The land-atmosphere water flux in the tropics

Joshua B. Fisher, Yadvinder Malhi, Damien Bonal, Humberto R. Da Rocha, Alessandro C. De Araújo, Minoru Gamo, Michael L. Goulden, Takashi Hi Rano, Alfredo R. Huete, Hiroaki Kondo, Tomo'omi Kumagai, Henry W. Loescher, Scott Miller, Antonio D. Nobre, Yann Nouvellon, Steven F. Oberbauer, Samreong Panuthai, Olivier Roupsard, Scott Saleska, Katsunori TanakaNobuaki Tanaka, Kevin P. Tu, Celso Von Randow

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

Tropical vegetation is a major source of global land surface evapotranspiration, and can thus play a major role in global hydrological cycles and global atmospheric circulation. Accurate prediction of tropical evapotranspiration is critical to our understanding of these processes under changing climate. We examined the controls on evapotranspiration in tropical vegetation at 21 pan-tropical eddy covariance sites, conducted a comprehensive and systematic evaluation of 13 evapotranspiration models at these sites, and assessed the ability to scale up model estimates of evapotranspiration for the test region of Amazonia. Net radiation was the strongest determinant of evapotranspiration (mean evaporative fraction was 0.72) and explained 87% of the variance in monthly evapotranspiration across the sites. Vapor pressure deficit was the strongest residual predictor (14%), followed by normalized difference vegetation index (9%), precipitation (6%) and wind speed (4%). The radiation-based evapotranspiration models performed best overall for three reasons: (1) the vegetation was largely decoupled from atmospheric turbulent transfer (calculated from Ω decoupling factor), especially at the wetter sites; (2) the resistance-based models were hindered by difficulty in consistently characterizing canopy (and stomatal) resistance in the highly diverse vegetation; (3) the temperature-based models inadequately captured the variability in tropical evapotranspiration. We evaluated the potential to predict regional evapotranspiration for one test region: Amazonia. We estimated an Amazonia-wide evapotranspiration of 1370mmyr-1, but this value is dependent on assumptions about energy balance closure for the tropical eddy covariance sites; a lower value (1096mmyr-1) is considered in discussion on the use of flux data to validate and interpolate models.

Original languageEnglish (US)
Pages (from-to)2694-2714
Number of pages21
JournalGlobal Change Biology
Volume15
Issue number11
DOIs
StatePublished - Nov 2009

Fingerprint

Tropics
Evapotranspiration
evapotranspiration
Fluxes
Water
atmosphere
water
vegetation
eddy covariance
land
tropics
Radiation
Precipitation (meteorology)
net radiation
hydrological cycle
Energy balance
Vapor pressure
vapor pressure
atmospheric circulation
NDVI

Keywords

  • Amazon
  • Eddy covariance
  • Evaporation
  • Evapotranspiration
  • ISLSCP-II
  • LBA
  • Model
  • Remote sensing
  • Tropical

ASJC Scopus subject areas

  • Ecology
  • Global and Planetary Change
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Fisher, J. B., Malhi, Y., Bonal, D., Da Rocha, H. R., De Araújo, A. C., Gamo, M., ... Von Randow, C. (2009). The land-atmosphere water flux in the tropics. Global Change Biology, 15(11), 2694-2714. https://doi.org/10.1111/j.1365-2486.2008.01813.x

The land-atmosphere water flux in the tropics. / Fisher, Joshua B.; Malhi, Yadvinder; Bonal, Damien; Da Rocha, Humberto R.; De Araújo, Alessandro C.; Gamo, Minoru; Goulden, Michael L.; Rano, Takashi Hi; Huete, Alfredo R.; Kondo, Hiroaki; Kumagai, Tomo'omi; Loescher, Henry W.; Miller, Scott; Nobre, Antonio D.; Nouvellon, Yann; Oberbauer, Steven F.; Panuthai, Samreong; Roupsard, Olivier; Saleska, Scott; Tanaka, Katsunori; Tanaka, Nobuaki; Tu, Kevin P.; Von Randow, Celso.

In: Global Change Biology, Vol. 15, No. 11, 11.2009, p. 2694-2714.

Research output: Contribution to journalArticle

Fisher, JB, Malhi, Y, Bonal, D, Da Rocha, HR, De Araújo, AC, Gamo, M, Goulden, ML, Rano, TH, Huete, AR, Kondo, H, Kumagai, T, Loescher, HW, Miller, S, Nobre, AD, Nouvellon, Y, Oberbauer, SF, Panuthai, S, Roupsard, O, Saleska, S, Tanaka, K, Tanaka, N, Tu, KP & Von Randow, C 2009, 'The land-atmosphere water flux in the tropics', Global Change Biology, vol. 15, no. 11, pp. 2694-2714. https://doi.org/10.1111/j.1365-2486.2008.01813.x
Fisher JB, Malhi Y, Bonal D, Da Rocha HR, De Araújo AC, Gamo M et al. The land-atmosphere water flux in the tropics. Global Change Biology. 2009 Nov;15(11):2694-2714. https://doi.org/10.1111/j.1365-2486.2008.01813.x
Fisher, Joshua B. ; Malhi, Yadvinder ; Bonal, Damien ; Da Rocha, Humberto R. ; De Araújo, Alessandro C. ; Gamo, Minoru ; Goulden, Michael L. ; Rano, Takashi Hi ; Huete, Alfredo R. ; Kondo, Hiroaki ; Kumagai, Tomo'omi ; Loescher, Henry W. ; Miller, Scott ; Nobre, Antonio D. ; Nouvellon, Yann ; Oberbauer, Steven F. ; Panuthai, Samreong ; Roupsard, Olivier ; Saleska, Scott ; Tanaka, Katsunori ; Tanaka, Nobuaki ; Tu, Kevin P. ; Von Randow, Celso. / The land-atmosphere water flux in the tropics. In: Global Change Biology. 2009 ; Vol. 15, No. 11. pp. 2694-2714.
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