灾害学2024，Vol.39Issue(2)：113-118,6.DOI:10.3969/j.issn.1000-811X.2024.02.018
2022年极端干旱背景下湖南森林火灾气象条件分析
Analysis of Meteorological Conditions of Forest Fires in Hunan under the Background of Extreme Drought in 2022
摘要
Abstract
Based on the surface meteorological observation data,drought index,numerical model analysis data of CMA_GD region,satellite cloud images and remote sensing data in Hunan Province,the meteorological characteristics of the major forest fire during Xintian"10·17"are analyzed from the aspects of atmospheric circu-lation,weather conditions,meteorological physical quantities,satellite remote sensing and cloud images.The re-sults showed that:before the occurrence of the major forest fire in Xintian"10.17",it had suffered from summer and autumn drought,extreme continuous sunny weather and high temperature and heat wave weather.This resulted in a 45-day drought and a very high forest fire risk meteorological level in Xintian;During the fire,on the 18th,the combination of daytime radiation heating,valley wind development,and the foehn effect of dry and cold air climbing intensified the thermal convection at the fire site,resulting in the rapid spread of the fire.From 09:00 to 10:00 on the 21st,there was a sudden increase in environmental wind and atmospheric stratification with dry and wet upper and lower layers,and its convective instability potential background was conducive to the occurrence of deflagration,and the local small-scale low pressure formed after deflagration also provided a positive feedback mechanism for the maintenance of deflagration.Satellite cloud images have a good monitoring effect on fire develop-ment and flame area change under clear sky conditions.关键词
森林火灾/气象因子/绝对湿度/极速蔓延Key words
forest fires/meteorological factors/absolute humidity/extremely fast spread分类
农业科技引用本文复制引用
杨云芸,唐杰,陈鹤,黄骄文,陈龙,王晓雷,王青霞,赵恩榕..2022年极端干旱背景下湖南森林火灾气象条件分析[J].灾害学,2024,39(2):113-118,6.基金项目
中国气象局复盘发展专项"2022年极端干旱背景下湖南森林火灾气象条件研究"(FPZJ2023-086) （FPZJ2023-086）
