这是因为什么原因？
上海空港为此取消航班二百七十五架次。[{'character': '上', 'pinyin': 'shang4', 'highest pitch': 11.65, 'lowest pitch': 9.59, 'duration': 0.28, 'prosody hierarchy': 'null'}, {'character': '海', 'pinyin': 'hai3', 'highest pitch': 9.59, 'lowest pitch': 5.72, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '空', 'pinyin': 'kong1', 'highest pitch': 10.77, 'lowest pitch': 5.74, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '港', 'pinyin': 'gang3', 'highest pitch': 6.93, 'lowest pitch': 5.49, 'duration': 0.31, 'prosody hierarchy': '#2'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.05}, {'character': '为', 'pinyin': 'uei4', 'highest pitch': 8.65, 'lowest pitch': 6.87, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '此', 'pinyin': 'cii2', 'highest pitch': 8.18, 'lowest pitch': 6.87, 'duration': 0.18, 'prosody hierarchy': '#1'}, {'character': '取', 'pinyin': 'qv3', 'highest pitch': 8.09, 'lowest pitch': 5.5, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '消', 'pinyin': 'xiao1', 'highest pitch': 8.8, 'lowest pitch': 5.62, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '航', 'pinyin': 'hang2', 'highest pitch': 8.8, 'lowest pitch': 6.14, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '班', 'pinyin': 'ban1', 'highest pitch': 9.34, 'lowest pitch': 8.64, 'duration': 0.24, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.11}, {'character': '二', 'pinyin': 'er4', 'highest pitch': 10.06, 'lowest pitch': 8.64, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '百', 'pinyin': 'bai3', 'highest pitch': 5.46, 'lowest pitch': 5.29, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '七', 'pinyin': 'qi1', 'highest pitch': 10.06, 'lowest pitch': 9.86, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '十', 'pinyin': 'shiii2', 'highest pitch': 10.46, 'lowest pitch': 9.1, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '五', 'pinyin': 'u3', 'highest pitch': 9.1, 'lowest pitch': 5.01, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '架', 'pinyin': 'jia4', 'highest pitch': 9.8, 'lowest pitch': 5.01, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '次', 'pinyin': 'cii4', 'highest pitch': 7.74, 'lowest pitch': 5.6, 'duration': 0.29, 'prosody hierarchy': '#4'}]