Will Anthropogenic Warming Increase Evapotranspiration? Examining Irrigation Water Demand Implications of Climate Change in California
Abstract Climate modeling studies and observations do not fully agree on the implications of anthropogenic warming for evapotranspiration (ET), a major component of the water cycle and driver of irrigation water demand. Here, we use California as a testbed to assess the ET impacts of changing atmosp...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-01-01
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| Series: | Earth's Future |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2021EF002221 |
| _version_ | 1818176386052915200 |
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| author | P. Vahmani A. D. Jones D. Li |
| author_facet | P. Vahmani A. D. Jones D. Li |
| author_sort | P. Vahmani |
| collection | DOAJ |
| description | Abstract Climate modeling studies and observations do not fully agree on the implications of anthropogenic warming for evapotranspiration (ET), a major component of the water cycle and driver of irrigation water demand. Here, we use California as a testbed to assess the ET impacts of changing atmospheric conditions induced by climate change on irrigated systems. Our analysis of irrigated agricultural and urban regions shows that warmer atmospheric temperatures have minimal implications for ET rates and irrigation water demands—about one percent change per degree Celsius warming (∼1% °C−1). By explicitly modeling irrigation, we control for the confounding effect of climate‐driven soil moisture changes and directly estimate water demand implications. Our attribution analysis of the drivers of ET response to global anthropogenic warming shows that as the atmospheric temperature and vapor pressure deficit depart from the ideal conditions for transpiration, regulation of stomata resistance by stressed vegetation almost completely offsets the expected increase in ET rates that would otherwise result from abiotic processes alone. We further show that anthropogenic warming of the atmosphere has minimal implications for mean relative humidity (<1.7% °C−1) and the surface available energy (<0.2% °C−1), which are critical drivers of ET. This study corroborates the growing evidence that plant physiological changes moderate the degree to which changes in potential ET are realized as actual ET. |
| first_indexed | 2024-12-11T20:15:22Z |
| format | Article |
| id | doaj.art-9941b90f2e0b4916b910e48211a4ec09 |
| institution | Directory Open Access Journal |
| issn | 2328-4277 |
| language | English |
| last_indexed | 2024-12-11T20:15:22Z |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Earth's Future |
| spelling | doaj.art-9941b90f2e0b4916b910e48211a4ec092022-12-22T00:52:12ZengWileyEarth's Future2328-42772022-01-01101n/an/a10.1029/2021EF002221Will Anthropogenic Warming Increase Evapotranspiration? Examining Irrigation Water Demand Implications of Climate Change in CaliforniaP. Vahmani0A. D. Jones1D. Li2Lawrence Berkeley National Laboratory Berkeley CA USALawrence Berkeley National Laboratory Berkeley CA USADepartment of Earth and Environment Boston University Boston MA USAAbstract Climate modeling studies and observations do not fully agree on the implications of anthropogenic warming for evapotranspiration (ET), a major component of the water cycle and driver of irrigation water demand. Here, we use California as a testbed to assess the ET impacts of changing atmospheric conditions induced by climate change on irrigated systems. Our analysis of irrigated agricultural and urban regions shows that warmer atmospheric temperatures have minimal implications for ET rates and irrigation water demands—about one percent change per degree Celsius warming (∼1% °C−1). By explicitly modeling irrigation, we control for the confounding effect of climate‐driven soil moisture changes and directly estimate water demand implications. Our attribution analysis of the drivers of ET response to global anthropogenic warming shows that as the atmospheric temperature and vapor pressure deficit depart from the ideal conditions for transpiration, regulation of stomata resistance by stressed vegetation almost completely offsets the expected increase in ET rates that would otherwise result from abiotic processes alone. We further show that anthropogenic warming of the atmosphere has minimal implications for mean relative humidity (<1.7% °C−1) and the surface available energy (<0.2% °C−1), which are critical drivers of ET. This study corroborates the growing evidence that plant physiological changes moderate the degree to which changes in potential ET are realized as actual ET.https://doi.org/10.1029/2021EF002221evapotranspirationirrigation water demandclimate changeanthropogenic warmingvapor pressure deficiturban and agricultural areas |
| spellingShingle | P. Vahmani A. D. Jones D. Li Will Anthropogenic Warming Increase Evapotranspiration? Examining Irrigation Water Demand Implications of Climate Change in California Earth's Future evapotranspiration irrigation water demand climate change anthropogenic warming vapor pressure deficit urban and agricultural areas |
| title | Will Anthropogenic Warming Increase Evapotranspiration? Examining Irrigation Water Demand Implications of Climate Change in California |
| title_full | Will Anthropogenic Warming Increase Evapotranspiration? Examining Irrigation Water Demand Implications of Climate Change in California |
| title_fullStr | Will Anthropogenic Warming Increase Evapotranspiration? Examining Irrigation Water Demand Implications of Climate Change in California |
| title_full_unstemmed | Will Anthropogenic Warming Increase Evapotranspiration? Examining Irrigation Water Demand Implications of Climate Change in California |
| title_short | Will Anthropogenic Warming Increase Evapotranspiration? Examining Irrigation Water Demand Implications of Climate Change in California |
| title_sort | will anthropogenic warming increase evapotranspiration examining irrigation water demand implications of climate change in california |
| topic | evapotranspiration irrigation water demand climate change anthropogenic warming vapor pressure deficit urban and agricultural areas |
| url | https://doi.org/10.1029/2021EF002221 |
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