部分原因似乎是热空气从楼宇密集的表面上升，造成城市大气的更大湍流。
The cause appears to be in part greater turbulence in the urban atmosphere as hot air rises from the built-up surface.
因为温暖的空气比冷空气能容纳更多的湿气，所以只有当大气中的水蒸气量随着温度的升高而增加时，相对湿度才会保持不变。
Because warm air can hold more moisture than cool air, the relative humidity will be constant only if the amount of water vapor in the atmosphere increases as the temperature rises.
通过研究这些成分，科学家们获得了气候的许多方面的详细档案，包括空气温度、降雪和大气中温室气体的浓度。
By studying these components, scientists have obtained a detailed archive of many aspects of climate, including air temperatures, snowfall, and concentrations of greenhouses gases in the atmosphere.
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