In spring, the Mediterranean Sea, a well-stratified low-nutrient–low-chlorophyll region, receives atmospheric deposition by both desert dust from the Sahara and airborne particles from anthropogenic sources. Such deposition translates into a supply of new nutrients and trace metals for the surface waters that likely impact biogeochemical cycles. However, the relative impacts of the processes involved are still far from being assessed in situ. After summarizing the knowledge on dust deposition and its impact on the Mediterranean Sea biogeochemistry, we present in this context the objectives and strategy of the PEACETIME project and cruise. Atmospheric and marine in situ observations and process studies have been conducted in contrasted areas encountering different atmospheric deposition context, including a dust deposition event that our dedicated “fast-action” strategy allowed us to catch. Process studies also include artificial dust seeding experiments conducted on board in large tanks in three ecoregions of the open waters of the Mediterranean Sea for the first time. This paper summarizes the work performed at sea and the type of data acquired in the atmosphere, at the air–sea interface and in the water column. An overview of the results presented in papers of this special issue (and in some others published elsewhere) is presented.

中文翻译：

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简介：地中海大气层沉积后在海-海界面进行的过程研究– PEACETIME海洋学活动的目标和战略（2017年5月至6月）

春季，地中海是一个高度分层的低营养，低叶绿素区域，它受到来自撒哈拉沙漠的沙尘和人为来源的空气传播颗粒的大气沉积。这种沉积转化为地表水供应了新的养分和微量金属，这可能会影响生物地球化学循环。但是，所涉及过程的相对影响仍远未就地评估。在总结了有关尘埃沉积及其对地中海生物地球化学的影响的知识之后，我们在此背景下介绍了PEACETIME项目和巡游的目标和策略。在遇到不同大气沉积情况的对比地区进行了大气和海洋原位观测和过程研究，包括尘土飞扬事件，我们专用的“快速行动”策略使我们得以捕捉。工艺研究还包括首次在地中海开放水域三个生态区的大型水箱中进行人工除尘实验。本文总结了海上开展的工作以及在大气，海-气界面和水柱中获取的数据类型。概述了本期特刊（以及其他发表在其他地方的论文）中呈现的结果。本文总结了海上开展的工作以及在大气，海-气界面和水柱中获取的数据类型。概述了本期特刊（以及其他发表在其他地方的论文）中呈现的结果。本文总结了海上开展的工作以及在大气，海-气界面和水柱中获取的数据类型。概述了本期特刊（以及其他发表在其他地方的论文）中呈现的结果。