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Title: Depth-Resolved Physicochemical Characteristics of Active Layer and Permafrost Soils in an Arctic Polygonal Tundra Region

Permafrost physicochemical parameters play a key role in controlling the response of permafrost carbon to climate change. We studied the physicochemical parameters of permafrost in an Arctic tundra region to evaluate (1) how soil parameters vary with depth and whether and how they are interrelated, (2) whether and how permafrost soil differs from its overlaying active layer, and (3) whether soil property-depth relationships are different across geomorphic features (e.g., low, flat, and high centered polygons). We also explored the possible biogeochemical processes that led to these soil characteristics and how they may affect biogeochemical reactions upon permafrost thaw. We observed (1) consistent relationships between soil property and depth and between major parameters, (2) large contrasts of key soil parameters between active layer and permafrost, indicative of potentially different response of the permafrost carbon to warming when compared to the active layer, and (3) a correlation between soil hydraulic conductivity and topographic features that impacts soil hydrologic processes. Our analysis suggests that the permafrost has a marine-derived chemical signature that differs from the active layer and shapes the physicochemical fingerprints of the different geomorphic features. Specifically, we revealed the unique signatures of the high center polygons, indicative of possible microbial activitymore » at depth (>1 m). Our study suggested consistent key soil parameter-depth correlations while demonstrating complex lateral and vertical variabilities. These results are valuable for identifying approaches to upscale point-based measurements and for improving model parameterization to predict permafrost carbon behavior and feedback under future climate.« less
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [2] ; ORCiD logo [1] ;  [3] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States); San Francisco Estuary Institute, Richmond, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; AC0205CH11231
Type:
Published Article
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 123; Journal Issue: 4; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; polygonal ground; active layer; permafrost; physical properties; pore water chemistry; hydraulic conductivity
OSTI Identifier:
1434798
Alternate Identifier(s):
OSTI ID: 1434799; OSTI ID: 1477276

Wu, Yuxin, Ulrich, Craig, Kneafsey, Timothy, Lopez, Robin, Chou, Chunwei, Geller, Jil, McKnight, Katie, Dafflon, Baptiste, Soom, Florian, Peterson, John, and Hubbard, Susan. Depth-Resolved Physicochemical Characteristics of Active Layer and Permafrost Soils in an Arctic Polygonal Tundra Region. United States: N. p., Web. doi:10.1002/2018JG004413.
Wu, Yuxin, Ulrich, Craig, Kneafsey, Timothy, Lopez, Robin, Chou, Chunwei, Geller, Jil, McKnight, Katie, Dafflon, Baptiste, Soom, Florian, Peterson, John, & Hubbard, Susan. Depth-Resolved Physicochemical Characteristics of Active Layer and Permafrost Soils in an Arctic Polygonal Tundra Region. United States. doi:10.1002/2018JG004413.
Wu, Yuxin, Ulrich, Craig, Kneafsey, Timothy, Lopez, Robin, Chou, Chunwei, Geller, Jil, McKnight, Katie, Dafflon, Baptiste, Soom, Florian, Peterson, John, and Hubbard, Susan. 2018. "Depth-Resolved Physicochemical Characteristics of Active Layer and Permafrost Soils in an Arctic Polygonal Tundra Region". United States. doi:10.1002/2018JG004413.
@article{osti_1434798,
title = {Depth-Resolved Physicochemical Characteristics of Active Layer and Permafrost Soils in an Arctic Polygonal Tundra Region},
author = {Wu, Yuxin and Ulrich, Craig and Kneafsey, Timothy and Lopez, Robin and Chou, Chunwei and Geller, Jil and McKnight, Katie and Dafflon, Baptiste and Soom, Florian and Peterson, John and Hubbard, Susan},
abstractNote = {Permafrost physicochemical parameters play a key role in controlling the response of permafrost carbon to climate change. We studied the physicochemical parameters of permafrost in an Arctic tundra region to evaluate (1) how soil parameters vary with depth and whether and how they are interrelated, (2) whether and how permafrost soil differs from its overlaying active layer, and (3) whether soil property-depth relationships are different across geomorphic features (e.g., low, flat, and high centered polygons). We also explored the possible biogeochemical processes that led to these soil characteristics and how they may affect biogeochemical reactions upon permafrost thaw. We observed (1) consistent relationships between soil property and depth and between major parameters, (2) large contrasts of key soil parameters between active layer and permafrost, indicative of potentially different response of the permafrost carbon to warming when compared to the active layer, and (3) a correlation between soil hydraulic conductivity and topographic features that impacts soil hydrologic processes. Our analysis suggests that the permafrost has a marine-derived chemical signature that differs from the active layer and shapes the physicochemical fingerprints of the different geomorphic features. Specifically, we revealed the unique signatures of the high center polygons, indicative of possible microbial activity at depth (>1 m). Our study suggested consistent key soil parameter-depth correlations while demonstrating complex lateral and vertical variabilities. These results are valuable for identifying approaches to upscale point-based measurements and for improving model parameterization to predict permafrost carbon behavior and feedback under future climate.},
doi = {10.1002/2018JG004413},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 4,
volume = 123,
place = {United States},
year = {2018},
month = {3}
}