Dre Stephanie Kusch - Tracing terrestrial organic matter export to the ocean: insights from compound-specific radiocarbon analysis in the Arctic and subtropics

seminaires

Dre Stephanie Kusch, ISMER-UQAR

Mardi 28 mars 2023 à 12h30 - Tuesday, March 28, 2023 at 12:30 pm

Local PK-6205, 6e étage, 201 ave. du Président-Kennedy

Résumé / abstract:

The burial of terrestrial organic matter in the ocean represents an effective mechanism to draw down atmospheric CO2. However, this pool of organic carbon (OC) is highly heterogenous and includes biospheric and petrogenic OC sub-pools that have different sources, reactivities, and atmospheric feedbacks. Moreover, terrestrial OC fluxes are changing in response to climate change and anthropogenic perturbation. In this talk, I will show how we can use molecular level 14C analysis to constrain the source and origin of terrestrial organic matter buried in marine sediments, disentangle OC pools, and quantify past and present organic matter fluxes to the ocean. We will explore how permafrost OC can be disentangled from petrogenic OC in Arctic fjords, and how biospheric and petrogenic OC fluxes change in response to catchment alterations and human activities in the subtropics.

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Tracing terrestrial organic matter export to the ocean: insights from compound-specific radiocarbon analysis in the Arctic and subtropics

Ajouter au calendrier 2023-03-28 12:30:00 2024-04-22 02:04:37 Dre Stephanie Kusch - Tracing terrestrial organic matter export to the ocean: insights from compound-specific radiocarbon analysis in the Arctic and subtropics The burial of terrestrial organic matter in the ocean represents an effective mechanism to draw down atmospheric CO2. However, this pool of organic carbon (OC) is highly heterogenous and includes biospheric and petrogenic OC sub-pools that have different sources, reactivities, and atmospheric feedbacks. Moreover, terrestrial OC fluxes are changing in response to climate change and anthropogenic perturbation. In this talk, I will show how we can use molecular level 14C analysis to constrain the source and origin of terrestrial organic matter buried in marine sediments, disentangle OC pools, and quantify past and present organic matter fluxes to the ocean. We will explore how permafrost OC can be disentangled from petrogenic OC in Arctic fjords, and how biospheric and petrogenic OC fluxes change in response to catchment alterations and human activities in the subtropics. Local PK-6205, 6e étage, 201 ave. du Président-Kennedy Geotop admin@example.com America/New_York public