Collaborative Research: Investigation of Ningaloo Nino: The role of Madden-Julian Oscillation and Leeuwin current variability

合作研究：Ningaloo Nino 的调查：Madden-Julian 振荡和 Leeuwin 电流变异性的作用

基本信息

批准号：
1658218
负责人：
Toshiaki Shinoda
金额：
$ 33.16万
依托单位：
Texas A&M University Corpus Christi
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-02-15 至 2022-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1658218&HistoricalAwards=false
关键词：
Collaborative Research Investigation Ningaloo Nino

项目摘要

During the strong La Niña event in 2010-2011, extreme ocean warming and a marine heat wave off the west coast of Australia were observed. This extreme warming event is termed as "Ningaloo Niño", an analogy to other eastern continental boundary warming phenomena such as El Niño in the Pacific and the Benguela Niño in the Atlantic. During the recent Ningaloo Niño event, SSTs off the west coast of Australia were more than 5 degree centigrade above long-term seasonal means, which is sufficient to impact large-scale atmospheric circulation and has devastating impacts on marine ecosystems and resources. In this region, locally and remotely forced ocean circulations in the southeast Indian Ocean, such as Leeuwin current system, may play a crucial role in the development of the Ningaloo Niño event. The primary goal of this proposed project is to understand physical processes that control the development of Ningaloo Niño/Niña. The proposed project will contribute to the plan and design of major international field campaigns and improving observational network in the Indian Ocean, enhancing education through supporting students and a post-doc, and advancing climate prediction. One of the PIs' institutions is recognized as a Hispanic Serving Institution by the U.S. Department of Education, and thus the project will contribute to providing training opportunities for underrepresented minorities. In addition, the proposed research will identify key processes that must be represented well in climate models, which will help improve climate model simulation and benefit society by providing more reliable climate prediction. A variety of oceanic processes that affect the 'Ningaloo Niño' will be explored in the proposed study including: 1) The impact of the remote forcing from the Pacific Ocean versus forcing over the Indian Ocean on the Leeuwin current system and Ningaloo Niño/Niña; 2) Effects of topographic trapping of westward radiating Rossby waves and their associated downwelling/upwelling associated with Ningaloo Niño/Niña events; 3) The influence of the MJO on Leeuwin current and Ningaloo Niño/Niña via oceanic processes; 4) The role of Australian summer monsoon in affecting the Ningaloo Niño/Niña events. A high-resolution Indo-Pacific basin ocean general circulation model (OGCM) will be employed, which can adequately represent complex bathymetry and topography in the Indonesian Seas. The data from enhanced in-situ observations and satellite data will be thoroughly analyzed and maximally utilized to validate the model. A series of process-oriented OGCM experiments will be performed, to quantify the impacts of remote & local forcing on the Leeuwin current system and Ningaloo/Niño, and identify key processes involved, including the role of coastal Kelvin waves and radiation of Rossby waves. The results will identify the physical processes that determine the sea surface temperature and upper-ocean variability associated with Ningaloo Niño, which can alter atmospheric circulations. In particular, the impacts of Madden-Julian oscillation and the remote forcing from the Pacific on the Leeuwin current system and Ningaloo Niño, which cannot be isolated by observations alone, will be quantified by a series of OGCM experiments. Consequently, completion of the proposed project will substantially advance our understanding of the dynamics of Leeuwin current system and Ningaloo Niño that is major climate variability in the southeast Indian Ocean.

在2010年至2011年举行的强烈的LaNiña活动中，观察到了极度的海洋变暖和澳大利亚西海岸的海洋热浪。这个极度变暖的事件被称为“ NingalooNiño”，与其他东部大陆边界变暖现象相比，例如太平洋的厄尔尼诺现象和大西洋的BenguelaNiño。在最近的NingalooNiño活动中，澳大利亚西海岸附近的SSTS超过长期季节性手段超过5度，这足以影响大规模的大气循环，并对海洋生态系统和资源产生毁灭性的影响。在该地区，印度洋东南部的本地和远程强迫海洋循环，例如Leeuwin当前系统，可能在NingalooNiño事件的发展中起着至关重要的作用。该拟议项目的主要目标是了解控制NingalooNiño/Niña发展的物理过程。拟议的项目将为主要国际现场活动的计划和设计做出贡献，并改善印度洋的观察网络，通过支持学生和DOC来增强教育，并推进气候预测。 PIS的机构之一被美国教育部认为是西班牙裔服务机构，因此该项目将有助于为代表性不足的少数民族提供培训机会。此外，拟议的研究将确定在攀岩模型中必须很好地代表的关键过程，这将通过提供更可靠的攀登预测来改善攀登模型模拟和福利社会。在拟议的研究中将探讨影响“ NingalooNiño”的各种海洋过程，包括：1）远程强迫从太平洋的远程强迫与在印度洋对Leeuwin当前系统和Ningaloo NingalooNiño/niña上的强迫的影响； 2）向西辐射的Rossby波的地形捕获及其与Ningaloo NingalooNiño/Niña事件相关的相关下降/上升流的影响； 3）MJO通过海洋过程对Leeuwin电流和NingalooNiño/Niña的影响； 4）澳大利亚夏季季风在影响Ningalooniño/Niña活动中的作用。将雇用高分辨率的印度太平洋盆地一般循环模型（OGCM），该模型可以充分代表印尼海中的复杂的测深和地形。从增强的原位观察结果和卫星数据中的数据将进行彻底分析，并最大程度地用于验证模型。将进行一系列面向过程的OGCM实验，以量化远程和局部强迫对Leeuwin当前系统和Ningaloo/Niño的影响，并确定涉及的关键过程，包括沿海开尔文波和Rossby Waves辐射的作用。结果将确定确定与NingalooNiño相关的海面温度和上洋变异性的物理过程，这些变化可以改变大气环。特别是，Madden-Julian振荡和太平洋对Leeuwin当前系统和NingalooNiño的远程强迫的影响将通过一系列OGCM实验来量化。因此，拟议项目的完成将大大提高我们对Leeuwin当前系统和NingalooNiño的动态的理解，这是印度洋东南部的主要气候变化。