Publication Date:
2021-07-19
Description:
Although ponds make up roughly half of the total area of surface water in permafrost
landscapes, their relevance to carbon dioxide emissions on a landscape scale has,
to date, remained largely unknown. We have therefore investigated the inflows and
outflows of dissolved organic and inorganic carbon from lakes, ponds, and outlets on
Samoylov Island, in the Lena Delta of northeastern Siberia in September 2008, together
with their carbon dioxide emissions. Outgassing of carbon dioxide (CO2) from these ponds
and lakes, which cover 25% of Samoylov Island, was found to account for between 74 and
81% of the calculated net landscape-scale CO2 emissions of 0.2–1.1 g C m�2 d�1 during
September 2008, of which 28–43% was from ponds and 27–46% from lakes. The lateral
export of dissolved carbon was negligible compared to the gaseous emissions due to the
small volumes of runoff. The concentrations of dissolved inorganic carbon in the ponds
were found to triple during freezeback, highlighting their importance for temporary carbon
storage between the time of carbon production and its emission as CO2. If ponds are
ignored the total summer emissions of CO2-C from water bodies of the islands within the
entire Lena Delta (0.7–1.3 Tg) are underestimated by between 35 and 62%.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Article
,
isiRev
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