Inter- and Intra-Annual Variability in an Interactive Ocean-Atmosphere Climate System

这是一项更新拨款，用于继续研究由低分辨率大气环流模式（GCM）与相互作用的上层海洋模式耦合模拟的气候变率。将研究模式气候的年际和年内两个方面。pi将继续分析两个已经完成的100年季节性整合的变异性，一个是用与50米深的上层海洋耦合的大气模式进行的，另一个是用观测到的海洋条件规定的年循环进行的。还提出了采用更复杂的上层海洋和海冰模型的新实验方案。这些包括与规定的变深度上层海洋分量耦合的大气模式的100年季节性积分、预测混合层海洋公式、热带动力上层海洋模式和改进的海冰参数化。pi将重点描述(1)太平洋和大西洋热带和温带纬度的海洋表面温度和(2)极地纬度的海冰面积和厚度的年际变化特征。他们的目标是确定大气-冰-海洋系统不同部分的异常之间的因果关系。年际变率的研究将集中在中纬度行星尺度大气环流特征的双峰性以及大气环流和能量的季节结构的过渡移。不同实验的相互比较将确定产生气候变率的个别海洋-大气过程的相对重要性。这些过程包括海洋-大气能量交换、涉及混合层和海冰发展的机制以及海洋内部动力学。这项研究很重要，因为它试图提高对海洋-冰-大气系统如何相互作用导致气候变率的理解。

This is a renewal grant to continue an investigation of climate variability as simulated by a low resolution atmospheric general circulation model (GCM) coupled to interactive upper oceans formulations. Both interannual and intra-annual aspects of the model climate will be examined. The PIs will continue the analysis of variability within two already completed 100 year seasonal integrations one performed with the atmospheric model coupled to a 50m deep upper ocean and the other performed with a prescribed annual cycle of observed ocean conditions. New experimental initiatives with more sophisticated upper ocean and sea ice models are also proposed. These involve 100 year seasonal integrations of the atmospheric model coupled to a prescribed variable depth upper ocean component, a prognostic mixed layer ocean formulation, a tropical-dynamical upper ocean model, and a improved sea ice parameterization. The PIs will focus on characterizing the interannual variability of (1) ocean surface temperature in tropical and extratropical latitudes of the Pacific and Atlantic Ocean and (2) sea ice area and thickness in polar latitudes. They will aim to identify cause/effect relationships between anomalies in different parts of the atmosphere-ice-ocean system. The studies of intra-annual variability will focus on bimodality in planetary scale atmospheric circulation features of middle latitudes and on transition shifts in the seasonal structures of atmospheric circulation and energetic. Intercomparison of the different experiments will identify the relative importance of individual ocean-atmospheric processes that produce climate variability. These processes include ocean-atmosphere energy exchange,mechanisms involving mixed layer and sea ice development, and internal ocean dynamics. This research is important because it seeks to improve understanding of how the ocean-ice-atmosphere system interacts to cause climate variability.