Abstract:
:The direct response of the tropical mixed layer to near-inertial waves (NIWs) has only rarely been observed. Here, we present upper-ocean turbulence data that provide evidence for a strongly elevated vertical diffusive heat flux across the base of the mixed layer in the presence of a NIW, thereby cooling the mixed layer at a rate of 244 W m-2 over the 20 h of continuous measurements. We investigate the seasonal cycle of strong NIW events and find that despite their local intermittent nature, they occur preferentially during boreal summer, presumably associated with the passage of atmospheric African Easterly Waves. We illustrate the impact of these rare but intense NIW induced mixing events on the mixed layer heat balance, highlight their contribution to the seasonal evolution of sea surface temperature, and discuss their potential impact on biological productivity in the tropical North Atlantic.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Hummels R,Dengler M,Rath W,Foltz GR,Schütte F,Fischer T,Brandt Pdoi
10.1038/s41467-020-17601-xsubject
Has Abstractpub_date
2020-07-31 00:00:00pages
3829issue
1issn
2041-1723pii
10.1038/s41467-020-17601-xjournal_volume
11pub_type
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