水合物形成の可能性を調査しています.

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Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer

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関連する実験動画

Last Updated: May 19, 2026

Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
08:18

Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions

Published on: June 12, 2016

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科学分野:

  • 地質科学は地質科学である.
  • 微生物学 微生物学とは
  • 気候科学 気候科学

背景:

  • 南極の氷河下の環境は,微生物の生命と有機炭素の貯蔵庫として認識されています.
  • 南極の氷床の下にあるメタノゲニックアーカイアによるメタン産生の可能性は,未評価のままである.
  • 有機炭素を大量に含んだ巨大な海洋沈殿盆が,南極の氷床の下に埋まっている.

研究 の 目的:

  • 南極の亜氷河堆積盆地におけるメタンの生産と蓄積の可能性を評価する.
  • 南極の氷の下での有機炭素をメタンに分解するメタノジェニックアーキアの役割を評価する.
  • メタン水酸化物の形成の可能性と,世界のメタン予算へのその貢献を決定する.

主な方法:

  • 他の亜氷河環境からの実験データにより,オーガニック物質のオーバーライドからメタンの生成が示されています.
  • 南極の盆地におけるメタンの蓄積を予測するために1D水素モデルを用いた数値シミュレーション.
  • 沈殿物の様々な深さでメタン水合物形成を好む圧力/温度条件の分析.

主要な成果:

  • 実験的証拠は,氷河で覆われた有機物質でメタンの生産の可能性を裏付けている.
  • シミュレーションでは,300m (西南極) と700m (東南極) 以下のメタン水合物形成に有利な条件を示しています.
  • サブ・南極圏のメタン水合物在庫は,北極圏の永久凍土の推定量と同等である可能性がある.

結論:

  • 南極の氷床は,世界のメタン予算に大きく貢献しているが,見過ごされているかもしれない.
  • メタン水素の蓄積は,有機炭素の分解と氷床の条件に依存して,南極の沈殿盆地では妥当である.
  • この氷床下メタンの潜在性は,氷床の浪費の間に気候温暖化に対する肯定的なフィードバックメカニズムとして機能する可能性があります.