It means that the climate models will be underestimating the rate of melting to the ice in Antarctica and the strength of the wind in places like New Zealand will have a higher proportion of strong Westerlies.
This year in particular New Zealand has had a succession of strong westerly winds which has brought flooding to the west coast but also drought to the populated areas in the east.
The technical reasons for the drought are dealt with here. http://www.climateoutcome.kiwi.nz/drought.html
The report on the original research is here.