送交者: Amsel 于 2009-12-21, 18:59:16:
回答: 共同学习。下面这句话真的不懂(屡次见AGWer这么讲) 由 Amsel 于 2009-12-21, 18:46:09:
Christy says the shift in natural dry, brown scrub to irrigated green fields in the San Joaquin Valley and other large farming regions means less heat is absorbed, and it provides a cooling effect on daytime temperatures. In contrast, the additional moisture in the ground holds in heat that is released at night, leading to the warmer nighttime readings. This is not a heat island effect, Christy proposes, nor is it fully related to heat radiating back into space and being trapped by CO2. “In some areas, the observed warming is more consistent with land-use change than our understanding of greenhouse gas effects,” he believes.