NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Ocean-Atmosphere Interactions Modulate Irrigation's Climate ImpactsNumerous studies have focused on the local and regional climate effects of irrigated agriculture and other land cover and land use change (LCLUC) phenomena, but there are few studies on the role of ocean- atmosphere interaction in modulating irrigation climate impacts. Here, we compare simulations with and without interactive sea surface temperatures of the equilibrium effect on climate of contemporary (year 2000) irrigation geographic extent and intensity. We find that ocean-atmosphere interaction does impact the magnitude of global-mean and spatially varying climate impacts, greatly increasing their global reach. Local climate effects in the irrigated regions remain broadly similar, while non-local effects, particularly over the oceans, tend to be larger. The interaction amplifies irrigation-driven standing wave patterns in the tropics and mid-latitudes in our simulations, approximately doubling the global-mean amplitude of surface temperature changes due to irrigation. The fractions of global area experiencing significant annual-mean surface air temperature and precipitation change also approximately double with ocean-atmosphere interaction. Subject to confirmation with other models, these findings imply that LCLUC is an important contributor to climate change even in remote areas such as the Southern Ocean, and that attribution studies should include interactive oceans and need to consider LCLUC, including irrigation, as a truly global forcing that affects climate and the water cycle over ocean as well as land areas.
Document ID
20160013557
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Krakauer, Nir Y. (City Coll. of the City Univ. of New York NY, United States)
Puma, Michael J. (Columbia Univ. New York, NY, United States)
Cook, Benjamin I. (NASA Goddard Inst. for Space Studies New York, NY, United States)
Gentine, Pierre (Columbia Univ. New York, NY, United States)
Nazarenko, Larissa (Columbia Univ. New York, NY, United States)
Date Acquired
November 17, 2016
Publication Date
November 10, 2016
Publication Information
Publication: Earth System Dynamics
Volume: 7
Issue: 4
Subject Category
Oceanography
Meteorology and Climatology
Report/Patent Number
GSFC-E-DAA-TN37409
Funding Number(s)
CONTRACT_GRANT: NA11SEC4810004
CONTRACT_GRANT: NA15OAR4310080
CONTRACT_GRANT: NNX14AB99A
CONTRACT_GRANT: 68346-00 46
CONTRACT_GRANT: NA12OAR4310084
CONTRACT_GRANT: 2207
Distribution Limits
Public
Copyright
Other
Keywords
Air water interactioins
Oceans
Irrigation
Simulation
Climate