NSFGEO-NERC: Understanding Trans-Hemispheric Modes of Climate Variability: A Novel Tree-Ring Data Transect spanning the Himalaya to the Southern Ocean

NSFGEO-NERC：了解气候变化的跨半球模式：跨越喜马拉雅山到南大洋的新型树轮数据样带

• 批准号: NE/W007223/1
• 负责人: Robert Wilson
• 金额: $ 32万
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FW007223%2F1
• 关键词: NSFGEO; NERC; Understanding; Trans; Hemispheric

The mechanisms that govern trans-hemispheric climate linkages and those between the tropics and higher latitudes are not well understood, especially before the Anthropogenic period. Hence there are gaps in knowledge that limit our understanding of broader-scale climate teleconnections on interannual to decadal and longer time scales. Unlike the western Americas, where symmetries and common oscillatory modes are observed due to geographic similarities between the two hemispheres, the western Pacific lacks such symmetry, and data coverage of high resolution, well-dated paleorecords is limited over much of the region. We propose to repurpose an existing tree-ring data transect spanning from the Himalaya to the Southern Ocean, based on wood samples from our archives collected from broader monsoon Asia down to southern middle latitudes. By creating a new data network that focuses on earlywood (EW) and latewood (LW) width and maximum and minimum Blue Intensity (BI), these data will be used to enhance prior climate analyses based almost entirely on the single total ring-width (RW) parameter. BI is an indirect proxy of relative wood density and has been shown to be potentially more responsive to temperature and hydroclimate than TRW alone at low cost and effort. This expanded data transect will be used to model and reconstruct key modes of atmosphere-ocean variability between the northern and southern hemispheres (NH and SH).The NSF-NERC project PIs have jointly pioneered BI and EW-LW research in the tropics and SH mid-latitudes. Proof of concept data show that BI, EW and LW parameters for several Himalayan, tropical and mid-latitude SH conifers are robustly reflective of climate variability, placing our research team in a unique position to expand our knowledge of temperature and hydroclimate variability across the region. This new suite of data will provide the opportunity to model and reconstruct key indicators of atmosphere-ocean circulation dynamics across this transect, the tropical Indo-Pacific is a key region of interest, where the El Niño-Southern Oscillation (ENSO), Intertropical Convergence Zone (ITCZ), and Indian Ocean Dipole are dominant sources of climate variability with global impact. Volcanism perturbs climate across both hemispheres, while the Southern Annular Mode or Antarctic Oscillation impacts climate towards the SH mid latitudes at the southern end of our transect. The new data coverage, parameters, analyses and reconstructions will allow us to address several outstanding research questions, including: 1. What are the climatic impacts of volcanic events in the tropics and Southern Hemisphere? 2. How have the ITCZ and ENSO varied of the past 500-1000 years as expressed across our study region? And 3. How has the Southern Annular Mode varied over the past millennium, and is it driven by tropical forcing? To understand the global response to climate requires robust, high-resolution paleoclimate data from the tropics and SH, which our proposed transect will provide.This project will lead to an improved understanding of past variability in climate-sensitive, yet data-sparse regions of the Eastern Hemisphere transect proposed herein, some of the most climatically vulnerable regions of the globe. These data will be disseminated to the broader community via the International Tree-Ring Data Bank and other venues and will be included in a future iteration of the Monsoon Asia Drought Atlas. Education will be an important component of this project as well. Data from this project will be used for instructional purposes in a Masters level class taught at Columbia University (CU) by the lead PI and an undergraduate level course at Rider University (RU) by the RU PI. RU students will participate in this project and travel between RU and CU for educational activities. Regular virtual student exchanges will take place between students from RU, CU and foreign partners.

尚未很好地理解过跨性气候联系的机制以及热带和较高纬度之间的机制，尤其是在人为时期之前。因此，知识的差距限制了我们对年龄段至十年级和更长时间尺度的更广泛气候触发连接的理解。与西方不同，由于两个半球之间的地理相似性，观察到对称性和共同的振荡模式，西太平洋缺乏这种对称性，而高分辨率的数据覆盖范围，高分子的年代范围良好的古记录受到该地区的许多地区的限制。我们建议根据我们从较宽的季风亚洲收集到南部中纬度的档案，复制从喜马拉雅山到南大洋的现有树环数据样品。通过创建一个新的数据网络，该数据网络侧重于早期木（EW）和Latewood（LW）宽度以及最大和最小蓝色强度（BI），这些数据将用于增强基于单个总环（RW）参数的先前气候分析。 BI是相对木质密度的间接代表，并且与单独的低成本和精力相比，与单独使用TRW相比，对温度和氢化气候的反应可能更高。该扩展的数据样带将用于建模和重建北半球和南半球之间大气 - 海洋可变性的关键模式（NH和SH）。NSF-NERC项目PIS在热带和SH中期的SH中共同开创了BI和EW-LW研究。概念证明数据表明，几种喜马拉雅，热带和中纬度SH会议的BI，EW和LW参数可牢固地反映气候变化，使我们的研究团队处于独特的位置，以扩大我们对整个地区温度和氢化气候变异性的了解。这套新的数据套件将为建模和重建整个样品的大气 - 海洋循环动力学的关键指标提供机会，热带印度 - 太平洋是一个关键的关键区域，在该区域中，ElNiño-Southern振荡（ENSO），Intratropical Intratopical Contracence区域（ITCZ）（ITCZ）和印度海洋二波尔（Inaze Dipole）在全球范围内具有统治地位可变性。火山症笼罩着两个半球的气候，而南方环形模式或南极振荡将气候影响到我们样带南端的SH中纬度。新的数据覆盖范围，参数，分析和重建将使我们能够解决几个出色的研究问题，包括：1。火山事件在热带和南半球的气候影响是什么？ 2。在我们研究区域中表达的过去500 - 1000年的ITCZ和ENSO如何变化？ 3。在过去的千年中，南方环形模式如何变化，这是由热带强迫驱动的吗？要了解全球对气候的反应，需要来自热带和SH的强大，高分辨率的古气候数据，我们提议的横断面将提供。该项目将提高人们对气候敏感的，数据 - 帕斯斯地区的过去变异性的了解，但在本文中提出了最易于易于易于的环境。这些数据将通过国际树环数据库和其他场所传播到更广泛的社区，并将包含在季风亚洲干旱地图集的未来迭代中。教育也将是该项目的重要组成部分。该项目的数据将用于哥伦比亚大学（CU）的硕士课程中，由RU PI的Rider University（RU）在哥伦比亚大学（CU）教授。 RU学生将参加该项目，并在Ru和Cu之间进行教育活动。定期的虚拟学生交流将在RU，CU和外国伴侣的学生之间进行。

项目成果

Evaluating the dendroclimatological potential of blue intensity on multiple conifer species from Australasia

评估澳大利亚多种针叶树物种蓝色强度的树木气候潜力

• DOI: 10.5194/bg-2021-119
• 发表时间: 2021
• 作者: Wilson R

Evaluating the dendroclimatological potential of blue intensity on multiple conifer species from Tasmania and New Zealand

评估塔斯马尼亚和新西兰多种针叶树物种蓝色强度的树木气候潜力

• DOI: 10.5194/bg-18-6393-2021
• 发表时间: 2021
• 期刊: Biogeosciences
• 影响因子: 4.9
• 作者: Wilson R

Experiments of the efficacy of tree ring blue intensity as a climate proxy in central and western China

树木年轮蓝色强度作为中西部地区气候代理的有效性试验

• DOI: 10.5194/egusphere-2023-135
• 发表时间: 2023
• 作者: Zheng Y