Publication Abstracts

Singh et al. 2018

Singh, D., S.P. McDermid, B.I. Cook, M.J. Puma, L. Nazarenko, and M. Kelley, 2018: Distinct influences of land-cover and land-management on seasonal climate. J. Geophys. Res. Atmos., 123, no. 21, 12017-12039, doi:10.1029/2018JD028874.

Anthropogenic land-use and land-cover change is primarily represented in climate model simulations through prescribed transitions from natural-vegetation to cropland or pasture. However, recent studies have demonstrated that land-management practices, especially irrigation, have distinct climate impacts. Here, we disentangle the seasonal climate impacts of land-cover change and irrigation across areas of high agricultural intensity using climate simulations with three different land-surface scenarios: 1) natural-vegetation cover/no irrigation, 2) Year 2000 crop-cover/no irrigation, and 3) Year 2000 crop-cover and irrigation rates. We find that irrigation substantially amplifies land-cover induced climate impacts but has opposing effects across certain regions. Irrigation mostly causes surface cooling, which substantially amplifies land-cover change-induced cooling in most regions except over Central, West and South Asia, where it reverses land-cover change induced warming. Despite increases in net surface radiation in some regions, this cooling is associated with enhancement of latent relative to sensible heat fluxes by irrigation. Similarly, irrigation substantially enhances the wetting influence of land-cover change over most regions including West Asia and the Mediterranean. The most notable contrasting impacts of these forcings on precipitation occur over South Asia, where irrigation offsets the wetting influence of land-cover during the monsoon season. Changes in regional circulations and moist static energy induced by these forcings contribute to their precipitation impacts and are associated with differential changes in surface and tropospheric temperature gradients and moisture availability. These results emphasize the importance of including irrigation forcing to evaluate the combined climate effects of land-surface changes for attributing historical changes and managing future impacts.

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BibTeX Citation

  author={Singh, D. and McDermid, S. P. and Cook, B. I. and Puma, M. J. and Nazarenko, L. and Kelley, M.},
  title={Distinct influences of land-cover and land-management on seasonal climate},
  journal={J. Geophys. Res. Atmos.},

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RIS Citation

ID  - si01300f
AU  - Singh, D.
AU  - McDermid, S. P.
AU  - Cook, B. I.
AU  - Puma, M. J.
AU  - Nazarenko, L.
AU  - Kelley, M.
PY  - 2018
TI  - Distinct influences of land-cover and land-management on seasonal climate
JA  - J. Geophys. Res. Atmos.
VL  - 123
IS  - 21
SP  - 12017
EP  - 12039
DO  - 10.1029/2018JD028874
ER  -

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