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SUMMARY:Bird Island Biosphere-Atmosphere interactions: 2010 studies and fu
 ture work - Dr. Christine Braban\, Centre for Ecology and Hydrology\, Edin
 burgh\, U.K.
DTSTART:20131113T100000Z
DTEND:20131113T110000Z
UID:TALK48794@talks.cam.ac.uk
CONTACT:Dr. Ailsa Benton
DESCRIPTION:In 2010 two CEH scientists went to Bird Island via the Collabo
 rtive Gearing system to study biosphere-atmosphere interactions. The first
  scientist\, Sim Tang from CEH involved monitoring of ammonia concentratio
 ns in order to better constrain the global seabird ammonia emission estima
 tes. As with agricultural systems\, the cycling of nitrogen from animal co
 lonies into the atmosphere and subsequent terrestrial deposition are key b
 iosphere-atmosphere interactions. GHG and ecosystem measurements were unde
 rtaken to provide an assessment of the impact of ammonia emissions on the 
 island ecosystem and emission of green house gases. Additionally SO2\, HCl
 \, HNO3 and inorganic aerosol composition\, rain composition\, ozone and C
 O2 concentrations measurements were made. The final part of study is to ex
 trapolate from the measurements to assess the Bird Island nitrogen budget.
 \n\nThe second scientist Julia Schmale (visiting from MPI\, Mainz) studied
  the biogenic influences on the composition and characteristics of aerosol
  on Bird Island with an aerosol mass spectrometer. This remote marine envi
 ronment is characterised by large seabird and seal colonies. The chemical 
 composition of the submicron particleswas 21% non-sea-salt sulfate\, 2% ni
 trate\, 8% ammonium\, 22% organics and 47% sea salt including sea salt sul
 fate. A new method to isolate the sea spray signature from the high-resolu
 tion AMS data was applied. Generally\, the aerosol was found to be less ac
 idic than in other marine environments due to the high availability of amm
 onia\, from local fauna emissions. By positive matrix factorisation five d
 ifferent organic aerosol (OA) profiles could be isolated – the origins o
 f these factors will be discussed in relation to avian activity\, longe ra
 nge transport and phytoplankton blooms int eh South Atlantic. \n\nThe stud
 ies will be discussed in terms of future research directions. Global\, reg
 ional and local climate changes can strongly influence the process of nitr
 ogen transport from the ocean to the atmosphere and back onto the land. Th
 ere is much to be done to fully understand how larger scale changes may in
 fluence both air chemistry\, GHG emissions\, and life in general in remote
  ecosystems. Future collaboration to work in this area will be discussed.\
 n
LOCATION:room 187\,  British Antarctic Survey\, High Cross\, Cambridge\, C
 B3 0ET
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