大气阻塞减缓了格陵兰最大的冰川舌头因海洋而融化
Rebecca Adam McPherson1, Claudia Wekerle1, Torsten Kanzow1,2
1Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany.
概括
在格陵兰岛附近的海洋冷却
科学领域:
- 海洋学
- 冰川学
- 气候科学
背景情况:
- 格陵兰岛的冰层减少导致全球海平面上升.
- 海洋热传输影响冰川的融化速度.
研究的目的:
- 调查大西洋中间水 (AIW) 在79北冰川 (79NG) 分裂前线以下的温度变化.
- 确定这些变化对基底化和稀释率的影响.
- 确定AIW温度变化的驱动因素.
主要方法:
- 在79NG分娩前方进行直接观测.
- 对2018-2021年海洋温度数据的分析.
- 海洋循环和大气阻塞模式分析.
主要成果:
- 从2018年到2021年观察到AIW温度的下降.
- 将AIW冷却与减少海洋热传输,基本融化和稀释率联系在一起.
- 由于欧洲大气阻塞, 北欧海域的循环减缓导致AIW的降温.
结论:
- 欧洲大气封锁影响了通过弗拉姆海峡的北极气流,导致海洋变冷.
- 这种冷却机制在过去的50年里影响了格陵兰东北部的冰川.
- 大气阻塞仍然是格陵兰东北部冰川稳定的关键因素.
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