Article
Environmental Sciences
Qiong Su, Vijay P. Singh
Summary: The Priestley-Taylor (PT) method is commonly used to calculate reference evapotranspiration (ETo) in hydrologic and crop models, but its default coefficient may not be reliable across different climatic regions. This study derived an analytical expression of PT coefficient (PTa) using the Penman-Monteith method, which improved the accuracy of ETo estimation. The global monthly PTa dataset is open-source and can be incorporated into models. The study also found that radiative component was the main driver of global ETo changes, and the impact of available energy and wind speed on ETo variations intensified in a warming climate.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Fernando Onate-Valdivieso, Arianna Onate-Paladines, Deiber Nunez
Summary: This study analyzed the capabilities of four satellite sensors with different spatial and temporal resolutions (LANDSAT 8, ASTER, MODIS and SENTINEL 3) in calculating the reference crop evapotranspiration (ETo) using images and products obtained. The FAO Penman-Monteith equation was used in both traditional and remote sensing approaches to estimate ETo values. The accuracy of the satellite products was evaluated through cross-validation, comparing them with values obtained from meteorological stations. The study found that spatial resolution had a direct correlation with the accuracy of ETo estimates, with LANDSAT 8 products being the most accurate. However, SENTINEL 3 was preferred for continuous ETo monitoring.
Article
Multidisciplinary Sciences
Deniz Levent Koc
Summary: Reference evapotranspiration (ETo) is crucial for irrigation practices and water resources management. The FAO-56 Penman-Monteith (PM) equation is the most accurate method to calculate ETo, but it requires multiple meteorological variables, limiting its applicability in regions with poor meteorological observations. Many empirical equations, including the FAO-24 Pan method, have been developed to estimate ETo. In this study, the performance of eight K-pan models was evaluated in Adana, Turkey, with the Wahed & Snyder model showing the best performance at the seasonal and monthly scales.
Article
Engineering, Civil
Milan Gocic, Mohammad Arab Amiri
Summary: The study examined the impact of using the optimum set of time lags on the prediction accuracy of monthly ET0 using artificial neural network, showing that more time lags lead to more efficient monthly ET0 prediction.
WATER RESOURCES MANAGEMENT
(2021)
Article
Environmental Sciences
Luiz Claudio Valle Junior, George Vourlitis, Leone Francisco Curado, Rafael Palacios, Jose Nogueira, Francisco Lobo, Abu Reza Md Towfiqul Islam, Thiago Rodrigues
Summary: In the study, it was found that wind speed and actual vapor pressure have less impact on ETo estimation in the Cerrado region, while temperature and radiation data are more crucial. Radiation data were identified to have the highest impact on ETo estimates in the study area, and FAO procedures for estimating radiation may not be suitable when radiation data are missing.
Article
Meteorology & Atmospheric Sciences
Mohamed Tarek Sobh, Mohamed Salem Nashwan, Nabil Amer
Summary: Accurate estimation of evapotranspiration is crucial in arid regions like Egypt. This study compares and evaluates the performance of various empirical equations and artificial intelligence models in estimating reference evapotranspiration. The results show that equations based on radiation and the random forest model outperform others in replicating the reference estimates.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Computer Science, Information Systems
Stavroula Dimitriadou, Konstantinos G. Nikolakopoulos
Summary: This study develops ArcMap models to implement three methods for investigating the variability in daily mean reference evapotranspiration over Peloponnese, Greece. The models show sensitivity to different climate parameters and depict interactions among them. The GIS models are accurate, reliable, time-saving, and adjustable to any study area, providing valuable insights into evapotranspiration estimation.
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
(2021)
Article
Meteorology & Atmospheric Sciences
J. Ramachandran, R. Lalitha, S. Vallal Kannan, K. Sivasubramanian
Summary: The performance of sixteen Valiantzas' reference evapotranspiration models was tested using meteorological data from a semi-arid region in Tamil Nadu, India. The models were compared with the FAO56 Penman-Monteith method, and metrics such as coefficient of determination, standard error estimate, and long-term average ratio were used for evaluation. The investigation found that Valiantzas' models requiring complete dataset performed well, while those not requiring wind speed data also showed good correlation with the FAO56-PM method. Formulae accounting for local average wind conditions, temperature and relative humidity data alone, as well as temperature and radiation data alone also performed well. Overall, the study demonstrated the accuracy of Valiantzas' models and their usefulness in situations with incomplete datasets.
Article
Environmental Sciences
Apolinario Lujano, Miguel Sanchez-Delgado, Efrain Lujano
Summary: The objective of this study is to improve the Hargreaves-Samani (HS) reference evapotranspiration estimates in the Peruvian Altiplano (PA) by calibrating the radiation coefficient K-RS. The results show that the modified HS (HSM) equation with calibrated K-RS values provides more accurate estimates of evapotranspiration in the PA. The study also demonstrates the use of a multiple linear regression (MLR) model to regionalize the K-RS for the PA.
Article
Green & Sustainable Science & Technology
Goncalo C. Rodrigues, Ricardo P. Braga
Summary: The study evaluated two methods for estimating ETo and found that acceptable estimations can be achieved by calibrating a radiation adjustment coefficient and using a MaxTET procedure based solely on maximum temperature. Both methods were shown to be accurate ETo estimators when weather data are scarce.
Article
Agronomy
Goncalo C. Rodrigues, Ricardo P. Braga
Summary: The study evaluated nine methods for estimating reference evapotranspiration at 14 locations in southern Portugal, showing that locally adjusted Hargreaves-Samani method and modified Hargreaves-Samani method can accurately estimate daily ETo in most locations.
Article
Green & Sustainable Science & Technology
Soo-Jin Kim, Seung-Jong Bae, Min-Won Jang
Summary: A linear regression machine learning model based on temperature data was developed to estimate reference evapotranspiration in South Korea. Compared to temperature-based empirical equations, the proposed model achieved higher accuracy and lower error when using all meteorological data.
Article
Agronomy
Ho-Jun Kim, Sewwandhi Chandrasekara, Hyun-Han Kwon, Carlos Lima, Tae-woong Kim
Summary: The main focus of this study is to develop a multi-scale surrogate model for estimating evapotranspiration (ETo) using only temperature as input. A Bayesian approach is adopted to estimate the parameters of the Hargreaves-Samani equation, which can vary across space. The proposed model provides more accurate estimations of ETo at daily, monthly, and annual scales compared to the traditional model.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Geosciences, Multidisciplinary
Yizhe Li, Huiliang Wang, Xin Zhang, Chenhao Li, Zihao Tian, Qiufen Zhang, Xizhi Lv, Tianling Qin
Summary: This study aims to explore the relationships between meteorological factors and reference evapotranspiration (ET0). Based on meteorological data from 26 stations in the Yiluo River Basin and its surrounding areas from 1958 to 2020, the temporal and spatial variations and driving factors of ET0 are investigated. The results show that spatially, annual ET0 decreases from northeast to southwest in the Yiluo River Basin. Temporally, there is a fluctuating decreasing trend rather than a monotonic decreasing trend for annual ET0 during the entire period. The study concludes that relative humidity is the most sensitive factor, while wind speed contributes the most to the variations in ET0 and is closely related to the rates of relative change of meteorological factors.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
Andrzej Arazny, Malgorzata Kepinska-Kasprzak, Edward Zbigniew Laszyca, Joanna Chmist-Sikorska, Arkadiusz Bartczak
Summary: The article analyzes the changes in reference evapotranspiration (ETo) in the growing season in Poland from 1966 to 2020. The results show a significant upward trend in ETo, with the average increase of 16.4 mm/10 years. The spatial distribution of ETo varies across the country, with lower values in northern Poland and higher values in the central lowlands. The highest monthly ETo values occur in June and July.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2023)
Article
Green & Sustainable Science & Technology
George Pavlidis, Alexandra Solomou, Spyridoula Stamouli, Vassilis Papavassiliou, Kosmas Kritsis, Chairi Kiourt, Vasileios Sevetlidis, George Karetsos, Panayiotis Trigas, Konstantinos Kougioumoutzis, Katerina Goula, Nikolaos Proutsos, George Pistikos, Yannis Theodoridis, Emmanouil Galanopoulos, Nikolaos Paraskevas, Ursula Foskolou, Michael Papadopoulos
Summary: This article introduces the concept of ecotourism and the thriving global ecotourism industry. It focuses on the AdVENt project, which seeks to promote sustainable ecotourism through natural science and technological innovation. The study area of the project is the National Parks of Oiti and Parnassus in Central Greece.
Article
Agronomy
Alexandra D. Solomou, Rafaelia Germani, Nikolaos Proutsos, Michaela Petropoulou, Petros Koutroumpilas, Christos Galanis, Georgios Maroulis, Antonios Kolimenakis
Summary: This study investigates the use of phytoremediation, specifically focusing on Mediterranean plants, to reduce heavy metal concentrations in contaminated soils. Based on a review of 166 research studies, the findings suggest that phytoremediation is a sustainable and affordable option, particularly for developing countries. While non-native plant species may be preferred for their metal tolerance mechanisms, they can also pose risks to local ecosystems and should be carefully considered.
Article
Environmental Sciences
Nikolaos D. Proutsos, Aristotle Liakatas, Stavros G. Alexandris, Ioannis X. Tsiros, Dimitris Tigkas, George Halivopoulos
Summary: This study analyzed radiation data from a forest site in Greece from 2009 to 2014 to examine the impact of meteorological variables on the ratio of photosynthetically active to global solar radiation. The results showed that the atmospheric water content and clearness were the most influential factors in determining the composition of global solar radiation in the wavelengths of PAR. Temperature and other meteorological attributes had a minor effect on the ratio.
Article
Environmental Studies
Antonios Kolimenakis, Alexandra D. Solomou, Nikolaos Proutsos, Evangelia V. Avramidou, Evangelia Korakaki, Georgios Karetsos, Aimilia B. Kontogianni, Konstantinos Kontos, Christos Georgiadis, Georgios Maroulis, Eleftherios Papagiannis, Konstantinos Lagouvardos, Konstantinia Tsagkari
Summary: This study examines citizens' perceptions of the role of urban green areas in Greece during the era of COVID-19. The findings highlight that urban green areas are considered important for improving public health, and citizens are willing to pay more taxes for better services.
Article
Environmental Studies
Nikolaos D. Proutsos, Alexandra D. Solomou, Michaela Petropoulou, Nikolaos E. Chatzipavlis
Summary: Urban green spaces play a vital role in mitigating urban heat islands by influencing surface temperatures and reflectance through vegetation types and optical properties. Different elements of urban green spaces show distinct differences in surface temperature and albedo. Tree shades, dry bare soil, and concrete surfaces exhibit higher surface temperatures compared to grass-covered areas.
Article
Environmental Sciences
Samuel Chukwujindu Nwokolo, Nikolaos Proutsos, Edson L. Meyer, Chinedu Christian Ahia
Summary: This study used hybrid physics-based models to evaluate the effects of climate change and urban expansion on ecosystem productivity in China and India. The results showed that if global warming is limited to 1.5 degrees Celsius, the photosynthetically active radiation in both countries is projected to increase. Urban expansion had a greater impact than climate change in both countries, but the impact of climate change was greater in India than in China.
Article
Water Resources
Athanassios Bourletsikas, Nikolaos Proutsos, Panagiotis Michopoulos, Ioannis Argyrokastritis
Summary: In this study, the inter- and intra-annual changes in soil moisture and temperature profiles were investigated in a mixed Mediterranean maquis forest. The results showed that air temperature significantly influenced the upper soil layer, with an increase in winter and decrease in summer. Precipitation was identified as the main factor driving soil moisture variations up to a depth of 40 cm.
Article
Environmental Sciences
Nikolaos Proutsos, Dimitris Tigkas, Irida Tsevreni, Stavros G. Alexandris, Alexandra D. Solomou, Athanassios Bourletsikas, Stefanos Stefanidis, Samuel Chukwujindu Nwokolo
Summary: In this study, various empirical methods for potential evapotranspiration estimation were evaluated in Mediterranean urban green sites in Greece. The radiation-based methods and adjusted models performed better compared to temperature-based and mass transfer methods. Combination methods that require more data obtained the highest ranking scores.
Review
Environmental Sciences
Panagiotis P. Koulelis, Nikolaos Proutsos, Alexandra D. Solomou, Evangelia V. Avramidou, Ermioni Malliarou, Miltiadis Athanasiou, Gavriil Xanthopoulos, Panos V. Petrakis
Summary: This study reviews the impacts of climate change on Greek forests by analysing factors such as climate trends, forest management, biodiversity, genetics, insects, and wildfires, using data from the Scopus and Mendeley databases and official reports. By utilising our current understanding and allocating necessary efforts and resources, we actively address climate change consequences on forests. This study focuses on climate change and extreme weather outcomes on forests.
Review
Meteorology & Atmospheric Sciences
Irida Tsevreni, Nikolaos Proutsos, Magdalini Tsevreni, Dimitris Tigkas
Summary: This research aims to analyze the eco-anxiety and climate anxiety aspects of Generation Z based on a critical review of studies on children's and young people's ecological feelings worldwide and actual data on natural disasters per country since 2000. The research results reveal that (a) Generation Z worries in the Global North and suffers in the Global South, (b) Generation Z acts against climate change, and (c) there is an existential dimension of children's and young people's eco-anxiety. The study also highlights under-researched dimensions of eco-anxiety that are important to explore in the future. Empathizing with Generation Z's emotional state in relation to ecological crisis and climate change may influence and promote new directions in environmental thought and awareness.
Article
Water Resources
Stefanos Stefanidis, Dimitra Rossiou, Nikolaos Proutsos
Summary: This study investigated long-term drought characteristics in a Mediterranean oak forest ecosystem using the SPEI at various time scales and seasons. The results showed positive trends towards wetter conditions across all seasons and time scales, with shorter time scales better for identifying short-term droughts and longer time scales better for identifying less frequent but longer-lasting drought episodes. The findings contribute to a better understanding of drought dynamics in Mediterranean oak forests and have important implications for forest management and climate change adaptation planning.
Article
Agronomy
Sofia Gounari, Nikolaos Proutsos, Georgios Goras
Summary: The productivity of bees is significantly affected by weather conditions, with temperature and water-related parameters having a significant impact on beehive productivity.
ITALIAN JOURNAL OF AGROMETEOROLOGY-RIVISTA ITALIANA DI AGROMETEOROLOGIA
(2022)
Article
Water Resources
Dimitris Tigkas, Harris Vangelis, Nikolaos Proutsos, George Tsakiris
Summary: This paper presents the incorporation of two new drought indices for agricultural drought identification in DrinC software. The design principles and proper use of the indices are discussed. This enhancement improves the software's applicability for timely agricultural drought characterization and analysis.
