A Link Between CMIP5 Phytoplankton Phenology and Sea Ice in the Atlantic Southern Ocean
A Link Between CMIP5 Phytoplankton Phenology and Sea Ice in the Atlantic Southern Ocean
复制标题
CMIP5 浮游植物物候学与南大西洋海冰之间的联系
DOI：
10.1029/2018gl078061
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发表时间：
2018
影响因子：
5.2
通讯作者：
M. Vichi
中科院分区：
文献类型：
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作者：
M. Hague;M. Vichi
气候模式比对项目第5阶段（CMIP5）的地球系统模式对南大洋浮游植物物候有强烈的偏倚，特别是在边缘冰带。在这项研究中，我们描述了驱动CMIP5模式在冬末歪曲大西洋边缘冰带季节性初级生产的机制。我们将这一时期的地下光可用性与模拟的早期生长联系起来，认为冰层覆盖和深冬混合的结合阻止了真实海洋中的生物量积累，而在模型中，这种因素的组合不存在。此外，我们发现在整个模式集合中，垂直分层与冰缘位置之间存在统计学上显著的相关性；因此，冰缘越靠近赤道，就越接近地表发生分层。我们认为，模式可以根据它们表达对其物候的两个主要控制的强烈程度进行分组，即冰边缘的位置和冬末水柱中存在的分层程度。我们发现，在其中一个控制中有小偏差的模型（但在另一个控制中有大偏差）能够模拟接近观察值的开花开始，而在两个控制中都有显著偏差的模型提前2-4个月开始生长。
Earth system models from the Climate Model Intercomparison Project phase 5 (CMIP5) are strongly biased in Southern Ocean phytoplankton phenology, especially in the marginal ice zone. In this study we describe the mechanisms driving CMIP5 models to misrepresent seasonal primary production in the Atlantic marginal ice zone during late winter. We link subsurface light availability during this period to simulated early growth, arguing that a combination of ice cover and deep winter mixing prevent biomass accumulation in the real ocean, while in models this combination of factors is not present. Furthermore, we find a statistically significant correlation across the model ensemble between vertical stratification and the location of the ice edge; whereby the more equatorward the ice edge is, the closer to the surface stratification occurs. We argue that models may be grouped according to how strongly they express two major controls on their phenology, namely, the location of the ice edge and the degree of stratification present in the water column in late winter. We find that models with small biases in just one of these controls (but large biases in the other) are able to simulate bloom initiation close to observations, while models with significant biases in both controls initiate growth 2–4 months early.
影响因子：
--
作者：
J. Sallée;E. Shuckburgh;N. Bruneau;A. Meijers;T. Bracegirdle;Zhaomin Wang;T. Roy
通讯作者：
J. Sallée;E. Shuckburgh;N. Bruneau;A. Meijers;T. Bracegirdle;Zhaomin Wang;T. Roy
影响因子：
6.3
作者：
Elvidge, A. D.;Renfrew, I. A.;King, J. C.
通讯作者：
King, J. C.