2025年1月美国洛杉矶破纪录山火事件的干旱气象条件归因

于晓晶, 张丽霞, 于志翔, 杨可儿

Attribution of drought-related meteorological conditions for the record-breaking wildfire event in Los Angeles in January 2025

YU Xiaojing, ZHANG Lixia, YU Zhixiang, YANG Ke’er

图1 美国西部地区地形（a，单位：m）、国际地圈生物圈计划（International Geosphere Biosphere Programme，IGBP）下垫面覆盖类型（b）空间分布 （三角符号表示洛杉矶位置，下同；b图中数字表示IGBP植被覆盖类型依次为：0 水，1 常绿针叶林，2 常绿阔叶林，3 落叶针叶林，4 落叶阔叶林，5 混交林，6 郁闭灌丛，7 开放灌丛，8 多树草原，9 稀树草原，10 草原，11 永久湿地，12 作物，13 城市和建成区，14 作物和自然植被的镶嵌体，15 雪、冰，16 裸地或低植被覆盖地，17 未分类区）

Fig.1 Spatial distribution of the topography of the western America (a, Unit: m) and IGBP land cover type (b) (The triangles denote the location of Los Angeles, the same as below ; The numbers for IGBP vegetation types in fig. b are as follows: 0 denotes water, 1 evergreen needleleaf forest, 2 evergreen broadleaf forest, 3 deciduous needleleaf forest, 4 deciduous broadleaf forest, 5 mixed forest, 6 closed shrubland, 7 open shrublands, 8 woody savannas, 9 savannas, 10 grasslands, 11 permanent wetlands, 12 croplands, 13 urban and built_up, 14 cropland natural vegetation mosaic, 15 snow and ice, 16 barren or sparsely vegetated, and 17 unclassified)