degradation at the land-ocean interface George Tanski, Michael - PowerPoint PPT Presentation

Permafrost carbon release and degradation at the land-ocean interface George Tanski, Michael Fritz, Justine Ramage, Christian Knoblauch, Nicole Couture, and Hugues Lantuit Herschel Island, Yukon, Canada

Background of northern landmass of global coasts km of coastline (Gt C org. ) Global carbon storage in soils TARNOCAI et al. 2009 George Tanski 1

Background of the coast are unlithified Erosion rates up to Herschel Island, Yukon Coast, Canada George Tanski 2

Background of the coast are unlithified Erosion rates up to Komakuk Beach, Yukon Coast, Canada George Tanski 3

Background of the coast are unlithified Erosion rates up to Herschel Island, Yukon, Canada Photo: J. WOLTER George Tanski 4

Topic I release... Dissolved organic carbon (DOC) OC ≤ 0.45 µm Particulate organic carbon (POC) Sediments George Tanski 5

Topic I: Release of DOC from ground ice Herschel Island Roland Bay Canada Study sites Kay Point Beaufort Sea (Arctic Ocean) Unglaciated Glaciated George Tanski 6

Topic I: Release of DOC from ground ice River discharge ** DOC: 1.3 Gg yr -1 POC: 2.1 Gg yr -1 Sediment: 127.0 Gg yr -1 Coastal erosion * DOC: ? SOC: 0.04 Gg yr -1 Sediment: 2.66 Gg yr -1 * MACDONALD et al. 1998 1 Gg = 10 12 g = 10 9 kg = 10 6 t ** COUTURE 2010 George Tanski 7

Topic I: Release of DOC from ground ice Ground ice content and types along the Yukon Coastal Plain • 37% ground ice C: 26% A+B: 11% After COUTURE 2010 A) Ice wedges B) Massive ice beds C) Pore/Non-massive intrasedimental ice George Tanski 8

Topic I: Release of DOC from ground ice Ground ice content and types along the Yukon Coastal Plain • 37% ground ice C: 26% A+B: 11% After COUTURE 2010 A) Ice wedges B) Massive ice beds A) B) C) C) Pore/Non-massive intrasedimental ice George Tanski 9

Topic I: Release of DOC from ground ice Calculation of DOC flux • n DOC storage = θj ∗ ρ ∗ DOCconc.j j=1 n DOC flux = lj ∗ hj ∗ Rj ∗ DOC storage j j=1 Modified, after COUTURE 2010 George Tanski 10

Topic I: Release of DOC from ground ice River discharge * DOC: 1.3 Gg yr -1 POC: 2.1 Gg yr -1 Sediment: 127.0 Gg yr -1 Coastal erosion ** DOC: 0.09 -3 Gg yr -1 SOC: 0.04 Gg yr -1 Sediment: 2.66 Gg yr -1 * MACDONALD et al. 1998 1 Gg = 10 12 g = 10 9 kg = 10 6 t ** COUTURE 2010 George Tanski 11

Topic I: Conclusion Low dissolved organic carbon fluxes from eroding permafrost coasts • Western part and Herschel Island are hotspots • Mostly fluxes from ice thrust moraine ridges and lacustrine deposits • Mostly as POC  DOC/POC ratio of ~1:1000 • OC input from the Mackenzie dominates the Beaufort Sea • But: High bioavailabilty of DOC assumed • Recent studies show high bioavailabilty • e.g. VONK et al. 2013  DOC loss > 34.0 ± 0.8% within two weeks • e.g. HOOD et al. 2009  45% of DOC terr. bioavailable • George Tanski 12

Topic II release... Dissolved organic carbon (DOC) OC ≤ 0.45 µm Particulate organic carbon (POC) Nutrients (NH 4 , NO 2 , NO 3 ) Sediments George Tanski 13

Topic II: Degradation of organic matter Herschel Island Slump D Canada Study site Beaufort Sea (Arctic Ocean) Unglaciated Glaciated George Tanski 14

Topic II: Degradation of organic matter Retrogressive thaw slump: „Slump D“ George Tanski 15

Topic II: Degradation of organic matter Evolution of „Slump D“ George Tanski 16

Topic II: Degradation of organic matter Vegetation classification of „Slump D“ based on NDVI George Tanski 17

Topic II: Degradation of organic matter DOC Surface/10cm depth 30cm depth George Tanski 18

Topic II: Degradation of organic matter DON Surface/10cm depth 30cm depth George Tanski 19

Topic II: Degradation of organic matter NH 4 Surface/10cm depth 30cm depth George Tanski 20

Topic II: Conclusion DOC conc. gradient from permafrost headwall to slump deposits •  Degradation of DOC right after thawing High ammonium conc. directly after thawing •  Indicator for quick depletion of organic material Strong degradtion of organic material at the land-ocean interface • George Tanski 21

Outlook and open questions What are the degradation mechanisms? What are the degradation patterns of POC ? What happens with permafrost carbon after transport into the ocean? What are possible impacts on nearshore marine nearshore ecosystem ? How is OC incorporated into local food webs ? George Tanski 22

PYRN PYRN celebratesf its 10 th anniversary • Just released its long-term strategy until 2018 • Is seeking to increase the network • More involvement of east asian partners planned • @ICOP 2016 big young researcher workshop planned • ICOP 2016 chance to be part of the new Executive Committee • You can apply for travel funding! • George Tanski 23

PYRN Improvement of the network • Census preparation in progress • Meet us at the poster session ! • Find us online or on facebook! • George Tanski 24

Thank you very much for the attention! Herschel Island, Yukon, Canada

degradation at the land-ocean interface George Tanski, Michael - PowerPoint PPT Presentation

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degradation at the land-ocean interface George Tanski, Michael - PowerPoint PPT Presentation

Permafrost carbon release and degradation at the land-ocean interface George Tanski, Michael Fritz, Justine Ramage, Christian Knoblauch, Nicole Couture, and Hugues Lantuit Herschel Island, Yukon, Canada Background of northern landmass of

The Economics of Land Degradation (ELD) Initiative Economic arguments to combat land degradation

Land Degradation Land Degradation Assessment in Cambodia Sovuthy Pheav, PhD (Agric. Sci.) Di

Neutrality and transformation? Land Degradation Neutrality &amp; possible chances for land

Economics of Land Degradation Insights fro In rom an evaluation study in in Bundelkhand by

Land Degradation and Restoration. Outline 1. Introduction to IPBES (item 1) Organisation of

Identifying drivers of land use change and type of degradation 1983 runn Ptursdttir

Achieving Land Degradation Neutrality in Landlocked Developing Countries: Challenges and

mobility in the context of land degradation by Marco Venier and Barbara Bendandi Presented at the

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Satellite monitoring of desertification INRIA project-team Clime July 13th, 2007 Land

Degradation and Restoration of Land and Ecosystems A Global Overview By WRI commissioned by the

Climate Biodiversity Land Change Loss Degradation Examples of impacts of each individual

UNCCD COP 14 DISSEMINATION AND LAND DEGRADATION NEUTRALITY (LDN) DIALOGUE RIDAR HOTEL, SEETA -

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Land Re Land Restoration in in La Latin in Am Ameri erica: : In Initi tiati tive 20x20

PV module degradation: the impact of light induced degradation (LID) and how to fix it! Dr.

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NCAR atmospheric component LANL ocean, land ice and sea ice MPAS-Atmosphere:

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