The Role of Indian Ocean Internal Processes in Generating Decadal Climate Variability

印度洋内部过程在产生年代际气候变化中的作用

• 批准号: 1935279
• 负责人: Weiqing Han
• 金额: $ 55.09万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1935279&HistoricalAwards=false
• 关键词: Role; Indian; Ocean; Internal; Processes

From Indonesia to East Africa, fluctuations of Indian Ocean (IO) sea surface temperature (SST) have been linked to floods, droughts, wildfires, and other disruptive impacts of shifts in rainfall and temperature. These impacts have motivated efforts to characterize IO SST variability and the physical mechanisms that drive it, efforts complicated by the sparsity of observations in the region. A key question in research to date is the extent to which variability of IO SSTs is driven by mechanisms local to the IO and how much is externally forced by El Nino events in the Pacific and other remote influences. Research by the PIs and others has focused on identifying forms of locally-driven IO SST variability and identifying the roles of atmosphere-ocean interactions and subsurface currents and ocean heat storage in generating them.Here the PIs specifically address IO SST fluctuations that take place over a decade or two, which they call the Indian Ocean Decadal Oscillations (IODOs). In its positive phase the IODO features warmer than normal SSTs extending from western Australia to southern Africa accompanied by anomalies in sea level pressure and surface wind. Simulations from the Community Earth System Model (CESM) suggest further anomalies of the subsurface ocean, with higher temperatures to a depth of 200m or so below the region of warm SSTs. The project seeks to investigate the mechanisms of the IODO and explore its impacts on the global climate system through a combination of observational analysis and model simulations.The work is of societal as well as scientific interest given the large populations living in countries surrounding the IO, many of which are quite vulnerable to the impacts of IO variablity as noted above. Results of the work can inform the development of the multi-national IO Observing System (IndOOS) as well as field campaigns organized around it. The project also provides support and training to a graduate student as well as summer support for undergraduates.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

从印度尼西亚到东非，印度洋的波动（IO）海面温度（SST）与洪水和温度转移的洪水，干旱，野火和其他破坏性影响有关。 这些影响促使努力表征IO SST的变异性和驱动它的物理机制，努力因该地区观察的稀疏而变得复杂。 迄今为止，研究中的一个关键问题是，IO SST的变异性是由IO本地机制驱动的，以及太平洋和其他远程影响的El Nino事件的外部强迫。 PIS和其他人的研究集中在识别局部驱动的IO SST变异性的形式，并识别大气 - 海洋相互作用和地下电流和海洋热存储在产生它们中的作用。PIS专门解决了IO SST波动，这些IO SST波动是十年或两次发生的，他们称它们为印度海洋十分婚姻振荡（Iseaseachecadal oscillations）。 在其正阶段，iodo的特征比正常的SST温暖，从西澳大利亚到南部非洲延伸，并伴有海平面压力和地表风中的异常。 社区地球系统模型（CESM）的模拟提出了地下海洋的进一步异常，高度较高，深度低于温暖的SST区域。该项目旨在通过观察分析和模型模拟的结合来研究iodo的机制，并探索其对全球气候系统的影响。鉴于居住在IO周围的国家中的大量人群中，这项工作是社会和科学的兴趣，其中许多人非常容易受到IO Variablity的影响，如上所述。 这项工作的结果可以告知跨国IO观察系统（Indoos）以及周围组织的现场活动的发展。 该项目还向研究生提供支持和培训，以及对本科生的夏季支持。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响审查标准来评估的。

项目成果

Inter-basin and Multi-time Scale Interactions in generating the 2019 Extreme Indian Ocean Dipole

2019年印度洋极端偶极子的跨流域和多时间尺度相互作用

• DOI: 10.1175/jcli-d-20-0760.1
• 发表时间: 2021
• 期刊: Journal of Climate
• 影响因子: 4.9
• 作者: Zhang, Lei;Han, Weiqing;Hu, Zeng-Zhen
• 通讯作者: Hu, Zeng-Zhen

Role of Oceanic Internal Instability in the Generation of Low‐Frequency Variability in the Indian Ocean

• DOI: 10.1029/2022gl102489
• 发表时间: 2023-05
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: S. Anjana;A. Chatterjee;W. Han;S. Prerna;C. K. Sajidh

Interannual to Decadal Variability of Tropical Indian Ocean Sea Surface Temperature: Pacific Influence versus Local Internal Variability

• DOI: 10.1175/jcli-d-20-0807.1
• 发表时间: 2021-04
• 期刊: Journal of Climate
• 影响因子: 4.9
• 作者: Lei Zhang;Gang Wang;M. Newman;W. Han

Eastward Shift of Interannual Climate Variability in the South Indian Ocean since 1950

• DOI: 10.1175/jcli-d-21-0356.1
• 发表时间: 2021-10
• 期刊: Journal of Climate
• 影响因子: 4.9
• 作者: Lei Zhang;W. Han;K. Karnauskas;Yuanlong Li;T. Tozuka