Seasonal controls on the exchange of carbon and water in an Amazonian rain forest - Hutyra, Lucy R; Munger, William; Saleska, Scott R.; Gottieb, Elaine; Daube, Bruce C.; Dunn, Allison L.; Amaral, Daniel F.; Camargo, Plinio Barbosa de; Wofsy, Steven C. (Journal of Geophysical Research, 2007)