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SUMMARY:Arctic and Antarctic aerosol size distributions - Manuel Dall'Osto
  (ICM-CSIC\, Barcelona)
DTSTART:20180202T110000Z
DTEND:20180202T120000Z
UID:TALK99814@talks.cam.ac.uk
CONTACT:Dr Gillian Young
DESCRIPTION:Climate warming affects the development and distribution of se
 a ice\, but at present the evidence of polar ecosystem feedbacks on climat
 e through changes in the atmosphere is sparse. In this presentation\, I wi
 ll show main results carried out at the ICM-CSIC Barcelona (Spain) with in
 terdisciplinary collaborations from UK\, USA\, Ireland\, Spain\, Sweden an
 d Korea. Both polar regions are considered. \n\n(1) Atmospheric new partic
 le formation and growth significantly influences climate by supplying new 
 seeds for cloud condensation and brightness. Currently\, there is a lack o
 f understanding of whether and how marine biota emissions affect aerosol-c
 loud-climate interactions in the Arctic. Here\, the aerosol population was
  categorised via cluster analysis of aerosol size distributions taken at M
 t Zeppelin (Svalbard) during a 11 year record (2000-2010) and at Station N
 ord (Greenland) during a 7 year period (2010-2016). The occurrence of such
  events across a full decade was anti-correlated with sea ice extent.\n\n(
 2) By means of synergistic atmospheric and oceanic measurements in the Sou
 thern Ocean near Antarctica\, we present evidence that the microbiota of s
 ea ice and sea ice-influenced ocean are a previously unknown significant s
 ource of atmospheric organic nitrogen\, including low molecular weight alk
 yl-amines. Given the keystone role of nitrogen compounds in aerosol format
 ion\, growth and neutralization\, our findings call for greater diversity 
 in modelling efforts linking the marine ecosystem to aerosol-mediated clim
 ate effects in the Southern Ocean.\n\n(3) The analysis of one year (2015) 
 of continuous aerosol size distributions collected at the Halley Station (
 BAS) is presented. Briefly\, eight aerosol categories were found.  Two cat
 egories were associated to nucleation modes\, four to Aitken modes\, and t
 he remaining two to accumulation ones. A number of novel aspect will be pr
 esented\, including new particle formation associated to open pack sea ice
  surfaces\, and possibly to frost flowers. 
LOCATION:British Antarctic Survey\, Room 187
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