Rapid 20th century warming reverses 900-year cooling in the Gulf of Maine
Rapid 20th century warming reverses 900-year cooling in the Gulf of Maine
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DOI：
10.1038/s43247-022-00504-8
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发表时间：
2022-08
影响因子：
7.9
通讯作者：
Nina M. Whitney;A. Wanamaker;C. Ummenhofer;Beverly J. Johnson;N. Cresswell-Clay;K. Kreutz
中科院分区：
文献类型：
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作者：
Nina M. Whitney;A. Wanamaker;C. Ummenhofer;Beverly J. Johnson;N. Cresswell-Clay;K. Kreutz
位于北大西洋西部的缅因湾最近经历了迅速的海洋变暖，但缺乏长期的仪器记录，阻碍了了解这些重大水文变化的能力。在这里，我们展示了多个300年来的长达300年的地球化学记录(氧、氮和以前发表的放射性碳同位素)，这些记录是在缅因州西部海湾的绝对日期的北极岛贝壳中测量的。这些记录，结合气候模型模拟，表明缅因湾在过去1000年的大部分时间里经历了长期的冷却，主要是由火山强迫和北大西洋动力学驱动的。这种冷却趋势被19世纪末开始的变暖逆转，这可能是由于大气中温室气体浓度的增加和北大西洋西部环流的变化。气候模型模拟表明，上个世纪的气候变暖比该地区过去1000年中几乎任何其他100年的时期都要快。
The Gulf of Maine, located in the western North Atlantic, has undergone recent, rapid ocean warming but the lack of long-term, instrumental records hampers the ability to put these significant hydrographic changes into context. Here we present multiple 300-year long geochemical records (oxygen, nitrogen, and previously published radiocarbon isotopes) measured in absolutely-datedArctica islandicashells from the western Gulf of Maine. These records, in combination with climate model simulations, suggest that the Gulf of Maine underwent a long-term cooling over most of the last 1000 years, driven primarily by volcanic forcing and North Atlantic ocean dynamics. This cooling trend was reversed by warming beginning in the late 1800s, likely due to increased atmospheric greenhouse gas concentrations and changes in western North Atlantic circulation. The climate model simulations suggest that the warming over the last century was more rapid than almost any other 100-year period in the last 1000 years in the region.