scholarly journals Warming Effort and Energy Budget Difference of Various Human Land Use Intensity: Case Study of Beijing, China

Land ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 280
Author(s):  
Shenghui Zhou ◽  
Ke Wang ◽  
Shiqi Yang ◽  
Wenli Li ◽  
Yuxuan Zhang ◽  
...  
Keyword(s):  
Land Use ◽  
Energy Balance ◽  
Surface Energy ◽  
Energy Budget ◽  
Human Activities ◽  
Radiative Forcing ◽  
Surface Energy Balance ◽  
Land Use Intensity ◽  
Human Land Use ◽  
Land Use Types

Human land use intensity affects the surface energy balance by changing the biogeophysical parameters. This study used Moderate Resolution Imaging Spectroradiometer remote sensing data and surface energy balance algorithms to quantify changes in surface energy budgets corresponding to changes in land use in Beijing from 2000 to 2015. Land use was reclassified by considering land use intensity. The difference in the latent heat flux (LE) and net radiation (Rn) (LE−Rn) expressed the warming or cooling effect. The results showed that: (i) The increasing trend of net longwave radiation in Beijing offset the decreasing trend of net shortwave radiation. The Rn changed slightly, while the LE and LE−Rn showed a significant increase of 0.55 and 0.56 W/(m²∙year), respectively. The findings indicated that considering only radiative forcing, or even Rn, was not enough to measure the impacts of land use change on the energy budget. (ii) The order of Rn, LE, and LE−Rn values from high to low were natural and seminatural areas, cropland, mixed pixel areas, urban expansion areas, and old urban areas. Compared with natural and seminatural areas, the changing LE−Rn trend in the other four land use types decreased with the increase in human impact intensity, indicating that human activities weakened the positive change trend of LE−Rn and increased the warming effect. (iii) Although the temporal trend of LE increased in Beijing from 2000 to 2015, the effect of Rn on LE−Rn was greater than that of LE, especially in the four land use types affected by human activities. The results for surface temperature in various land use types confirmed this point. This study highlights the energy budget differences of various land use types affected by human activities. It makes an important contribution to understanding the urban heat island effect from a biogeophysical perspective.

Surface energy balance algorithm for land-based consumption water use of different land use-cover types in arid-semiarid regions

2016 ◽  
Vol 16 (6) ◽  
pp. 1497-1513
Author(s):  
Shereif H. Mahmoud ◽  
A. A. Alazba
Keyword(s):  
Land Use ◽  
Energy Balance ◽  
Surface Energy ◽  
Water Use ◽  
Water Consumption ◽  
Surface Energy Balance ◽  
Agricultural Land ◽  
Eastern Province ◽  
Very High ◽  
Coastal Lowlands

Spatiotemporal distributions of water consumption for various land use-cover types over the Eastern province of Saudi Arabia were estimated using Surface Energy Balance Algorithm. Water consumption of various land use and cover classes shows similar seasonal dynamic trends. The spatial distribution of annual actual evapotranspiration (AET) shows low values in the Empty Quarter (231–438 mm/yr), and moderate values in the Eastern Province borders (439–731 mm/yr). Very high AET values were observed in irrigated croplands in the Northern plains, Hafar Al-Batin, the central coastal lowlands, and the southern coastal lowlands, where annual AET ranged from 732 to 1,790 mm/yr, representing the majority of the study area agricultural land. Evaporative behavior of land use-cover types indicated that irrigated cropland, which occupies 0.37% of the study area, has an average daily AET ranging from 9.2 mm/day in January to a maximum value in April (30 mm/day). Average annual water use by irrigated cropland is relatively very high and it is roughly 1,786.9 mm/yr, while water bodies, which cover 0.023% (121.2 km2) of the study area, also had relatively high mean AET (660.8 mm/yr). Overall, AET rates for irrigated cropland are much higher than for other land uses.

scholarly journals Influência da Superfície no Balanço de Energia e na Intensidade da Precipitação Urbana (Influence of the Surface Energy Balance and Intensity Urban Rainfall)

2011 ◽  
Vol 3 (3) ◽  
pp. 204
Author(s):  
Taciana Lima Araujo ◽  
Enio Pereira Souza
Keyword(s):  
Energy Balance ◽  
Surface Energy ◽  
Energy Budget ◽  
Surface Energy Balance ◽  
Atmospheric Modeling ◽  
Radiation Budget ◽  
Surface Processes ◽  
Regional Atmospheric Modeling System ◽  
Regional Atmospheric Modeling ◽  
The City

O objetivo deste trabalho é estudar, através da modelagem numérica da atmosfera, os processos de superfície que determinam o saldo de radiação e a precipitação na zona urbana da cidade do Recife-PE. O modelo utilizado é o Brazilian developments on the Regional Atmospheric Modeling System - BRAMS. Uma melhora na representação dos processos de superfície em áreas urbanas foi obtida através do acoplamento entre o modelo BRAMS e um esquema específico para a representação da dinâmica urbana, o esquema Town Energy Budget - TEB. Foram realizados dois experimentos para testar a sensibilidade do modelo à representação da cidade. A consideração da superfície urbana aumenta o saldo de radiação sobre a cidade porque diminui o albedo da superfície e diminui a radiação de onda longa emitida. A influência das regiões urbanas nesses processos altera os fluxos de energia em superfície e, causa aumento da precipitação.Palavras-chave: BRAMS, região urbana, saldo de radiação.  Influence of the Surface Energy Balance and Intensity Urban Rainfall ABSTRACTThe objective of this work is to study the surface processes that determine the radiation budget and the precipitation at the urban area of the city of Recife-PE. The model used is the Brazilian developments on the Regional Atmospheric Modeling System - BRAMS. An improvement in the representation of the surface processes in urban areas was achieved through the coupling of the BRAMS model with a scheme suitable to representing the urban dynamics, the Town Energy Budget - TEB. Two experiments were run to test the model’s sensitivity to the city representation. The consideration of the urban surface increases the radiation budget over the city because it diminishes the surface albedo and the upcoming long wave radiation. The influence of the urban area alters the surface energy fluxes and increases the precipitation.Keywords: BRAMS, urban region, radiation budget

scholarly journals Diurnal land surface energy balance partitioning estimated from the thermodynamic limit of a cold heat engine

2018 ◽  
Author(s):  
Axel Kleidon ◽  
Maik Renner
Keyword(s):  
Energy Balance ◽  
Surface Energy ◽  
Thermodynamic Limit ◽  
Land Surface ◽  
Radiative Forcing ◽  
Surface Energy Balance ◽  
Heat Engine ◽  
Turbulent Fluxes ◽  
Heat Fluxes ◽  
Turbulent Heat

Abstract. Turbulent fluxes strongly shape the conditions at the land surface, yet they are typically formulated in terms of semi-empirical parameterisations that make it difficult to derive theoretical estimates of how global change impacts land surface functioning. Here, we describe these turbulent fluxes as the result of a thermodynamic process that generates work to sustain convective motion and thus maintains the turbulent exchange between the land surface and the atmosphere. We first derive a limit from the second law of thermodynamics that is equivalent to the Carnot limit, but which explicitly accounts for diurnal heat storage changes in the lower atmosphere. We then use this limit of a cold heat engine together with the surface energy balance to infer the maximum power that can be derived from the turbulent fluxes for a given solar radiative forcing. The surface energy balance partitioning estimated from this thermodynamic limit requires no empirical parameters and compares very well with the observed partitioning of absorbed solar radiation into radiative and turbulent heat fluxes across a range of climates, with correlation coefficients r2 ≥ 95 % and slopes near one. These results suggest that turbulent heat fluxes on land operate near their thermodynamic limit on how much convection can be generated from the local radiative forcing. It implies that this type of approach can be used to derive first-order estimates of global change that are solely based on physical principles.

scholarly journals Erratum: Zhou, S., et al. Warming Effort and Energy Budget Difference of Various Human Land Use Intensity: Case Study of Beijing, China. Land 2020, 9, 280

Land ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 60
Author(s):  
Shenghui Zhou ◽  
Ke Wang ◽  
Shiqi Yang ◽  
Wenli Li ◽  
Yuxuan Zhang ◽  
...  
Keyword(s):  
Land Use ◽  
Energy Budget ◽  
Land Use Intensity ◽  
Human Land Use ◽  
Beijing China ◽  
Published Paper

The authors would like to change the authors’ affiliation in the recent published paper [...]

Investigating the relationship between soil moisture and evapotranspiration at different surfaces. Do we improve fluxes just improving the land use in models?

2020 ◽  
Author(s):  
Carlos Román-Cascón ◽  
Marie Lothon ◽  
Fabienne Lohou ◽  
Aurore Brut ◽  
Oscar Hartogensis ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Moisture ◽  
Energy Balance ◽  
Surface Energy ◽  
Surface Energy Balance ◽  
Physiological State ◽  
Sensible Heat Flux ◽  
Surface Fluxes ◽  
Wave Radiation ◽  
The South

<p>A correct spatial representation of the surface energy balance is still a challenge. In a first step, and assuming a correct knowledge of the incoming short-wave radiation, it is the land cover that mostly controls the albedo and the long-wave radiation emitted to the atmosphere, influencing significantly the net radiation available at the surface and the surface temperature. In a second step, the partitioning of this energy into evapotranspiration and sensible heat flux is, in part, controlled by the availability of soil moisture but also by the type, characteristics and physiological state of the vegetation covering the surface, since plants provide a pathway for soil moisture to the atmosphere through transpiration.</p><p>Hence, to correctly model the surface energy balance, we face three main challenges: an appropriate representation of the land use, soil moisture and a correct modelling of how plants regulate their stomatal behaviour under different soil-moisture limited conditions.</p><p>In this work, by using <em>in situ</em> data we explore the relations between soil moisture and evapotranspiration from several vegetation types at different soil-moisture limited regions: a wetter area in the south of France and a drier one in the south of Spain. For this, we try to distinguish different periods and vegetation states. Since significant differences are observed for the various plant types, we investigate whether using a more realistic and higher-resolution land-use database in the Weather Research and Forecasting (WRF) model improves the simulation of soil moisture and surface fluxes.</p>

Sign in / Sign up

Export Citation Format

Share Document