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Simplified Penman-Monteith Equation Determined by Temperature-Based global radiation Data and Its Multilocal Validation under Subhumid Climatic Conditions in Hungary

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Atmospheric and Climate Sciences 2023年第4期13卷 455-465页

作者： Zoltán Varga-Haszonits Éva Szalka Dávid Vasas Zsolt Giczi Pál Szakál Tamás Szakál Albert Casimir Faculty at Mosonmagyaróvár Széchenyi István University of Gy&#337r Gy&#337r Hungary

The extent to which specific climatic factors influence evapotranspiration under subhumid conditions in Hungary was investigated. The reference evapotranspiration, calculated with the internationally accepted Penman-Monteith equation proposed by FAO, was considered. The results show that the influence of radiation, which provides energy for evaporation, is the strongest factor and that the influence of global radiation alone is very strong. Taking into account that radiation was measured under rather limited conditions in space and time, global radiation was calculated using the Hargreaves method based on temperature. Accordingly, we have defined a formula based on temperature-based global radiation and verified the data obtained with the Penman-Monteith formula calculated for 14 meteorological stations. The verification gave good results, therefore the method can be used for practical purposes in the subhumid conditions of Hungary based on the data of the nearest meteorological station.

关键词： Effecting Factors Sensitivity Analysis global radiation Multilocal Validation Estimation Error

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Agricultural Luminous Energy Resource and Its Utilization in Fushun City

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Meteorological and Environmental Research 2010年第4期1卷 32-34,60页

作者：李金义银燕祝新宇迟贵富南京信息工程大学江苏南京210044 辽宁省气象局辽宁沈阳110001 辽宁省防雷中心辽宁沈阳110015 辽宁省抚顺市气象局辽宁抚顺113006

The solar global radiation from 1957 to 2006 was calculated in Fushun region and its seasonal,geographical and inter-annual variation were ***,relationship between yield and solar energy use efficiency of rice,corn and soybean were analyzed *** results showed that Fushun County had the most solar global radiation in Fushun region,while Xinbin County had the *** solar global radiation in warm season accounted for 72% of the total solar radiation in one *** maximum solar global radiation occurred in May,while theminimum value in December,with a period of 19 *** addition,crop yield was proportional to solar energy use efficiency.

关键词： Solar energy global radiation Planting structure Solar energy potential productivity China

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Determination of Reference Evapotranspiration Using Penman-Monteith Method in Case of Missing Wind Speed Data under Subhumid Climatic Condition in Hungary

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Atmospheric and Climate Sciences 2022年第2期12卷 235-245页

作者： Zoltán Varga-Haszonits Éva Szalka Tamás Szakál Department of Water and Environmental Sciences Széchenyi István University of Gy&#337 r Mosonmagyaróvár Hungary

The reference evapotranspiration was calculated using Penman-Monteith method proposed. This method was evaluated on data measured by lysimeter in Szarvas experimental station in Hungary. The results of the two methods were in good agreement. However, this method requires an amount of data which is not available at all sites of meteorological measurement. Therefore it was necessary to investigate which elements influencing evapotranspiration are important and which elements are less important. With the help of investigation was indicated that radiation and vapor pressure deficit play important role in determination of reference evapotranspiration. Taking into account this there was two possibilities to calculate evapotranspiration. One of these is to use Penman-Monteith formula with constant wind speed as advised by Allen. Another one is to neglect wind speed data. Both methods were investigated and the method with constant wind speed was found better in a subhumid climatic condition of Hungary.

关键词： Reference Evapotranspiration global radiation Vapor Pressure Deficit Sub Humid Climate Irrigation Requirements of Crops

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Analysis of solar radiation variations over Nanjing region in recent 40 years

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Journal of Geographical Sciences 2003年第1期13卷 97-104页

作者： ZHANG Yunlin,QIN Boqiang,CHEN Weimin(Nanjing Institute of Geography an d Limnology, CAS, Nanjing 210008, China) Nanjing Institute of Geography and Limnology CAS Nanjing China

The data utilized in this analysis consisted of extraterrestrial radiation, global radiation, d iffuse radiation, direct radiation, total cloud cover and relative suns hine. The annual variations and trend were analyzed for monthly mean daily total global, direct, and diffuse radiation on a horizontal surface and for the relations between global, direct, diffuse radiation and relative sunshine, tota l cloud cover. The climatological calculation equations of global and d irect radiation are put forward. The results show that global and dir ect radiations are characterized by decrease and diffuse radiation by increase. The main causes are due to the increase of concentration of suspended particles and atmospheric turbidities rather than cloud cover var iations.

关键词： Nanjing region global radiation direct radiation diffuse ra diation relative sunshine

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