Evaluating the Drivers of Quaternary Dust Fluxes to the Western North Pacific: East Asian Dustiness and Northern Hemisphere Gustiness
Evaluating the Drivers of Quaternary Dust Fluxes to the Western North Pacific: East Asian Dustiness and Northern Hemisphere Gustiness
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DOI：
10.1029/2022pa004571
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发表时间：
2023-08
影响因子：
3.5
通讯作者：
J. Abell;G. Winckler;A. Pullen;C. Kinsley;P. Kapp;J. Middleton;F. Pavia;D. McGee;H. Ford;M. Raymo
中科院分区：
文献类型：
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作者：
J. Abell;G. Winckler;A. Pullen;C. Kinsley;P. Kapp;J. Middleton;F. Pavia;D. McGee;H. Ford;M. Raymo
量化过去几百万年来东亚尘埃产生和输送的可变性，并查明其背后的机制，对于限制未来的尘埃排放和沉积至关重要。我们目前通过第四纪对东亚尘埃动力学的了解主要局限于北太平洋的低分辨率记录、中国黄土高原的记录和干旱盆地的古环境重建。所有这些都容易受到沉积物的筛选和聚焦，以及缺乏约束或未识别的非尘埃碎屑物质的输入。为了避免这些限制，我们研究了来自北太平洋的高分辨率、恒通量代理衍生的尘埃通量，并发现了与晚更新世-全新世相比，晚更新世-早更新世冰川尘埃通量更高的证据。我们的结果表明，从东亚通过第四纪输送到中纬度北太平洋的沙尘减少。这一观察结果表面上与以前来自海洋沉积物和中电的尘埃记录不一致，也与东亚晚更新世与冰川放大有关的更高的尘埃产生和输送的看法相矛盾。我们提供了三种可能的情景来描述东亚冰尘动力学的∼2,700-Ky演化，并在沉积物生产、有效性和大气环流的背景下对它们进行了讨论。我们的数据和拟议的驱动机制不仅对通常用于解释东亚和北太平洋尘埃档案的框架提出了质疑，而且还为假说检验和未来产生更好约束的古尘埃通量记录所需的工作提供了路线图。
Quantifying variability in, and identifying the mechanisms behind, East Asian dust production and transport across the last several million years is essential for constraining future dust emissions and deposition. Our current understanding of East Asian dust dynamics through the Quaternary is primarily limited to low‐resolution records from the North Pacific Ocean, those from the Chinese Loess Plateau (CLP), and paleoenvironmental reconstructions from arid basins. All are susceptible to sediment winnowing and focusing as well as input of poorly constrained or unidentified non‐dust detrital material. To avoid these limitations, we examine high‐resolution, constant flux proxy‐derived dust fluxes from the North Pacific and find evidence for higher glacial dust fluxes in the late Pliocene‐early Pleistocene compared to the late Pleistocene‐Holocene. Our results suggest decreasing dust transported to the mid‐latitude North Pacific Ocean from eastern Asia across the Quaternary. This observation is ostensibly at odds with previous dust records from marine sediments and the CLP, and with the perception of higher East Asian dust production and transport during the late Pleistocene associated with the amplification of glaciations. We provide three possible scenarios to describe the ∼2,700‐ky evolution of eastern Asia glacial dust dynamics, and discuss them in the context of sediment production, availability, and atmospheric circulation. Our data and proposed driving mechanisms not only raise questions about the framework typically used to interpret dust archives from East Asia and the North Pacific Ocean, but also provide a roadmap for hypothesis testing and future work necessary to produce better‐constrained records of paleo‐dust fluxes.