When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration?
Abstract Increasing vapor pressure deficit (VPD) increases atmospheric demand for water. While increased evapotranspiration (ET) in response to increased atmospheric demand seems intuitive, plants are capable of reducing ET in response to increased VPD by closing their stomata. We examine which effe...
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ftdoajarticles:oai:doaj.org/article:7f0617b994b04316988bf5e6c110e2f2 2023-05-15T15:10:26+02:00 When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration? Adam Massmann Pierre Gentine Changjie Lin 2019-10-01T00:00:00Z https://doi.org/10.1029/2019MS001790 https://doaj.org/article/7f0617b994b04316988bf5e6c110e2f2 EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2019MS001790 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2019MS001790 https://doaj.org/article/7f0617b994b04316988bf5e6c110e2f2 Journal of Advances in Modeling Earth Systems, Vol 11, Iss 10, Pp 3305-3320 (2019) evapotranspiration vapor pressure deficit ecohydrology stomatal conductance ecosystem modeling land‐atmosphere interaction Physical geography GB3-5030 Oceanography GC1-1581 article 2019 ftdoajarticles https://doi.org/10.1029/2019MS001790 2022-12-31T00:33:48Z Abstract Increasing vapor pressure deficit (VPD) increases atmospheric demand for water. While increased evapotranspiration (ET) in response to increased atmospheric demand seems intuitive, plants are capable of reducing ET in response to increased VPD by closing their stomata. We examine which effect dominates the response to increasing VPD: atmospheric demand and increases in ET or plant response (stomata closure) and decreases in ET. We use Penman‐Monteith, combined with semiempirical optimal stomatal regulation theory and underlying water use efficiency, to develop a theoretical framework for assessing ET response to VPD. The theory suggests that depending on the environment and plant characteristics, ET response to increasing VPD can vary from strongly decreasing to increasing, highlighting the diversity of plant water regulation strategies. The ET response varies due to (1) climate, with tropical and temperate climates more likely to exhibit a positive ET response to increasing VPD than boreal and arctic climates; (2) photosynthesis strategy, with C3 plants more likely to exhibit a positive ET response than C4 plants; and (3) plant type, with crops more likely to exhibit a positive ET response, and shrubs and gymniosperm trees more likely to exhibit a negative ET response. These results, derived from previous literature connecting plant parameters to plant and climate characteristics, highlight the utility of our simplified framework for understanding complex land‐atmosphere systems in terms of idealized scenarios in which ET responds to VPD only. This response is otherwise challenging to assess in an environment where many processes coevolve together. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Journal of Advances in Modeling Earth Systems 11 10 3305 3320 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
evapotranspiration vapor pressure deficit ecohydrology stomatal conductance ecosystem modeling land‐atmosphere interaction Physical geography GB3-5030 Oceanography GC1-1581 |
spellingShingle |
evapotranspiration vapor pressure deficit ecohydrology stomatal conductance ecosystem modeling land‐atmosphere interaction Physical geography GB3-5030 Oceanography GC1-1581 Adam Massmann Pierre Gentine Changjie Lin When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration? |
topic_facet |
evapotranspiration vapor pressure deficit ecohydrology stomatal conductance ecosystem modeling land‐atmosphere interaction Physical geography GB3-5030 Oceanography GC1-1581 |
description |
Abstract Increasing vapor pressure deficit (VPD) increases atmospheric demand for water. While increased evapotranspiration (ET) in response to increased atmospheric demand seems intuitive, plants are capable of reducing ET in response to increased VPD by closing their stomata. We examine which effect dominates the response to increasing VPD: atmospheric demand and increases in ET or plant response (stomata closure) and decreases in ET. We use Penman‐Monteith, combined with semiempirical optimal stomatal regulation theory and underlying water use efficiency, to develop a theoretical framework for assessing ET response to VPD. The theory suggests that depending on the environment and plant characteristics, ET response to increasing VPD can vary from strongly decreasing to increasing, highlighting the diversity of plant water regulation strategies. The ET response varies due to (1) climate, with tropical and temperate climates more likely to exhibit a positive ET response to increasing VPD than boreal and arctic climates; (2) photosynthesis strategy, with C3 plants more likely to exhibit a positive ET response than C4 plants; and (3) plant type, with crops more likely to exhibit a positive ET response, and shrubs and gymniosperm trees more likely to exhibit a negative ET response. These results, derived from previous literature connecting plant parameters to plant and climate characteristics, highlight the utility of our simplified framework for understanding complex land‐atmosphere systems in terms of idealized scenarios in which ET responds to VPD only. This response is otherwise challenging to assess in an environment where many processes coevolve together. |
format |
Article in Journal/Newspaper |
author |
Adam Massmann Pierre Gentine Changjie Lin |
author_facet |
Adam Massmann Pierre Gentine Changjie Lin |
author_sort |
Adam Massmann |
title |
When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration? |
title_short |
When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration? |
title_full |
When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration? |
title_fullStr |
When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration? |
title_full_unstemmed |
When Does Vapor Pressure Deficit Drive or Reduce Evapotranspiration? |
title_sort |
when does vapor pressure deficit drive or reduce evapotranspiration? |
publisher |
American Geophysical Union (AGU) |
publishDate |
2019 |
url |
https://doi.org/10.1029/2019MS001790 https://doaj.org/article/7f0617b994b04316988bf5e6c110e2f2 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Journal of Advances in Modeling Earth Systems, Vol 11, Iss 10, Pp 3305-3320 (2019) |
op_relation |
https://doi.org/10.1029/2019MS001790 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2019MS001790 https://doaj.org/article/7f0617b994b04316988bf5e6c110e2f2 |
op_doi |
https://doi.org/10.1029/2019MS001790 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
11 |
container_issue |
10 |
container_start_page |
3305 |
op_container_end_page |
3320 |
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1766341463912742912 |