![]() ![]() The high-resolution model produces good results that capture the atmospheric convection, rainfall features, and major dust outbreaks recorded at a ground station in Riyadh. ![]() We compare the model results with the data obtained from aircraft and meteorological radar during a field campaign conducted at that time. This type of dust storm is associated with a cold air outflow from thunderstorms and is specific to the wet spring season in this region. #Iron stationweather nc series#In this study, we use a sophisticated numerical model of atmospheric circulation with an aerosol component to simulate a series of local-scale haboob dust storms that occurred in the central Arabian Peninsula during April 2007. This suggests that the current dust parameterizations, which prescribe the size distribution of the emitted dust, underestimate the number of large particles that increases at strong wind conditions. During periods of high local dust production, the WRF-Chem model underestimated the PM 10 mass concentration (associated mostly with dust particles larger than 3 μm in diameter) by nearly a factor of 2. Approximately 40% of the locally deposited dust was subject to wet removal processes. About 25 Tg of dust was emitted in the Arabian Peninsula during the 10-day period. ![]() The model captured the major dust generation patterns, transport pathways, and several of the largest haboobs identified from the satellite observations. The convection-associated dust outbreaks were simulated well, with the aerosols optical depth magnitude and the temporal variability being in good agreement with both the ground-based and satellite aerosol retrievals. Although the amount of rainfall in the model was slightly underestimated compared to the satellite measurements, it was approximately double the rainfall in the reanalysis. However, the WRF-Chem model did successfully capture the primary features of the convection, its location, and precipitation patterns. Because of insufficient spatial resolution, the event was not resolved accurately by the conventional reanalyses. Dust generation was caused by both strong large-scale winds and locally produced density currents. Active convection persisted for several days during the study period. The field campaign provided the valuable aircraft and Doppler weather radar measurements. Strong mesoscale haboob dust storms in April 2007 in the central Arabian Peninsula were studied using the cloud-resolving Weather Research and Forecasting-Chemistry (WRF-Chem) modeling system and observations collected during an intensive atmospheric field campaign. ![]()
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