Abstract
A low backscattering intensity layer with clear boundary was found with an eye-safe, compact Micro Pulse Lidar (MPL) system in Qingdao (120.33, 36.07). This layer was also found from the energy monitor channel signal of the High Resolution Spectral Lidar (HRSL) system. From radiosonde data we found this layer had low relative humidity (RH) and the RH kept as a constant. Also the radiosonde data showed there was an obvious temperature inversion in low atmosphere which blocked aerosol transport. Jinan(117.55, 36.70) in Shandong province, China and west coast of Korea were two low RH centers. Similar phenomena were also found in many other days, especially in autumn. But the reasons caused to the low RH area need further research.
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