Collaborative Research: P2C2--Reconstructing Holocene Dynamics of the Indo-Pacific Tropical Rain Belt using Australian Stalagmites and Coupled Climate Models

合作研究：P2C2——利用澳大利亚石笋和耦合气候模型重建印度洋-太平洋热带雨带全新世动态

基本信息

批准号：
1602455
负责人：
Caroline Ummenhofer
金额：
$ 9.32万
依托单位：
Woods Hole Oceanographic Institution
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-06-01 至 2020-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1602455&HistoricalAwards=false
关键词：
Collaborative Research P2C2 Reconstructing Holocene

项目摘要

This collaborative project generally aims to develop a high resolution aragonite stalagmite record of Holocene Indo-Australian Summer Monsoon (IASM) variability from cave KNI-51, located at the southern margin of the Indo-Pacific tropical rain belt (TRB), a region bounded by the austral and boreal summer intertropical convergence zones. Regional monsoons represent the dominant component of low latitude hydroclimate and are sensitive to a wide array of sub-orbital forcings including solar irradiance, ENSO, and volcanic and anthropogenic aerosols. Tropical societies and ecosystems rely heavily on monsoon rainfall, and thus understanding the origin and nature of decadal-scale hydroclimate variability is critical to understanding the dynamics at play in such systems.Recent field studies of Indo-Pacific hydroclimate suggests that over the last millennium, the TRB may have contracted during the Little Ice Age (LIA) thereby producing reduced monsoon rainfall along both the northern and southern margins of the TRB. In contrast, paleohydrologic and modeling studies show that the global TRB shifted southward meridionally at this time, creating anti-phasing (dry/wet) of rainfall between the TRB northern and southern margins. The researchers have developed a sub-decadal resolved (~4 year) late Holocene (the last 3,000 years) IASM reconstruction from cave KNI-51 that, when integrated with paleomonsoon records from Southeast Asia and the Maritime Continent, reveal not only TRB contraction during the LIA, but expansion and contraction at multi-decadal to centennial time scales over the entirety of the late Holocene. The specific research goals of the project are to extend the KNI-51 stalagmite record through the middle and early Holocene (9,000-3,000 years ago) to examine the nature of TRB dynamics during conditions distinct from those of the late Holocene, including elevated contrasts between summer insolation in the Northern and Southern Hemispheres, lower eustatic sea level (and increased exposure of Indo-Pacific continental shelf), intervals of reduced Atlantic meridional overturning circulation, and the El Nino-Southern Oscillation (ENSO) regime. To better understand atmospheric circulation associated with TRB dynamics, these proxy data will be integrated with climate dynamical analyses of the 6,000 year time slice simulations conducted within the Coupled Model Intercomparison Project phase 5/Paleoclimate Modeling Intercomparison Project phase 3 (CMIP5/PMIP3) framework and with the newly available Last Millennium Ensemble (LME) simulations conducted by the National Center for Atmospheric Research (NCAR).The project involves the potential for a unique view of TRB variability over the last 9,000 years and provides an important test of the skill of CMIP5-class models to accurately reproduce associated Indo-Pacific atmospheric dynamics. As the TRB is closely tied to tropical methane production, this research will help refine estimates of regional tropical methane fluxes during the Holocene. The research will be conducted with extensive involvement of undergraduate students thereby providing experience in advanced paleoclimate research and data analysis techniques.

这个协作项目通常旨在开发高分辨率的阿拉贡石岩石岩记录，该记录是印度 - 澳大利亚夏季季风（IASM）的可变性，该洞穴kni-51位于印度太平洋热带雨带（TRB）的南部边缘，该地区是一个界限的地区。由澳大利亚和北方夏季室内收敛区。区域季风代表了低纬度气候的主要成分，并且对包括太阳辐照度，ENSO以及火山和人为气溶胶在内的各种亚轨道弯曲敏感。热带社会和生态系统在很大程度上依赖于季风降雨，因此了解衰老规模的氢化气候变异性的起源和性质对于理解这种系统中的动态至关重要。 TRB可能在小冰河时代（LIA）中收缩，从而沿TRB的北部和南部边缘降低了季风降雨量。相比之下，古水力学和建模研究表明，此时全球TRB向南移动，从而产生了TRB北部和南部边缘之间的降雨（干/湿）。研究人员已经开发了一个子少年（〜4年）晚期全新世晚期（最近3000年）的IASM重建来自Cave Kni-51，当与东南亚和海上大陆的古细胞记录集成时，不仅揭示了不仅在TRB收缩期间的TRB收缩。 LIA，但是在整个全新世晚期，多年代到百年纪念时间的扩张和收缩。该项目的具体研究目标是将KNI-51 Stalagmite记录延伸到全新世（9,000-3,000年前），以检查与晚期全新世不同的条件下TRB动态的性质，包括较高的对比北半球和南半球的夏季暴发，较低的Eustatic海平面（以及印度太平洋大陆架子的暴露量增加），大西洋子午倾覆循环的间隔以及El Nino-Southern Oscillation（ENSO）制度。为了更好地了解与TRB动力学相关的大气循环，这些代理数据将与气候动力学分析集成到耦合模型对比计划中的6，000年时间切片模拟阶段5/古气候建模项目对之间的项目阶段3（CMIP5/pmip5/pmip3）框架和框架框架和框架框架框架和框架框架框架和框架框架框架和框架框架和随着国家大气研究中心（NCAR）进行的新上千年合奏（LME）模拟。该项目涉及在过去的9，000年中独特的TRB变异性观点的潜力，并对CMIP5的技能进行了重要的测试 - 类模型，以准确再现相关的印度太平洋大气动力学。由于TRB与热带甲烷的产生紧密相关，因此这项研究将有助于改进全新世期间区域热带甲烷通量的估计。这项研究将在本科生的广泛参与下进行，从而提供高级古气候研究和数据分析技术的经验。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Increased typhoon activity in the Pacific deep tropics driven by Little Ice Age circulation changes

DOI：
10.1038/s41561-020-00656-2
发表时间：
2020-11-16
期刊：
NATURE GEOSCIENCE
影响因子：
18.3
作者：
Bramante, James F.;Ford, Murray R.;Donnelly, Jeffrey P.
通讯作者：
Donnelly, Jeffrey P.

Decoupling of monsoon activity across the northern and southern Indo-Pacific during the Late Glacial

DOI：
10.1016/j.quascirev.2017.09.014
发表时间：
2017-11-15
期刊：
QUATERNARY SCIENCE REVIEWS
影响因子：
4
作者：
Denniston, R. F.;Asmerom, Y.;Lucker, S.
通讯作者：
Lucker, S.

Coupling of Indo-Pacific climate variability over the last millennium

DOI：
10.1038/s41586-020-2084-4
发表时间：
2020-03-09
期刊：
NATURE
影响因子：
64.8
作者：
Abram, Nerilie J.;Wright, Nicky M.;Heslop, David
通讯作者：
Heslop, David

Palaeoclimate perspectives on the Indian Ocean Dipole

DOI：
10.1016/j.quascirev.2020.106302
发表时间：
2020-06-01
期刊：
QUATERNARY SCIENCE REVIEWS
影响因子：
4
作者：
Abram, Nerilie J.;Hargreaves, Jessica A.;England, Matthew H.
通讯作者：
England, Matthew H.

Can Australian Multiyear Droughts and Wet Spells Be Generated in the Absence of Oceanic Variability?

在没有海洋变化的情况下，澳大利亚会出现多年干旱和潮湿天气吗？

DOI：
10.1175/jcli-d-15-0694.1
发表时间：
2016
期刊：
Journal of Climate
影响因子：
4.9
作者：
Taschetto, Andréa S.;Gupta, Alex Sen;Ummenhofer, Caroline C.;England, Matthew H.
通讯作者：
England, Matthew H.