Assessment of Different Complementary-Relationship-Based Models for Estimating Actual Terrestrial Evapotranspiration in the Frozen Ground Regions of the Qinghai-Tibet Plateau
Actual evapotranspiration (ET a ) is important since it is an important link to water, energy, and carbon cycles. Approximately 96% of the Qinghai-Tibet Plateau (QTP) is underlain by frozen ground, however, the ground observations of ET a are particularly sparse–which is especially true in the perma...
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ftdoajarticles:oai:doaj.org/article:a86150b15c2649b5b5bf5d6490c7ea57 2023-05-15T17:57:25+02:00 Assessment of Different Complementary-Relationship-Based Models for Estimating Actual Terrestrial Evapotranspiration in the Frozen Ground Regions of the Qinghai-Tibet Plateau Chengpeng Shang Tonghua Wu Ning Ma Jiemin Wang Xiangfei Li Xiaofan Zhu Tianye Wang Guojie Hu Ren Li Sizhong Yang Jie Chen Jimin Yao Cheng Yang 2022-04-01T00:00:00Z https://doi.org/10.3390/rs14092047 https://doaj.org/article/a86150b15c2649b5b5bf5d6490c7ea57 EN eng MDPI AG https://www.mdpi.com/2072-4292/14/9/2047 https://doaj.org/toc/2072-4292 doi:10.3390/rs14092047 2072-4292 https://doaj.org/article/a86150b15c2649b5b5bf5d6490c7ea57 Remote Sensing, Vol 14, Iss 2047, p 2047 (2022) actual evapotranspiration complementary relationship permafrost seasonally frozen ground Qinghai-Tibet Plateau Science Q article 2022 ftdoajarticles https://doi.org/10.3390/rs14092047 2022-12-30T22:37:50Z Actual evapotranspiration (ET a ) is important since it is an important link to water, energy, and carbon cycles. Approximately 96% of the Qinghai-Tibet Plateau (QTP) is underlain by frozen ground, however, the ground observations of ET a are particularly sparse–which is especially true in the permafrost regions–leading to great challenge for the accurate estimation of ET a . Due to the impacts of freeze-thaw cycles and permafrost degradation on the regional ET process, it is therefore urgent and important to find a reasonable approach for ET a estimation in the regions. The complementary relationship (CR) approach is a potential method since it needs only routine meteorological variables to estimate ET a . The CR approach, including the modified advection-aridity model by Kahler (K2006), polynomial generalized complementary function by Brutsaert (B2015) and its improved versions by Szilagyi (S2017) and Crago (C2018), and sigmoid generalized complementary function by Han (H2018) in the present study, were assessed against in situ measured ET a at four observation sites in the frozen ground regions. The results indicate that five CR-based models are generally capable of simulating variations in ET a , whether default and calibrated parameter values are employed during the warm season compared with those of the cold season. On a daily basis, the C2018 model performed better than other CR-based models, as indicated by the highest Nash-Sutcliffe efficiency (NSE) and lowest root mean square error (RMSE) values at each site. On a monthly basis, no model uniformly performed best in a specific month. On an annual basis, CR-based models estimating ET a with biases ranging from −94.2 to 28.3 mm year −1 , and the H2018 model overall performed best with the smallest bias within 15 mm year −1 . Parameter sensitivity analysis demonstrated the relatively small influence of each parameter varying within regular fluctuation magnitude on the accuracy of the corresponding model. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Nash ENVELOPE(-62.350,-62.350,-74.233,-74.233) Sutcliffe ENVELOPE(-81.383,-81.383,50.683,50.683) Remote Sensing 14 9 2047 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
actual evapotranspiration complementary relationship permafrost seasonally frozen ground Qinghai-Tibet Plateau Science Q |
spellingShingle |
actual evapotranspiration complementary relationship permafrost seasonally frozen ground Qinghai-Tibet Plateau Science Q Chengpeng Shang Tonghua Wu Ning Ma Jiemin Wang Xiangfei Li Xiaofan Zhu Tianye Wang Guojie Hu Ren Li Sizhong Yang Jie Chen Jimin Yao Cheng Yang Assessment of Different Complementary-Relationship-Based Models for Estimating Actual Terrestrial Evapotranspiration in the Frozen Ground Regions of the Qinghai-Tibet Plateau |
topic_facet |
actual evapotranspiration complementary relationship permafrost seasonally frozen ground Qinghai-Tibet Plateau Science Q |
description |
Actual evapotranspiration (ET a ) is important since it is an important link to water, energy, and carbon cycles. Approximately 96% of the Qinghai-Tibet Plateau (QTP) is underlain by frozen ground, however, the ground observations of ET a are particularly sparse–which is especially true in the permafrost regions–leading to great challenge for the accurate estimation of ET a . Due to the impacts of freeze-thaw cycles and permafrost degradation on the regional ET process, it is therefore urgent and important to find a reasonable approach for ET a estimation in the regions. The complementary relationship (CR) approach is a potential method since it needs only routine meteorological variables to estimate ET a . The CR approach, including the modified advection-aridity model by Kahler (K2006), polynomial generalized complementary function by Brutsaert (B2015) and its improved versions by Szilagyi (S2017) and Crago (C2018), and sigmoid generalized complementary function by Han (H2018) in the present study, were assessed against in situ measured ET a at four observation sites in the frozen ground regions. The results indicate that five CR-based models are generally capable of simulating variations in ET a , whether default and calibrated parameter values are employed during the warm season compared with those of the cold season. On a daily basis, the C2018 model performed better than other CR-based models, as indicated by the highest Nash-Sutcliffe efficiency (NSE) and lowest root mean square error (RMSE) values at each site. On a monthly basis, no model uniformly performed best in a specific month. On an annual basis, CR-based models estimating ET a with biases ranging from −94.2 to 28.3 mm year −1 , and the H2018 model overall performed best with the smallest bias within 15 mm year −1 . Parameter sensitivity analysis demonstrated the relatively small influence of each parameter varying within regular fluctuation magnitude on the accuracy of the corresponding model. |
format |
Article in Journal/Newspaper |
author |
Chengpeng Shang Tonghua Wu Ning Ma Jiemin Wang Xiangfei Li Xiaofan Zhu Tianye Wang Guojie Hu Ren Li Sizhong Yang Jie Chen Jimin Yao Cheng Yang |
author_facet |
Chengpeng Shang Tonghua Wu Ning Ma Jiemin Wang Xiangfei Li Xiaofan Zhu Tianye Wang Guojie Hu Ren Li Sizhong Yang Jie Chen Jimin Yao Cheng Yang |
author_sort |
Chengpeng Shang |
title |
Assessment of Different Complementary-Relationship-Based Models for Estimating Actual Terrestrial Evapotranspiration in the Frozen Ground Regions of the Qinghai-Tibet Plateau |
title_short |
Assessment of Different Complementary-Relationship-Based Models for Estimating Actual Terrestrial Evapotranspiration in the Frozen Ground Regions of the Qinghai-Tibet Plateau |
title_full |
Assessment of Different Complementary-Relationship-Based Models for Estimating Actual Terrestrial Evapotranspiration in the Frozen Ground Regions of the Qinghai-Tibet Plateau |
title_fullStr |
Assessment of Different Complementary-Relationship-Based Models for Estimating Actual Terrestrial Evapotranspiration in the Frozen Ground Regions of the Qinghai-Tibet Plateau |
title_full_unstemmed |
Assessment of Different Complementary-Relationship-Based Models for Estimating Actual Terrestrial Evapotranspiration in the Frozen Ground Regions of the Qinghai-Tibet Plateau |
title_sort |
assessment of different complementary-relationship-based models for estimating actual terrestrial evapotranspiration in the frozen ground regions of the qinghai-tibet plateau |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/rs14092047 https://doaj.org/article/a86150b15c2649b5b5bf5d6490c7ea57 |
long_lat |
ENVELOPE(-62.350,-62.350,-74.233,-74.233) ENVELOPE(-81.383,-81.383,50.683,50.683) |
geographic |
Nash Sutcliffe |
geographic_facet |
Nash Sutcliffe |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Remote Sensing, Vol 14, Iss 2047, p 2047 (2022) |
op_relation |
https://www.mdpi.com/2072-4292/14/9/2047 https://doaj.org/toc/2072-4292 doi:10.3390/rs14092047 2072-4292 https://doaj.org/article/a86150b15c2649b5b5bf5d6490c7ea57 |
op_doi |
https://doi.org/10.3390/rs14092047 |
container_title |
Remote Sensing |
container_volume |
14 |
container_issue |
9 |
container_start_page |
2047 |
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1766165848946376704 |