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  The hydrological impact of geoengineering in the Geoengineering Model Intercomparison Project (GeoMIP)

Tilmes, S., Fasullo, J., Lamarque, J.-F., Marsh, D., Mills, M., Alterskjær, K., et al. (2013). The hydrological impact of geoengineering in the Geoengineering Model Intercomparison Project (GeoMIP). Journal of Geophysical Research-Atmospheres, 118, 11036-11058. doi:10.1002/jgrd.50868.

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 Creators:
Tilmes, S., Author
Fasullo, J., Author
Lamarque, J.-F., Author
Marsh, D.R., Author
Mills, M., Author
Alterskjær, K., Author
Muri, H., Author
Kristjánsson, J.E., Author
Boucher, O., Author
Schulz, M., Author
Cole, J.N.S., Author
Curry, C.L., Author
Jones, A., Author
Haywood, J., Author
Irvine, P.J., Author
Ji, D., Author
Moore, J.C., Author
Karam, D.B., Author
Kravitz, B., Author
Rasch, P.J., Author
Singh, B., AuthorYoon, J.-H., AuthorNiemeier, Ulrike1, Author           Schmidt, H., AuthorRobock, A., AuthorYang, S., AuthorWatanabe, S., Author more..
Affiliations:
1Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913574              

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Free keywords: geoengineering; hydrological cycle; climate change; GeoMIP; solar radiation management; monsoon
 Abstract: The hydrological impact of enhancing Earth's albedo by solar radiation management is investigated using simulations from 12 Earth System models contributing to the Geoengineering Model Intercomparison Project (GeoMIP). We contrast an idealized experiment, G1, where the global mean radiative forcing is kept at preindustrial conditions by reducing insolation while the CO2 concentration is quadrupled to a 4×CO2 experiment. The reduction of evapotranspiration over land with instantaneously increasing CO2 concentrations in both experiments largely contributes to an initial reduction in evaporation. A warming surface associated with the transient adjustment in 4×CO2 generates an increase of global precipitation by around 6.9% with large zonal and regional changes in both directions, including a precipitation increase of 10% over Asia and a reduction of 7% for the North American summer monsoon. Reduced global evaporation persists in G1 with temperatures close to preindustrial conditions. Global precipitation is reduced by around 4.5%, and significant reductions occur over monsoonal land regions: East Asia (6%), South Africa (5%), North America (7%), and South America (6%). The general precipitation performance in models is discussed in comparison to observations. In contrast to the 4×CO2 experiment, where the frequency of months with heavy precipitation intensity is increased by over 50% in comparison to the control, a reduction of up to 20% is simulated in G1. These changes in precipitation in both total amount and frequency of extremes point to a considerable weakening of the hydrological cycle in a geoengineered world.

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Language(s): eng - English
 Dates: 2013-11
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/jgrd.50868
 Degree: -

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Title: Journal of Geophysical Research-Atmospheres
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 118 Sequence Number: - Start / End Page: 11036 - 11058 Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264_1