Using a Modified Soil-Plant-Atmosphere Scheme (MSPAS) to simulate the interaction between land surface processes and atmospheric boundary layer in semi-arid regions

2004 ◽  
Vol 21 (2) ◽  
pp. 245-259 ◽  
Author(s):  
Shuhua Liu ◽  
Xu Yue ◽  
Fei Hu ◽  
Huizhi Liu
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Land Surface ◽  
Arid Regions ◽  
Surface Processes ◽  
Land Surface Processes ◽  
Semi Arid ◽  
Modified Soil

scholarly journals Land-surface processes and summer-cloud-precipitation characteristics in the Tibetan Plateau and their effects on downstream weather: a review and perspective

2020 ◽  
Vol 7 (3) ◽  
pp. 500-515 ◽  
Author(s):  
Yunfei Fu ◽  
Yaoming Ma ◽  
Lei Zhong ◽  
Yuanjian Yang ◽  
Xueliang Guo ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Tibetan Plateau ◽  
Land Surface ◽  
Sensible Heat Flux ◽  
Vertical Direction ◽  
Heat Fluxes ◽  
Surface Processes ◽  
Convective Precipitation ◽  
The Tibetan Plateau ◽  
Land Surface Processes

Abstract Correct understanding of the land-surface processes and cloud-precipitation processes in the Tibetan Plateau (TP) is an important prerequisite for the study and forecast of the downstream activities of weather systems and one of the key points for understanding the global atmospheric movement. In order to show the achievements that have been made, this paper reviews the progress on the observations for the atmospheric boundary layer, land-surface heat fluxes, cloud-precipitation distributions and vertical structures by using ground- and space-based multiplatform, multisensor instruments and the effect of the cloud system in the TP on the downstream weather. The results show that the form drag related to the topography, land–atmosphere momentum and scalar fluxes is an important part of the parameterization process. The sensible heat flux decreased especially in the central and northern TP caused by the decrease in wind speeds and the differences in the ground-air temperatures. Observations show that the cloud and precipitation over the TP have a strong diurnal variation. Studies also show the compressed-air column in the troposphere by the higher-altitude terrain of the TP makes particles inside clouds vary at a shorter distance in the vertical direction than those in the non-plateau area so that precipitation intensity over the TP is usually small with short duration, and the vertical structure of the convective precipitation over the TP is obviously different from that in other regions. In addition, the influence of the TP on severe weather downstream is preliminarily understood from the mechanism. It is necessary to use model simulations and observation techniques to reveal the difference between cloud precipitation in the TP and non-plateau areas in order to understand the cloud microphysical parameters over the TP and the processes of the land boundary layer affecting cloud, precipitation and weather in the downstream regions.

Modelling the surface processes and the atmospheric boundary layer for semi-arid conditions

1996 ◽  
Vol 80 (2-4) ◽  
pp. 263-287 ◽  
Author(s):  
H. Giordani ◽  
J. Noilhan ◽  
P. Lacarrère ◽  
P. Bessemoulin ◽  
P. Mascart
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Surface Processes ◽  
Arid Conditions ◽  
Semi Arid

An Overview of the Land Surface Processes Experiment (Laspex) over a Semi-Arid Region of India

2003 ◽  
Vol 106 (3) ◽  
pp. 561-572 ◽  
Author(s):  
K. G. Vernekar ◽  
S. Sinha ◽  
L. K. Sadani ◽  
S. Sivaramakrishnan ◽  
S. S. Parasnis ◽  
...  
Keyword(s):  
Land Surface ◽  
Arid Region ◽  
Surface Processes ◽  
Land Surface Processes ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Quantifying the impact of groundwater depth on evapotranspiration in a semi-arid grassland region

2010 ◽  
Vol 7 (5) ◽  
pp. 6887-6923 ◽  
Author(s):  
M. E. Soylu ◽  
E. Istanbulluoglu ◽  
J. D. Lenters ◽  
T. Wang
Keyword(s):  
Water Table ◽  
Land Surface ◽  
Capillary Rise ◽  
Groundwater Depth ◽  
Surface Processes ◽  
Richards Equation ◽  
Land Surface Processes ◽  
South Central ◽  
The Impact ◽  
Semi Arid

Abstract. The interactions between shallow groundwater and land surface processes, mediated by capillary rise processes from groundwater, may play an important role in the ecohydrology of riparian zones in both humid and semi-arid ecosystems. Some recent land surface models (LSM) incorporate the contribution of groundwater to land surface processes with varying levels of complexity. In this paper, we examine the sensitivity of evapotranspiration at the land surface to the depth of groundwater using three models with different levels of complexity, two widely used representative soil hydraulic parameter sets, and four soil textures. The selected models are Hydrus-1D, which solves the Richards equation, the Integrated Biosphere Simulator (IBIS), which uses a multi-bucket approach with interactions between buckets, and a single-bucket model coupled with a classic simple capillary rise flux approximation. These models are first corroborated with field observations of soil moisture and groundwater elevation data from a site located in south-central Nebraska, USA. We then examine the sensitivity of the Richards equation to node spacing, as well as the relationship between groundwater depth and the ratio of actual to potential evapotranspiration (ET) for various soil textures and water table depths. The results show that selecting one representative soil parameter set over another may result in up to a 70% difference in actual ET (relative to the potential ET) when the depth to water table is in 0–5 m depending on the soil type. Moreover, solution type of the Richards equation and node spacing have also effect on surface ET up to 50% and 30% respectively depending on the depth-to-groundwater and node spacing. Therefore, further studies are needed to understand the sensitivities of land surface and atmospheric models to the existence of saturated layers, including studies with more field validation in regions with different climates and land cover types.

Walter Orr Roberts Lecture

1995 ◽  
Vol 76 (8) ◽  
pp. 1445-1449 ◽  
Author(s):  
Robert E. Dickinson
Keyword(s):  
Boundary Layer ◽  
Land Surface ◽  
Climate Models ◽  
Surface Radiation ◽  
Surface Processes ◽  
Current Status ◽  
Atmospheric Models ◽  
Land Surface Processes ◽  
Boundary Layer Processes

This paper, as the written version of the 1995 AMS Walter Orr Roberts Lecture, provides an overview of the current status of the inclusion of land surface processes in climate models. These processes provide fluxes of water and energy to atmospheric models and help determine surface meteorology and climate over the continents. With the increasing complexity and importance of these parameterizations and their detailed treatments of the roles of soils and vegetation have come greater demands for observational programs to evaluate their success and to provide required parameters. Intercomparisons between different land models are also becoming increasingly valuable as a means of identifying their weaknesses and limitations. The paper especially highlights the need for further emphasis on the coupling between land and the atmosphere in models. In particular, it calls for further evolution and improvement of the model treatments of precipitation, cloud effects on surface radiation, and boundary layer processes.

Land surface processes and Sahel climate

2000 ◽  
Vol 38 (1) ◽  
pp. 117-140 ◽  
Author(s):  
Sharon Nicholson
Keyword(s):  
Land Surface ◽  
Surface Processes ◽  
Land Surface Processes

Land Surface Processes Relevant to Sub-seasonal to Seasonal (S2S) Prediction

2019 ◽  
pp. 165-181 ◽  
Author(s):  
Paul A. Dirmeyer ◽  
Pierre Gentine ◽  
Michael B. Ek ◽  
Gianpaolo Balsamo
Keyword(s):  
Land Surface ◽  
Surface Processes ◽  
Land Surface Processes
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