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Near-shore permafrost degradation

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Near-shore permafrost degradation

in Siberia

Paul Overduin

Michael Angelopoulos Bennet Juhls

Fabian Kneier Trond Ryberg

Christian Haberland Mikhail N. Grigoriev

(2)
(3)

Adapted from

Osterkamp (2011)

(4)
(5)
(6)

Bykovsky

(7)
(8)

489 m offshore (110 years) 703 m offshore

(150 years) 2565 m offshore

(600 years) 11233 m offshore

(2500 years)

80 60 40 20 0

-20 -15 -10 -5 0 5

Permafrost temperature Cape Mamontov Klyk

land

5000 yrs 0°C

-12°C

3600 yrs

Adapted from

Lachenbruch & Marshall (1977)

depth

(9)
(10)
(11)

resistivity [Ωm]

(12)

A´

A

(13)

A´

A

(14)
(15)

Adapted from

Osterkamp (2011)

inundation period degradation

(16)

Summary

• permafrost temperature changes rapidly following inundation

• thawing of permafrost takes longer (m to mm per year)

• frozen sediment is preserved for millenia and longer, depending on permafrost temperature and composition before inundation

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