Geochemical measurements of marine sediment porewater from Long Core Expedition KN223

The KN223 research cruise on board the R/V Knorr (Chief scientist Richard W. Murray; Principal investigators: Arthur J. Spivack, Steven D’Hondt, Robert A. Pockalny took place in October-December 2014 and had as primary goal to collect sedimentary pore water from a series of sites in the North Atlantic and determine if these samples can be used to (1) document how deep Atlantic meridional overturning circulation (AOM) of the last glacial maximum differed from that of the present, and (2) directly test the influence of last glacial maximum AMOC on atmospheric CO2 (via the pre-formed NO3- content of deep and intermediate water in the LGM North Atlantic). Geochemical measurements were performed at 9 sites across the North Atlantic, on 6 Multicores, 8 Gravity cores, and 9 Long Cores. Here we present shipboard porewater density, sulfate anomaly and concentration, alkalinity, dissolved inorganic carbon, and formation factor data. Porewater concentrations of sodium, magnesium, calcium, and potassium measured post-expedition are also included.

KN223科考航次由R/V Knorr号考察船执行（首席科学家：Richard W. Murray；主要研究者：Arthur J. Spivack、Steven D’Hondt、Robert A. Pockalny），于2014年10月至12月开展。其首要目标是从北大西洋一系列站位采集沉积孔隙水（sedimentary pore water），并验证这些样本是否可用于：（1）记录末次冰盛期（Last Glacial Maximum, LGM）深层大西洋经向翻转环流（Atlantic meridional overturning circulation, AOM）与现代的差异；（2）通过末次冰盛期北大西洋深层及中层水的预形成硝酸盐（pre-formed NO3-）含量，直接验证末次冰盛期大西洋经向翻转环流（AMOC）对大气二氧化碳（CO2）的影响。在北大西洋的9个站位开展了地球化学测量（geochemical measurements），涉及6个多管岩心（Multicores）、8个重力岩心（Gravity cores）和9个长岩心（Long Cores）。本文呈现了船载孔隙水密度（shipboard porewater density）、硫酸盐异常（sulfate anomaly）及浓度、碱度（alkalinity）、溶解无机碳（dissolved inorganic carbon）和形成因子（formation factor）的数据。此外还包含了考察后（post-expedition）测量的孔隙水中钠（sodium）、镁（magnesium）、钙（calcium）和钾（potassium）的浓度数据。