台風登陸前夜,上海的天空變成了一片紫色
文章來源: 澎湃新聞 於
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7月24日晚上六七點左右,上海雨水暫歇,天空中不僅出現了晚霞,而且晚霞呈現出的色彩是紫色。台風登陸前夜的紫色晚霞,讓不少市民網友感到驚豔,紛紛用相機或手機,記錄下這一刻的美景。
上海此時為何會出現紫色晚霞?這其實與台風“煙花”的影響有很大關係。
24日晚上,澎湃新聞記者從上海市氣象局獲悉,事實上,台風來臨前經常會出現這樣的情景,比如2018年“雲雀”台風影響日本時,也有類似晚霞。
“這主要是因為大氣中的水汽比較充沛。”上海市氣象局專家對此解釋稱,落日的餘暉經過富含水汽的大氣層後,更多地保留了黃紅等暖色,在日落後的藍色時段,天空大背景的深藍色疊加紅色,便呈現出紫色的效果。”
澎湃新聞記者還從上海市氣象局了解到,目前,台風”煙花“主體已經影響浙江北部沿海地區,隨著螺旋雨帶不斷靠近,上海的東部地區也已經出現降雨,接下來,較強降水將自東向西影響上海。此外,上海中心氣象台已於24日20時發布台風橙色預警信號,暴雨黃色預警信號仍維持。
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