Euro-limpacs Deliverables

ABSTRACT - DELIVERABLE 104

Paper on the results from hydrology and seasalt experiments on runoff chemistry

There are multiple ways in which surface waters will be affected by global change. In a modelling exercise Wright et al. (2006) identified a suite of factors which will potentially be important drivers of future changes in surface water quality. These included increased sea salt deposition, increased deposition of dust, increased or decreased runoff, increased weathering rate in the soils, increased release of DOC from the soils, increased partial pressure of CO2, increased forest growth and increased decomposition of soil organic matter. Based on the modelling results the importance of a similar relative magnitude of change in these drivers is to be expected to be site specific. At Gårdsjön site the two most important drivers of change were increased sea salt deposition and increased runoff. In Euro-limpacs it was decided to study the effects of increased sea salt and increased runoff by adding sea salt and by enhancing runoff experimentally in field by means of srpinkling system installed in the Gårdsjön sub-catchment G1. Sea salt (and water) was added in 2004 and in 2005 runoff was significantly increased by sprinkling additional 'precipitation' (see Deliverables 21 and 352).

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