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，大部分土壤剖面都悬浮在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。研究人员假设存在特殊的适应寒冷的微生物，它们产生甲烷，一种强效的温室气体，这些微生物在大部分土壤柱处于冰点的这一时期很活跃。研究人员还认为，这些特殊的微生物可能是每年从北极土壤释放到大气中的甲烷的很大一部分。这项研究将测试这种特殊的适应寒冷的甲烷产生微生物在这一时期是否活跃，如果是的话，它们对每年土壤甲烷通量的贡献有多大。为了验证这一假设，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，并为决策者提供更好的信息。该项目还将继续开展一个完善的外联项目，涉及阿拉斯加北坡和圣地亚哥的当地社区和学生。通量塔的测量显示，在北极的秋天，土壤剖面几乎是零摄氏度等温的时候，甲烷的排放量稳定而显著。研究人员认为，这种秋季通量是由生活在土壤柱中的专门的适应冷的产甲烷微生物群落维持的。这项研究将测试这种特殊的适应寒冷的产甲烷群落在这一时期是否活跃，如果是的话，它们对每年土壤甲烷外流的贡献有多大。拟议的研究包括野外同位素工作、实验室孵化、甲烷通量监测和建模。工作的建模方面是作为对前一个小组建议的回应而添加的。

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

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

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

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

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