How does the ambient temperature affect the rate of redox reactions in a salt lake?
The salt lakes that occur in Western Australia are touted by the article Geochemical characteristics of naturally acid and alkaline saline lakes
in southern Western Australia (Bowen and Benison, 2009) are unique environments, in that they possess


  an extreme and rare
  range of natural hydrogeochemical conditions. Many WA lake
  waters and groundwaters are hypersaline and acidic.


The article discusses observations of effects due to temperature, especially cycles of dry and wet.  The high ambient temperatures would cause increased evaporation, and hence increase local evapoconcentrations of ions, resulting in a lowering of the local pH, storm/inundation events have the opposite effect.  This leads to further observations by the authors that found that


  Field observations of lake pH during storm events
  illustrated that fluids that have been freshened due to meteoric input
  are able to regain acidity rapidly. Part of the acidity may be locally
  sustained by ongoing $\ce{Fe}$ cycling and redox reactions that
  generate $\ce{H+}$ ions. The amount of $\ce{Fe}$ increases significantly in the
  more acid waters, and authigenic $\ce{Fe} mineralization (oxides
  and sulfates, e.g., hematite and jarosite) is abundant throughout
  the acid lake sediments.