Chapter 3 ()Accumulation of heat Temperature sum Active temperature sum Da=∑t Effective temperature sum De=2(t-tb 2021/2/22 Assessment of Climate/Change Impacts of 76Chapter 3 2021/2/22 Assessment of Climate/Change Impacts 39 of 76 • Temperature sum Active temperature sum: Da=t Effective temperature sum: De=(t-tb ) (3) Accumulation of heat