The impact of resolving the Rossby radius at mid-latitudes in the ocean: results from a high-resolution version of the Met Office GC2 coupled model
The impact of resolving the Rossby radius at mid-latitudes in the ocean: results from a high-resolution version of the Met Office GC2 coupled model
复制标题
DOI：
10.5194/gmd-9-3655-2016
复制
发表时间：
2016-10-13
影响因子：
5.1
通讯作者：
Wood, Richard A.
中科院分区：
文献类型：
--
作者：
Hewitt, Helene T.;Roberts, Malcolm J.;Wood, Richard A.
越来越多的证据表明，解决中尺度涡旋和西部边界流以及地形控制的流动可以发挥重要作用，在海气相互作用与垂直和横向输送的热量和盐。在这里，我们描述了英国气象局全球耦合模式版本2（GC 2）的发展，相对于标准模式的分辨率增加：海洋分辨率从1/4增加到1/12度（赤道28到9公里），大气分辨率从60公里（N216）增加到25公里（N512），耦合周期从3小时减少到每小时。所需的技术发展，以建立一个版本的模型在更高的分辨率，以及从20年的模拟结果。结果表明，海洋模式的分辨率提高所发挥的关键作用：减少海表温度（SST）的偏差，改善海洋热传输，更深，更强的翻转环流和更强的南极绕极流。我们的研究结果表明，这里看到的改进需要在大气和海洋成分以及高频耦合的高分辨率。这些结果增加了大量的证据，表明海洋分辨率是开发天气和气候应用耦合模型时的一个重要考虑因素。
There is mounting evidence that resolving mesoscale eddies and western boundary currents as well as topographically controlled flows can play an important role in air-sea interaction associated with vertical and lateral transports of heat and salt. Here we describe the development of the Met Office Global Coupled Model version 2 (GC2) with increased resolution relative to the standard model: the ocean resolution is increased from 1/4 to 1/12 degrees (28 to 9 km at the Equator), the atmosphere resolution increased from 60 km (N216) to 25 km (N512) and the coupling period reduced from 3 hourly to hourly. The technical developments that were required to build a version of the model at higher resolution are described as well as results from a 20-year simulation. The results demonstrate the key role played by the enhanced resolution of the ocean model: reduced sea surface temperature (SST) biases, improved ocean heat transports, deeper and stronger overturning circulation and a stronger Antarctic Circumpolar Current. Our results suggest that the improvements seen here require high resolution in both atmosphere and ocean components as well as high-frequency coupling. These results add to the body of evidence suggesting that ocean resolution is an important consideration when developing coupled models for weather and climate applications.