Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
doi:10.5194/gmd-2016-253
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Development and technical paper
02 Dec 2016
Review status
This discussion paper is under review for the journal Geoscientific Model Development (GMD).
Influence of Geographic Coordinate System on Weather Simulations of Atmospheric Emissions
Yanni Cao1,2,4, Guido Cervone1,2,4,5, Zachary Barkely3, Thomas Lauvaux3, Aijun Deng3, and Alan Taylor2 1Goeinformatics and Earth Observation Laboratory, The Pennsylvania State University, University Park, PA
2Department of Geography, The Pennsylvania State University, University Park, PA
3Department of Meteorology, The Pennsylvania State University, University Park, PA
4Institute for CyberScience, The Pennsylvania State University, University Park, PA
5Research Application Laboratory, National Center for Atmospheric Research, Boulder CO
Abstract. Numerical atmospheric models can generate simulations at very high spatial and temporal resolutions. Many of such models, including the Weather Research and Forecasting (WRF), assume a spherical geographic coordinate system to represent the data and for their computations. However, most if not all Geographic Information System (GIS) data use a spheroid datum because it best represents the surface of the earth. WRF and other numerical systems, simply assume that GIS layers can be input as if they were in a spherical coordinate system.

The difference when reprojecting standard GIS layers onto a sphere can result in latitudinal errors of up to 21 km in the mid-latitudes. Recent studies have suggested that for very high resolution applications, there might be an impact when the GIS input data (e.g. terrain land use, orography) are not reprojected. These impacts introduced by the difference in coordinate systems remain unclear. This research investigates the role and importance of reprojecting GIS layers used by WRF as input by performing sensitivity studies of greenhouse gas transport and dispersion in Northeast Pennsylvania.


Citation: Cao, Y., Cervone, G., Barkely, Z., Lauvaux, T., Deng, A., and Taylor, A.: Influence of Geographic Coordinate System on Weather Simulations of Atmospheric Emissions, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2016-253, in review, 2016.
Yanni Cao et al.
Yanni Cao et al.
Yanni Cao et al.

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This research investigates the role and importance of reprojecting geographic information system layers used by weather numerical models as input by performing sensitivity studies of greenhouse gas transport and dispersion in Northeast Pennsylvania. To bridge the gap between geographic information system data and atmospheric models, this study presents an innovative approach by creating R code to automatically generate model input from geographic data and analyze the model output.
This research investigates the role and importance of reprojecting geographic information system...
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