GEOL 106 Lecture Notes - Lecture 49: Little Ice Age, Longwave, General Circulation Model

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26 May 2018

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o slightly lower during Little Ice Age from about AD 1400 – 1800

- effect of solar radiation on recent climate change (during instrumental record) can account for small

percentage of observed changes in climate

o but the variability of solar energy is not sufficient to explain the warming since about 1960

CARBON DIOXIDE

- concentration of global carbon dioxide in atmosphere is most important proxy for global

temperature change

- carbon dioxide measurements form instrumental record → have been extended back through

measurements from trapped air in glacial ice

- positive correlation between CO2 in atmosphere collected from ice cores to paleo-temperature

record

▪ initially by glacial ice bubble

measurements

GLOBAL CLIMATE MODELS

- mathematical models to represent real world phenomena → describe numerically the linkages and

interactions between natural processes

o to predict flow of surface water and groundwater

o to predict erosion and deposition of stream sediment

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