التفاصيل البيبلوغرافية
| العنوان: |
Southwest Pacific Ocean Warming Driven by Circulation Changes. |
| المؤلفون: |
Sutton, P. J. H., Rickard, G. J., Roemmich, D. H. |
| المصدر: |
Geophysical Research Letters; 7/16/2024, Vol. 51 Issue 13, p1-10, 10p |
| مصطلحات موضوعية: |
ANTARCTIC Circumpolar Current, MARINE heatwaves, OCEAN currents, OCEAN, SEAWATER salinity, ENTHALPY, OCEAN color |
| مصطلحات جغرافية: |
CHATHAM Islands (N.Z.), NEW Zealand |
| مستخلص: |
An area of ocean centered on 179°E, 46°S has warmed to full depth since 2006, with surface warming around 5 times the global rate. This Subtropical Front area is associated with a confluence of warm, salty, subtropical water from the north carried in a western boundary current and cold, fresh, subantarctic water from the south carried in the northernmost branch of the Antarctic Circumpolar Current. Temperature and salinity changes observed from Argo floats indicate that the Subtropical Frontal Zone has moved west ∼120 km, creating this area of strong warming analogous to changes in extension regions of other western boundary currents. The warming is a result of changes in the local flows of subantarctic water, evident in satellite altimeter data and 1,000 m Argo trajectories, which in turn likely result from changes in meridional ocean heat content and winds. The warming has placed this biologically‐significant region in almost perpetual marine heatwave conditions. Plain Language Summary: An area of ocean east of New Zealand has warmed strongly since 2006 through the full ocean depth. The warming has been driven by a change in Southern Ocean currents, which, in turn appear to result from changes in the ocean heat content gradient between mid and high latitudes and changes in wind. The change is occurring in a biologically highly‐productive area of importance to Orange Roughy and Hoki fisheries. Key Points: There has been strong, full‐depth ocean warming since 2006 in a region south of Chatham Islands, New ZealandSouth of Chatham Islands, the Subtropical Frontal Zone has moved 120 km westThe warming is a result of diminished Subantarctic Water flows along northern Campbell Plateau and around Bounty Trough [ABSTRACT FROM AUTHOR] |
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