δ18O of water vapour, evapotranspiration and the sites of leaf water evaporation in a soybean canopy

Lisa R. Welp, Xuhui Lee, Kyounghee Kim, Timothy J. Griffis, Kaycie A. Billmark, John M. Baker

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

Stable isotopes in water have the potential to diagnose changes in the earth's hydrological budget in response to climate change and land use change. However, there have been few measurements in the vapour phase. Here, we present high-frequency measurements of oxygen isotopic compositions of water vapour (δv) and evapotranspiration (δET) above a soybean canopy using the tunable diode laser (TDL) technique for the entire 2006 growing season in Minnesota, USA. We observed a large variability in surface δv from the daily to the seasonal timescales, largely explained by Rayleigh processes, but also influenced by vertical atmospheric mixing, local evapotranspiration (ET) and dew formation. We used δET measurements to calculate the isotopic composition at the sites of evaporative enrichment in leaves (δL,e) and compared that with the commonly used steady-state prediction (δL,s). There was generally a good agreement averaged over the season, but larger differences on individual days. We also found that vertical variability in relative humidity and temperature associated with canopy structure must be addressed in canopy-scale leaf water models. Finally, we explored this data set for direct evidence of the Péclet effect.

Original languageEnglish (US)
Pages (from-to)1214-1228
Number of pages15
JournalPlant, Cell and Environment
Volume31
Issue number9
DOIs
StatePublished - Sep 2008

Keywords

  • Canopy scale
  • Dew
  • Evaporative site
  • Non-steady state
  • Oxygen isotopes and tunable diode laser
  • Péclet effect

Fingerprint Dive into the research topics of 'δ<sup>18</sup>O of water vapour, evapotranspiration and the sites of leaf water evaporation in a soybean canopy'. Together they form a unique fingerprint.

Cite this