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Dynamic Response of Surface Layer Turbulence due to Solar Radiation Change

太阳辐射变化引起的表层湍流的动态响应

基本信息

批准号：
02640317
负责人：
TSUKAMOTO Osamu
金额：
$ 1.02万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640317/
关键词：
Solar Radiation Surface Boundary Layer Atmospheric Turbulence Turbulent Flux

项目摘要

Atmospheric turbulence measurements were carried out with solar radiation measurement at various surface conditions. The observation system consists of 3-dimensional sonic anemometer, thermocouple psychrometer, infrared hygrometer/carbon dioxide meter and temperature profile system.1. According to the measurements at various surface condition, such as sea surface, paddy field farm land and bare soil, it is found that influence of solar radiation change is most sensitive to heat capacity of the surface. The surface boundary layer over sea surface is less sensitive to solar radiation change.2. Based on the measurements over paddy field, turbulent flux of sensible heat is mostly influenced by radiation change and water vapor flux and carbon dioxide flux are less sensitive. We should take into account of plant physiology when surface vegitation are observed.3. Temperature fluctuations were observed at 8 logarithmic levels up to 1.28m from the bare soil surface. It is found that surface temperature responds to solar radiation change with time constant of 2-2.5 minutes. Air temperature follows to surface temperature change. The air temperature at higher levels responds with a small delay than the lower level. The peak of air temperature is not always consistent to surface temperature but it reaches to a peak before the surface temperature maximum.4. The mechanism of surface boundary layer response is found as follows. Surface. temperature changes due to solar radiation change. and increase the temperature turbulence. As a result, sensible heat flux increases and finally it turns to higher air temperature.

在各种地面条件下进行了大气湍流测量和太阳辐射测量。观测系统由三维声波风速仪、热电偶干湿球温度计、红外线湿度/二氧化碳测量仪和温度廓线系统组成.通过对海面、水田、农田、裸地等不同地表条件下的观测，发现太阳辐射变化对地表热容的影响最为敏感。海面边界层对太阳辐射变化的敏感性较低.根据对稻田的观测，湍流感热通量主要受辐射变化的影响，水汽通量和CO2通量对辐射变化的敏感性较小。地表植被恢复时应考虑植物生理.温度波动在8个对数水平上观察到从裸露的土壤表面到1.28米。结果表明，地表温度对太阳辐射变化的响应时间常数为2-2.5分钟。气温随地表温度变化而变化。在较高水平的空气温度的响应比低水平的延迟小。气温峰值与地表温度并不总是一致的，但在地表温度最大值之前有一个峰值.表面边界层响应的机理如下。面温度的变化是由于太阳辐射的变化。并增加温度湍流。感热通量增加，最终导致气温升高。