2026-10-14T13:05:21Z https://www.scidb.cn/oai

10.57760/sciencedb.02782 2022-09-22T11:27:06Z

2022-09-22 Vertical distribution of total and particulate 234Th, particulate organic carbon (POC) and nutrients with their physical forcings (temperature, salinity, fluorescence-based Chl a) doi:10.57760/sciencedb.02782 en Temperature, salinity, fluorescence-based Chl a were accessed from sensors attached to a Seabird 911 conductivity-temperature-depth (CTD); Total 234Th was precipitated by using the small-volume (4 L) MnO2 co-precipitation method (Benitez-Nelson et al., 2001; Cai et al., 2006). Particulate 234Th and POC were filterd by quartz microfiber (QMA) filters (25 mm diameter, 1.0 μm pore size) as particulate samples following method described in the JGOFS cookbook (Knap et al., 1996); the activity of 234Th was determined by a gas-flow proportional low-level RISØ beta counter (Model GM-25-5). Precipitation efficiency was determined by ICP-MS. Nutrients were analysed onboard using a Four-channel Continuous Flow Technicon AA3 Auto-Analyzer (Bran-Lube GmbH). The detection limits for both N+N (nitrate plus nitrite, termed as dissolved inorganic nitrogen, DIN) and SRP (soluble reactive phosphate) were 0.03 μmol L-1. 234Th; POC; Nutrients Yifan Ma Minhan Dai PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/10.5194/bg-20-2013-2023 Science Data Bank