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

  • role： First author第一作者
  • Affiliation：

    Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, CMA Key Laboratory of Aerosol-Cloud-Precipitation, Nanjing University of Information Science & Technology, Nanjing 210044, China

    School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China

    North Sky-Dome Information Technology (Xi'an) CO., LTD, Xi'an 710100, China

  • Email：leilianfa_2006@163.com
  • Introduction：雷连发，研究方向为大气微波遥感技术与应用。E-mail：leilianfa_2006@163.com。
LEI Lianfa123,  
  • Affiliation：

    Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, CMA Key Laboratory of Aerosol-Cloud-Precipitation, Nanjing University of Information Science & Technology, Nanjing 210044, China

    School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China

WANG Zhenhui12,  
  • Affiliation：

    State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS), Wuhan University, Wuhan 430074, China

MA Yingying4,  
  • Affiliation：

    Meteorological Observation and Technology Support Center of Shaanxi Province, Xi'an 710014, China

LI Chengwei5,  
  • Affiliation：

    Key Laboratory for Cloud Physic of China Meteorological Administration, Beijing 100081, China

LIU Xiaolu6,  
  • Affiliation：

    Weather Modification Office of Guangxi Zhuang Autonomous Region, Nanning 530022, China

CAO Jiangping7,  
  • Affiliation：

    Xi'an Meteorological Observation Center, Xi'an 710016, China

BAI Shuicheng8,  
  • Affiliation：

    North Sky-Dome Information Technology (Xi'an) CO., LTD, Xi'an 710100, China

ZHU Lei3,  
  • Affiliation：

    North Sky-Dome Information Technology (Xi'an) CO., LTD, Xi'an 710100, China

LU Jianping3

реферат

Earth energy comes from solar radiation, and 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, causing cooling in the surface layers of the atmosphere. Solar eclipse provides an ideal condition for studying the response of the atmosphere. On June 21, 2020, an annular eclipse occurred in China, and the partial solar eclipse can be seen except for the annular eclipse region. This solar eclipse provides a good opportunity for us to study the variation of the atmospheric thermodynamics. The most important parameter of thermodynamics during solar eclipse is the temperature in the different altitudes in the boundary layer. In this paper, to study the effect of the solar eclipse on atmospheric thermodynamics in the boundary layer, the atmospheric temperature and humidity profiles observed by the Ground-based multichannel Microwave Radiometer (GMR) in Xi’an, Zunyi, Nanning and Yibin, China. The GMR has high spatial resolution and high sensitivity and it is usually used to observe and study the atmospheric temperature and humidity profiles. Therefore, the variation of the atmospheric thermodynamics was studied at different regions and weather conditions by using the GMR during the solar eclipse. At these observation stations, the proportion of the sun covered by the moon is different; the annular eclipse can be observed in Yibin, and the covered proportion is maximum. This paper compared the results of the experiment and the observation results showed that the temperature and humidity profiles of the boundary layer had obviously changed. From the beginning of the solar eclipse to the maximum of the solar eclipse, the temperature of the boundary layer began to decrease because the solar radiation reaching the Earth was 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, the temperature of the boundary layer began to rise, the variation in relative humidity was the opposite, the maximum variation in the temperature was approximately 4 ℃, the relative humidity was more than 10%, and the water vapor density profile had no obvious variation at these stations. The variation in the temperature and humidity lagged behind by approximately 15 to 20 minutes. The effect of the solar eclipse decreases with increasing height for the temperature and humidity in the boundary layer. In the process of the solar eclipse, the greater the solar disk is covered by the moon, the more obvious the effect of the solar eclipse on the temperature and humidity in the boundary layer. Due to the attenuation of solar radiation by clouds and rain, the influence of solar eclipses on the atmospheric temperature and humidity in the boundary layer will be weakened. This observation experiment had provided fine-scale variations of the atmospheric parameters both in time and height by using the GMR during the solar eclipse. These results may have important implications in understanding the response of atmosphere to the thermodynamics perturbations caused by the solar eclipse.

ключеви́че слова́

remote sensing;the solar eclipse;Microwave radiometer;the boundary layer;temperature profile;relative humidity profile

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