Surface climate signals transmitted rapidly to deep North Atlantic throughout last millennium
Surface climate signals transmitted rapidly to deep North Atlantic throughout last millennium
复制标题
DOI：
10.1126/science.adf1646
复制
发表时间：
2023-11
期刊：
影响因子：
56.9
通讯作者：
Wanyi Lu;D. Oppo;G. Gebbie;D. Thornalley
中科院分区：
文献类型：
--
作者：
Wanyi Lu;D. Oppo;G. Gebbie;D. Thornalley
对次表层海洋变暖的仪器观测表明，海洋热吸收减缓了20世纪的表面变暖。我们提出了高分辨率记录从亚极地北大西洋沉积物是一致的仪器观测的表面和深层变暖/清新，此外重建的表面深的关系，在过去的1200年。从~1300米及更深的地点表明，在中世纪气候异常到小冰期的过渡中，约有0.5摄氏度的冷却，开始于~1350 ± 50共同时代（CE），而地表记录表明异步冷却开始跨越~600年。这些数据表明，海洋环流整合了由大西洋经向海洋环流迅速传递到深度的表面变化，这意味着海洋在过去的一千年里像今天一样缓和了地球表面的温度。地球上由于人为气候变化而积累的多余热量中，约有90%被海洋吸收，从而减缓了大气温度的上升。大部分热量通过大规模海洋环流模式从海面转移到深海。在人类开始使地球变暖之前，这种机制也是活跃的吗？Lu等人报告了对亚极地北大西洋沉积物的观测结果，表明大西洋经向海洋环流通过将热量从表面迅速转移到深海，至少在过去1200年里抑制了大气和上层海洋温度的变化。-H.过去1200年的地表气候变化迅速传播到北大西洋深处。
Instrumental observations of subsurface ocean warming imply that ocean heat uptake has slowed 20th-century surface warming. We present high-resolution records from subpolar North Atlantic sediments that are consistent with instrumental observations of surface and deep warming/freshening and in addition reconstruct the surface-deep relation of the last 1200 years. Sites from ~1300 meters and deeper suggest an ~0.5 degrees celsius cooling across the Medieval Climate Anomaly to Little Ice Age transition that began ~1350 ± 50 common era (CE), whereas surface records suggest asynchronous cooling onset spanning ~600 years. These data suggest that ocean circulation integrates surface variability that is transmitted rapidly to depth by the Atlantic Meridional Ocean Circulation, implying that the ocean moderated Earth’s surface temperature throughout the last millennium as it does today. Description Editor’s summary Approximately 90% of the excess heat that Earth has accumulated due to anthropogenic climate change has been absorbed by the oceans, thereby moderating atmospheric temperature increases. Much of that heat has been transferred from the surface to the deep ocean by large-scale ocean circulation patterns. Was this mechanism also active before humans started warming the planet? Lu et al. report observations from subpolar North Atlantic sediments showing that the Atlantic Meridional Ocean Circulation has dampened atmospheric and upper ocean temperature changes for at least the past 1200 years by rapidly transferring heat from the surface to the deep ocean. —H. Jesse Smith Surface climate changes of the past 1200 years propagated rapidly to the deep North Atlantic.