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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Processes controlling rapid temperature variations on rock surfaces
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Processes controlling rapid temperature variations on rock surfaces

机译：控制岩石表面温度快速变化的过程

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摘要

In arid environments, thermal oscillations are an important source of rock weathering. Measurements of temperature have been made on the surface of rocks in a desert environment at a sampling interval of 0 75 s, with simultaneous measurements of wind speed, air temperature, and incoming shortwave radiation. Over timescales of hours, the temperature of the rock surface was determined primarily by shortwave radiation and air temperature, while rapid temperature variations, high dT/dt, at intervals of seconds or less, were determined by wind speed. The maximum values of temperature change and time spent above 2°C min-1 increased at high measurement rates and were much higher than previously reported. The maximum recorded value of dT/dt was 137°C min-1 and the average percentage time spent above 2°C min-1 was ~70 ± 13%. Maximum values of dT/dt did not correlate with the maximum values of time spent above 2°C min-1. Simultaneous measurements of two thermocouples 5-5 cm apart on a single rock surface had similar temperature and dT/dt values, but were not correlated at sampling intervals of less than 10 s. It is suggested that this is resulting from rapid fl uctuations due to small spatial and timescale wind effects that are averaged out when data is taken at longer sampling intervals, ~10 s or greater.
机译：在干旱的环境中，热振荡是岩石风化的重要来源。在沙漠环境中的岩石表面以0 75 s的采样间隔进行了温度测量，同时测量了风速，空气温度和入射短波辐射。在几小时的时间范围内，岩石表面的温度主要由短波辐射和空气温度决定，而快速的温度变化，几秒或更短的时间间隔内的高dT / dt则由风速决定。在高测量速率下，温度变化和花费的时间在2°C min-1以上的最大值增加了，并且比以前报道的要高得多。 dT / dt的最大记录值为137°C min-1，在2°C min-1以上所花费的平均时间百分比为〜70±13％。 dT / dt的最大值与2°C min-1以上所花费的时间的最大值不相关。在一个岩石表面上相距5-5 cm的两个热电偶的同时测量具有相似的温度和dT / dt值，但在小于10 s的采样间隔内没有相关性。建议这是由于空间和时间尺度上的小风效应引起的快速波动，当以较长的采样间隔（约10 s或更长）采集数据时，风效应会平均化。

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