ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Characteristics and mechanism analysis of dust weather in Beijing, Tianjin and Hebei for 6 days
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Abstract:
From April 9th to 15th, 2023 (Beijing Time, the same below), a six-day sandstorm weather event occurred in Beijing-Tianjin-Hebei, causing an irradiance loss rate of 10-12.5%, which had a certain impact on photovoltaic power generation. Utilizing conventional meteorological data, reanalysis data, and new detection methods such as wind profiler radar and lidar, this study analyzed the characteristics and maintenance mechanisms of the sandstorm weather in Beijing-Tianjin-Hebei, as well as its impact on the irradiance loss rate. The results show that the six-day sandstorm weather in Beijing-Tianjin-Hebei was directly related to three rapidly moving weather systems, primarily influenced by the Mongolian cyclone, two cold fronts, and southerly airflow. During the Mongolian cyclone phase, sand originated from southern Mongolia and was lifted and transported along the 700hPa jet stream axis, forming near-surface blowing sand or floating dust through dry deposition. In the cold front phase, extensive dust sources and the passage of a surface cold front caused a rapid increase in surface wind speed, lifting large amounts of dust which then traveled to Beijing-Tianjin-Hebei along the low-level jet in the troposphere and was rapidly transported to the surface with the descending airflow behind the cold front. During the southerly airflow phase, influenced by the return of dust sources from the middle and lower reaches of the Yangtze River, dust was continuously transported northward under the action of the southerly airflow behind the surface high pressure system, reaching relatively low altitudes and mainly forming blowing sand or floating dust through dry deposition at the surface. Sandstorm characteristics varied under the influence of different systems: During the Mongolian cyclone phase, the sandstorm had a weaker impact but a higher upper boundary height; during the cold front phase, dust concentrations were high and visibility low, with a sandstorm occurring two hours after the cold front"s passage and lasting for two hours, followed by clean air 13 hours later; during the southerly airflow phase, the sandstorm lasted longer but was the weakest in intensity. Calculations revealed that during this sandstorm event, the irradiance loss rate had a greater correlation with the cumulative dust content than with the instantaneous dust content. The local turbulence dissipation rate increased three hours earlier than the dust concentration, providing valuable indications for sandstorm monitoring and forecasting. The above analysis results offer valuable reference for future forecasting of sandstorm weather and its impact on photovoltaic power generation.
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