ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Numerical Experiment of a Coastal Sea Fog Process over Zhejiang Coast Using a Three-Parameter Microphysical Scheme
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Abstract:
Based on visibility observation, millimeter wave radar, EC reanalysis data, and wrfv4.2 version, IAP-LACS (3M), Morrison05 (2M) and Thompson 08 (2M) tests were designed for a high concentration, wide range and high impact sea fog process in April 2021. SW99 algorithm and FSL algorithm were used to diagnose and analyze visibility, and the following main conclusions were obtained: from April 1 to 2, 2021, 850hPa Zhejiang was between southwest wind and easterly shear. The southwest wind in the South was conducive to water vapor transport and the development of temperature ridge. There was an inversion layer near the surface along the coast. The junction is stable and the water vapor condition is good. In this process, the FSL algorithm diagnosis visibility results are obviously strong, and there is no gradient. SW99 algorithm is close to the actual situation in terms of intensity and range. The IAP-LACS (3M) of SW99 algorithm performs best in strength and range compared with the other two schemes. IAP-LACS (3M) better simulated the high value area of low-level cloud water content in Zhoushan and Taizhou Wenzhou coast, and better simulated the sea fog enhancement process along the coast of Sanshan gate from 22:00 on the 1st to 00:00 on the 2nd. The improvement of this scheme on the simulation of low-level cloud water content in the sea fog process is an important reason to improve the prediction effect of the sea fog. The comparative analysis of the three groups of schemes on the element simulation of Yuhuan station shows that the temperature simulation of 2m in the three groups of schemes from 12:00 to 16:00 on the 1st day is high, but the dew point temperature is close to the actual situation, so the relative humidity in the corresponding time is relatively small, which may be one of the reasons for the missing report of sea fog in Taizhou Wenzhou coastal area at the corresponding time. The IAP-LACS (3M) has the best temperature and dew point temperature simulation effect after 20:00 on the 1st day. In this process, IAP-LACS (3M) has a good matching relationship between the distribution of the high value area of numerical concentration output and the distribution of low visibility. At present, most cloud micro schemes do not output numerical concentration, and the droplet number concentration is an important parameter affecting visibility. IAP-LACS (3M) provides conditions for the introduction of numerical concentration into visibility diagnosis scheme.
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