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yexuqing木蟲之王 (文學(xué)泰斗)
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Wind shear enhances soil moisture influence on rapid thunderstorm growth
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風(fēng)切變增強了土壤濕度對快速雷暴發(fā)展的影響 ▲ 作者：Christopher M. Taylor, Cornelia Klein, Emma J. Barton, Sebastian Hahn & Wolfgang Wagner ▲鏈接： https://www.nature.com/articles/s41586-025-10045-7 ▲摘要： 對流風(fēng)暴發(fā)展迅速，通過強降水、強風(fēng)和閃電給當(dāng)?shù)鼐用駧砦：ΑｎA(yù)報系統(tǒng)通常能較好地捕獲雷暴形成的大尺度環(huán)境場，但預(yù)測單個風(fēng)暴的起始位置仍是一項基本挑戰(zhàn)。已知由土壤濕度（SM）模式驅(qū)動的非均勻加熱會形成有利于在較干燥土壤上空引發(fā)對流的大氣環(huán)流，而中低層之間的風(fēng)切變會增強風(fēng)暴的發(fā)展。 研究組表明，SM差異與風(fēng)切變的協(xié)同作用尤其有利于極端風(fēng)暴的激發(fā)。通過對撒哈拉以南非洲地區(qū)220萬次午后事件的分析，研究組發(fā)現(xiàn)，在土壤條件有利（相對于不利）的情況下，被歸類為極端的起始事件數(shù)多出68%，在SM驅(qū)動的氣流循環(huán)與風(fēng)切變誘導(dǎo)的云層移動方向相反的地方，風(fēng)暴垂直發(fā)展最為強烈。 發(fā)展的云層順著中層風(fēng)向移動，當(dāng)與低層氣流方向相反時，降雨量與局地較干燥的土壤呈現(xiàn)強相關(guān)性。盡管這種切變條件在熱帶北非地區(qū)尤為常見，但其影響在全球范圍內(nèi)有利于SM-降水負反饋。SM異質(zhì)性與風(fēng)切變相結(jié)合，為預(yù)測深對流在何處發(fā)展提供了潛在重要預(yù)報依據(jù)，尤其是對于發(fā)展最為迅猛的雷暴而言。 ▲ Abstract： Convective storms can develop rapidly, creating hazards to local populations through intense precipitation, strong winds and lightning. The large-scale environment in which thunderstorms develop is often well captured in forecast systems, yet predicting where individual storms will initiate remains a fundamental challenge. It is known that differential heating driven by soil moisture (SM) patterns creates atmospheric circulations that favour convective initiation over drier soils, whereas wind shear between low and mid levels can enhance storm growth. Here we show that the most extreme initiations are especially favoured over SM contrasts by means of an interaction with wind shear. Analysing 2.2?million afternoon events across sub-Saharan Africa, we find 68% more initiations classed as extreme given favourable (versus unfavourable) soil conditions, with greatest vertical storm growth occurring where SM-driven circulations oppose the direction of shear-induced cloud displacement. Developing clouds follow the mid-level wind direction and, where this opposes the low-level flow, rainfall is strongly correlated with locally drier soils. Although such shear conditions are particularly common over tropical north Africa, the effect favours negative SM–precipitation feedbacks globally. The combination of SM heterogeneity and wind shear provides a potentially important source of predictability for where deep convection develops, particularly for the most rapidly developing thunderstorms. |
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