Preserving the Ocean Circulation: Implications for Climate Policy
Klaus Keller, Kelvin Tan, Francois M.M. Morel, David F. Bradford
NBER Working Paper No. 7476
Climate modelers have recognized the possibility of abrupt climate changes caused by a reorganization of the North Atlantic's current pattern (technically known as a thermohaline circulation collapse). This circulation system now warms north-western Europe and transports carbon dioxide to the deep oceans. The posited collapse of this system could produce severe cooling in north-western Europe, even when general global warming is in progress. In this paper we use a simple integrated assessment model to investigate the optimal policy response to this risk. Adding the constraint of avoiding a thermohaline circulation collapse would significantly reduce the allowable greenhouse gas emissions in the long run along an optimal path. Our analysis implies that relatively small damages associated with a collapse (less than 1 % of gross world product) would justify a considerable reduction of future carbon dioxide emissions.
Published: Keller, Klaus, Kelvin Tan, François M. M. Morel, and David F. Bradford. "Preserving the Ocean Circulation: Implications for Climate Policy." Climatic Change 47, 1-2 (October 2000): 17-43.