Influence of subsurface hydrodynamics on the lower atmosphere

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Title:Main Title: Influence of subsurface hydrodynamics on the lower atmosphere
Description:Abstract: The subsurface hydrodynamics, which may be represented through the presence of a dynamic free water table, influences the mass and energy balance at land surface and lower atmosphere. On the other hand, the land surface, which is directly connected to the atmosphere, affects the climate system. The land surface mass and energy balance is usually calculated by the land surface parameterization schemes (LSPs), which tend to consider the subsurface hydrodynamics as a secondary process. However, it has been shown in a number of studies that the moving free water table has significant influence on the land surface processes. Because of this influence, two-way feedbacks with the weather generating processes of the lower atmosphere may exist. Due to the technological developments over the last few decades, a number of simulation platforms have been developed to study the spatiotemporal variability of hydrologic responses on lower atmosphere. In this study, we apply the fully coupled model ParFlow.CLM on a 28000 km2 model domain encompassing the Rur catchment, Germany, at a spatial resolution of 103 m in horizontal direction, 10-2 to 100 m in vertical direction and at an hourly temporal resolution. The ParFlow.CLM model includes the mass and energy balance at land surface as well as the three dimensional variably saturated subsurface flow and overland flow. ParFlow.CLM was configured over computational domains well beyond the actual Rur watershed boundaries to account for cross-watershed flow. The model was forced with atmospheric data obtained from the climate model COSMO. The resulting catchment model consists of up to 106 cells which were implemented over 882 processors on the supercomputer JUGENE hosted by the Juelich Supercomputing Centre, Germany. The land surface mass and energy fluxes were simulated and the influence of the groundwater dynamics on these fluxes was investigated. The analyses showed a clear connection between groundwater table depth and the components of land surface mass and energy balance. Proof was also found about the strong seasonal variability of this influence.
Responsible Party
Creator:A.S.M. Mostaquimura Rahman (Author)
Publisher:CRC/TR32 Database (TR32DB)
Publication Year:2013
Topic
TR32 Topic:Atmosphere
Related Subproject:D7
Subject:Keyword: PhD Report
File Details
Filename:Report3_Rahman_2012.pdf
Data Type:Text - Text
File Size:2 MB
Date:Available: 01.10.2012
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Own Subproject
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:[TR32DB] Data policy agreement
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Specific Information - Report
Report Date:1st of October, 2012
Report Type:PhD Report
Report City:Bonn, Germany
Report Institution:Meteorological Institute, University Bonn
Number of Pages:13 (1 - 13)
Further Information:TR32 Student Report Phase II
Metadata Details
Metadata Creator:A.S.M.Mostaquimur Rahman
Metadata Created:04.12.2013
Metadata Last Updated:04.12.2013
Subproject:D7
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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