Poleward shift in ventilation of the North Atlantic subtropical underwater
MetadataShow full item record
KeywordNorth Atlantic salinity maximum; Subtropical underwater; Poleward expansion; Ventilation; Decadal variability
We report the findings that the sea surface salinity maximum (SSS-max) in the North Atlantic has poleward expanded in recent decades and that the expansion is a main driver of the decadal changes in subtropical underwater (STUW). We present observational evidence that the STUW ventilation zone (marked by the location of the 36.7 isohaline) has been displaced northward by1.2 ± 0.36° latitude for the 34 year (1979–2012) period. As a result of the redistribution of the SSS-max water, the ventilation zone has shifted northward and expanded westward into the Sargasso Sea. The ventilation rate of STUW has increased, which is attributed to the increased lateral induction of the sloping mixed layer. STUW has become broader, deeper, and saltier, and the changes are most pronounced on the northern and western edges of the high-saline core.
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 45 (2018): 258–266, doi:10.1002/2017GL075772.
Suggested CitationGeophysical Research Letters 45 (2018): 258–266
Showing items related by title, author, creator and subject.
Recent decadal change in the North Atlantic subtropical underwater associated with the poleward expansion of the surface salinity maximum Liu, Hao; Yu, Lisan; Lin, Xiaopei (American Geophysical Union, 2019-06-11)Yu et al. (2017, https://doi.org/10.1002/2017GL075772) reported that the annual mean sea surface salinity maximum (SSS‐max) in the North Atlantic expanded northward by 0.35 ± 0.11° per decade over the 34‐year data record ...
Goodkin, Nathalie F.; Druffel, Ellen R. M.; Hughen, Konrad A.; Doney, Scott C. (Nature Publishing Group, 2012-05-01)Ventilation and mixing of oceanic gyres is important to ocean-atmosphere heat and gas transfer, and to mid-latitude nutrient supply. The rates of mode water formation are believed to impact climate and carbon exchange ...
Temporal evolution of tritium-³He age in the North Atlantic : implications for thermocline ventilation Robbins, Paul E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1997-09)This thesis is a study of the physical mechanisms that ventilate the subtropical thermocline of the eastern North Atlantic. The starting point is an analysis of the existent historical database of natural and anthropogenic ...