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南京信息工程大学Atmospheric Research-青藏高原骤旱骤湿转换的时空异质性和遥相关驱动因素

  • 2026-06-27 10:03:18
南京信息工程大学Atmospheric Research-青藏高原骤旱骤湿转换的时空异质性和遥相关驱动因素

文章来源

DOI: 10.1016/j.atmosres.2026.109168


研究简介

在全球变暖背景下,骤旱骤湿转换(Abrupt Dry–Wet Transitions, ADWTs)对青藏高原(亦称“亚洲水塔”)的水资源和生态安全构成重大风险。然而,目前仍缺乏基于水可用性(water availability)的ADWT系统化表征。本研究利用ERA5-Land再分析资料(1995–2024年),基于降水减蒸发(PME)指数和日尺度2σ阈值差分法,揭示了青藏高原ADWTs的时空异质性。主要发现包括三个显著特征:夏季相位锁存——48.8%的干转湿(DW)和45.0%的湿转干(WD)事件发生在夏季;显著空间对比——东部/南部外流区以DW转换为主,北部/西北部内陆干旱区以WD转换为主;方向不对称性——WD转换呈显著增加趋势(+0.10次/年,p<0.1),而DW转换基本稳定(-0.047次/年,p>0.1)。机制上,非均匀的季节性PME调整、多年冻土冻融动态以及植被–土壤水分反馈共同驱动了ADWT格局,而大尺度遥相关指数则通过局地水文气候条件的调控,呈现出微弱且区域异质的影响。实践层面,亟需制定针对性的季节性水资源调控策略,包括提高汛前蓄水阈值以应对复合干旱–洪涝风险、利用季内DW频率动态调整防洪调度,以及实施跨季节蓄水以减轻汛后WD导致的水分损失。本研究为青藏高原ADWTs提供了系统性认识,并为该区域防灾减灾提供了科学支撑。


主要图文

  • 图2:1995–2024年青藏高原降水减蒸发(PME)的多时间尺度序列(附标准差σ)。(a)日PME;(b)月PME;(c)年PME。

    图4:多年平均降水减蒸发(PME;水可用性)的空间分布及其趋势(附标准差σ)。(a)多年平均PME;(b)其趋势;季节PME及其趋势:(c、d)春季,(e、f)夏季,(g、h)秋季,(i、j)冬季。

  • 图6:骤旱骤湿转换的季节分布。

  • 图7:骤旱骤湿转换的空间分布及主要河流流域对比。(a)干转湿(DW)转换频次;(b)湿转干(WD)转换频次。

  • 图8:年骤旱骤湿转换频次与8个遥相关指数之间的像素级偏相关系数(r)。转换频次经log1p变换,指数经z标准化,偏相关计算时控制了线性时间项及其他遥相关指数。黑色“+”号标记相关性较强区域(|r|≥0.55)。


研究结论

青藏高原区域水可用性(PME)呈现稳定的年际波动和清晰的东南–西北梯度。年均PME为423.5±32.2 mm/yr,无显著长期趋势;夏季贡献了年际变率的主体(相关系数r=0.816),春季次之(r=0.426)。空间上,湿润的东南外流区与干旱的西北内陆区形成鲜明对比,且“湿核”区域表现出更明显的干燥化趋势,表明湿润区对环流异常更敏感。

ADWTs具有三大核心时空特征:夏季锁相、东西/南北空间分异、方向不对称且WD事件持续增加。夏季贡献了约一半的转换事件;DW频次与春季PME密切相关(r=0.70),而WD频次与冬季冷源强迫相关(r=0.70)。60.7%的像素以DW为主,37.9%以WD为主,且WD频次以+0.10次/年的速度显著上升(p<0.1),DW趋势不显著,两类转换几乎统计独立(r≈0)。

驱动机制涉及非均匀的季节性水收支调整、冻土冻融过程和植被–土壤反馈。冬春季PME普遍下降形成干旱先期条件,加剧了夏季季风脉冲引发的DW事件;夏季局地PME增强(如恒河盆地)进一步强化了季节内波动。冻土融化期增强土壤水分连通性,而冻结期抑制地气湍流交换,后者有助于解释秋季末至冬季初WD事件的高频发生。

大尺度遥相关指数的年际关联微弱且区域异质,受局地气候条件调控。像素级偏相关分析显示,ENSO、PDO和DMI(IOD)在部分区域(如西南部)呈现可解释的相关信号,但整体空间破碎;AO、NAO、EAWR和SCAND等中高纬模态仅呈镶嵌式分布,表明遥相关影响通过复杂地形和季风–西风相互作用被强烈调制,不存在统一的全区域关系。


论文引用(APA格式)

Gong, Q., Zhang, X., Ao, S., Wang, Y., Wang, L., Guo, X., Li, T., Xie, Z., Lin, S., & Zhao, L. (2026). Spatiotemporal heterogeneity and teleconnection drivers of abrupt dry-wet transitions across the Tibetan Plateau. Atmospheric Research342, 109168. https://doi.org/10.1016/j.atmosres.2026.109168

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  1. CONNECT:[ UseTime:0.001031s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001596s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000752s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000692s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001406s ]
  6. SELECT * FROM `set` [ RunTime:0.000633s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001542s ]
  8. SELECT * FROM `article` WHERE `id` = 593705 LIMIT 1 [ RunTime:0.003561s ]
  9. UPDATE `article` SET `lasttime` = 1782540117 WHERE `id` = 593705 [ RunTime:0.002451s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000697s ]
  11. SELECT * FROM `article` WHERE `id` < 593705 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001122s ]
  12. SELECT * FROM `article` WHERE `id` > 593705 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000958s ]
  13. SELECT * FROM `article` WHERE `id` < 593705 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002711s ]
  14. SELECT * FROM `article` WHERE `id` < 593705 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.022875s ]
  15. SELECT * FROM `article` WHERE `id` < 593705 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.026852s ]
0.171888s