A modeling approach reveals differences in evapotranspiration and its partitioning in two semiarid ecosystems in Northwest Mexico

Luis A. Méndez-Barroso, Enrique Vivoni, Agustin Robles-Morua, Giuseppe Mascaro, Enrico A. Yépez, Julio C. Rodríguez, Christopher J. Watts, Jaime Garatuza-Payán, Juan A. Saíz-Hernández

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Seasonal vegetation changes during the North American monsoon play a major role in modifying water, energy, and momentum fluxes. Nevertheless, most models parameterize plants as a static component or with averaged seasonal variations that ignore interannual differences and their potential impact on evapotranspiration (ET) and its components. Here vegetation parameters derived from remote sensing data were coupled with a hydrologic model at two eddy covariance (EC) sites with observations spanning multiple summers. Sinaloan thornscrub (ST) and Madrean woodland (MW) sites, arranged at intermediate and high elevations along mountain fronts in northwest Mexico, occupy specific niches related to climate conditions and water availability that are poorly understood. We found that simulations with a dynamic representation of vegetation greening tracked well the seasonal evolution of observed ET and soil moisture (SM). A switch in the dominant component of ET from soil evaporation (E) to plant transpiration (T) was observed for each ecosystem depending on the timing and magnitude of vegetation greening that is directly tied to rainfall characteristics. Differences in vegetation greening at the ST and MW sites lead to a dominance of transpiration at ST (T/ET = 57%), but evaporation-dominant conditions at MW (T/ET = 19%). Peak transpiration occurred at 5 and 20 days after the full canopy development in the ST and MW sites, respectively. These results indicate that evapotranspiration timing and partitioning varies considerably in the two studied ecosystems in accordance with different modes of vegetation greening. Intermediate-elevation ecosystems follow an intensive water use strategy with a rapid and robust transpiration response to water availability. In contrast, higher elevation sites have delayed and attenuated transpiration, suggesting an extensive water use strategy persisting beyond the North American monsoon.

Original languageEnglish (US)
Pages (from-to)3229-3252
Number of pages24
JournalWater Resources Research
Volume50
Issue number4
DOIs
StatePublished - 2014

Fingerprint

evapotranspiration
partitioning
transpiration
ecosystem
vegetation
woodland
modeling
water availability
water use
monsoon
evaporation
eddy covariance
climate conditions
niche
momentum
seasonal variation
soil moisture
canopy
remote sensing
rainfall

Keywords

  • ecohydrology
  • North American monsoon
  • remote sensing
  • semiarid forests
  • soil moisture
  • vegetation greening

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

A modeling approach reveals differences in evapotranspiration and its partitioning in two semiarid ecosystems in Northwest Mexico. / Méndez-Barroso, Luis A.; Vivoni, Enrique; Robles-Morua, Agustin; Mascaro, Giuseppe; Yépez, Enrico A.; Rodríguez, Julio C.; Watts, Christopher J.; Garatuza-Payán, Jaime; Saíz-Hernández, Juan A.

In: Water Resources Research, Vol. 50, No. 4, 2014, p. 3229-3252.

Research output: Contribution to journalArticle

Méndez-Barroso, LA, Vivoni, E, Robles-Morua, A, Mascaro, G, Yépez, EA, Rodríguez, JC, Watts, CJ, Garatuza-Payán, J & Saíz-Hernández, JA 2014, 'A modeling approach reveals differences in evapotranspiration and its partitioning in two semiarid ecosystems in Northwest Mexico', Water Resources Research, vol. 50, no. 4, pp. 3229-3252. https://doi.org/10.1002/2013WR014838
Méndez-Barroso, Luis A. ; Vivoni, Enrique ; Robles-Morua, Agustin ; Mascaro, Giuseppe ; Yépez, Enrico A. ; Rodríguez, Julio C. ; Watts, Christopher J. ; Garatuza-Payán, Jaime ; Saíz-Hernández, Juan A. / A modeling approach reveals differences in evapotranspiration and its partitioning in two semiarid ecosystems in Northwest Mexico. In: Water Resources Research. 2014 ; Vol. 50, No. 4. pp. 3229-3252.
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AU - Méndez-Barroso, Luis A.

AU - Vivoni, Enrique

AU - Robles-Morua, Agustin

AU - Mascaro, Giuseppe

AU - Yépez, Enrico A.

AU - Rodríguez, Julio C.

AU - Watts, Christopher J.

AU - Garatuza-Payán, Jaime

AU - Saíz-Hernández, Juan A.

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AB - Seasonal vegetation changes during the North American monsoon play a major role in modifying water, energy, and momentum fluxes. Nevertheless, most models parameterize plants as a static component or with averaged seasonal variations that ignore interannual differences and their potential impact on evapotranspiration (ET) and its components. Here vegetation parameters derived from remote sensing data were coupled with a hydrologic model at two eddy covariance (EC) sites with observations spanning multiple summers. Sinaloan thornscrub (ST) and Madrean woodland (MW) sites, arranged at intermediate and high elevations along mountain fronts in northwest Mexico, occupy specific niches related to climate conditions and water availability that are poorly understood. We found that simulations with a dynamic representation of vegetation greening tracked well the seasonal evolution of observed ET and soil moisture (SM). A switch in the dominant component of ET from soil evaporation (E) to plant transpiration (T) was observed for each ecosystem depending on the timing and magnitude of vegetation greening that is directly tied to rainfall characteristics. Differences in vegetation greening at the ST and MW sites lead to a dominance of transpiration at ST (T/ET = 57%), but evaporation-dominant conditions at MW (T/ET = 19%). Peak transpiration occurred at 5 and 20 days after the full canopy development in the ST and MW sites, respectively. These results indicate that evapotranspiration timing and partitioning varies considerably in the two studied ecosystems in accordance with different modes of vegetation greening. Intermediate-elevation ecosystems follow an intensive water use strategy with a rapid and robust transpiration response to water availability. In contrast, higher elevation sites have delayed and attenuated transpiration, suggesting an extensive water use strategy persisting beyond the North American monsoon.

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