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南京大学王淑瑜团队GRL—从25公里到9公里:气候模型"高清化"破解热浪预报难题

  • 2026-02-10 02:49:18
南京大学王淑瑜团队GRL—从25公里到9公里:气候模型"高清化"破解热浪预报难题

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论文信息

期刊:GEOPHYSICAL RESEARCH LETTERS

中科院分区和影响因子:2区TOP(4.6)

研究概述

理解极端气候事件期间复杂的热力和动力过程至关重要。本研究使用25公里和9公里分辨率的天气预报模式(分别称为WRF25和WRF9),对2013年中国中东部极端高温事件(EHE)开展了研究。结果表明,WRF9的模拟性能优于WRF25,其增值作用主要归因于非绝热加热的影响,而该影响受到陆-气反馈的调制。较干旱的土壤水分限制了蒸散并增强了感热通量,与WRF25相比,WRF9模拟出了更强的正土壤水分-大气相互作用。WRF9中较高的地表净能量和较低云量使地表温度进一步升高,并放大了地表-大气温度梯度。值得注意的是,WRF9中陆-气耦合强度比WRF25更显著。这些发现表明,模式分辨率对于捕捉EHE中的复杂过程具有重要意义。

主要图文

图1 模拟区域地形图

图2 气象站观测的2013年极端高温事件期间日最高气温(Tmax)特征及WRF9与WRF25模拟结果对比(图a-e中的Tmax采用JJA(6-8月)日均值计算,图f采用615个气象站的平均值计算。图a:观测的JJA平均Tmax;图b:WRF25模拟的JJA平均Tmax;图c:WRF9模拟的JJA平均Tmax;图d:WRF9与WRF25模拟差异;图e:观测、WRF25和WRF9模拟的Tmax概率密度分布;图f:2013年夏季区域平均Tmax的逐日演变及分段(红色:观测,棕色:WRF9,橙色:WRF25).

图3 JJA期间极端高温事件中热力学方程各项组合项(a-d)及垂直速度(e)和位温(f)(各项首先在2013年极端高温事件区域(25–35°N,105–123°E)进行空间平均,时间分辨率为3小时,然后在JJA期间进行时间平均)。图a:局地温度变化项;图b:温度平流项;图c:绝热加热项;图d:非绝热加热项;图e:垂直速度(omega);图f:位温。

图4  WRF9和WRF25模拟的2013年极端高温事件第4、5阶段区域平均(a)陆-气相互作用和云响应多要素演变及(b)陆-气耦合强度指数π与相关温度能量项演变(此处以整个JJA作为平均状态,各项在2013年极端高温事件区域(25–35°N,105–123°E)进行空间平均)。图a:感热通量(SH)、潜热通量(LH)、波文比(Bowen ratio)、土壤湿度(SM)和低云量(CLDFRA)的时间演变;图b:耦合指数π及相关温度与能量项(H*、Hp'和T)的时间演变。

研究结论

高分辨率模型具有明显优势:WRF9(9公里分辨率)对2013年中国中东部极端高温事件的模拟整体优于WRF25(25公里分辨率)。在空间分布上,WRF9的相关系数更高(R₉=0.68 vs R₂₅=0.57),均方根误差和平均绝对误差更小,在极端高温稳定维持阶段(Stage 4),WRF9的优势最为显著,相关系数达0.85,明显高于WRF25的0.80

非绝热加热是主要驱动机制:热力学方程分析表明,非绝热加热是极端高温事件升温的首要驱动因子,其贡献超过温度平流和绝热加热

WRF9模拟的非绝热加热强度在各气压层均强于WRF25,这表明高分辨率模型能更好地解析细尺度的陆-气交换过程。

更强的陆-气耦合反馈:WRF9模拟的土壤湿度更低、感热通量更高(高9.32 W/m²)、潜热通量更低(低15.05 W/m²),形成更强的正反馈。陆-气耦合指数(π)在WRF9中峰值高约5,表明高分辨率模型模拟的耦合强度更显著。土壤干燥化限制蒸散,将更多能量分配给感热加热,进一步加剧近地面升温。

云反馈机制的放大效应:WRF9模拟的低云量更少,使地表接收的短波净辐射更高(高3.66 W/m²),直接增强日间地表加热。云量减少与土壤干燥化相互强化:干燥土壤和更暖的低层大气增加大气稳定度,抑制对流,进一步减少云量。

地表能量收支差异:WRF9的地表净能量预算高于WRF25,能更有效加热地表并放大地表-大气温度梯度。通过湍流输送,这种能量梯度转化为对大气的加热效应,推高日最高气温。

论文下载

网盘链接: https://pan.baidu.com/s/19ngWja2XbTeufERBuRMQew?pwd=8sjj 提取码: 8sjj

论文引用

Wang, S., Wang, S., Zhang, M., Tang, J., Yan, X., & Fu, C. (2026). Dynamic downscaling resolution affects hot extreme processes: A case study of 2013 summer extreme hot event over central and eastern China. Geophysical Research Letters, 53, e2025GL119257. https://doi.org/10.1029/2025GL119257

Hydrometeorological frontiers

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  1. CONNECT:[ UseTime:0.000989s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001668s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000679s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000687s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001332s ]
  6. SELECT * FROM `set` [ RunTime:0.000519s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001378s ]
  8. SELECT * FROM `article` WHERE `id` = 458410 LIMIT 1 [ RunTime:0.001230s ]
  9. UPDATE `article` SET `lasttime` = 1773392501 WHERE `id` = 458410 [ RunTime:0.024621s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000817s ]
  11. SELECT * FROM `article` WHERE `id` < 458410 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001263s ]
  12. SELECT * FROM `article` WHERE `id` > 458410 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001019s ]
  13. SELECT * FROM `article` WHERE `id` < 458410 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005991s ]
  14. SELECT * FROM `article` WHERE `id` < 458410 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001915s ]
  15. SELECT * FROM `article` WHERE `id` < 458410 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002745s ]
0.232176s