We present here results of an 18-month survey (July 2007–March 2009) of a suite of selected trace metals (TM: Co, Ni, Cu, Pb) in a 2350 m-deep offshore water column in the Ligurian Sea (Northwestern Mediterranean Sea). This low-nutrient low-chlorophyll region is characterised by a long stratification period (May–November) during which surface waters are depleted of macronutrients. Trace metals exhibit a range of biogeochemical behaviours from surface-enriched (scavenged-type) to surface-depleted (nutrient-like) with Co and Ni as representative cases. Cobalt (28–172 pM) distributions are governed by external inputs of aeolian dust deposition and removal by adsorption onto particles in surface, intermediate and deep waters as well. Nickel (3.57–5.52 nM) distributions are governed by internal biogeochemical cycles, together with physical mixing and circulation patterns. Nickel is primarily removed from surface waters with biogenic particles and then remineralised at depth. Copper (1.39–2.89 nM) distributions illustrate a mixture of the two typical behaviours mentioned above. Distributions of typically anthropogenic and particle-reactive Pb (82–235 pM) are in agreement with a Mediterranean flow source of Pb for the adjacent North Atlantic Ocean. The mechanisms controlling the biogeochemical cycling of TMs, such as atmospheric inputs, physical forcing, and interactions with primary production, are discussed according to the TM physico-chemical properties and biological importance.

我们在此展示了在利古里亚海（西北部）深2350 m的近海水柱中对一系列选定的痕量金属（TM：Co，Ni，Cu，Pb）进行的为期18个月（2007年7月至2009年3月）调查的结果。地中海）。低营养低叶绿素区域的特征是分层时间长（5月至11月），在此期间地表水中缺乏大量营养素。痕量金属表现出一系列的生物地球化学行为，从表面富集（清除型）到表面贫化（类似养分），以Co和Ni为代表。钴（28–172 pM）的分布受风沙尘埃沉积和外部吸附的外部输入控制，这些尘埃也通过吸附到地表水，中间水和深水中的颗粒上而去除。镍（3.57–5.52 nM）的分布受内部生物地球化学循环的控制，以及物理混合和循环模式。首先从具有生物成因颗粒的地表水中去除镍，然后再进行深度矿化。铜（1.39–2.89 nM）分布说明了上述两种典型行为的混合。典型的人为和颗粒反应性Pb（82–235 pM）的分布与邻近北大西洋的地中海Pb流动源一致。根据TM的理化性质和生物学重要性，讨论了控制TM的生物地球化学循环的机制，例如大气输入，物理强迫以及与初级生产的相互作用。89 nM）分布说明了上述两种典型行为的混合。典型的人为和颗粒反应性Pb（82–235 pM）的分布与邻近北大西洋的地中海Pb流动源一致。根据TM的理化性质和生物学重要性，讨论了控制TM的生物地球化学循环的机制，例如大气输入，物理强迫以及与初级生产的相互作用。89 nM）分布说明了上述两种典型行为的混合。典型的人为和颗粒反应性Pb（82–235 pM）的分布与邻近北大西洋的地中海Pb流动源一致。根据TM的理化性质和生物学重要性，讨论了控制TM的生物地球化学循环的机制，例如大气输入，物理强迫以及与初级生产的相互作用。