Influence of Model Bias on Simulating North Atlantic Sea Surface Temperature During the Mid-Pliocene
Influence of Model Bias on Simulating North Atlantic Sea Surface Temperature During the Mid-Pliocene
复制标题
模型偏差对上新世中期北大西洋海面温度模拟的影响
DOI：
10.1029/2018pa003397
复制
发表时间：
2018
影响因子：
3.5
通讯作者：
Yuming Zhang
中科院分区：
文献类型：
--
作者：
Zhaoyang Song;Mojib Latif;Wonsun Park;Yuming Zhang
气候模式通常低估了代理数据显示的中上新世期间北大西洋海表温度（SST）的显著变暖。本文研究了在许多气候模式中观测到的北大西洋冷海温偏倚对Kiel气候模式模拟中上新世表层气候的影响。对北大西洋进行了地表淡水通量校正，大大改善了当前条件下北大西洋环流和海温的模拟。利用封闭的白令海峡和北极群岛海峡重建的中上新世边界条件，校正后的模式与未校正模式相比，显著减小了模式-代理海温差异。大西洋经向翻转环流和向极热输送更为强烈和敏感，是减小这种差异的关键因素。我们得出结论，北大西洋上新世中期表面气候的模拟可以大大减轻该地区的模式偏差。
Climate models generally underestimate the pronounced warming in the sea surface temperature (SST) over the North Atlantic during the mid‐Pliocene that is suggested by proxy data. Here we investigate the influence of the North Atlantic cold SST bias, which is observed in many climate models, on the simulation of mid‐Pliocene surface climate in a series of simulations with the Kiel Climate Model. A surface freshwater‐flux correction is applied over the North Atlantic, which considerably improves simulation of North Atlantic Ocean circulation and SST under present‐day conditions. Using reconstructed mid‐Pliocene boundary conditions with closed Bering and Arctic Archipelago Straits, the corrected model depicts significantly reduced model‐proxy SST discrepancy in comparison to the uncorrected model. A key factor in reducing the discrepancy is the stronger and more sensitive Atlantic Meridional Overturning Circulation and poleward heat transport. We conclude that simulations of mid‐Pliocene surface climate over the North Atlantic can considerably benefit from alleviating model biases in this region.