| Tropospheric sulphate aerosols (TSA) may oxidise the photosynthesising tissues
if they are taken up by plants. AÂparametrisation of this impact of tropospheric
sulphate aerosols (TSA) on the terrestrial gross primary production is suggested. This
parametrisation is implemented into the global Earth system model developed at the
A.M.ÂObukhov Institute of the Atmospheric Physics, Russian Academy of Sciences
(IAP RAS CM). With this coupled model, the simulations are performed which are
forced by common anthropogenic and natural climate forcings based on historical
reconstructions followed by the RCPÂ8.5 scenario. The model response to sulphate
aerosol loading is subdivided into the climatic (related to the influence of TSA
on the radiative transport in the atmosphere) and ecological (related to the toxic
influence of sulphate aerosol on terrestrial plants) impacts. We found that the former
basically dominates over the latter on the global scale and modifies the responses
of the global vegetation and soil carbon stocks to external forcings by 10%. At
regional scale, however, ecological impact may be as much important as the climatic
one. |