| 项目编号: | 1500169
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| 项目名称: | Detecting the Signature of Permafrost Thaw in Arctic Rivers |
| 作者: | Robert Spencer
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| 承担单位: | Florida State University
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| 批准年: | 2013
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| 开始日期: | 2014-09-04
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| 结束日期: | 2017-01-31
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| 资助金额: | USD435075
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Polar
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| 英文关键词: | permafrost
; permafrost carbon
; continuous permafrost exposure
; arctic watershed
; arctic
; c signature
; subarctic/arctic river
; arctic coastal system
; downstream arctic river system
; northern permafrost region
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| 英文摘要: | Abstract
Global warming mobilization of the large (up to 50% of global) reservoirs of reduced organic carbon associated with northern permafrost regions of the Arctic, and conversion to radiatively important atmospheric (greenhouse) gases such as CO2 and CH4 presents a positive warming feed back of potentially considerable strength.
Currently there is a lack of understanding of how fast and to what extent this stored organic matter is microbially transformed within Arctic watersheds and Arctic coastal systems. Despite the marked ?old? (14C depleted) label of permafrost carbon compared to contemporary organic matter, the comparitive lack of an ?aged? C signature in the downstream Arctic river systems presents something of a conundrum. Further, the rapid remineralization of permafrost reduced carbon is not consistent with the notion that reduced (permafrost) carbon is recalcitrant.
This research aims to examine the partition, chemical and isotopic compositions, and ages of carbon species, including organic and inorganic/dissolved and particulate carbon, as well as lignin/lipid biomarkers in three subarctic/arctic rivers (Chena, Porcupine, and Sagavanirktok) and their basins. This will enable a comparison along a latitudinal gradient covering sporadic, discontinuous and continuous permafrost exposures, as well as along temporal scales from initial spring freshet to full summer and fall season and freeze-up. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/95505
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Robert Spencer. Detecting the Signature of Permafrost Thaw in Arctic Rivers. 2013-01-01.
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