Effects of Soil Moisture Heterogeneity on Temperature-Humidity Dissimilarity in the Convective Boundary Layer

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Cheng Liu, Heping Liu, Jianping Huang, Xiaozhen Fang, Ren-Guo Zhu, Wei Guo, YuanYuan Pan
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引用次数: 0

Abstract

Surface moisture heterogeneity degrades temperature-humidity ( θ $\theta $ - q $q$ ) similarity in the atmospheric surface layer, yet the underlying physical mechanisms driving this dissimilarity remain underexplored. This study employs large-eddy simulations coupled with a land-surface model to investigate θ $\theta $ - q $q$ similarity in the convective boundary layer (CBL) over surfaces with varying scales of surface moisture heterogeneity. Results reveal that as the heterogeneity scale increases, patch-scale thermally induced circulations develop and interact with cellular turbulent organized structures, significantly altering scalar transport and turbulence dynamics. The patch-scale thermally induced circulations enhance horizontal advection, modify the production and transport of scalar variances, and lead to a disproportionate increase in the standard deviations of temperature ( σ θ ${\sigma }_{\theta }$ ) and humidity ( σ q ${\sigma }_{q}$ ), accompanied by a reduction in θ $\theta $ - q $q$ covariance ( θ q $\overline{{\theta }^{\mathit{\prime }}{q}^{\mathit{\prime }}}$ ). As a result, θ $\theta $ - q $q$ similarity is substantially reduced throughout the CBL. Spectral analysis reveals that θ $\theta $ - q $q$ dissimilarity is most strongly influenced by turbulent motions at scales corresponding to patch lengths. The findings offer insights into the role of surface heterogeneity in shaping scalar similarity in the CBL, with implications for land-atmosphere interactions and parameterization in numerical models.

Abstract Image

土壤水分非均质性对对流边界层温湿度差异的影响
地表水分的不均匀性降低了大气表层温度-湿度(θ $\theta $ - q $q$)的相似性,但驱动这种差异的潜在物理机制仍未得到充分探讨。本文采用大涡模拟与陆地表面模式相结合的方法,研究了不同尺度地表水分非均质性条件下对流边界层(CBL)的θ $\theta $ - q $q$相似性。结果表明,随着非均质尺度的增加,斑块尺度的热诱导环流发展并与细胞湍流组织结构相互作用,显著改变了标量输运和湍流动力学。斑块尺度的热诱导环流增强了水平平流,改变了标量方差的产生和输运;并导致温度(σ θ ${\sigma }_{\theta }$)和湿度(σ q ${\sigma }_{q}$)的标准差不成比例地增加,伴随着θ $\theta $ - q $q$协方差(θ′)的减小Q´$\overline{{\theta }^{\mathit{\prime }}{q}^{\mathit{\prime }}}$)。因此,θ $\theta $ - q $q$相似度在整个CBL中大大降低。光谱分析表明,θ $\theta $ - q $q$不相似度在相应的斑块长度尺度上受湍流运动的影响最大。这些发现提供了对地表异质性在形成CBL中标量相似性中的作用的见解,对陆地-大气相互作用和数值模式的参数化具有重要意义。
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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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