HR: 1400h
AN: H33A-06 [Abstracts]
TI: Temporal variability of water fluxes and surface energy exchanges over a Low Deciduous Forest in the NAM region
AU: * Garatuza-Payan, J
EM: garatuza@itson.edu.mx
AF: Instituto Tecnologico de Sonora, 5 de Febrero 818 Sur, Cd. Obregon, Son 85000, Mexico
AU: Watts, C J
EM: watts@nirvana.uson.mx
AF: Universidad de Sonora, Blvd. Encinas y Rosales, Hermosillo, Son , Mexico
AU: Rodriguez, J C
EM: jcrod2001@yahoo.com
AF: Universidad de Sonora, Blvd. Encinas y Rosales, Hermosillo, Son , Mexico
AB:
In this study the seasonal and yearly variability of latent heat flux and surface energy exchanges over a Low
Deciduous Forest (LDF) is investigated. The LDF is one of the most diverse and most contrasting ecosystems in
Mexico. It can be found from the south of Sonora to the border of Mexico with Guatemala. In the present study, the
CO2 fluxes over the LDF were analyzed in the period from June 2004 to December 2006. The CO2, latent and
sensible heat, and momentum fluxes were measured using the Eddy covariance method. The Eddy covariance
system consists of a 3-D sonic anemometer (CSAT3, Campbell Scientific), a gas analyzer (LI-7500, LI-COR), and
diverse meteorological equipment controlled by a datalogger (CR5000, Campbell Scientific). The measures
were made at 10Hz, collecting, storing and averaging the measurements every 30 minutes. The same type of
cover is present in, at least, 3 km around the tower. The measurements show some variability in total rainfall
(400-500 mm/year), average latent and sensible heat flux (30-35 and 65-72 w m-2, respectively), radiation
balance (118-127 w m-2). Reflectances vary from 0.15 during the dry season to 0.05 after the rainy season
and from 0.35 to 0.15 for the red and near infrared regions respectively resulting in NDVI values ranging from 0.3
to 0.85 with an abrupt change just after the monsoon starts accompanied by a decrease in surface temperature
(from 329 to 300 K, during the day). Despite of these changes, albedo only varies marginally, from 0.12 to 0.09.
This ecosystem presents a clear growing season corresponding to the rain season in the summer.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 1818 Evapotranspiration
DE: 1878 Water/energy interactions (0495)
SC: Hydrology [H]
MN: 2007 Joint Assembly