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Variability of Antarctic Bottom Water formation and export from the Weddell Sea

南极底水形成和威德尔海出口的变化

基本信息

批准号：
44294647
负责人：
Professorin Dr. Monika Rhein
金额：
--
依托单位：
Abteilung Ozeanographie
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2007
资助国家：
德国
起止时间：
2006-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/44294647?language=en
关键词：
Variability Antarctic Bottom Water formation

项目摘要

The Atlantic sector of the Southern Ocean (i.e., the Weddell Sea) is the main supplier for Antarctic Bottom Water (AABW) to the World Ocean. Changes in the formation rate – caused by environmental changes – could modify the strength and variability of the Meridional Overturning Circulation (MOC) and, thus, affect climate and climate change. Changes in the AABW formation process and in the amount of AABW formed might also influence the anthropogenic carbon uptake of the deep ocean. The proposal contributes to the International Polar Year (IPY) in the framework of CASO (Climate in Antarctica and the Southern Ocean). CASO aims to understand, interpret and predict climate variability and change in the southern polar region and its impact on Antarctic and global processes. The aims of this proposal are: • To determine the AABW formation in the Weddell Sea, especially to assess the variability of deep and bottom water formation. This time series is needed to understand links between the variability of bottom water formation and changing environmental conditions (i.e., degradation of ice shelves, enhanced melting, warming, freshening) • To determine the export of Weddell Sea Deep and Bottom Water (subsequently AABW) through the South Scotia Ridge and across the Greenwich Meridian and the import of deep water from easterly sources and their variability. • To determine the pathways and volume of AABW and its variability leaking into Drake Passage towards the west. • To determine the transport and variability of the Southeast Pacific Deep Slope Water (SPDSW) in the Antarctic Circumpolar Current and its supply of 3-helium to the South Atlantic and Weddell Sea.

南大洋的大西洋部分（即，威德尔海（Weddell Sea）是世界海洋南极底层水（AABW）的主要供应者。由环境变化引起的形成率的变化可能会改变经向翻转环流（MOC）的强度和变率，从而影响气候和气候变化。AABW形成过程和AABW形成量的变化也可能影响深海的人为碳吸收。该提案有助于在南极洲和南大洋气候框架内开展国际极地年活动。CASO旨在了解、解释和预测南极地区的气候变率和变化及其对南极和全球过程的影响。·确定威德尔海的AABW地层，特别是评估深水和底层水地层的变化。需要这个时间序列来了解底层水形成的可变性和不断变化的环境条件之间的联系（即，·确定威德尔海深水和底层水（后来的AABW）通过南斯科舍海岭和穿过格林威治子午线的输出，以及来自东风源的深水的输入及其变化。·确定AABW的路径和体积及其向西泄漏到德雷克海峡的可变性。·确定东南太平洋深海斜坡水（SPDSW）在南极绕极流中的输送和变化及其对南大西洋和威德尔海的3-氦供应。