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SUMMARY:Aerosols and global biogeochemical cycles - tiny particles links t
 he atmosphere with the ocean - Dr Zongbo Shi (University of Birmingham)
DTSTART:20130114T141500Z
DTEND:20130114T153000Z
UID:TALK41906@talks.cam.ac.uk
CONTACT:Dr Amanda Maycock
DESCRIPTION:Aerosols and gaseous pollutants are transported in the atmosph
 ere on a global scale. They are eventually removed by atmospheric dry and 
 wet deposition\, which provide nutrients (such as Fe and P) and/or toxins 
 (such as Cu) to the land and marine ecosystems. This external flux of nutr
 ients and/or toxins can affect the carbon cycle and the climate indirectly
  through affecting biogeochemical cycles in the most remote land and marin
 e ecosystems\, some of which are nutrient limited or sensitive to external
  inputs. Preliminary modeling studies show that the feedbacks in the carbo
 n cycle resulted from land-atmosphere-ocean natural and anthropogenic inte
 ractions remain as a large fraction of the uncertainty in predicting clima
 te change.  \n\nA number of parameters and processes need to be understood
  before we are able to quantify the indirect effect of atmospheric deposit
 ion on the climate. One of the key parameters is the flux of bioavailable 
 nutrients to the ocean. Although global models agree relatively well (with
 in a few times) on the flux of total dust to the oceans\, it is not well c
 onstrained by measurements. More importantly\, models are unable to agree 
 on the orders of magnitude of the flux of bioavailable nutrients. This lat
 er parameter is dependent on the total content and the solubility of the n
 utrients in atmospheric depositions. I will talk on what we know on the fa
 ctors controlling the solubility of nutrients in aerosol. I will further d
 iscuss what we are doing as well as what we need to do to improve the esti
 mation of the bioavailable nutrients to the ocean.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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