TY - JOUR
T1 - Betting strategies on fluctuations in the transient response of greenhouse warming
AU - Risbey, James S.
AU - Lewandowsky, Stephan
AU - Hunter, John R.
AU - Monselesan, Didier P.
PY - 2015/11/28
Y1 - 2015/11/28
N2 - We examine a series of betting strategies on the transient response of greenhouse warming, expressed by changes in 15-year mean global surface temperature from one 15-year period to the next. Over the last century, these bets are increasingly dominated by positive changes (warming), reflecting increasing greenhouse forcing and its rising contribution to temperature changes on this time scale. The greenhouse contribution to 15-year trends is now of a similar magnitude to typical naturally occurring 15-year trends. Negative 15-year changes (decreases) have not occurred since about 1970, and are still possible, but now rely on large, and therefore infrequent, natural variations. Model projections for even intermediate warming scenarios show very low likelihoods of obtaining negative 15-year changes over the coming century. Betting against greenhouse warming, even on these short time scales, is no longer a rational proposition.
AB - We examine a series of betting strategies on the transient response of greenhouse warming, expressed by changes in 15-year mean global surface temperature from one 15-year period to the next. Over the last century, these bets are increasingly dominated by positive changes (warming), reflecting increasing greenhouse forcing and its rising contribution to temperature changes on this time scale. The greenhouse contribution to 15-year trends is now of a similar magnitude to typical naturally occurring 15-year trends. Negative 15-year changes (decreases) have not occurred since about 1970, and are still possible, but now rely on large, and therefore infrequent, natural variations. Model projections for even intermediate warming scenarios show very low likelihoods of obtaining negative 15-year changes over the coming century. Betting against greenhouse warming, even on these short time scales, is no longer a rational proposition.
KW - Climate futures
KW - Decadal trends
KW - Transient response
UR - http://www.scopus.com/inward/record.url?scp=84944097488&partnerID=8YFLogxK
U2 - 10.1098/rsta.2014.0463
DO - 10.1098/rsta.2014.0463
M3 - Article (Academic Journal)
C2 - 26460114
AN - SCOPUS:84944097488
VL - 373
JO - Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
JF - Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
SN - 1364-503X
IS - 2055
M1 - 0463
ER -