Abstract

Large-scale cultivation of perennial bioenergy crops (e.g., miscanthus and switchgrass) offers unique opportunities to mitigate climate change through avoided fossil fuel use and associated greenhouse gas reduction. Although conversion of existing agriculturally intensive lands (e.g., maize and soy) to perennial bioenergy cropping systems has been shown to reduce near-surface temperatures, unintended consequences on natural water resources via depletion of soil moisture may offset these benefits. The hydroclimatic impacts associated with perennial bioenergy crop expansion over the contiguous United States are quantified using the Weather Research and Forecasting Model dynamically coupled to a land surface model (LSM). A suite of continuous (2000-09) medium-range resolution (20-km grid spacing) ensemble-based simulations is conducted using seasonally evolving biophysical representation of perennial bioenergy cropping systems within the LSM based on observational data. Deployment is carried out only over suitable abandoned and degraded farmlands to avoid competition with existing food cropping systems. Results show that near-surface cooling (locally, up to 5°C) is greatest during the growing season over portions of the central United States. For some regions, principal impacts are restricted to a reduction in near-surface temperature (e.g., eastern portions of the United States), whereas for other regions deployment leads to soil moisture reduction in excess of 0.15-0.2 m3 m-3 during the simulated 10-yr period (e.g., western Great Plains). This reduction (~25%-30% of available soil moisture) manifests as a progressively decreasing trend over time. The large-scale focus of this research demonstrates the long-term hydroclimatic sustainability of large-scale deployment of perennial bioenergy crops across the continental United States, revealing potential hot spots of suitable deployment and regions to avoid.

Original languageEnglish (US)
Pages (from-to)2535-2557
Number of pages23
JournalJournal of Climate
Volume30
Issue number7
DOIs
StatePublished - 2017

Fingerprint

bioenergy
sustainability
crop
cropping practice
soil moisture
land surface
surface temperature
resource depletion
fossil fuel
spacing
greenhouse gas
natural resource
growing season
agricultural land
maize
water resource
cooling
weather
climate change
food

Keywords

  • Atmosphere-land interaction
  • Hydrology
  • Numerical analysis/modeling
  • Renewable energy
  • Vegetation-atmosphere interactions

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

On the long-term hydroclimatic sustainability of perennial bioenergy crop expansion over the United States. / Wang, M.; Wagner, M.; Miguez-Macho, G.; Kamarianakis, Y.; Mahalov, Alex; Moustaoui, Mohamed; Miller, J.; VanLoocke, A.; Bagley, J. E.; Bernacchi, C. J.; Georgescu, Matei.

In: Journal of Climate, Vol. 30, No. 7, 2017, p. 2535-2557.

Research output: Contribution to journalArticle

Wang, M, Wagner, M, Miguez-Macho, G, Kamarianakis, Y, Mahalov, A, Moustaoui, M, Miller, J, VanLoocke, A, Bagley, JE, Bernacchi, CJ & Georgescu, M 2017, 'On the long-term hydroclimatic sustainability of perennial bioenergy crop expansion over the United States', Journal of Climate, vol. 30, no. 7, pp. 2535-2557. https://doi.org/10.1175/JCLI-D-16-0610.1
Wang, M. ; Wagner, M. ; Miguez-Macho, G. ; Kamarianakis, Y. ; Mahalov, Alex ; Moustaoui, Mohamed ; Miller, J. ; VanLoocke, A. ; Bagley, J. E. ; Bernacchi, C. J. ; Georgescu, Matei. / On the long-term hydroclimatic sustainability of perennial bioenergy crop expansion over the United States. In: Journal of Climate. 2017 ; Vol. 30, No. 7. pp. 2535-2557.
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