Macall Hock

UC Davis

“Carbon Loss in Arctic Tundra Drainage Streams”

Arctic ecosystems play a crucial role in global carbon cycling, storing a significant proportion of the world’s soil carbon pool. As one of the fastest warming regions on Earth, the Arctic faces massive challenges related to carbon transport dynamics. Moreover, the exclusion of permafrost carbon emissions, particularly at the aquatic level, in most global carbon models emphasizes the critical need to understand the key factors influencing carbon dynamics in these streams. I aim to fill these knowledge gaps by addressing the environmental and landscape controls on carbon transport in Arctic headwater streams, which have been understudied in Arctic aquatic cycling. Headwater streams can account for as much as 80% of the total river length and 87% of the total riverine carbon dioxide emissions in this region making them a critical component to understanding how carbon is transported off the tundra that needs to be better quantified.


Macall’s doctoral work is on examining the effects of a warming Arctic ecosystem on stream carbon cycling in northern Alaska. Her project aims to quantify carbon transport across the tundra from drainage streams and determine how various landscape types and permafrost states might influence or control carbon fluxes.

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