Scintillometer measurements were collected over an irrigated wheat field in a semi-arid region in northwest Mexico. Conditions were unstable in the morning and stable during the afternoon, while latent heat fluxes remained high throughout the day. Regional advection was observed during near-neutral conditions. Monin-Obukhov similarity relationships for the structure parameter of temperature were verified in both unstable and stable conditions, but were violeted close to near-neutral conditions. We found that, using additional measurements of radiation, soil heat flux and windspeed, areally averages of both sensible and latent heat fluxes can be reliably predicted by large aperture scintillometer measurements, as long as the net radiation is greater than zero.
Bibliographical noteFunding Information:
The authors wish to thank the technical and scientific staff of IMADES and ITSON-DIEP for their assistance during the field experiment in the Yaqui-valley, in particular Jaime Garatuza-Payan. We would like to thank Henk de Bruin for his valuable comments on the paper, as well as the scientific and technical staff of the Department of Meteorology and Air Quality of Wageningen University, in particular Kees van den Dries, Arnold Moene and Jordi Vila. This study has been made possible with support by CONACYT Project 29340T.
- Monin-Obukhov similarity theory
- Regional advection
- Scintillation method
- Structure parameter of temperature
- Surface fluxes