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Title: How effective is albedo modification (solar radiation management geoengineering) in preventing sea-level rise from the Greenland Ice Sheet?

Albedo modification (AM) is sometimes characterized as a potential means of avoiding climate threshold responses, including large-scale ice sheet mass loss. Previous work has investigated the effects of AM on total sea-level rise over the present century, as well as AM's ability to reduce long-term ($$\gg$$10 3 yr) contributions to sea-level rise from the Greenland Ice Sheet (GIS). These studies have broken new ground, but neglect important feedbacks in the GIS system, or are silent on AM's effectiveness over the short time scales that may be most relevant for decision-making (<10 3 yr). Here in this paper, we assess AM's ability to reduce GIS sea-level contributions over decades to centuries, using a simplified ice sheet model. We drive this model using a business-as-usual base temperature forcing scenario, as well as scenarios that reflect AM-induced temperature stabilization or temperature drawdown. Our model results suggest that (i) AM produces substantial near-term reductions in the rate of GIS-driven sea-level rise. However, (ii) sea-level rise contributions from the GIS continue after AM begins. These continued sea level rise contributions persist for decades to centuries after temperature stabilization and temperature drawdown begin, unless AM begins in the next few decades. Moreover, (iii) any regrowth of the GIS is delayed by decades or centuries after temperature drawdown begins, and is slow compared to pre-AM rates of mass loss. Combined with recent work that suggests AM would not prevent mass loss from the West Antarctic Ice Sheet, our results provide a nuanced picture of AM's possible effects on future sea-level rise.
 [1] ;  [2]
  1. Pennsylvania State Univ., University Park, PA (United States). Earth and Environmental Sciences Inst.
  2. Pennsylvania State Univ., University Park, PA (United States). Earth and Environmental Sciences Inst., and Dept. of Geosciences; Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Engineering and Public Policy
Publication Date:
Grant/Contract Number:
Published Article
Journal Name:
Environmental Research Letters
Additional Journal Information:
Journal Volume: 10; Journal Issue: 8; Journal ID: ISSN 1748-9326
IOP Publishing
Research Org:
Pennsylvania State Univ., University Park, PA (United States). Earth and Environmental Sciences Inst.
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES; albedo modification; geoengineering; solar radiation management; Greenland Ice Sheet; ice sheet modeling; ice sheet; glaciology
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1238981; OSTI ID: 1457400