Events Calendar

BG/ATM Seminar | Manuel DALL´OSTO

30 November at 13h00
Lecture room U37


Polar atmosphere-ice-ocean Interactions:
Impact on Climate and Ecology



Manuel DALL´OSTO
Institute of Marine Sciences (ICM-CSIC), Barcelona, Spain

Climate warming affects the development and distribution of sea ice, but at present the evidence of polar ecosystem feedbacks on climate through changes in the atmosphere is sparse. In this presentation both Polar regions are considered. (1) By means of synergistic atmospheric and oceanic measurements in the Southern Ocean, we present evidence that the microbiota of sea ice and sea ice-influenced ocean are a previously unknown significant source of atmospheric organic nitrogen, including low molecular weight alkyl-amines. Given the keystone role of nitrogen compounds in aerosol formation, growth and neutralization, our findings call for greater diversity in modelling linking the marine ecosystem to aerosolmediated climate effects in the Southern Ocean. (2) Atmospheric new particle formation and growth significantly influences climate by supplying seeds for form clouds. Currently, there is a lack of understanding of whether and how marine biota emissions affect aerosol-cloud-climate interactions in the Arctic. Here, the aerosol population was categorised via cluster analysis of aerosol size distributions taken at Mt Zeppelin (Svalbard) and at Station Nord (Greenland). Air mass trajectory analysis and atmospheric nitrogen and sulphur tracers link aerosol nucleation events to biogenic precursors released by open water and melting sea ice regions. The occurrence of such events across a full decade was anti-correlated with sea ice extent. During the last part of the presentation I aim also to present possible collaborations on sea ice-oceanatmosphere biogeochemistry.

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