CCAF-Science Quarterly Report for Period Ending 31 March 2003

PROJECT TITLE : The effect of Arctic Ocean processes on global climate change


COLLABORATOR(S) : O. A. Saenko and M. Eby

PROGRESS SINCE LAST REPORT (for period ending 31 March, 2003):

The primary objective of this work is to investigate the effects of Arctic Ocean related processes and their parametrisations in a global climate model with increasing atmospheric CO2 concentrations. To address this objective, we have:

Preliminary results were outlined in our previous progress reports and this analysis has now been completed.

In addition, we have addressed the important question of whether above-normal export of sea ice from the Arctic to the northern North Atlantic can result in a collapse of deep water formation.

Several other related topics have been addressed, which were in part supported by funds from the CCAF. Specifically, we focused on the link between the processes in the Arctic/North Atlantic region and those in the Southern Ocean. These included:

b) Milestones attained

We have obtained the following key results:

c) Deliverables completed

A paper is in preparation, in which the findings on the effects of Arctic Ocean processes in the global warming experiments will be outlined. In addition, the following papers have been published/in press, where a support from CCAF has been acknowledged:

Saenko O. A., E. C. Wiebe and A. J. Weaver, North Atlantic response to the export of sea ice from the Arctic. J. Geophys. Res., in press.

Saenko O. A. and A. J. Weaver, 2003: Southern Ocean upwelling and eddies: Sensitivity of the global overturning to the surface density range. Tellus,55A, 106-111.

Saenko O. A., A. J. Weaver and J. M. Gregory, On the link between the two modes of the ocean thermohaline circulation and the formation of global-scale water masses. J. Climate., in press.

Fig. 1: Zonally-averaged heat flux anomaly by the time of CO2 doubling relative to the initial steady state in a model version (upper) with active sea ice dynamics and (middle) with inactive sea ice dynamics. Shown in c) is the difference between the middle panel plot and the upper panel plot.

UVic / SEOS / Climate Group / Research Funding / CCAF Weaver, Saenko, Eby Last Updated: