Knowledge Resource Center for Ecological Environment in Arid Area
| Introducing a terrestrial carbon pool in desert bedrock mountains | |
| [null] | |
| 出版年 | 2013 |
| 学位授予单位 | Harrison, Emma Jayne (Author), Dorn, Ronald (Advisor), Reynolds, Stephen (Committee member), Schmeeckle, Mark (Committee member), Arizona State University (Publisher) |
| 英文摘要 | abstract: Growth of the Phoenix metropolitan area led to exposures of the internal bedrock structure of surrounding semi-arid mountain ranges as housing platforms or road cuts. Such exposures in the Sonoran and Mojave deserts reveal the presence of sedimentary calcium carbonate infilling the pre-existing fracture matrix of the bedrock. Field surveys of bedrock fractures filled with carbonate (BFFC) reveal an average of 0.079 +/- 0.024 mT C/m2 stored in the upper 2 m of analyzed bedrock exposures. Back-scattered electron microscopy images indicate the presence of carbonate at the micron scale, not included in this estimation. Analysis of the spatial extent of bedrock landforms in arid and semi-arid regions worldwide suggests that ~1485 GtC could potentially be stored in the upper 2 m horizon of BFFCs. Radiocarbon dating obtained at one of the sites indicates it is likely that some of the carbonate was flushed into the bedrock system during glacial wet pulses, and is stored on Pleistocene timescales or longer. Strontium isotope analysis at the same site suggest the potential for a substantial cation contribution from weathering of the local bedrock, indicating the potential exists for sequestration of atmospheric carbon in BFFCs. Rates of carbon release from BFFCs are tied to rates of erosion of bedrock ranges in desert climates. Dissertation/Thesis M.A. Geography 2013 |
| 英文关键词 | Geomorphology Arid geomorphology Carbon cycle Carbon sequestration Radiocarbon dating Strontium isotopes Weathering |
| 语种 | 英语 |
| URL | http://hdl.handle.net/2286/R.I.18039 |
| 来源机构 | Arizona State University |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/247695 |
| 推荐引用方式 GB/T 7714 | [null]. Introducing a terrestrial carbon pool in desert bedrock mountains[D]. Harrison, Emma Jayne (Author), Dorn, Ronald (Advisor), Reynolds, Stephen (Committee member), Schmeeckle, Mark (Committee member), Arizona State University (Publisher),2013. |
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