Upper Ocean Processes under the Stratocumulus Cloud Deck in the Southeast Pacific

摘要：本文将利用海洋环流模式（OGCM）实验研究东南太平洋上层海洋的热收支，主要目的是提高对上层海洋过程的认识，这些过程控制着层积云甲板区海面温度的变化，这些变化可能在海洋边界层云的形成和维持中起重要作用。在最近的现场观测中收集的数据将用于创建地表强迫场，以整合OGCM并验证模型的性能。网格化的地表通量数据集将被创建，以强迫OGCM基于各种最近的卫星测量。然后将通量估计值与包括IMET浮标在20点的地面气象数据在内的现场观测所得的通量估计值进行比较。85年代,。W和2001年秋季在层积云甲板区域进行的密集野外测量。此外，OGCM的性能将基于与上层海洋的原位数据和卫星观测的比较进行评估。将根据模式输出计算上层海洋热收支的平均值和变率，并将研究负责平衡地表热通量的物理过程。特别强调了罗斯比波、大气亚季节变率和太阳穿透辐射在上层海洋热平衡的季节和年际变化中的作用。对整个层积云甲板区域模式输出的分析也将阐明该区域的大尺度上层海洋变率是如何准确地用某一点的系泊观测来表示的。更广泛的影响：在全球气候模式中正确表征层积云甲板区域的海气耦合过程是进一步改进这些模式的主要挑战之一。拟议的研究将提高对这些过程的理解和建模，从而更好地模拟气候并带来相关的社会效益。该项目还将资助一名博士后科学家参与跨学科研究。

ABSTRACTOCE-0453046The heat budget of the upper ocean in the southeast Pacific will be studied using ocean general circulation model (OGCM) experiments The primary goal is to improve the understanding of upper ocean processes that control sea surface temperature variability in the stratocumulus cloud deck region, which may play an important role in formation and maintenance of marine boundary layer clouds. The data collected during recent field observations will be utilized to create surface forcing fields to integrate the OGCM and to validate the model performance. Gridded surface flux data sets will be created to force the OGCM based on a variety of recent satellite measurements. The flux estimates will then be compared with those derived from in-situ observations including the surface meteorological data from the IMET buoy at 20.S, 85.W and the intensive field measurements in the stratocumulus deck region conducted during the fall of 2001. Also, the performance of the OGCM will be evaluated based on the comparison with in-situ data of the upper ocean and satellite observations. Mean and variability of upper ocean heat budget will be calculated from the model output, and physical processes responsible for balancing surface heat fluxes will be examined. A particular emphasis is given to the role of Rossby waves, atmospheric subseasonal variability, and penetrative solar radiation in seasonal to interannual variations of upper ocean heat balance. The analysis of the model output in the entire stratocumulus deck region will also elucidate how accurately large-scale upper ocean variability in this region is represented by mooring observations at a particular point.Broader impacts:Proper representation of air-sea coupled processes in the stratocumulus deck region in global climate models is one of the major challenges for their further improvement. The proposed research will improve understanding and modeling of these processes, leading to better climate simulations and associated societal benefits. The project will also fund a postdoctoral scientist for participating in interdisciplinary research.