Summer evapotranspiration in western Siberia: a comparison between eddy covariance and Penman method formulations

Abstract Evapotranspiration is difficult to quantify because of the many factors and complex processes that influence it. Several empirical methods have been developed over the years to estimate potential evapotranspiration based on easily available parameters. Directly measured data of actual evapo...

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Published in:Hydrological Processes
Main Authors: Fleischer, Elisa, Bölter, Jana, Klemm, Otto
Other Authors: German Federal Ministry of Education and Research
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2015
Subjects:
Online Access:http://dx.doi.org/10.1002/hyp.10517
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spelling crwiley:10.1002/hyp.10517 2024-06-23T07:57:08+00:00 Summer evapotranspiration in western Siberia: a comparison between eddy covariance and Penman method formulations Fleischer, Elisa Bölter, Jana Klemm, Otto German Federal Ministry of Education and Research 2015 http://dx.doi.org/10.1002/hyp.10517 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fhyp.10517 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.10517 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Hydrological Processes volume 29, issue 20, page 4498-4513 ISSN 0885-6087 1099-1085 journal-article 2015 crwiley https://doi.org/10.1002/hyp.10517 2024-06-11T04:38:12Z Abstract Evapotranspiration is difficult to quantify because of the many factors and complex processes that influence it. Several empirical methods have been developed over the years to estimate potential evapotranspiration based on easily available parameters. Directly measured data of actual evapotranspiration have been rather sparse in the past and still need to be improved in particular regions like western Siberia. The transition zone between the warm temperate and cold temperate continental climates is very sensitive to climate change, and water stress is an increasingly important issue in these regions with a highly dynamic agricultural activity. So there is a growing need to estimate actual evapotranspiration. Widely usable approximations are needed. In this study, the values of potential evapotranspiration computed with the original version, and eight modifications of the Penman formulation were compared and related to the actual evapotranspiration measured by eddy covariance over a grassland area in western Siberia. The original 1948 and 1963 Penman formulations are best for estimating potential evapotranspiration in the transition zone between the forest steppes and the pre‐taiga. A nearly linear relationship between the potential and actual evapotranspiration was found. A simple modification of the Penman equation (i.e. the multiplication of the result by a factor of 0.47) is suggested for approximating the actual evapotranspiration based on standard meteorological data for the region. The original Penman formulation is most robust and will provide the widest applicability in the future under changing climate and environmental conditions. In this context, it is further recommended not to neglect the ventilation term of the Penman equation, which is often assumed to be negligibly small. A detailed correlation analysis showed that under dry soil conditions, the vegetation largely contributed to the actual evapotranspiration and, in contrast to widely held expectations, that the Penman equation is best ... Article in Journal/Newspaper taiga Siberia Wiley Online Library Hydrological Processes 29 20 4498 4513
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collection Wiley Online Library
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language English
description Abstract Evapotranspiration is difficult to quantify because of the many factors and complex processes that influence it. Several empirical methods have been developed over the years to estimate potential evapotranspiration based on easily available parameters. Directly measured data of actual evapotranspiration have been rather sparse in the past and still need to be improved in particular regions like western Siberia. The transition zone between the warm temperate and cold temperate continental climates is very sensitive to climate change, and water stress is an increasingly important issue in these regions with a highly dynamic agricultural activity. So there is a growing need to estimate actual evapotranspiration. Widely usable approximations are needed. In this study, the values of potential evapotranspiration computed with the original version, and eight modifications of the Penman formulation were compared and related to the actual evapotranspiration measured by eddy covariance over a grassland area in western Siberia. The original 1948 and 1963 Penman formulations are best for estimating potential evapotranspiration in the transition zone between the forest steppes and the pre‐taiga. A nearly linear relationship between the potential and actual evapotranspiration was found. A simple modification of the Penman equation (i.e. the multiplication of the result by a factor of 0.47) is suggested for approximating the actual evapotranspiration based on standard meteorological data for the region. The original Penman formulation is most robust and will provide the widest applicability in the future under changing climate and environmental conditions. In this context, it is further recommended not to neglect the ventilation term of the Penman equation, which is often assumed to be negligibly small. A detailed correlation analysis showed that under dry soil conditions, the vegetation largely contributed to the actual evapotranspiration and, in contrast to widely held expectations, that the Penman equation is best ...
author2 German Federal Ministry of Education and Research
format Article in Journal/Newspaper
author Fleischer, Elisa
Bölter, Jana
Klemm, Otto
spellingShingle Fleischer, Elisa
Bölter, Jana
Klemm, Otto
Summer evapotranspiration in western Siberia: a comparison between eddy covariance and Penman method formulations
author_facet Fleischer, Elisa
Bölter, Jana
Klemm, Otto
author_sort Fleischer, Elisa
title Summer evapotranspiration in western Siberia: a comparison between eddy covariance and Penman method formulations
title_short Summer evapotranspiration in western Siberia: a comparison between eddy covariance and Penman method formulations
title_full Summer evapotranspiration in western Siberia: a comparison between eddy covariance and Penman method formulations
title_fullStr Summer evapotranspiration in western Siberia: a comparison between eddy covariance and Penman method formulations
title_full_unstemmed Summer evapotranspiration in western Siberia: a comparison between eddy covariance and Penman method formulations
title_sort summer evapotranspiration in western siberia: a comparison between eddy covariance and penman method formulations
publisher Wiley
publishDate 2015
url http://dx.doi.org/10.1002/hyp.10517
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fhyp.10517
https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.10517
genre taiga
Siberia
genre_facet taiga
Siberia
op_source Hydrological Processes
volume 29, issue 20, page 4498-4513
ISSN 0885-6087 1099-1085
op_rights http://onlinelibrary.wiley.com/termsAndConditions#vor
op_doi https://doi.org/10.1002/hyp.10517
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