The dissolved Beryllium isotope composition of the Arctic Ocean

Pleistocene variations of beryllium isotopes in central Arctic Ocean sediment cores

“…3). The resulting near surface 10 Be/ 9 Be in the two cores is somewhat lower than the present day deep water 10 Be/ 9 Be data but within the range of presently observed Arctic water column data (Frank et al, 2009). The regression lines for the entire 10 Be/ 9 Be data sets result in average sedimentation rates of 1.9 mm ka − 1 for core 09JPC and 1.6 mm ka − 1 for core 14JPC but the scatter around the exponential regression line is still large and similar to that of the 10 Be concentration profiles.…”

“…Schlosser et al, 1995) which are well homogenized with respect to Be isotopes (Frank et al, 2009). However the low fluxes of 10 Be to the seafloor that have been observed for parts of the Arctic Ocean imply that the pre-Holocene conditions must have been quite different.…”

Carrier free 10Be/9Be measurements with low-energy AMS: Determination of sedimentation rates in the Arctic Ocean

“…When comparing the 10 Be/ 9 Be ratios at the core tops determined with the carrier-free and the conventional method we note that the carrier-free values (P10 À8 ) match better to values observed in Arctic bottom waters [15]. This is an important control, as the top of the core should represent the recent, seawater-derived 10 Be/ 9 Be ratio.…”

The competition between coastal trace metal fluxes and oceanic mixing from the 10Be/9Be ratio: Implications for sedimentary records

“…The main underlying assumption to the framework of von Blanckenburg and Bouchez [2014] is that dissolved Be isotopes are well mixed before being incorporated into marine authigenic phases. Given the power of meteoric 10 Be and the 10 Be/ 9 Be ratio in seawater and sediment to reconstruct processes like riverine and dust metal inputs [Brown et al, 1992a;von Blanckenburg et al, 1996;Frank et al, 2009], estuarine removal [Kusakabe et al, 1991], boundary scavenging [Anderson et al, 1990], trace metal mixing von Blanckenburg and Igel, 1999], and pore water mobility of metals [Bourlès et al, 1989b], it is surprising that this system did not find mentioning in recent reviews of elemental and isotope proxies for marine trace metal cycles [Jeandel and Oelkers, 2015;Jeandel, 2016]. This release of Fe, Be, and other metals from sediments to pore waters during boundary exchange may provide an important transfer mechanism between sediment and seawater [e.g., Anderson et al, 2014;Jeandel and Oelkers, 2015].…”