Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028430 |
Spectral analysis of vertical temperature profile time‐series data in Yellowstone Lake sediments | |
Robert A. Sohn; Robert N. Harris | |
2021-03-17 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | We use yearlong vertical temperature profile timeseries (7 thermistors at evenly spaced depth intervals from 10‐70 cm) from five sites in and around the Deep Hole thermal area, southeast of Stevenson Island, Yellowstone Lake, to investigate heat and mass fluxes across the lake floor. The records demonstrate that thermal gradients in surficial sediments are modulated by a rich spectrum of bottom water temperature variations generated by hydrodynamic processes, and that sites inside the thermal area also respond to hydrothermal variations. We develop and implement a new method for estimating the sediment effective thermal diffusivity and pore fluid vertical flow rate that exploits the full spectrum of observed temperature variations to generate the parameter estimates, uncertainties, and metrics to assess statistical signficance. Sediments at sites outside thermal areas have gradients of ∼7.5 °C/m, in‐situ thermal diffusivities of ∼1.6 x 10‐7 m2/s consistent with highly porous (80‐90%) siliceous sediments, and experience hypolentic flow in the upper ∼20 cm. Sites inside the Deep Hole thermal area exhibit considerable spatial and temporal variabilty, with gradients of 1‐32 °C/m, and higher thermal diffusivities of ∼2‐12 x 10‐7 m2/s, consistent with hydrothermal alteration of biogenic silica to clays, quartz, and pyrite. Upward pore fluid flow at these sites is observed across multiple depth intervals, with maximum values of ∼3 cm/day. The observed spatial and temporal variability within the thermal area is consistent with upward finger flow combined with short wavelength convection within the porous sediments above a steam reservoir. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/319857 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Robert A. Sohn,Robert N. Harris. Spectral analysis of vertical temperature profile time‐series data in Yellowstone Lake sediments[J]. Water Resources Research,2021. |
APA | Robert A. Sohn,&Robert N. Harris.(2021).Spectral analysis of vertical temperature profile time‐series data in Yellowstone Lake sediments.Water Resources Research. |
MLA | Robert A. Sohn,et al."Spectral analysis of vertical temperature profile time‐series data in Yellowstone Lake sediments".Water Resources Research (2021). |
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