Warm Equatorial Upper Ocean Thermal Structure During the Mid-Pliocene Warm Period: A Data-Model Comparison

IF 4.6 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Heather L. Ford, Nikolas Wrye, Alia Wofford, Natalie Burls, Tripti Bhattacharya, Alexey Fedorov, Karim Lakhani, Mitch Lyle, Jean Lynch-Stieglitz, A. Christina Ravelo
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Abstract

The tropical Pacific climate has an outsized impact on global climate, yet future projections are poorly constrained. Data-model comparisons from the mid-Pliocene warm period ( ${\sim} $ 3.3 million years ago) can help investigate warm climate dynamics and evaluate model behavior. Here we compare proxy records to PlioMIP2 models and a model with modified cloud albedo. Relative to modern, the mid-Pliocene warm period records show subsurface warming across the tropical Pacific, strong eastern Pacific surface warming and weak western Pacific surface warming. Using clustering analyses to group model behavior relative to the proxy data, we find the model cluster with the best fit with the proxy data has enhanced warming in mid-latitude thermocline source water regions which connect to the equator through the ventilated thermocline. Our study shows tropical ocean heat content during the mid-Pliocene warm period was higher than today and has broad implications for the ocean's ability to absorb anthropogenic heat.

Abstract Image

Abstract Image

Abstract Image

上新世中期暖期暖赤道上层海洋热结构:一个数据模型比较
热带太平洋气候对全球气候有着巨大的影响,但对未来的预测却缺乏约束。上新世中期暖期(约330万年前)的数据模型比较有助于研究暖气候动力学和评估模型行为。在这里,我们将代理记录与PlioMIP2模型和修改云反照率的模型进行比较。与现代相比,上新世中期暖期记录显示整个热带太平洋的地下变暖,东太平洋表面变暖强烈,西太平洋表面变暖弱。通过聚类分析将模型行为与代理数据进行分组,发现与代理数据拟合最优的模型簇在通过通风的温跃层与赤道相连的中纬度温跃层源水区增强了增温。我们的研究表明,上新世中期暖期的热带海洋热含量高于今天,这对海洋吸收人为热量的能力具有广泛的意义。
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来源期刊
Geophysical Research Letters
Geophysical Research Letters 地学-地球科学综合
CiteScore
9.00
自引率
9.60%
发文量
1588
审稿时长
2.2 months
期刊介绍: Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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