Labile pyrogenic dissolved organic carbon in major Siberian Arctic rivers: Implications for wildfire-stream metabolic linkages

Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1002/2014GL062762

Ключевые слова: pyrogenic carbon, DOC, Arctic rivers, carbon cycling, Carbon, Combustion, Degradation, Fires, Organic carbon, Stream flow, Temperature, Watersheds, Dissolved organic carbon, First-order degradation rates, High-temperature combustion, Hydrologic events, Low temperatures, Rivers, anthropogenic effect, biomarker, biomass burning, concentration (composition), metabolism, water quality, watershed, wildfire, Siberia, Gymnospermae

Аннотация: Biomass burning produces a spectrum of thermally altered materials that releases pyrogenic carbon (PyC) to terrestrial, atmospheric, and aquatic systems. Most studies focus on the refractory end of the PyC spectrum, derived from middle- to high-temperature combustion. Low-temperature PyC is produced during wildfires and has been found to be particularly labile and water soluble. Here we find that in each of the major Siberian watersheds, low-temperature fire-derived biomarkers are present in detectable concentrations during all flow regimes of the 2004-2006 sampling period, confirming that PyC is an intrinsic component of the dissolved organic carbon (DOC) pool mobilized by hydrologic events. Gymnosperm combustion, from the southern portions of these watersheds, is the primary source of this Py-DOC input. Using first-order degradation rates and transit times of water through these rivers, about half of the total estimated flux of this material may be remineralized during transport from fire source to river mouth (20-40days), demonstrating the input of a labile source of PyC to these watersheds.

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Издание

Журнал: GEOPHYSICAL RESEARCH LETTERS

Выпуск журнала: Vol. 42, Is. 2

Номера страниц: 377-385

ISSN журнала: 00948276

Место издания: WASHINGTON

Издатель: AMER GEOPHYSICAL UNION

Авторы

  • Myers-Pigg A.N. (Department of Oceanography, Texas A and M University)
  • Louchouarn P. (Department of Marine Sciences, Texas A and M University)
  • Amon R.M.W. (Department of Marine Sciences, Texas A and M University)
  • Pierce K. (Department of Marine Sciences, Texas A and M University)
  • Prokushkin A. (Siberian Federal University)
  • Rubtsov A. (Siberian Federal University)

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