Improving Actual Evapotranspiration Estimation Integrating Energy Consumption for Ice Phase Change Across the Tibetan Plateau
Permafrost thawing over the Tibetan Plateau (TP) is a consequence of climatic warming, which will change local hydrological processes remarkably. Evapotranspiration (ET) is an important local hydrological process indicator that needs to be well quantified. Several methods have been applied to estima...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | http://ir.imde.ac.cn/handle/131551/34307 https://doi.org/10.1029/2019JD031799 |
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ftchinacadscimhe:oai:ir.imde.ac.cn:131551/34307 2023-05-15T16:37:08+02:00 Improving Actual Evapotranspiration Estimation Integrating Energy Consumption for Ice Phase Change Across the Tibetan Plateau Wang, Genxu Lin, Shan Hu, Zhaoyong Lu, Yaqiong Sun, Xiangyang Huang, Kewei 2020-02-16 http://ir.imde.ac.cn/handle/131551/34307 https://doi.org/10.1029/2019JD031799 英语 eng AMER GEOPHYSICAL UNION JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES http://ir.imde.ac.cn/handle/131551/34307 doi:10.1029/2019JD031799 COMPLEMENTARY PRINCIPLE WATER EVAPORATION TRENDS CARBON FUTURE CHINA FLUX Meteorology & Atmospheric Sciences 期刊论文 2020 ftchinacadscimhe https://doi.org/10.1029/2019JD031799 2022-12-19T18:23:12Z Permafrost thawing over the Tibetan Plateau (TP) is a consequence of climatic warming, which will change local hydrological processes remarkably. Evapotranspiration (ET) is an important local hydrological process indicator that needs to be well quantified. Several methods have been applied to estimate the ET. However, energy consumed by thawing was neglected in ET estimation on TP. Here a simple but effective method was introduced to represent the energy consumption due to ice phase changes in the generalized nonlinear complementary principle. Our method improved ET estimation by 4.60-106.67% in the nonlinear complementary model, validated at five eddy flux observation sites. With the new formulation, we analyzed the spatiotemporal patterns of ET and their driving factors during 1961-2014. The spatial averaged ET was 294.21 mm/year and decreased from southeast to northwest areas, cocontrolled by precipitation (P-re) and net radiation (R-n); dominated by the R-n in the warm-humid areas while by the P-re in the cold-dry areas. The temporal pattern of ET over the TP showed an increasing trend during 1961-2014, with a rate of 0.38 mm/year. The variations in air temperature (T-air) and R-n could explain 79.1% of the temporal variations in ET over the TP during the past 54 years, indicating atmosphere demand is the dominant factor on ET temporal variation. We also found that permafrost thawing accelerated the ET increases in the last 15 years over the transitional permafrost and seasonal permafrost areas, suggesting that degradation and ablation of permafrost under climatic changes will lead to accelerated ET. Report Ice permafrost IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) Journal of Geophysical Research: Atmospheres 125 3 |
institution |
Open Polar |
collection |
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) |
op_collection_id |
ftchinacadscimhe |
language |
English |
topic |
COMPLEMENTARY PRINCIPLE WATER EVAPORATION TRENDS CARBON FUTURE CHINA FLUX Meteorology & Atmospheric Sciences |
spellingShingle |
COMPLEMENTARY PRINCIPLE WATER EVAPORATION TRENDS CARBON FUTURE CHINA FLUX Meteorology & Atmospheric Sciences Wang, Genxu Lin, Shan Hu, Zhaoyong Lu, Yaqiong Sun, Xiangyang Huang, Kewei Improving Actual Evapotranspiration Estimation Integrating Energy Consumption for Ice Phase Change Across the Tibetan Plateau |
topic_facet |
COMPLEMENTARY PRINCIPLE WATER EVAPORATION TRENDS CARBON FUTURE CHINA FLUX Meteorology & Atmospheric Sciences |
description |
Permafrost thawing over the Tibetan Plateau (TP) is a consequence of climatic warming, which will change local hydrological processes remarkably. Evapotranspiration (ET) is an important local hydrological process indicator that needs to be well quantified. Several methods have been applied to estimate the ET. However, energy consumed by thawing was neglected in ET estimation on TP. Here a simple but effective method was introduced to represent the energy consumption due to ice phase changes in the generalized nonlinear complementary principle. Our method improved ET estimation by 4.60-106.67% in the nonlinear complementary model, validated at five eddy flux observation sites. With the new formulation, we analyzed the spatiotemporal patterns of ET and their driving factors during 1961-2014. The spatial averaged ET was 294.21 mm/year and decreased from southeast to northwest areas, cocontrolled by precipitation (P-re) and net radiation (R-n); dominated by the R-n in the warm-humid areas while by the P-re in the cold-dry areas. The temporal pattern of ET over the TP showed an increasing trend during 1961-2014, with a rate of 0.38 mm/year. The variations in air temperature (T-air) and R-n could explain 79.1% of the temporal variations in ET over the TP during the past 54 years, indicating atmosphere demand is the dominant factor on ET temporal variation. We also found that permafrost thawing accelerated the ET increases in the last 15 years over the transitional permafrost and seasonal permafrost areas, suggesting that degradation and ablation of permafrost under climatic changes will lead to accelerated ET. |
format |
Report |
author |
Wang, Genxu Lin, Shan Hu, Zhaoyong Lu, Yaqiong Sun, Xiangyang Huang, Kewei |
author_facet |
Wang, Genxu Lin, Shan Hu, Zhaoyong Lu, Yaqiong Sun, Xiangyang Huang, Kewei |
author_sort |
Wang, Genxu |
title |
Improving Actual Evapotranspiration Estimation Integrating Energy Consumption for Ice Phase Change Across the Tibetan Plateau |
title_short |
Improving Actual Evapotranspiration Estimation Integrating Energy Consumption for Ice Phase Change Across the Tibetan Plateau |
title_full |
Improving Actual Evapotranspiration Estimation Integrating Energy Consumption for Ice Phase Change Across the Tibetan Plateau |
title_fullStr |
Improving Actual Evapotranspiration Estimation Integrating Energy Consumption for Ice Phase Change Across the Tibetan Plateau |
title_full_unstemmed |
Improving Actual Evapotranspiration Estimation Integrating Energy Consumption for Ice Phase Change Across the Tibetan Plateau |
title_sort |
improving actual evapotranspiration estimation integrating energy consumption for ice phase change across the tibetan plateau |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2020 |
url |
http://ir.imde.ac.cn/handle/131551/34307 https://doi.org/10.1029/2019JD031799 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES http://ir.imde.ac.cn/handle/131551/34307 doi:10.1029/2019JD031799 |
op_doi |
https://doi.org/10.1029/2019JD031799 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
125 |
container_issue |
3 |
_version_ |
1766027437549813760 |