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引用本文:

DOI:

10.11834/jrs.20210465

收稿日期:

2020-10-19

修改日期:

2021-05-10

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日食对我国大气边界层热力状态的影响分析
雷连发1, 王振会1, 马盈盈2, 李成伟3, 刘晓璐4, 曹江平5, 白水成6, 朱磊7, 卢建平7
1.南京信息工程大学大气物理学院;2.武汉大学测绘遥感信息工程国家重点实验室;3.陕西省气象局气象探测中心;4.中国气象局云雾物理环境重点实验室;5.广西壮族自治区人工影响天气办公室;6.西安市大气探测中心;7.北方天穹信息技术(西安)有限公司
摘要:

地球的能量主要来源于太阳,太阳的辐射变化对地球大气边界层有着潜在的影响。日食过程中太阳被遮挡减少了到达地球的热辐射能量,大气热力状态被改变,为我们研究大气层热力状态的变化提供了一个好的机会。2020年6月21日,在我国境内出现了一次日环食,除日环食带以外我国其他地区都可见到日偏食。为了研究日食对边界层大气热力状态的影响,本文分析了西安、遵义、南宁和宜宾四个不同地区的微波辐射计实时连续观测的大气温湿度廓线数据,研究日食期间不同日面遮挡程度对不同边界层高度上大气热力状态的变化及其受天气条件的影响。结果表明,日食期间大气边界层温湿度受到日食的影响较为明显。从日食开始到最大时刻由于到达地球的太阳辐射能减少,边界层大气温度也开始降低,在日食从最大时刻到结束期间,从太阳到达地球的辐射能量逐渐增大,边界层温度开始上升。日食过程中相对湿度变化与温度相反,四个站点温度变化最大约4℃,相对湿度变化超过10%,各个高度层温湿度变化明显滞后日食过程约15~20分钟。日食过程中,月球对日面遮挡越多,日食对边界层大气温湿度廓线的影响也越明显。日食对边界层大气温湿度的影响随着高度的增加逐渐减弱,日面被遮挡的面积越少日食对边界层影响的最大高度也就越低。在有云层和降雨情况下,日食对边界层大气温湿廓线的影响将会减弱。

Effects of the solar eclipse on atmospheric boundary layer thermodynamics in China
Abstract:

The energy of the earth comes from the solar radiation, and the solar radiation has a potential impact on the atmospheric boundary layer. During the solar eclipse, the solar disk is covered by the moon and the solar radiation is reduced to reach the earth. Therefore, the atmospheric thermodynamics is changed, and it provides a good opportunity for us to study the variation of atmospheric thermodynamics. On June 21, 2020, an annular eclipse occurred in China and the partial solar eclipse can be seen except for the annular eclipse region. In this paper, in order to study the effect of the solar eclipse for the atmospheric thermodynamical in the boundary layer, the atmospheric temperature and humidity profiles observed by the ground-based multi-channel microwave radiometer were analyzed with in Xi’an, Zunyi, Nanning and Yibin, and the variation of thermodynamics was studied in different altitudes and weather conditions during the solar eclipse. The results shown that the temperature and humidity of the boundary layer had obviously change. From the beginning of the solar eclipse to the maximum of the solar eclipse, the temperature of the boundary layer began to decrease because of the solar radiation reaching the earth is reduced. During the period from the maximum solar eclipse to the end of the solar eclipse, the radiation energy from the sun to the earth gradually increased, and the temperature of the boundary layer begins to rise and the variation of relative humidity is opposite, the maximum variation of the temperature is more than 3 ℃, and the relative humidity is more than 10% in these stations. The variation of the temperature and humidity lagged behind about 15 to 20 minutes. The effect of the solar eclipse decreases with the increase of height for the temperature and humidity in the boundary layer. In the process of the solar eclipse, the more the solar disk is covered by the moon, the effect of solar eclipse is more obvious for the temperature and humidity in the boundary layer. When it"s cloudy or rainy, the influence of solar eclipse will be weakened for the atmospheric temperature and humidity in the boundary layer.

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