The integrated urban land model

Meng, Chunlei

doi:10.1002/2015ms000450

Cited by 28 publications

(33 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Instead of explicitly calculating the urban physical processes (e.g., the reduced-albedo effect from multiple-reflections inside a street canyon), they are implicitly taken into account in the land-surface parameters in accordance to detailed observational studies, modeling experiments and available parameter inventories. This way, TERRA_URB bridges the gap between previous bulk schemes (e.g., URBCLIM [62], Noah/Urban [63] or IUM [64]) and explicit-canyon schemes (e.g., CLM-U [65], BEP [66], TEB [67] or SLUCM [63]), hence provides canopy-dependent urban physics with a low computational cost.…”

Section: Urban Canopy Modelmentioning

confidence: 99%

Megacity-Induced Mesoclimatic Effects in the Lower Atmosphere: A Modeling Study for Multiple Summers over Moscow, Russia

et al. 2018

View full text Add to dashboard Cite

Urbanization leads to distinct meteorological features of urban environments, and one the best-known is the urban heat island (UHI) effect. For megacities, these features become mesoscale phenomena (scale ≥ 10 km) that are amplified by the tropospheric feedbacks, and have substantial implications on human well-being. For the first time, a three-dimensional statistical description of the megacity-induced meteorological effects extending towards the lower troposphere for summer is acquired on a quasi-climatological timescale (a decade) based on high-resolution (1 km) simulations for Moscow with the COSMO-CLM model with and without its urban canopy model TERRA_URB. Our results confirm the features from previous observational and modeling studies, including the UHI itself, the cooling effect above established by the cross-over effect, the urban dry/moist islands and the urban breeze circulation. Particularly, the UHI shows a strong diurnal variation in terms of intensity and vertical extent between daytime (≈0.5 K/≈1.5 km) and nighttime (>3 K/≈150 m). We have discovered a systematic veering in the downwind shift of the UHI spatial pattern established by the Coriolis effect, and an enhanced stable stratification of the rural surroundings established by the urban plumes further downwind. Finally, extending the analysis to multiple summers demonstrates a substantial increase in summer precipitation (up to +25%) over the city center and its leeward side. These urban-caused mesoclimatic effects need to be taken into account in weather and climate services, including the design of future megacities.

show abstract

Section: Urban Canopy Modelmentioning

confidence: 99%

Megacity-Induced Mesoclimatic Effects in the Lower Atmosphere: A Modeling Study for Multiple Summers over Moscow, Russia

et al. 2018

View full text Add to dashboard Cite

show abstract

“…e IUM [16] was developed based on the common land model (CoLM) [20]. IUM integrates the land surface models for urban and natural land surfaces.…”

Section: Model Descriptionmentioning

confidence: 99%

“…where q satj is the saturated specific humidity (kg·kg −1 ), which is associated with the near-surface air pressure and soil temperature; Ψ j is the soil matrix potential (m), which is associated with the soil texture and the soil moisture; g is the gravity constant (m·s −2 ); R w is the gas constant for water vapor (J·Kg −1 ·K −1 ); and T j is the soil temperature (K). e method to calculate the aerodynamic resistance for evaporation at the soil layer interface could be seen in Meng [16]. Water vapor transfer cannot be neglected, especially when the soil surface is very dry, so it is more important in arid and desert regions.…”

Section: Whole Layer Soil Evaporation Schemementioning

confidence: 99%

“…For the coupled method, the urban canopy model (UCM) e.g., [12,13], town energy balance (TEB) model [14], and building energy model (BEM) [15] were developed and coupled with the land surface model for the natural land surfaces. For the integrated method, e.g., [16], the urban land surface model was built directly based on the traditional land surface model. In UCM [17][18][19], the ISE depended on the precipitation, and the drying process of the impervious surface was not considered.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Local and Regional Scale Evaluation of the Integrated Urban Land Model by Comparing with the Common Land Model

Meng

Zhang

2019

Advances in Meteorology

Self Cite

View full text Add to dashboard Cite

Land surface evaporation is not only an important parameter in natural land surface modeling, but a crucial important parameter in urban hydrology modeling. A whole-layer soil evaporation scheme was developed in the integrated urban land model (IUM) to improve the soil evaporation simulation. e impervious surface evaporation (ISE) was used as a component of urban water balance equation. In this paper, the integrated urban land model was validated at one desert site and six urban road sites to emphasize the improvement in the evaporation simulations for arid and urban areas. A sensitivity analysis was implemented in seven basins to expand the utility of the whole layer soil evaporation scheme. For the urban road sites, the validation results indicate that imperious surface evaporation (ISE) plays a crucial role in road surface temperature (RST) simulations on rainy days. For the desert site, the validation results show that the inner layer evaporation is very important in arid regions. For the basins, the analysis results indicate that the relative monthly mean differences in the evapotranspiration (ET) between the simulations with (IUM) and without (Common Land Model (CoLM)) considering the inner layer evaporation range from −8% to 8%, which is proportional to the degree of dryness. In arid areas, especially deserts, the inner layer soil evaporation could not be neglected.

show abstract

“…The urban boundary layer is considerably influenced by its surface characteristics. Within the canopy layer, atmospheric flow is disturbed by buildings and other obstacles located at the surface and hence all related atmospheric processes (Meng, 2015). This creates a complex three-dimensional, time-dependent flow, temperature, and humidity field.…”

Section: Introductionmentioning

confidence: 99%

The microscale obstacle-resolving meteorological model MITRAS v2.0: model theory

Salim

Schlünzen²,

Grawe³

et al. 2018

Geosci. Model Dev.

View full text Add to dashboard Cite

This paper describes the developing theory and underlying processes of the microscale obstacle-resolving model MITRAS version 2. MITRAS calculates wind, temperature, humidity, and precipitation fields, as well as transport within the obstacle layer using Reynolds averaging. It explicitly resolves obstacles, including buildings and overhanging obstacles, to consider their aerodynamic and thermodynamic effects. Buildings are represented by impermeable grid cells at the building positions so that the wind speed vanishes in these grid cells. Wall functions are used to calculate appropriate turbulent fluxes. Most exchange processes at the obstacle surfaces are considered in MITRAS, including turbulent and radiative processes, in order to obtain an accurate surface temperature. MITRAS is also able to simulate the effect of wind turbines. They are parameterized using the actuator-disk concept to account for the reduction in wind speed. The turbulence generation in the wake of a wind turbine is parameterized by adding an additional part to the turbulence mechanical production term in the turbulent kinetic energy equation. Effects of trees are considered explicitly, including the wind speed reduction, turbulence production, and dissipation due to drag forces from plant foliage elements, as well as the radiation absorption and shading. The paper provides not only documentation of the model dynamics and numerical framework but also a solid foundation for future microscale model extensions.Published by Copernicus Publications on behalf of the European Geosciences Union.

show abstract

The integrated urban land model

Cited by 28 publications

References 43 publications

Megacity-Induced Mesoclimatic Effects in the Lower Atmosphere: A Modeling Study for Multiple Summers over Moscow, Russia

Megacity-Induced Mesoclimatic Effects in the Lower Atmosphere: A Modeling Study for Multiple Summers over Moscow, Russia

Local and Regional Scale Evaluation of the Integrated Urban Land Model by Comparing with the Common Land Model

The microscale obstacle-resolving meteorological model MITRAS v2.0: model theory

Contact Info

Product

Resources

About