My back of the envelope calculation suggests that we should be able to do this for several centuries without warming the deep waters very much while maintaining constant surface water temps. (realclimate.org)
Due to both bottom - boundary layer friction and interior adjustment, this coastal current anomaly facilitates the movement of warmer deep water upward onto the continental shelf and toward the coast (see Figure). (usclivar.org)
About 19 months after the wind churned the ocean, cycling warm deep waters upward and sending the cold surface waters down, the Totten ice shelf was noticeably thinner and had sped up. (sciencenews.org)