We thank the officers, scientists, and crew of RRS James Clark Ross for their assistance during the fieldwork phase of this work. Two anonymous reviewers are thanked for their helpful comments. We are grateful to Alex Orsi for providing the front locations adapted in Fig. 1, and to Michel Arhan for useful advice. WOCE section A23 was funded by the Natural Environment Research Council (NERC) through Grant GST/02/575. ALBATROSS was funded by NERC through Grant GR3/11654. MPM was funded via NERC Fellowship GT5/99/MS/17.
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