Coastal Evolution in Sedimentary Areas in Greenland
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1 Coastal Evolution in Sedimentary Areas in Greenland Mette Bendixen P h D s t u d e n t DANCORE Young Professionals Day Dias 1
2 Outline Motivation State of the art on Arctic coasts Purpose of my Phd Presentation of the two study areas Results Conclusion
3 FOR PERMAFROST (CENPERM) Motivation: Climate is changing warming in the Arctic is stronger Dias 3
4 FOR PERMAFROST (CENPERM) Motivation: Climate is changing glaciers are retreating Bjørk et al DOI: /NGEO1481 Dias 4
5 FOR PERMAFROST (CENPERM) Motivation: Climate is changing sea ice extent is thinning and diminishing Peter Wadhams, Polar Ocean Physics Group, Cambridge Dias 5
6 FOR PERMAFROST (CENPERM) Climate is changing and sets off several processes: Increasing pressure on coastal areas Dias 6
7 FOR PERMAFROST (CENPERM) Climate is changing and sets off several processes: Increasing pressure on coastal areas Changing depositional patterns Shifting coastal fluxes to the oceans Altering sediment and nutrient pathways Dias 7
8 Arctic coasts: tundra Coastal plain in Alaska and Siberia Dias 8
9 Coastal plain in Alaska and Siberia Dias 9
10 State of art on Arctic coasts Coastal plain Greenland Dias 10
11 FOR PERMAFROST (CENPERM) State of art on Arctic coasts Lantuiet et al DOI /s Dias 11
12 FOR PERMAFROST (CENPERM) State of art on Arctic coasts m/yr m/yr m/yr m/yr?! Lantuiet et al DOI /s Dias 12
13 Aims Quantify rates (m 3 /y) of shoreline changes and fluxes of eroded sediment and nutrient in permafrost-affected areas in Greenland Dias 13
14 Aims Quantify rates (m 3 /y) of shoreline changes and fluxes of eroded sediment and nutrient in permafrost-affected areas in Greenland Specify the parameters responsible for shoreline changes in a warming Arctic climate Dias 14
15 Study areas sedimentary coasts Young Sound Continuous permafrost South-eastern Disko Island Discontinuous permafrost Dias 15
16 FOR PERMAFROST (CENPERM) Study area sedimentary coasts, Disko Island, W Gr. Sedimentary coasts ~20 % (10% deltas) Dias 16
17 FOR PERMAFROST (CENPERM) Study area sedimentary coasts, Young Sound, NE Gr. Dias 17
18 Aim 1 Quantify rates of shoreline changes and sediment and nutrient fluxes in permafrost-affected areas Identification of geomorphological features - beach ridges, tombolos, pocket beaches, spits, deltas Identification of coastal changes Methods Aerial photos and satellite images Coastal change detection method Dias 18
19 Results Morphological mapping, Disko Dias 19
20 Results Morphological mapping, Young Sound Dias 20
21 Methods detection of shoreline changes 1932 Dias 21
22 Methods detection of shoreline changes Dias 22
23 Methods detection of shoreline changes 1932 Dias
24 Methods detection of shoreline changes Aerial photos Rectification and georeferencing Shoreline detection Shoreline changes Dias 24
25 Results Detection of shoreline changes Disko Island 1964: aerial photo 1985: orthophoto Skansen 2012: satellite image Dias 25
26 Results Detection of shoreline changes Skansen, Disko Island 1964 Skansen Dias 26
27 Results Detection of coastal changes Zackenberg delta CENTER FOR PERMAFROST (CENPERM) Meters Dias 27
28 Preliminary results Detection of coastal changes Zackenberg delta CENTER FOR PERMAFROST (CENPERM) Meters Dias 28
29 Preliminary results - Detection of coastal changes Zackenberg delta CENTER FOR PERMAFROST (CENPERM) Meters 19 m Dias 29
30 Aim 2 Specify the parameters responsible for shoreline changes in a warming Arctic climate Methods Identification of parameters influencing coastal changes - strengths and stresses Dias 30
31 Aim 2 Specify the parameters responsible for shoreline changes in a warming Arctic climate Methods Identification of parameters influencing coastal changes Dias 31
32 Results strengths stresses Dias 32
33 Results strengths Topographic profiles Cliff height and orientation Active layer depth Ice content Grain size Organic content stresses Bathymetry Wave characteristics Water levels incl. tide Sea ice Dias 33
34 Results Strength of the coast Meters Dias 34
35 Results Strength of the coast, active layer depth Dias 35
36 Take home message Sedimentary coasts in Greenlands response to climate changes erosion, aggredation, or reworking? Dias 36
37 Take home message Sedimentary coasts in Greenlands response to climate changes eroding, accreting, or reworking Dias 37
38 Questions, inputs, and comments are very welcome! Dias 38
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