Basal glacial melting and its contribution to bottom water formation and ocean circulation in the Antarctic continental margins under changing environmental conditions.

环境条件变化下基底冰川融化及其对南极大陆边缘底水形成和海洋环流的贡献。

• 批准号: 256165858
• 负责人: Dr. Oliver Huhn
• 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: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/256165858?language=en
• 关键词: Basal; glacial; melting; its; contribution

In the Weddell Sea, the actual state of basal ice shelf melting, its variability and possible future trends due to changing climate conditions are not yet fully understood. To study and to understand its impact on the Antarctic Bottom Water composition and formation rate and related variability as well as the impact on the global ocean circulation more tracer observations are urgently needed. The aims of the proposed project are:A) To produce an improved actual estimate of basal glacial melt water inventories and basal melting rates for the ice shelves in the western (Larsen Ice Shelf) and southern Weddell Sea (Filchner Ice Shelf) to be able to address temporal trends in the futureB) To trace the pathways of the basal melt water, how it contributes to local Antarctic Bottom Water formation, and to quantify the related actual Antarctic Bottom Water formation rates.C) To investigate, if there is evidence for local shifts or temporal trends in glacial melting processes and related Antarctic Bottom Water formation. Possible changes could be related to changes in the ice shelves, as Larsen A, B are now ice free, in contrast to Larsen C and Filchner, which both are still ice covered, or to changing properties or circulation of ambient water masses.D) To assess, how local processes and their variability are related to basin wide or global scales (e.g. observed basin wide Antarctic Bottom Water property changes, warming, freshening, age increase and declining ventilation, slow down anthropogenic carbon uptake, declining volumes, trends).Tracer observations will help substantially to investigate and quantify basal glacial melting (stable noble gas isotopes [3He, 4He, Ne] to quantify basal glacial melt water inventories), basal melt rates and Antarctic Bottom Water formation (transient trace gases [CFCs] to determine transit time scales [TTDs], formation rates, and the related anthropogenic carbon uptake) and their variability.These objectives contribute to three major goals of the SPP 1158:* Dynamics of the Climate System Components* Response to Environmental Change* (The Weddell Sea as a) Gateway to Lower Latitudes

在威德尔海，由于气候条件变化，基底冰架融化的实际状态、其变化性以及未来可能的趋势尚未完全了解。为了研究和了解其对南极底层水组成和形成速率以及相关变化的影响以及对全球海洋环流的影响，迫切需要更多的示踪观测。拟议项目的目标是：A) 对西部（拉森冰架）和南部威德尔海（菲尔希纳冰架）冰架的基底冰川融水库存和基底融化速率进行改进的实际估计，以便能够解决未来的时间趋势B) 追踪基础融水的路径，它如何促进当地南极底层水的形成，并量化相关的实际南极底层水形成C) 调查是否有证据表明冰川融化过程和相关的南极底水形成存在局部变化或时间趋势。可能的变化可能与冰架的变化有关，因为拉森 A、B 现在没有冰，而拉森 C 和菲尔奇纳仍然被冰覆盖，或者与周围水团的性质或循环的变化有关。D)评估局部过程及其变异性与整个流域或全球尺度的关系（例如观察到的整个流域的南极底层水性质变化、变暖、清新、老化和通风下降、减缓人为碳吸收、水量下降、示踪剂观测将大大有助于调查和量化基底冰川融化（稳定惰性气体同位素 [3He、4He、Ne]，以量化基底冰川融水库存）、基底融化速率和南极底水形成（瞬态痕量气体 [CFC]） ] 确定渡越时间尺度 [TTD]、形成速率和相关的人为碳吸收）及其变异性。这些目标有助于实现以下三个主要目标： SPP 1158：*气候系统组成部分的动态*对环境变化的响应*（威德尔海作为通往低纬度地区的门户）

项目成果

Environmental information for a marine ecosystem research approach for the northern Antarctic Peninsula (RV Polarstern expedition PS81, ANT-XXIX/3)

南极半岛北部海洋生态系统研究方法的环境信息（RV Polarstern 探险队 PS81、ANT-XXIX/3）

• DOI: 10.1007/s00300-015-1861-2
• 发表时间: 2016-05-01
• 期刊: Polar Biology
• 影响因子: 1.7
• 作者: B. Dorschel;J. Gutt;O. Huhn;A. Bracher;M. Huntemann;W. Huneke;C. Gebhardt;M. Schröder;H. Herr
• 通讯作者: H. Herr

Water masses in the Bransfield Strait and adjacent seas, austral summer 2013

布兰斯菲尔德海峡和邻近海域的水团，2013 年澳大利亚夏季

• DOI: 10.1007/s00300-016-1936-8
• 发表时间: 2013
• 期刊: Polar Biology
• 影响因子: 1.7
• 作者: Huneke; W. G. C.; O. Huhn; M. Schröder
• 通讯作者: M. Schröder

Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf

冰架下第一批稀有气体样本的基础熔化率和冻结率

• DOI: 10.1029/2018gl079706
• 发表时间: 2018
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Huhn; O.; T. Hattermann; P. E. D. Davis; E. Dunker; H. H. Hellmer; K. W. Nicholls; S. Østerhus; M. Rhein; M. Schröder; J. Sültenfuß
• 通讯作者: J. Sültenfuß

Precursors of Antarctic Bottom Water formed on the continental shelf off Larsen Ice Shelf

拉森冰架附近大陆架形成的南极底水前体

• DOI: 10.1016/j.dsr.2015.01.004
• 发表时间: 2015
• 作者: M. van Caspel; M. Schröder; O. Huhn; H. H. Hellmer
• 通讯作者: H. H. Hellmer

On the warm inflow at the eastern boundary of the Weddell Gyre

威德尔环流东部边界的暖流

• DOI: 10.1016/j.dsr.2015.11.002
• 发表时间: 2024-09-14
• 作者: S. Ryan;M. Schröder;O. Huhn;R. Timmermann
• 通讯作者: R. Timmermann