Short communication: Cosmogenic noble gas depletion in soils by wildfire heating

Balco, Greg; Hidy, Alan J.; Struble, William T.; Roering, Joshua J.

doi:10.5194/gchron-6-71-2024

Title: Short communication: Cosmogenic noble gas depletion in soils by wildfire heating

Journal Article · 20 February 2024 · Geochronology (Online)

DOI: https://doi.org/10.5194/gchron-6-71-2024 · OSTI ID:2325295

Balco, Greg ^[1]; Hidy, Alan J. ^[2];

^[3];

^[4]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Berkeley Geochronology Center, Berkeley, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
University of Arizona, Tucson, AZ (United States)
University of Oregon, Eugene, OR (United States)

Measurements of cosmic-ray-produced beryllium-10, neon-21, and helium-3 in quartz in a soil profile from a forested landscape in the Oregon Coast Range show that the cosmogenic noble gases ²¹Ne and ³He are depleted relative to 10Be in the shallow subsurface. The noble gases are mobile in mineral grains via thermally activated diffusion and ¹⁰Be is not, implying that noble gas depletion is the result of surface heating by wildfires and subsequent mixing of partially degassed quartz downward into the soil. Cosmogenic noble gas depletion by wildfire heating of soils is a potential means of estimating wildfire intensity and/or frequency over pre-observational timescales.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Anne and Gordon Getty Foundation

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2325295

Report Number(s):: LLNL--JRNL-852163; 1078773

Journal Information:: Geochronology (Online), Journal Name: Geochronology (Online) Journal Issue: 1 Vol. 6; ISSN 2628-3719

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: United States

Language:: English

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