Articles | Volume 19, issue 11
Hydrol. Earth Syst. Sci., 19, 4547–4557, 2015
Hydrol. Earth Syst. Sci., 19, 4547–4557, 2015

Research article 16 Nov 2015

Research article | 16 Nov 2015

Climate response to Amazon forest replacement by heterogeneous crop cover

A. M. Badger1 and P. A. Dirmeyer1,2 A. M. Badger and P. A. Dirmeyer
  • 1George Mason University, Fairfax, Virginia, USA
  • 2Center for Ocean–Land–Atmosphere Studies, Fairfax, Virginia, USA

Abstract. Previous modeling studies with atmospheric general circulation models and basic land surface schemes to balance energy and water budgets have shown that by removing the natural vegetation over the Amazon, the region's climate becomes warmer and drier. In this study we use a fully coupled Earth system model and replace tropical forests by a distribution of six common tropical crops with variable planting dates, physiological parameters and irrigation. There is still general agreement with previous studies as areal averages show a warmer (+1.4 K) and drier (−0.35 mm day−1) climate. Using an interactive crop model with a realistic crop distribution shows that regions of vegetation change experience different responses dependent upon the initial tree coverage and whether the replacement vegetation is irrigated, with seasonal changes synchronized to the cropping season. Areas with initial tree coverage greater than 80 % show an increase in coupling with the atmosphere after deforestation, suggesting land use change could heighten sensitivity to climate anomalies, while irrigation acts to dampen coupling with the atmosphere.

Short summary
This study expands upon previous Amazon deforestation modeling studies by using realistic heterogeneous crop cover as replacement vegetation and diagnoses the changes in land-atmosphere coupling due to land use change. With the use of an interactive crop model, the impact that irrigation has on land-atmosphere coupling when using crops as a replacement vegetation is analyzed. This study also provides documentation on the development of tropical crops for CLM4.5.