气候变化领域集成服务门户(CCPortal): Estimation of subsurface porosities and thermal conductivities of polygonal tundra by coupled inversion of electrical resistivity, temperature, and moisture content data

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DOI	10.5194/tc-14-77-2020
	Estimation of subsurface porosities and thermal conductivities of polygonal tundra by coupled inversion of electrical resistivity, temperature, and moisture content data
	Jafarov E.E.; Harp D.R.; Coon E.T.; Dafflon B.; Phuong Tran A.; Atchley A.L.; Lin Y.; Wilson C.J.
发表日期	2020
ISSN	19940416
EISSN	14
起始页码	77
结束页码	91
卷号	14 期号:1
英文摘要	Studies indicate greenhouse gas emissions following permafrost thaw will amplify current rates of atmospheric warming, a process referred to as the permafrost carbon feedback. However, large uncertainties exist regarding the timing and magnitude of the permafrost carbon feedback, in part due to uncertainties associated with subsurface permafrost parameterization and structure. Development of robust parameter estimation methods for permafrost-rich soils is becoming urgent under accelerated warming of the Arctic. Improved parameterization of the subsurface properties in land system models would lead to improved predictions and a reduction of modeling uncertainty. In this work we set the groundwork for future parameter estimation (PE) studies by developing and evaluating a joint PE algorithm that estimates soil porosities and thermal conductivities from time series of soil temperature and moisture measurements and discrete in-time electrical resistivity measurements. The algorithm utilizes the Model-Independent Parameter Estimation and Uncertainty Analysis toolbox and coupled hydrological-thermal-geophysical modeling. We test the PE algorithm against synthetic data, providing a proof of concept for the approach. We use specified subsurface porosities and thermal conductivities and coupled models to set up a synthetic state, perturb the parameters, and then verify that our PE method is able to recover the parameters and synthetic state. To evaluate the accuracy and robustness of the approach we perform multiple tests for a perturbed set of initial starting parameter combinations. In addition, we varied types and quantities of data to better understand the optimal dataset needed to improve the PE method. The results of the PE tests suggest that using multiple types of data improve the overall robustness of the method. Our numerical experiments indicate that special care needs to be taken during the field experiment setup so that (1) the vertical distance between adjacent measurement sensors allows the signal variability in space to be resolved and (2) the longer time interval between resistivity snapshots allows signal variability in time to be resolved. © Author(s) 2020.
学科领域	data set; detection method; electrical resistivity; estimation method; permafrost; porosity; soil temperature; temperature effect; thermal conductivity; tundra; Arctic
语种	英语
scopus关键词	data set; detection method; electrical resistivity; estimation method; permafrost; porosity; soil temperature; temperature effect; thermal conductivity; tundra; Arctic
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118783
作者单位	Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, United States; Climate Change Science Institute and Environmental Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States; Climate and Ecosystem Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Department of Water Research Engineering and Technology, Water Research Institute, Hanoi, Viet Nam
推荐引用方式 GB/T 7714	Jafarov E.E.,Harp D.R.,Coon E.T.,et al. Estimation of subsurface porosities and thermal conductivities of polygonal tundra by coupled inversion of electrical resistivity, temperature, and moisture content data[J],2020,14(1).
APA	Jafarov E.E..,Harp D.R..,Coon E.T..,Dafflon B..,Phuong Tran A..,...&Wilson C.J..(2020).Estimation of subsurface porosities and thermal conductivities of polygonal tundra by coupled inversion of electrical resistivity, temperature, and moisture content data.The Cryosphere,14(1).
MLA	Jafarov E.E.,et al."Estimation of subsurface porosities and thermal conductivities of polygonal tundra by coupled inversion of electrical resistivity, temperature, and moisture content data".The Cryosphere 14.1(2020).