3. Wochenbericht ANT-XXIII/10

Polarstern XXIII/10 Am 12. April 2007 hatte das Forschungschiff Polarstern unter der Fahrtleitung von Prof. Dr. Andreas Macke den Atlantiktransfer von Kapstadt nach Bremerhaven angetreten

Monte Carlo Radiative Transfer Simulations on the Influence of Surface Waves on Underwater Light Fields

A Monte Carlo model has been developed for calculating the penetration of light into the ocean. For monochromatic light (490 nm) the spatial exact allocation of the scattered parts of underwater light is described in terms of the variation of particle content and the angle of light incidence. Based on this model, it is possible to generate complex spatiotemporal fluctuating light fields according to every possible shape of the water surface. By means of single gravity waves the focusing effect and its importance of radiance supply for water depths up to 100 m is discussed

3. Wochenbericht ANT-XXVI/1

ANT-XXVI/1, Wochenbericht Nr. 3 3. November - 9. November 2009 [POLARSTERN

Saharan dust transport and deposition towards the tropical northern Atlantic

We present a study of Saharan dust export towards the tropical North Atlantic using the regional dust emission, transport and deposition model LM-MUSCAT. Horizontal and vertical distribution of dust optical thickness, concentration, and dry and wet deposition rates are used to describe seasonality of dust export and deposition towards the eastern Atlantic for three typical months in different seasons. Deposition rates strongly depend on the vertical dust distribution, which differs with seasons. Furthermore the contribution of dust originating from the Bodélé Depression to Saharan dust over the Atlantic is investigated. A maximum contribution of Bodélé dust transported towards the Cape Verde Islands is evident in winter when the Bodélé source area is most active and dominant with regard to activation frequency and dust emission. Limitations of using satellite retrievals to estimate dust deposition are highlighted

2. Wochenbericht ANT-XXVI/1

ANT-XXVI/1, Wochenbericht Nr. 2 27. Oktober - 2. November 2009 [POLARSTERN