Observation Integration: Auxiliary data to support lake influence in SAT analysis

Relationship building activities on linking lake surface water and surface air temperature have clarified (1) that some fraction of co-variability can likely be modelled historically prior to available LSWT data within the analysis, and (2) that there is a region of influence of lake on SAT that we wish to take basic account of that goes beyond the lake area (not just “over lakes” in the case of large lakes), and that this region cannot be defined only from available data. Therefore an additional simulation-driven deliverable of information quantifying the region of influence of LSWT on SAT and how it relates to LSWT/SAT anomalies is proposed. Task T1.4b (addition to T1.4) (Met Office) Undertake simulations of daily-resolved SAT using the PRECIS regional climate model for Lake Victoria, using prescribed LSWT from UoR, at 25km resolution which is sufficient to inform the 0.25 degree analysis of SAT daily minimum and maximum. (UoR) Undertake simulations of daily-resolved SAT using openIFS for Lake Victoria and >12 relevant very large lakes, using prescribed LSWT, at a resolution sufficient to inform the 0.25 degree analysis of SAT daily minimum and maximum. (UoR) Formulate outputs of the above into the spatial patterns and temporal coefficients described in D1.5 as useful to represent lake effects in the EUSTACE analysis.