在复杂地形中表面能量平衡残余的表征
Martina Destro1, Mathias W Rotach1, Manuela Lehner1
1Institute of Atmospheric and Cryospheric Sciences, University of Innsbruck, Innsbruck, Austria.
在复杂的地形中关闭表面能量平衡是具有挑战性的. 我们的研究揭示了大气稳定性和特定地点条件影响的显著的每日和季节性能量残留,突出了需要详细观察的必要性.
科学领域:
- 大气科学 大气科学
- 地质物理学 地质物理学
- 环境科学 环境科学
背景情况:
- 准确的表面能量平衡 (SEB) 关闭对于理解地球系统中的能量转移至关重要.
- 复杂的地形为SEB关闭带来了独特的挑战,原因是表面的异质性质和大气过程.
- 之前的研究经常简化了地形复杂性,限制了SEB封闭模型的概括性.
研究的目的:
- 在复杂的地形中分析表面能量平衡余量 (Res) 通过净辐射 (Rn) 在各种条件下正常化.
- 研究Res/Rn的日间和年度周期及其与大气稳定性和流混合的关系.
- 评估特定气象事件 (风,山谷风) 对山区SEB关闭的影响.
主要方法:
- 使用i-Box网络在奥地利Inn谷的多站点分析.
- 通过净辐射 (Rn) 规范化的SEB余量 (Res) 的表征.
- 检查日间和年度周期,大气稳定性,流混合和流量条件.
主要成果:
- 观察到显著的日间Res/Rn周期:白天呈阳性 (能量增加),晚上呈阴性 (能量损失).
- 在夜间稳定的条件下发生了很大的Res/Rn值;在对流混合下发现了最小值.
- 年度周期呈现出不同的模式,温暖的月份白天的Res/Rn较小,夜间的Res/Rn较大,相反的是寒冷的月份.
- 不稳定的条件降低了Res/Rn大小,而稳定的条件增加了它. 福恩和山谷风事件带来了额外的变化.
结论:
- 大气稳定性,流结构和流动模式显著影响复杂地形中的SEB关闭.
- Res/Rn的大小和行为高度特定于地点,强调需要空间分布的观测.
- 在复杂的地形中,精确的SEB封闭需要考虑一般大气条件和当地地形效应.
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