부산대학교 도서관

We present here a global oceanic compilation of .sup.234 Th measurements that collects results from researchers and laboratories over a period exceeding 50 years. The origin of the .sup.234 Th sampling in the ocean goes back to 1967, when Bhat et al. (1969) initially studied .sup.234 Th distribution relative to its parent .sup.238 U in the Indian Ocean. However, it was the seminal work of Buesseler et al. (1992) - which proposed an empirical method to estimate export fluxes from .sup.234 Th distributions - that drove the extensive use of the .sup.234 Th-.sup.238 U radioactive pair to evaluate the organic carbon export out of the surface ocean by means of the biological carbon pump. Since then, a large number of .sup.234 Th depth profiles have been collected using a variety of sampling instruments and strategies that have changed during the past 50 years. The present compilation is made of a total 223 data sets: 214 from studies published in either articles in refereed journals, PhD theses, or repositories, as well as 9 unpublished data sets. The data were compiled from over 5000 locations spanning all the oceans for total .sup.234 Th profiles, dissolved and particulate .sup.234 Th activity concentrations (in dpm L.sup.-1 ), and POC:.sup.234 Th ratios (in µmol dpm.sup.-1) from both sediment traps and filtration methods. A total of 379 oceanographic expeditions and more than 56 600 .sup.234 Th data points have been gathered in a single open-access, long-term, and dynamic repository. This paper introduces the dataset along with informative and descriptive graphics. Appropriate metadata have been compiled, including geographic location, date, and sample depth, among others. When available, we also include water temperature, salinity, .sup.238 U data (over 18 200 data points), and particulate organic nitrogen data. Data source and method information (including .sup.238 U and .sup.234 Th) is also detailed along with valuable information for future data analysis such as bloom stage and steady-/non-steady-state conditions at the sampling moment. The data are archived on the PANGAEA repository, with the dataset DOI https://doi.org/10.1594/PANGAEA.918125 (Ceballos-Romero et al., 2021). This provides a valuable resource to better understand and quantify how the contemporary oceanic carbon uptake functions and how it will change in future.
Byline: Elena Ceballos-Romero, Ken O. Buesseler, María Villa-Alfageme To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: https://essd.copernicus.org/articles/14/2639/2022/essd-14-2639-2022.html, or to download the full-text, [...]