Dresden 2011 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 4: Climate; jointly with Arbeitsgruppe Junge DPG (AGjDPG)

UP 4.6: Hauptvortrag

Mittwoch, 16. März 2011, 16:15–16:30, HSZ 201

Ocean, ice and climate in high latitudes: Example Laptev Sea — •Florian Greil — Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Interactions between land surfaces, ocean, ice and atmosphere determine the Earth’s climate. The variability of the planet’s radiation balance is largely determined by the snow and ice-coverage in the high latitudes.

Since the beginning of remotely sensed sea ice observations in 1979, the sea ice extent of the Northern hemisphere retreats on average with 4.7±1.1% per decade. The sea areas over the Arctic continental shelves harbour key oceanic and atmospheric processes and are therefore monitored by long-term observations.

The Laptev Sea is a key region for sea ice formation, advection and export. During winter, wind-ice dynamics repeatedly produce open water areas (polynyas) with extensive heat fluxes, sea ice formation and water mass modification. In summer, the oceanic processes are strongly influenced by the enormous freshwater discharge of Siberian rivers.

The talk will include an introduction to observational oceanography, illustrated by the experiences of a four week expedition on the hydrographic survey vessel Nikolai Jevgenov, but also preliminary results.