双月刊

ISSN 1006-9895

CN 11-1768/O4

东亚-西北太平洋海平面气压场的动力特征分析
作者:
作者单位:

1.成都信息工程大学;2.中国海洋大学 物理海洋教育部重点实验室;3.北京师范大学 地表过程与资源生态国家重点实验室

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基金项目:

国家自然科学基金 面上项目41975070


Dynamic Properties of Sea Level Pressure Field in East Asia-Northwest Pacific
Author:
Affiliation:

1.Chengdu University of Information Technology;2.Key Laboratory of Physical Oceanography MOE China,Ocean University of China;3.State Key Laboratory of Earth Surface Processes and Resource Ecology

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    摘要:

    东亚-西北太平洋地区的海平面气压(sea-level pressure,SLP)直接反映了低层大气的环流特征,其动力特征对于大气环流形势,气压系统的演变和天气、气候系统的发展等都有显著的影响。因此,深入分析东亚-西北太平洋地区海平面气压场的时空演变特征,对于提高我国的天气和气候预报具有重要意义。为了从非线性动力学的角度进行深入研究,文中使用了一种新方法来定量估算海平面气压吸引子的两个瞬时指标:瞬时维度和瞬时稳定度。瞬时维度表征了吸引子轨道在局部空间上的离散程度,瞬时稳定度则表征了轨道在局部时间上的稳定程度,它们共同反应了海平面气压吸引子的瞬时(逐日)动力特性。本文利用不同大小的指标值与海平面气压场的对应关系,筛选出了东亚-西北太平洋地区逐日海平面气压场的不同时空特征。主要结论为:(1)海平面气压吸引子的两个指标都是低值时,对应逐日环流场的空间特征表现为:气压结构单一,通常有几个强大的高低气压中心东西对峙;时间特征表现为:环流模态可以稳定的持续10天左右。(2)相反,当两个指标都是高值时,逐日环流场的空间特征表现为:多个弱的气压中心同时存在,空间结构混乱;时间特征为:环流场极不稳定,持续性仅在1天左右。(3)此外,发现东亚-西北太平洋海平面吸引子的两个指标具有一致的年代际变化趋势:从上世纪70-90年代呈现明显的下降趋势,90年代末快速上升,2000年后波动变化。

    Abstract:

    The sea-level pressure (SLP) in the East Asia-Northwest Pacific region directly reflects the circulation characteristics of the lower atmosphere, and its dynamical characteristics have significant effects on the atmospheric circulation situation, the evolution of the pressure system and the development of weather and climate systems. Therefore, an in-depth analysis of the spatial and temporal evolution characteristics of the sea level pressure field in the East Asia-Northwest Pacific region is of great significance to improve the weather and climate forecasting in China. In order to investigate the dynamical characteristics of the daily sea-level pressure field from the perspective of nonlinear dynamics, a new method is used to quantitatively estimate two instantaneous indicators of the sea-level pressure attractor: the instantaneous dimension and the instantaneous stability. The instantaneous dimension characterizes the dispersion of the attractor orbit in local space, and the instantaneous stability characterizes the stability of the orbit in local time, which together characterize the instantaneous (daily) dynamical properties of the sea-level baroclinic attractor. In this paper, different spatial and temporal characteristics of the sea-level pressure field in the East Asia-Northwest Pacific region are screened by the correspondence between the indicator values of different sizes and the daily sea-level pressure circulation field. The main conclusions are: (1) When both indicators of sea-level pressure attractor are low, the spatial characteristics of the corresponding circulation field are as follows: the pressure structure is single, usually with several strong high and low-pressure centers facing each other at east-west direction, while the time characteristics show that the circulation mode can be stable for about 10 days. (2) On the contrary, when both indicators are high, the spatial characteristics of the circulation field are as follows: multiple weak pressure centers exist at the same time, with a chaotic spatial structure. As for the temporal characteristics, the circulation field is extremely unstable, and the duration is only about 1 day. (3) The two indicator anomalies in the East Asia-Northwest Pacific region have a consistent interdecadal trend, both showing a clear downward trend from the 1970s to 1990s, a rapid rising trend in the late 1990s and fluctuating changes after 2000.

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  • 收稿日期:2020-12-29
  • 最后修改日期:2021-03-23
  • 录用日期:2021-03-30
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