首页|冰期旋回中南大洋与热带太平洋相互作用过程与机制

冰期旋回中南大洋与热带太平洋相互作用过程与机制

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南大洋翻转环流推动南半球高低纬度之间水团的交换，热带太平洋是全球水汽和热量的重要源区，推动着哈德利和沃克环流以及厄尔尼诺-南方涛动(ENSO)等关键过程的发生。这些过程有效地将热量从热带地区传送至高纬度地区，也在年际至年代际时间尺度上促进了南半球高低纬度之间大气环流的相互作用。热带太平洋与南大洋之间在冰期旋回中呈现出错综复杂的海洋与大气环流间的相互作用，涉及物质、能量与水汽的交换，对全球气候变化产生明显影响。迄今为止，高纬冰芯和沉积岩心记录已深入地揭示了冰期旋回中受类 ENSO 过程影响出现南大洋海水温度和海冰与南极降雪等的演变过程。同时，热带沉积岩心记录也显示在冰期旋回期间，印度洋-太平洋暖池次表层的升温是南大洋积累的过剩热量，通过浅层翻转环流向北，经由亚热带环流向低纬度传输的结果。这些记录不仅支持南大洋流通性增强会影响低纬度大洋生物地球化学循环的观点，同时也表明冰期旋回中，印-太暖池升温引发的类 ENSO 式变化可能主导着热带太平洋大气环流模式，并对南大洋地区的大气环流产生影响。然而，由于目前在多时间尺度上与热带遥相关有关的古海洋记录有限，使得目前对南大洋与热带太平洋相互作用过程和机制的理解与评估仍存在诸多不确定性。因此，持续开展多指标环南极柱状沉积物的调查分析工作可以为热带遥相关气候模型提供更真实的环境变化参数，从而减少这些不确定性。
The interaction processes and mechanisms between the Southern Ocean and the tropical Pacific during glacial cycles
The overturning circulation of the Southern Ocean(SO)drives the exchange of water masses between high and low latitudes in the Southern Hemisphere(SH).Concurrently,the tropical Pacific serves as a cru-cial source of global water vapor and heat,influencing key processes such as the Hadley and Walker circula-tions and the El Niño-Southern Oscillation(ENSO).These processes effectively transport heat from tropical regions to higher latitudes and foster interactions between atmospheric circulations across the SH on inter-annual to decadal timescales.During glacial cycles,complex interactions between oceanic and atmospheric circulations are evident between the tropical Pacific and the SO,involving significant exchanges of matter and energy that impact global climate change.High-latitude ice and sediment cores'records have extensively documented the evolution of sea surface temperatures and sea ice of SO,as well as Antarctic precipitation influenced by ENSO-like processes during glacial cycles.Meanwhile,tropical sediment core records indi-cate that subsurface warming of the Indo-Pacific Warm Pool during these cycles results from excess heat from the SO being transported northwards via shallow overturning cell and subtropical circulations.These records not only support the notion that enhanced SO circulation affects biogeochemical cycles and material exchanges in low-latitude oceans but also suggest that glacial cycle-induced warming of the Indo-Pacific Warm Pool could trigger ENSO-like changes,dominating tropical Pacific atmospheric circulation patterns and impacting SO atmospheric circulation.However,due to the limited paleoceanographic records of tropi-cal teleconnections across multiple timescales,significant uncertainties remain in understanding and assess-ing the interaction processes and mechanisms between the SO and the tropical Pacific.Therefore,ongoing investigations and analyses of multi-proxy circum-Antarctic sediment cores are essential to provide more accurate environmental change parameters for tropical teleconnection climate models,thereby reducing these uncertainties.

ENSO/SAM-likeatmospheric bridgeoceanic tunneltropical teleconnectionspaleocean-ographic recordsSouthern Oceantropical Pacific Ocean

熊志方、王家凯、秦秉斌、郭景腾、李铁刚

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自然资源部第一海洋研究所,海洋地质与成矿作用重点实验室,山东 青岛 266061

青岛海洋科技中心,海洋地质过程与环境功能实验室,山东 青岛 266237

类ENSO/SAM 大气桥梁 海洋隧道 热带遥相关 古海洋记录 南大洋 热带太平洋

极地专项山东省自然科学基金国家自然科学基金泰山学者工程项目泰山学者工程项目

IRASCC2020-2022-01-03-02ZR2023QD18642306266TS20190963TSQN202211265

2024

10.13679/j.jdyj.20240055

极地研究
国家海洋局极地考察办公室 中国极地研究中心

极地研究

CSTPCD北大核心
影响因子：0.638
ISSN：1007-7073
年,卷(期)：2024.36(3)
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