Shallow geophysical surveys of submarine
permafrost beneath the arctic coastal shoreface
P. P. Overduin, AWI Potsdam
M. N. Grigoriev, Melnikov Permafrost
Institute Yakutsk
IPA Permafrost Extent
IPA Permafrost Extent East Siberian Shelf
Brown et al. (1997)
IPA extent
Modelled Extent from Romanovskii
Hubberten & Romanovskii (2003)
ice-bonded
some ice
Zhigarev (1997)
relict ice-bonded permafrost ice-free cryotic sediment
Modelled Extent
from Zhigarev
Grosse, Romanovsky, Jorgenson, Walter Anthony, Brown, Overduin (2011)
Cross-section concept of the shelf
Research questions:
Submarine permafrost
…distribution:
- depth of the top of submarine permafrost?
- how thick is submarine permafrost?
…degradation:
- sedimentation history - coastal erosion
- bottom water
temperature & salinity - geomorphology at land
surface
Geoelectric sounding
Sediment coring
a) Location of Muostakh Island, Russia b) Instrument and deployment
sea water
buoy
anchor instrument
housing instrument
housing
anchor buoy
metal grid sea bed
metal grid
"
/Tiksi
150°E 140°E
130°E 120°E
110°E
75°N 75°N70°N
70°N
Laptev Sea Taimyr
Lena Delta
Yana-Indigirkalowland Dmitriy Laptev Strait Ana
bar-O lenyok
lowland Olenyok
Bay
Buor Khaya
Gulf
Om oloy Ole
nyo k
0 45 90 180
Kilometers
Yana
East Siberian
Sea
Sakha (Yakutia) - Russian Federation Lena
A R C T I C O C E A N
New Siberian Islands
Ambient noise
Coastal erosion & submarine permafrost
Coastal erosion & submarine permafrost
a) Location of Muostakh Island, Russia b) Instrument and deployment
sea water
buoy
anchor instrument
housing instrument
housing
anchor buoy
metal grid sea bed
metal grid
"
/Tiksi
150°E 140°E
130°E 120°E
110°E
75°N 75°N70°N
70°N
Laptev Sea Taimyr
Lena Delta
Yana-Indigirkalowland Dmitriy Laptev Strait Ana
bar-O lenyok
lowland Olenyok
Bay
Buor Khaya
Gulf
Om oloy Ole
nyok
0 45 90 180 Kilometers Yana
East Siberian
Sea
Sakha (Yakutia) - Russian Federation Lena
A R C T I C O C E A N
New Siberian Islands
Ambient noise
Permafrost table depth below sea floor [m bsf]
