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IPY/ASEP - Collaborative International Research: Amundsen Sea Influence on West Antarctic Ice Sheet Stability and Sea Level Rise.

IPY/ASEP - 国际合作研究：阿蒙森海对南极西部冰盖稳定性和海平面上升的影响。

基本信息

批准号：
0632282
负责人：
Stanley Jacobs
金额：
$ 158.11万
依托单位：
Columbia University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2007
资助国家：
美国
起止时间：
2007-09-15 至 2012-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0632282&HistoricalAwards=false
关键词：
IPY ASEP Collaborative International Research

项目摘要

The Office of Polar Programs, Antarctic Science Division, Ocean & Climate Systems Program has made this award to support a multidisciplinary effort to study the upwelling of relatively warm deep water onto the Amundsen Sea continental shelf and how it relates to atmospheric forcing and bottom bathymetry and how the warm waters interact with both glacial and sea ice. This study constitutes a contribution of a coordinated research effort in the region known as the Amundsen Sea Embayment Project or ASEP. Previous work by the PI and others has shown that the West Antarctic Ice Sheet has been found to be melting faster, perhaps by orders of magnitude, than ice sheets elsewhere around Antarctica, excluding those on the Peninsula. Submarine channels that incise the continental shelf are thought to provide fairly direct access of relatively warm circum polar deep water to the cavity under the floating extension of the ice shelf. Interactions with sea ice en route can modify the upwelled waters. The proposed investigations build on previous efforts by the PI and colleagues to use hydrographic measurements to put quantitative bounds on the rate of glacial ice melt by relatively warm seawater. The region can be quite difficult to access due to sea ice conditions and previous hydrographic measurements have been restricted to the austral summer time frame. In this project it was proposed to obtain the first austral spring hydrographic data via CTD casts and XBT drops (September-October 2007) as part of a separately funded cruise (PI Steve Ackley) the primary focus of which is sea-ice conditions to be studied while the RV Nathanial B Palmer (RV NBP) drifts in the ice pack. This includes opportunistic sampling for pCO2 and TCO2. A dedicated cruise in austral summer 2009 will follow this opportunity. The principal objectives of the dedicated field program are to deploy a set of moorings with which to characterize temporal variability in warm water intrusions onto the shelf and to conduct repeat hydrographic surveying and swath mapping in targeted areas, ice conditions permitting. Automatic weather stations are to be deployed in concert with the program, sea-ice observations will be undertaken from the vessel and the marine cavity beneath the Pine Island may be explored pending availability of the British autonomous underwater vehicle Autosub 3. These combined ocean-sea ice-atmosphere observations are aimed at a range of model validations. A well-defined plan for making data available as well as archiving in a timely fashion should facilitate a variety of modeling efforts and so extend the value of the spatially limited observations. Broader impacts: This project is relevant to an International Polar Year research emphasis on ice sheet dynamics focusing in particular on the seaward ocean-ice sheet interactions. Such interactions must be clarified for understanding the potential for sea level rise by melt of the West Antarctic ice Sheet. The project entails substantive international partnerships (British Antarctic Survey and Alfred Wegner Institute) and complements other Amundsen Sea Embayment Project proposals covering other elements of ice sheet dynamics. The proposal includes partial support for 2 graduate students and 2 post docs. Participants from the Antarctic Artists and Writers program are to take part in the cruise and so aid in outreach. In addition, the project is to be represented in the Lamont-Doherty annual open house.

极地项目办公室，南极科学司，海洋气候系统计划已经作出了这个奖项，以支持多学科的努力，研究相对温暖的深水上升流到阿蒙森海大陆架，以及它如何与大气强迫和海底测深，以及温暖的沃茨如何与冰川和海冰相互作用。这项研究是该地区被称为阿蒙森海湾项目或ASEP的协调研究工作的贡献。 PI和其他人以前的工作表明，南极洲西部冰盖的融化速度比南极洲其他地方的冰盖快，可能是几个数量级，不包括半岛上的冰盖。切割大陆架的海底通道被认为提供了相对温暖的环极深水到冰架浮动延伸下的空腔的相当直接的通道。途中与海冰的相互作用可以改变涌上的沃茨。拟议的调查建立在PI及其同事先前的努力基础上，利用水文测量对相对温暖的海水融化冰川冰的速度进行定量限制。由于海冰条件，该地区可能很难进入，以前的水文测量仅限于南部夏季时间范围。在该项目中，建议通过CTD铸件和XBT滴（2007年9月至10月）获得第一个南部春季水文数据，作为单独资助的巡航（PI Steve Ackley）的一部分，其主要重点是研究RV Nathanial B Palmer（RV NBP）在浮冰中漂移时的海冰条件。这包括pCO 2和TCO 2的随机采样。 2009年夏季将有一次专门的巡航。专门的实地方案的主要目标是部署一套系泊设备，以确定暖水侵入大陆架的时间变化特征，并在冰情允许的情况下，在目标地区重复进行水文测量和测绘。自动气象站将与该计划配合部署，海冰观测将从船上进行，松岛下面的海洋洞穴可能会被探索，直到英国自主水下航行器Autosub 3可用。这些综合的海洋-海冰-大气观测旨在进行一系列模式验证。一个明确的计划，使数据可用以及及时存档，应有助于各种建模工作，从而扩大空间有限的观测值。更广泛的影响：这个项目与国际极地年的研究有关，研究重点是冰盖动态，特别侧重于向海的海洋与冰盖的相互作用。必须澄清这种相互作用，以了解西南极冰盖融化导致海平面上升的可能性。该项目需要建立实质性的国际伙伴关系（英国南极调查局和阿尔弗雷德·韦格纳研究所），并补充涵盖冰盖动态其他要素的阿蒙森海湾项目其他提案。该提案包括对2名研究生和2名博士后的部分支持。来自南极艺术家和作家计划的参与者将参加这次巡航，从而帮助推广。此外，该项目将参加Lamont-Doherty年度开放日。