Chemistry and circulation of the Mediterranean Sea

在过去的几十年里，地中海的环流发生了巨大的变化。这其中表现为深水地层从亚得里亚海转移到爱琴海。这两种来源形成的深水具有不同的盐度和温度性质，以及不同的生物地球化学特征。地中海的特点是，它具有隔离大量人为二氧化碳的潜力(即高碱度、高温度和活跃的翻转环流)。事实上，Cant的柱库存在地中海比世界海洋中的任何其他地方都要高，而地中海的Cant存储是人为二氧化碳排放的重要组成部分。然而，地中海的碳数据很少，人们对最近环流的变化如何影响Cant的储存率也知之甚少。拟议的项目将支持我们计划在横跨地中海的一段RV Meteor(M84/2)上巡航期间对样品进行测量，以确定氦同位素、氚和Ne，并将支持一名科学家评估巡航数据。该计划将扩展地中海现有的示踪剂数据时间序列。

The last few decades has seen dramatic changes in the circulation of the Mediterranean Sea. This is manifested amongst others as a shift of deep water formation from the Adriatic to the Aegean Seas. The deep water formed from these two sources has different properties of salinity and temperature and different biogeochemical signature. The characteristics of the Mediterranean Sea are such that it has the potential to sequester large amounts of anthropogenic CO2, Cant, (i.e. high alkalinity and temperature and an active overturning circulation). In fact, the column inventories of Cant are higher in the Mediterranean than anywhere else in the world ocean, and the Cant storage in the Mediterranean is a significant portion of the anthropogenic emissions of CO2. However, few carbon data exist in the Mediterranean Sea, and very little is known about how the recent changes in circulation has affected the storage rate of Cant. The proposed project will support measurements of samples for determination of helium isotopes, tritium and neon that we plan to sample during a cruise on the RV Meteor (M84/2) on a section across the Mediterranean Sea, and will support a scientist to evaluate the data from the cruise. This program will extend an existing time-series of tracer data in the Mediterranean Sea.