DOI: 10.1002/2015GL063044
论文题名: Natural variations in calcite dissolution rates in streams: Controls, implications, and open questions
作者: Covington M.D. ; Gulley J.D. ; Gabrovšek F.
刊名: Geophysical Research Letters
ISSN: 0094-8745
EISSN: 1944-8476
出版年: 2015
卷: 42, 期: 8 起始页码: 2836
结束页码: 2843
语种: 英语
英文关键词: bedrock channel
; catchment hydrology
; chemical variability
; dissolution
; karst
; magnitude and frequency
Scopus关键词: Calcite
; Catchments
; Erosion
; Silicate minerals
; Silicates
; Bedrock channels
; Catchment hydrology
; Chemical variability
; Karst
; Magnitude and frequency
; Dissolution
; bedrock
; calcite
; dissolution
; erosivity
; landform evolution
; landscape evolution
; rock property
; solubility
; streamflow
英文摘要: Models of bedrock channel evolution typically assume that chemical erosion is negligible in comparison to mechanical erosion. While this assumption is reasonable for channels in silicate rocks, it is questionable within highly soluble strata such as carbonates. The magnitude and variability of calcite dissolution rates in streams has remained as a critical unknown for models of bedrock incision and karst conduit formation. Here we use U.S. Geological Survey data to estimate calcite dissolution rates from 77 different streams located in a wide range of settings. The calculated rates are commonly on the order of ∼1 mmyr-1, which is 1 to 2 orders of magnitude larger than previous estimates. We also find that PCO2 is the strongest control on at-a-site variability, though some sites also display dilution-controlled variability. Typically, dissolution rates vary within a relatively narrow range, which has important implications for the relative importance of chemical and mechanical erosion. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929508782&doi=10.1002%2f2015GL063044&partnerID=40&md5=a8f11c659f2f2051e853919d8897927b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8361
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geosciences, University of Arkansas, Fayetteville, AR, United States
Recommended Citation:
Covington M.D.,Gulley J.D.,Gabrovšek F.. Natural variations in calcite dissolution rates in streams: Controls, implications, and open questions[J]. Geophysical Research Letters,2015-01-01,42(8).