Abstract
AbstractInternational Ocean Discovery Program Sites U1437 and U1436, two intermediate water depth sites located near the Kuroshio Current were studied for planktonic proxies, shell weights, percent...
Highlights
Because of its relatively fresh surface waters, the North Pacific Ocean unlike the North Atlantic is not the site of deep-convection that could lead to the formation of a North Pacific deep-water mass
It has long been observed that the North Pacific lysocline is the shallowest on Earth (Arhenius, 1953) and that carbonate dissolution there is very intense during interglacial intervals (Farrell & Prell, 1989)
This study aims to provides an evaluation of the changes affecting the Pacific Ocean intermediate deep-water masses and their effect on the record of calcium carbonate preservation, Figure 1
Summary
Because of its relatively fresh surface waters, the North Pacific Ocean unlike the North Atlantic is not the site of deep-convection that could lead to the formation of a North Pacific deep-water mass. The North Pacific Intermediate Water Mass (NPIW; Talley, 1993) is formed via mixing of the salty subtropical Kuroshio and the fresher Oyashio currents waters in the mixed water area (Talley et al, 1995) This water mass is clearly visible on the World Ocean Circulation Experiment section profiles (Talley, 2007), through the low salinity and low O2 concentrations centered above 1,500 meters water depth along the sections in this area. Such style of circulation makes the Pacific Ocean a hostile environment for calcium carbonate preservation. U1436 receives copious ashes from nearby Aogashima Caldera, whereas U1437 more distal tends to receive only the finest volcaniclastics from distant volcanoes dispersed by winds
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