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distributed modeling of Extraterrestrial Solar Radiation Over the Rugged Terrains of Pakistan

Journal of Mountain Science 2011年第3期8卷 427-436页

作者： Romana AMBREEN QIU Xinfa Iftikhar AHMAD Key laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science & Technology Nanjing 210044 China Department of Geography University of Balochistan Quetta Pakistan

In Pakistan,the solar analogue has been addressed but its surface geographical parameterization has given least *** density of stations and their spatial coverage particularly in difficult peripheral national territories,little or no solar radiation data,non-satisfactory sunshine hours data,and low quality of ground observed cloud cover data create a situation in which the spatial modeling of Extraterrestrial Solar Radiation(ESR) and its ground parameterization got sufficient *** Digital Elevation Model (DEM) input into Geographic Information System (GIS) is a compatible tool to demonstrate the spatial distribution of ESR over the rugged terrains of the study *** the first time,distributed modeling of ESR is done over the rugged terrains of Pakistan,based on DEM and ArcGIS..Results clearly depict that the complex landforms profoundly disrupt the zonal distribution of ESR in *** screening impact of topography is higher on spatial distribution of ESR in winter and considerably low in *** combined effect of topography and latitude is ***,the model was further testified by plotting Rb (ratio of ESR quantity over rugged terrain against plane surface) against azimuth at different latitudes with different angled *** results clearly support the strong screening effect of rugged terrain through out the country especially in Himalayas,Karakoram and Hindukush (HKH),western border mountains and Balochistan *** model can be instrumental as baseline geospatial information for scientific investigations in Pakistan,where substantial fraction of national population is living in mountainous regions.

关键词： Pakistan distributed modeling ESR DEM GIS rugged terrain

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distributed modeling of the beginning and ending dates and durations of limited temperatures over the rugged terrain of Chongqing

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Progress in Natural Science:Materials International 2009年第12期19卷 1739-1746页

作者： Xinfa Qiu~a,Guoping Shi~a,Yan Zeng~(b,*),Zongya Bian~a,Jingmei Wei~c a Department of GIS,School of Remote Sensing,Nanjing University of Information Science & Technology,Nanjing 210044,China b Jiangsu Institute of Meteorological Sciences,Nanjing 210008,China c Jinling College,Nanjing University,Nanjing 210089,China Department of GIS School of Remote Sensing Nanjing University of Information Science & Technology Nanjing 210044 China Jiangsu Institute of Meteorological Sciences Nanjing 210008 China Jinling College Nanjing University Nanjing 210089 China

A physically based empirical model was established for the beginning and ending dates(BED) of limited *** used were daily mean temperatures from 34 conventional stations in the Chongqing region,measured from 1961 to *** this model in combination with the distributed modeling results of monthly mean temperatures,we developed a method for creating a distributed simulation of the BED and durations of limited temperatures in the rugged terrain of *** distribution maps were generated at a resolution of 100×100 m for the BED and durations of the limited temperatures of 0,10,15 and *** suggest that the distributed model is able to successfully reveal the macroscopic trends and local *** the modeled BED,the mean absolute bias error is 0.6-2.4 d. Cross-validation and case-year tests show mean absolute bias errors of 1.3-2.8 d and 0.7-2.5 d,*** shows that the simulation results are consistent with the field *** implies that the simulations are as good as observations,thus providing a viable technique for simulating mountainous heat resources using conventional meteorological data.

关键词： distributed modeling Chongqing Limited temperature Beginning and ending date

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