Response of Amazonian tropical forests to short- and long-term climatic variations

Monday, 15 December 2014: 10:20 AM
Steven C Wofsy1, Matthew Hayek1, Scott R Saleska2, Marcos Longo3, Paul R Moorcroft1, J William Munger1, Natalia Restrepo-Coupe4, Kenia T Wiedemann1, Rodrigo da Silva5, Plinio Barbosa de Camargo6, Raimundo Cosme Jr.3 and Luciana F Alves7, (1)Harvard University, Cambridge, MA, United States, (2)University of Arizona, Tucson, AZ, United States, (3)EMBRAPA Brazilian Agricultural Research Corportation, Campinas, Brazil, (4)University Technology Sydney, Sydney, Australia, (5)Universidade Federal do Oeste do ParĂ¡, Santarem, Brazil, (6)Univ Sao Paulo, Piracicaba, Brazil, (7)Instituto Agronomico de Campinas (IAC), Campinas, Brazil
Forests respond non-linearly to changes in clouds, radiative balance, climate, and atmospheric chemistry, providing strong feedbacks in terms of modified fluxes of heat, water vapor, CO2, and biogenic gases. This paper analyzes more than a decade of eddy flux and biometric observations in a central Amazon forest, and compares to other sites in the region. The time series of observations is used to partition changes in ecosystem fluxes in terms of basic responses of the ecosystem to environmental forcing as well as internal changes to the ecosystem. Using the ED-2 model, we place the observed responses in the context of projected long term changes in water balance, vegetation structure, and biophysical feedback to the atmosphere.