Observations from around the world have shown that on average, pan evaporation, a measure of the evaporatiove demand of the atmopshere has decline over the last 50 years.

We want to know why and from that, deduce the implications for plant water use and for water availability.

As part of that research we constrcuted the fully instrumented pan at Canberra airport. With that pan we are examining the hour-by-hour energy balance of this unique, fully-instrumented evaporation pan.