Cloud particle detection method and cloud particle detector

Abstract

The present invention discloses a cloud particle detection method and a cloud particle detector. According to the cloud particle detection method, the backscattering signals of the cloud particles are received to detect the depolarization condition of the cloud particles on laser so as to obtain the phase state of the cloud particles; and the forward scattering signals of the cloud particles are received to detect the equivalent optical particle size of the cloud particles. According to the present invention, with the cloud particle detection method and the cloud particle detector, the small ice crystal (less than 50 [mu]m) in the mixing phase state cloud can be effectively detected.

Description

technical field [0001] The invention relates to a cloud particle detection method and a detector capable of distinguishing cloud particle phase states. Background technique [0002] The size spectrum information of small ice crystals in clouds plays an important role in the scientific research of cloud radiology and cloud physics. Clouds cover about 60%-70% of the Earth's surface, and the global average net radiative forcing from clouds is about four times greater than the possible greenhouse effect caused by increased carbon dioxide. Among many types of clouds, cold clouds have a particularly important impact on the Earth's radiation budget. The IPCC Fourth Assessment Report pointed out that there are still great uncertainties in the role of clouds in radiative forcing and climate change, and one of the most important sources of uncertainty is caused by cold cloud radiation. The radiation characteristics of cold clouds are not only determined by the ice water content, but...

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Problems solved by technology

Cotton reported in 2010 that the second-generation ice crystal detector SID-2 uses custom-made phase function detectors (32 detectors) distributed in concentric circles. The sensitivity of the detector has also been greatly improved, but when the cloud particle concentration exceeds 20 / cm 3 When , SID-2 cannot distinguish individual particles

The third-generation SID-3 uses a high-resolution camera to perform two-dimensional imaging of the stripes to obtain high angular resolution. However, due to the slow processing speed of the camera, when the concentration of ice crystal particles is large, particle mergers occur, and the measured particle number is less than Actual number of particles

Therefore, the detection of small ice crystals (less than 50 μm) in ice clouds or mixed-phase clouds is still an unsolved problem

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