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Quantifying Peat Carbon Mass Using Ground-Penetrating Radar (GPR) and Probing in Peatlands of the Kenai Peninsula, Alaska.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Quantifying Peat Carbon Mass Using Ground-Penetrating Radar (GPR) and Probing in Peatlands of the Kenai Peninsula, Alaska./
Author:	Kuhle, Cameron Ross.
Description:	1 online resource (61 pages)
Notes:	Source: Masters Abstracts International, Volume: 84-11.
Contained By:	Masters Abstracts International84-11.
Subject:	Environmental geology. -
Online resource:	click for full text (PQDT)
ISBN:	9798379509866

Quantifying Peat Carbon Mass Using Ground-Penetrating Radar (GPR) and Probing in Peatlands of the Kenai Peninsula, Alaska.
Kuhle, Cameron Ross.

Quantifying Peat Carbon Mass Using Ground-Penetrating Radar (GPR) and Probing in Peatlands of the Kenai Peninsula, Alaska. - 1 online resource (61 pages)

Source: Masters Abstracts International, Volume: 84-11.

Thesis (M.S.)--University of Alaska Anchorage, 2023.

Includes bibliographical references

Peat carbon (C) is known to be one of the largest pools of soil C globally and is sensitive to environmental and climatic changes. Peatlands in the Kenai National Wildlife Refuge (KNWR) have been studied for their hydrology, vegetation composition and succession, peat accumulation, and similar characteristics, but the mass of stored C is yet unknown. KNWR peatlands are expected to comprise significant reserves of sequestered C, thus we used a synthesis of soil and wetland surveying techniques to generate estimates of C mass at two sites selected for suitable topography and hydrology. After a probing campaign measuring peat depth at 208 points across both sites, a low-frequency (100 MHz) GPR instrument was utilized to identify peat basal horizons. Radar velocities (mean values 0.039 m/ns and 0.036 m/ns) were calibrated with probing depths to convert radar reflection travel times to depth measurements and ensure their accuracy. This method allowed the collection of many more data points than probing alone - two orders of magnitude greater (~23,000 traces over ~5 km) in half the time. Peat cores were extracted from each site and sampled at regular intervals for elemental analyses and Loss-OnIgnition testing conducted in UAA laboratories, and for dating. The analytical results C content and bulk density informed the primary study objective, while ancillary measures of C isotopes, organic matter content, nitrogen content, and 14C dating contextualize the data and illustrate historical trends. C content and bulk density were used to calculate total C mass given basin volume estimates calculated from ordinary kriging interpolations of the probe and GPR depth data. Estimates of C mass are 3,920 and 3,244 metric tons C for the two sites. Probing and combined (GPR and probing) interpolations were compared and significant reductions (one order of magnitude) in surface depth prediction error were noted in the results with GPR data. Comparable surface areas yield areal densities of approximately 2,000 and 1,500 metric tons C per hectare, respectively. Site conditions and properties differed between sites despite proximity and thus similar climatic influences; it is hypothesized these variances in bulk density, vegetation abundance and diversity, and surface water presence are subject to the influences of local topography, subsurface hydraulic connectivity, and the establishment history of peat-forming vegetation.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379509866Subjects--Topical Terms:

904653
Environmental geology.
Subjects--Index Terms:

Carbon massIndex Terms--Genre/Form:

554714
Electronic books.

Quantifying Peat Carbon Mass Using Ground-Penetrating Radar (GPR) and Probing in Peatlands of the Kenai Peninsula, Alaska.
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520 $a Peat carbon (C) is known to be one of the largest pools of soil C globally and is sensitive to environmental and climatic changes. Peatlands in the Kenai National Wildlife Refuge (KNWR) have been studied for their hydrology, vegetation composition and succession, peat accumulation, and similar characteristics, but the mass of stored C is yet unknown. KNWR peatlands are expected to comprise significant reserves of sequestered C, thus we used a synthesis of soil and wetland surveying techniques to generate estimates of C mass at two sites selected for suitable topography and hydrology. After a probing campaign measuring peat depth at 208 points across both sites, a low-frequency (100 MHz) GPR instrument was utilized to identify peat basal horizons. Radar velocities (mean values 0.039 m/ns and 0.036 m/ns) were calibrated with probing depths to convert radar reflection travel times to depth measurements and ensure their accuracy. This method allowed the collection of many more data points than probing alone - two orders of magnitude greater (~23,000 traces over ~5 km) in half the time. Peat cores were extracted from each site and sampled at regular intervals for elemental analyses and Loss-OnIgnition testing conducted in UAA laboratories, and for dating. The analytical results C content and bulk density informed the primary study objective, while ancillary measures of C isotopes, organic matter content, nitrogen content, and 14C dating contextualize the data and illustrate historical trends. C content and bulk density were used to calculate total C mass given basin volume estimates calculated from ordinary kriging interpolations of the probe and GPR depth data. Estimates of C mass are 3,920 and 3,244 metric tons C for the two sites. Probing and combined (GPR and probing) interpolations were compared and significant reductions (one order of magnitude) in surface depth prediction error were noted in the results with GPR data. Comparable surface areas yield areal densities of approximately 2,000 and 1,500 metric tons C per hectare, respectively. Site conditions and properties differed between sites despite proximity and thus similar climatic influences; it is hypothesized these variances in bulk density, vegetation abundance and diversity, and surface water presence are subject to the influences of local topography, subsurface hydraulic connectivity, and the establishment history of peat-forming vegetation.
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