Effect of Mesoscale Land Use Change on Characteristics of Convective Boundary Layer: Semi-Idealized Large Eddy Simulations over Northwest China

Cao, Bangjun; Zhang, Shuwen; Li, Deqin; Liu, Yanlin; Zhou, Linfan; Wang, Jiemin

doi:10.1007/s13351-018-7185-8

Cited by 3 publications

(4 citation statements)

References 32 publications

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“…First, τ S at the oasis site is longer than that at the Gobi site (Figure 4, Table 4). This is because the SBL at the oasis site is influenced by the “oasis effect” (Chu et al ., 2005; Cao et al ., 2018). The evaporation of water will consume large amounts of solar radiation over the oasis site, while only a small fraction of energy will be used in the same way at the Gobi site.…”

Section: Resultsmentioning

confidence: 99%

“…However, in the arid and semi‐arid areas of China, there are many complex heterogeneous surfaces (Cao et al ., 2018; 2020; Liu et al ., 2011; Li et al ., 2013; Zhang et al ., 2016), including Gobi, desert, rural, and oasis areas, among others. The DTR should differ significantly over these surfaces, which may have different relationship with LW net24 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of radiative forcing on stable boundary layer development and diurnal temperature range over the central Heihe River Basin, China

Cao

Zhu

Zheng

et al. 2020

Atmospheric Science Letters

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Using observations from the Heihe Watershed Allied Telemetry Experimental Research (HiWATER) datasets, the effect of radiative forcing on the development of the stable boundary layer (SBL) and diurnal temperature range (DTR) during summer over the central Heihe River Basin is investigated in this paper. Using a radiative temperature scale based on net longwave radiation (LW net24), the DTR and the strength of SBL (δT S) are scaled, and the cycle and the year-to-year variability before and after scaling are analyzed. The results show that both DTR from air and surface temperatures have a significant correlation with LW net24 , and their correlation coefficients are different over different underlying surfaces. The cycle of DTR from 5-m air temperature is similar with that of LW net24. There is only a diurnal cycle in terms of 5-m air temperature after scaling. Both the trends of the scaled DTR (DTR sc) and the scaled strength of SBL (δT Ssc) increase with the growth time of the stable boundary layer (SBL) (τ S). The period of τ S is similar with that of DTR sc. τ S is longer at the oasis site than at the Gobi site, which is related to the oasis effect. In addition, the greater the friction velocity, the smaller the DTR sc and δT Ssc. The wind shear enables heat to disperse during SBL.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of radiative forcing on stable boundary layer development and diurnal temperature range over the central Heihe River Basin, China

Cao

Zhu

Zheng

et al. 2020

Atmospheric Science Letters

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“…Ref. [12] found that when soil moisture in oases approaches saturation, the secondary circulation (SC)/turbulent organized structure (TOS) is strongest/weakest. As the soil moisture content in the oasis decreases, SC (TOS) will become weaker (stronger).…”

Section: Introductionmentioning

confidence: 99%

Impact of High-Resolution Land Cover on Simulation of a Warm-Sector Torrential Rainfall Event in Guangzhou

Wang,

Liu,

Ping

et al. 2024

Atmosphere

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This study on the warm-sector heavy rainfall event in Guangzhou on 7 May 2017, examined the effects and mechanisms of incorporating 30 m high-resolution land surface data into its numerical simulation. The updated 1km numerical model, integrating 30 m high-resolution land surface data, successfully captured the initiation, back-building, and organized development of warm-sector convections in Huadu and Zengcheng District. The analysis revealed that the high spatial resolution of the surface data led to a reduced urban area footprint (urban −6.31%), increased vegetation cover (forest 11.63%, croplands 1%), and enhanced surface runoff (water 2.77%) compared with a model’s default land cover (900 m). These changes mitigated the urban heat island (UHI) effect within the metropolitan area and decreased the surface sensible heat flux. This reduction contributed to a pronounced temperature gradient between Huadu Mountain and the urban area. Additionally, a stronger high-pressure recirculation and sea–land breezes facilitated the transport of warm and moist air from the sea inland, creating a humid corridor along the sea–land interface. The consistent influx of warm and moist air near the mountain front, where strong temperature gradients were present, forcibly triggered warm-sector convection, intensifying its organization. This study highlighted the critical role of high-resolution land surface data in the accurate numerical simulation of warm-sector heavy rainfall.

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“…In recent years, large-eddy simulation (LES) models have been developed to explicitly simulate heterogeneous land surface processes to provide the basis for the parameterization of land surface heterogeneity in large-scale models. In LES models (e.g., Deardorff, 1978;Moeng, 1984;Cao et al, 2018), turbulence is divided into grid-resolved large eddies and sub-grid eddies in the inertial subrange. The effects of sub-grid eddies are commonly quantified using a sub-grid closure scheme, such as the Smagorinsky closure (Smagorinsky, 1963) or the k-l closure (Deardorff, 1980).…”

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confidence: 99%

Large–Eddy Simulation of Turbulent Flux Patterns over Oasis Surface

Cao

Shao

Yang

et al. 2023

Preprint

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Abstract. Large-eddy simulation (LES) is widely used for studying surface fluxes over heterogeneous areas, but the parameterizations based on the Monin-Obukhov Similarity Theory (MOST) often used violate the basic assumptions of the very theory and generate inconsistencies with the LES model closures. Experience shows that LES simulated surface fluxes are strongly dependent on model resolution. Here, we propose a novel scheme for turbulent flux estimates in LES models, which computes the fluxes locally using the LES sub-grid closure scheme (here a k-l scheme) and constrained on the macroscopic scale using the MOST. In comparison with several other schemes, the new scheme performs better for various types of land surfaces tested. The surface fluxes estimated with the new scheme are compared with the field measurements over an oasis surface at different height levels. Other quantities related to surface energy balance, including net radiation, ground heat flux and surface skin temperature, simulated using the new scheme are also found to be consistent with the measurements. Sensitivity tests show that the uncertainty of MOST flux vary little with horizontal resolution, while the macroscopic constraint of MOST increases with horizontal resolution.

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Effect of Mesoscale Land Use Change on Characteristics of Convective Boundary Layer: Semi-Idealized Large Eddy Simulations over Northwest China

Cited by 3 publications

References 32 publications

Effects of radiative forcing on stable boundary layer development and diurnal temperature range over the central Heihe River Basin, China

Effects of radiative forcing on stable boundary layer development and diurnal temperature range over the central Heihe River Basin, China

Impact of High-Resolution Land Cover on Simulation of a Warm-Sector Torrential Rainfall Event in Guangzhou

Large–Eddy Simulation of Turbulent Flux Patterns over Oasis Surface

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