庄展鹏, 王刚, xxxx. 北太平洋深海温盐流场数值模拟及其季节变化特征分析[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20240202001.
引用本文: 庄展鹏, 王刚, xxxx. 北太平洋深海温盐流场数值模拟及其季节变化特征分析[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20240202001.
ZHUANG Z P, WANG G, xxxx. Numerical simulation of the temperature and salinity field in the North Pacific deep sea and analysis of its seasonal variations[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20240202001
Citation: ZHUANG Z P, WANG G, xxxx. Numerical simulation of the temperature and salinity field in the North Pacific deep sea and analysis of its seasonal variations[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20240202001

北太平洋深海温盐流场数值模拟及其季节变化特征分析

Numerical Simulation of the Temperature and Salinity Field in the North Pacific Deep Sea and Analysis of Its Seasonal Variations

  • 摘要: 深海环流研究有助于提高对全球气候变化、海洋生态系统等的深入认知,由于实测资料的缺乏,目前数值模拟仍是主要研究手段。本文基于自主研发的σ-Z-σ混合坐标MASNUM海洋环流模式,开展了面向深海环流特征分析的北太平洋气候态数值模拟研究。σ-Z-σ混合坐标系发挥了Z坐标和σ坐标的优势,可以实现对局部网格的灵活加密,是提高深海环流模拟精度的有效方法之一。WOA18、MIMOC和BOA-Argo三套网格化实测资料用于对模拟结果进行评估。对比结果表明,深海温盐场模拟结果整体上与实测资料非常接近;流场模拟结果虽然与实测资料计算得到的地转流相比存在一定偏差,但其中的深层西边界流、反气旋环流结构等分布特征较实测月平均资料更加明显,更接近于以往研究中的流场实测结果。基于数值模拟的深海环流特征分析结果显示,深层温度和盐度均值不存在明显的季节性变化,而温度和盐度均值异常的季节性变化显著,特别是温度均值异常在春夏季存在明显升高;水平和经向流函数在不同月份相差不大,表明其季节性变化不明显。

     

    Abstract: The study of deep-sea circulation contributes to a deeper understanding of global climate change, marine ecosystems, and other related aspects. Due to the lack of observational data, numerical simulation remains the primary research method at present. This paper conducts a climatological numerical simulation study of the North Pacific focusing on the characteristics of deep-sea circulation using the self-developed σ-Z-σ hybrid coordinate MASNUM ocean circulation model. The σ-Z-σ hybrid coordinate system leverages the advantages of Z-coordinates and σ-coordinates, enabling flexible local grid refinement, making it an effective method to improve the accuracy of deep-sea circulation simulations. Three sets of gridded observational data, WOA18, MIMOC, and BOA-Argo, are used to evaluate the simulation results. Comparison results indicate that the simulated deep-sea temperature and salinity fields overall closely match the observational data. While there are some discrepancies in the simulated flow field compared to geostrophic currents derived from observations, features such as deep western boundary currents and anticyclonic circulation structures are more pronounced in the simulated results than in the observed monthly averages, closer to flow field observations in previous studies. The results of the analysis of deep-sea circulation characteristics based on numerical simulation show that there is no significant seasonal variation in the mean values of deep-sea temperature and salinity. However, there is a noticeable seasonal variation in the anomalies of temperature and salinity mean values, especially with a significant increase in temperature anomalies during the spring and summer seasons. The horizontal and meridional stream functions exhibit little variation between different months, indicating an inconspicuous seasonal change.

     

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