Tag Archives: atmosphere

Forest Parasols and a Thirsty Atmosphere

Have you ever sat down to a cold drink on a hot day and sucked down most of the glass in the first sip? Increasing thirst with increasing temperature also applies to Earth’s atmosphere – as air warms, it can ‘hold’ more water. The difference between the air’s level of moisture and its moisture capacity is dubbed the ‘vapour pressure deficit’ or ‘VPD’, which is essentially a measure of the thirst of the atmosphere.

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