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.

北极秋季有很长一段时间，大部分土壤剖面都处于 0°C 附近。研究人员提出，每年的这个时候可能掌握着更好地了解北极生态系统如何受到气候变化影响所需的关键信息。研究人员认为，存在专门的适应寒冷的微生物，它们会产生甲烷（一种强效温室气体），并且这些微生物在大部分土壤柱处于冰点的时期很活跃。研究人员还认为，这些专门的微生物可能是活跃的。负责一个大该研究将测试这种专门的冷适应甲烷产生微生物在这一时期是否活跃，如果活跃，它们对每年土壤甲烷通量的贡献有多大。根据这一假设，本研究将进行现场、实验室和计算机模型模拟。该项目旨在预测北极将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。该项目也将继续下去。 - 制定了涉及当地的外展计划来自阿拉斯加和圣地亚哥北坡的社区和学生。通量塔测量显示，北极秋季的甲烷排放量稳定且显着，此时土壤剖面在零摄氏度下几乎等温。研究人员认为，秋季通量得以维持。该研究将测试这种专门的冷适应产甲烷微生物群落在此期间是否活跃，如果活跃，它们对每年土壤流出量的贡献有多大。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，作为对先前小组建议的回应。

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

Mechanistic Modeling of Microtopographic Impacts on CO 2 and CH 4 Fluxes in an Alaskan Tundra Ecosystem Using the CLM‐Microbe Model

使用 CLM–微生物模型建立阿拉斯加苔原生态系统中微地形对 CO 2 和 CH 4 通量影响的机制模型

• DOI: 10.1029/2019ms001771
• 发表时间: 2019
• 期刊: Journal of Advances in Modeling Earth Systems
• 影响因子: 6.8
• 作者: Wang, Yihui;Yuan, Fengming;Yuan, Fenghui;Gu, Baohua;Hahn, Melanie S.;Torn, Margaret S.;Ricciuto, Daniel M.;Kumar, Jitendra;He, Liyuan;Zona, Donatella
• 通讯作者: Zona, Donatella

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