METHANE AT THE ZERO CURTAIN

甲烷处于零帷幕

• 批准号: 1702797
• 负责人: Donatella Zona
• 金额: $ 35万
• 依托单位: San Diego State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1702797&HistoricalAwards=false
• 关键词: METHANE; ZERO; CURTAIN

There is a long period during the Arctic fall, when much of the soil profile is suspended near 0°C. The investigators propose that this time of year may hold key information needed to better understand how Arctic ecosystems can be affected by climate change. The investigators hypothesize that there exist specialized cold-adapted microbes, which produce methane, a potent greenhouse gas, and that these microbes are active during this period when much of the soil column is at the freezing point. The investigators also argue that these specialized microbes may be responsible for a large fraction of the annual methane released from Arctic soils to the atmosphere. The study will test whether such specialized cold-adapted methane producing microbes are active during this period, and if so, how much they contribute to the annual soil flux of methane. To test this hypothesis, this study will bring to bear, field, laboratory, and computer model simulations.This project aims to predict how the Arctic will respond to current and future climate change, and to better inform decision makers. This project will also continue a well-developed outreach program involving local communities and students from the North Slope of Alaska and San Diego.Flux tower measurements have shown steady and significant methane emissions well into the Arctic fall, when the soil profile is nearly isothermal at zero degrees celsius. The investigators argue that this fall flux is maintained by specialized cold-adapted methanogenic microbial communities that live in the soil column. The study will test whether such specialized cold-adapted methanogenic communities are active during this period, and if so, how much they contribute to the annual soil efflux of methane. The proposed study includes field isotope work, laboratory incubations, methane flux monitoring, and modeling. The modeling aspect of the work was added as a response to suggestions from a previous panel.

在北极下降期间，有很长的时间，当时的大部分土壤剖面都悬挂在0°C附近。调查人员建议，一年中的这个时候可能会持有所需的关键信息，以更好地了解北极生态系统如何受到气候变化的影响。研究人员假设存在专门的冷适应微生物，该微生物产生了甲烷，潜在的温室气体，并且在此期间，当大部分土壤柱位于冰点处时，这些微生物是活跃的。研究人员还认为，这些专门的微生物可能是从北极土壤释放到大气的一年甲烷的很大一部分。该研究将测试在此期间，这种专门的冷适应甲烷产生的微生物是否活跃，如果是这样，它们对甲烷的年度土壤助产有多大贡献。为了检验这一假设，这项研究将带来熊，现场，实验室和计算机模型模拟。该项目旨在预测北极如何应对当前和未来的气候变化，并更好地为决策​​者提供信息。该项目还将继续进行一项完善的外展计划，涉及来自阿拉斯加北坡和圣地亚哥北坡的当地社区和学生。舒适塔的测量结果表明，当土壤在零摄氏度的零度时，土壤剖面几乎等于等于等于等于北极。研究人员认为，这种秋天的通量是由生活在土壤柱中的专门冷适应的甲烷生成微生物群落维持的。该研究将测试在此期间，这种专业的冷适应甲烷剂社区是否活跃，如果是这样，它们对甲烷的年度土壤排出有多大贡献。拟议的研究包括现场同位素工作，实验室孵化，甲烷通量监测和建模。添加了工作的建模方面，以回应以前面板的建议。

项目成果

Seasonality buffers carbon budget variability across heterogeneous landscapes in Alaskan Arctic tundra

• DOI: 10.1088/1748-9326/abe2d1
• 发表时间: 2021-02
• 期刊: Environmental Research Letters
• 影响因子: 6.7
• 作者: Josh Hashemi;D. Zona;K. Arndt;A. Kalhori;W. Oechel

Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra

• DOI: 10.1029/2017jg004227
• 发表时间: 2018-07
• 期刊: Journal of Geophysical Research: Biogeosciences
• 作者: E. Wilkman;D. Zona;Yanfei Tang;B. Gioli;D. Lipson;W. Oechel

Phosphorus alleviation of nitrogen‐suppressed methane sink in global grasslands

磷缓解氮抑制全球草原甲烷汇

• DOI: 10.1111/ele.13480
• 发表时间: 2020
• 期刊: Ecology Letters
• 影响因子: 8.8
• 作者: Zhang, Lihua;Yuan, Fenghui;Bai, Junhong;Duan, Hongtao;Gu, Xueying;Hou, Longyu;Huang, Yao;Yang, Mingan;He, Jin‐Sheng;Zhang, Zhenhua
• 通讯作者: Zhang, Zhenhua

Methyl-coenzyme M reductase alpha subunit (mcrA) transcripts from Arctic tundra soil near Utqiagvik, Alaska, 2018

2018 年阿拉斯加乌特恰格维克附近北极苔原土壤的甲基辅酶 M 还原酶 α 亚基 (mcrA) 转录本

• DOI: 10.18739/a2bk16q88
• 发表时间: 2021
• 期刊: NSF Arctic Data Center
• 作者: Lipson, David

Understanding spatial variability of methane fluxes in Arctic wetlands through footprint modelling

• DOI: 10.1088/1748-9326/ab4d32
• 发表时间: 2019-10
• 期刊: Environmental Research Letters
• 影响因子: 6.7
• 作者: K. Reuss-Schmidt;P. Levy;W. Oechel;C. Tweedie;C. Wilson;D. Zona