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Julia Oelker

Institution:University of Bremen
Room:NW I, room U 3220
Phone:+49 421 218 - 62178
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Other webpage(s):Web page of Julia's project
Julia Oelker

PhD project:

Phytoplankton diversity in the Southern Ocean derived by merging hyperspectral satellite information

Phytoplankton are free-floating micro algae in the world's oceans that account for about half of the global primary production. With respect to their function in the biogeochemical cycle, different Phytoplankton can be grouped into so-called phytoplankton functional types (PFT). To improve our understanding of phytoplankton's role in the global marine ecosystem and biogeochemical cycles, long-term PFT datasets with good spatial coverage are needed. Ocean color remote sensing offers the opportunity to establish such datasets. I am using the PhytoDOAS method which is based on Differential Optical Absorption Spectroscopy (DOAS) to retrieve PFTs from satellite sensors actually designed for the retrieval of atmospheric trace gases. To distinguish between different PFTs, this method exploits the spectral signatures of specific absorption spectra of different PFTs imprinted in the radiances measured by the satellite sensor.

My PhD especially focuses on retrieving PFTs in the Southern Ocean as one of the major carbon sinks for the total amount of anthropogenic carbon entering the ocean. This work is part of a DFG project within the DFG priority program “antarctic research”. Within this framework, the retrieved satellite data will be compared to PFT data modeled by a version of the Darwin ocean biogeochemical model coupled to the MITgcm general circulation model.

Thesis committee:

Prof. Dr. Astrid BracherAlfred Wegener Institute, Helmholtz Center for Polar and Marine Research (AWI), Bremerhaven
Prof. Dr. John BurrowsUniversity of Bremen
Dr. Andreas RichterUniversity of Bremen
Dr. Svetlana LozaAlfred Wegener Institute, Helmholtz Center for Polar and Marine Research (AWI), Bremerhaven