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Advection Influences on Evapotranspiration of Alfalfa in a Semiarid Climate

USDA–Agricultural Research Service Conservation and Production Research Laboratory, P.O. Drawer 10, Bushland, TX 79012

View larger version (24K): [in a new window]   Fig. 1. Wind speed and wind direction analyses for the days included in the study.

View larger version (163K): [in a new window]   Fig. 2. Aerial view of the alfalfa field and surrounding landscape.

View larger version (8K): [in a new window]   Fig. 3. Layout of the lysimeter field.

View larger version (35K): [in a new window]   Fig. 4. The 20-yr average and 1998 Class A pan evaporation and precipitation for the cropping season.

View larger version (24K): [in a new window]   Fig. 5. (A) Daily evapotranspiration (ET), (B) average vapor pressure deficit (VPD), and (C) wind speed for the north and south lysimeters for the days used in the analyses.

View larger version (31K): [in a new window]   Fig. 6. Daily evapotranspiration (ET) partitioned into the equilibrium ET (ETeq) and imposed (ETimp) contributions as stacked bar graphs for the north and south lysimeters.

View larger version (23K): [in a new window]   Fig. 7. Changes in vapor pressure deficit (VPD) and wind, and partitioning between equilibrium evapotranspiration (ETeq) and imposed ET (ETimp) as stacked bar graphs on day of year (DOY) 155.

View larger version (25K): [in a new window]   Fig. 8. Changes in vapor pressure deficit (VPD) and wind, and partitioning between equilibrium evapotranspiration (ETeq) and imposed ET (ETimp) as stacked bar graphs on day of year (DOY) 164.

View larger version (17K): [in a new window]   Fig. 9. Partitioning of daily evapotranspiration (ET) into daytime losses (ETday) and nighttime losses due to ETimp only (ETimp-night).

View larger version (20K): [in a new window]   Fig. 10. Energy used in latent heat (E) supplied by available energy (AE) and sensible heat (H) and equivalent evapotranspiration calculated using the latent heat of vaporization (2.45 MJ kg–1).

View larger version (23K): [in a new window]   Fig. 11. Energy balance fluxes on day of year (DOY) 155 and 164, including latent heat (E), available energy (AE), and E + sensible heat (H).

View larger version (14K): [in a new window]   Fig. 12. Difference between imposed evapotranspiration from the south lysimeter (ETimp-s) and the north lysimeter (ETimp-n) in relation to wind direction.

View larger version (23K): [in a new window]   Fig. 13. Wind speed and wind direction analyses for day of year 167.

View larger version (23K): [in a new window]   Fig. 14. Wind speed and wind direction analyses for day of year 151.

View larger version (16K): [in a new window]   Fig. 15. The relationships between wind speed and sensible heat flux (H), and vapor pressure deficit (VPD) and H.