Horizontal Variations of Nocturnal Temperature and Turbulence Over Microtopography
Horizontal Variations of Nocturnal Temperature and Turbulence Over Microtopography
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微地形夜间温度和湍流的水平变化
DOI：
10.1007/s10546-022-00721-w
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发表时间：
2022
影响因子：
4.3
通讯作者：
Mahrt, L.
中科院分区：
文献类型：
--
作者：
Mahrt, L.
Nocturnal spatial variation of temperature, wind, and turbulence over microtopography is generally poorly understood. Low amplitude microtopography covers much of the Earth’s surface and, with very stable conditions, can produce significant spatial variations of temperature and turbulence. We examine such variations over gentle terrain that include two shallow gullies that feed into a small valley. The gullies are covered by a sub-network of seven flux stations that is embedded within a larger network that covers the valley. The measurements indicate that gullies of only 2–5-m depth and 100-m width can often lead to spatial variations of temperature of several kelvin or more. Such variations depend on ambient wind speed and direction and the near-surface stratification. We investigate the surprising importance of microscale lee turbulence occurring over the gentle microtopography with slopes of only 5%. Near-surface stratification unexpectedly tends to increase with surface elevation on the slopes. We examine the potential causes of this puzzling behaviour of the near-surface stratification.
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DOI：
--
发表时间：
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期刊：
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