<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Santos, G. M.</style></author><author><style face="normal" font="default" size="100%">Ferguson, J.</style></author><author><style face="normal" font="default" size="100%">Acaylar, K.</style></author><author><style face="normal" font="default" size="100%">Johnson, K.R.</style></author><author><style face="normal" font="default" size="100%">Druffel, E.</style></author><author><style face="normal" font="default" size="100%">Griffin, S.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">D14C and d13C of Seawater DIC as Tracers of Costal Upwelling: A 5-year time series from Southern California</style></title><secondary-title><style face="normal" font="default" size="100%">Radiocarbon</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Keck / AMS Lab</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><volume><style face="normal" font="default" size="100%">53</style></volume><abstract><style face="normal" font="default" size="100%">Marine radiocarbon (14C) is a widely used tracer of past ocean circulation, but very few high-resolution records have been obtained. Here, we report a time series of carbon isotope abundances of dissolved inorganic carbon (DIC) in sur- face seawater collected from the Newport Beach pier in Orange County, within the Southern California Bight, from 2005 to 2010. Surface seawater was collected bimonthly and analyzed for 14C, 13C, and salinity. Results from May 2005 to Novem- ber 2010 show no long-term changes in 13C DIC values and no consistent variability that can be attributed to upwelling. 14C DIC values have lowered from ~34‰ to about ~16‰, an 18‰ decrease from the beginning of this project in 2005, and is con- sistent with the overall 14C depletion from the atmospheric thermonuclear bomb pulse at the end of the 1950s. 14C DIC val- ues, paired with salinity, do appear to be suitable indicators of upwelling strength with periods of upwelling characterized by more saline and lower DIC 14C values. However, a similar signal was not observed during the strong upwelling event of 2010. These results were obtained in the Southern California Bight where upwelling is fairly weak and there is a complex oceanographic circulation in comparison with the remaining western USA coastline. It is therefore likely that the link between DIC 14C, salinity, and upwelling would be even stronger at other sites. These data represent the longest time series of 14C data from a coastal Southern California site performed to date.</style></abstract><issue><style face="normal" font="default" size="100%">4</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><section><style face="normal" font="default" size="100%">669-677</style></section></record></records></xml>