| 夏季北极太平洋扇区和白令海对流层结构分析 |
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| 引用本文： | 殷嘉晗,张林.夏季北极太平洋扇区和白令海对流层结构分析[J].海洋预报,2020,37(3):72-81. |
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| 作者姓名： | 殷嘉晗 张林 |
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| 作者单位： | 国家海洋环境预报中心,北京100081;国家海洋环境预报中心,北京100081 |
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| 摘 要： | 利用我国第六次—第九次北极科学考察雪龙船走航探空数据,计算北极太平洋扇区和白令海的夏季对流层高度,分析对流层内的风速、温度、水汽廓线,从而确定对流层结构,并分析各要素的垂直分布和经向分布特征。结果表明:夏季北极太平洋扇区和白令海的递减率对流层顶、冷点对流层顶平均值分别为10 003 m、10 116 m,对流层高度随纬度增加而降低。夏季北极大气对流层低层和对流层顶存在逆温,对流层顶的逆温高度和厚度随纬度增加而降低。大气可降水量与纬度呈负相关,且集中于对流层中低层。近地面的风速受地表摩擦力的影响较明显,对流层内的风速随高度增加而增大,高空急流的强度和高度随纬度增加而减小,风廓线和急流易受天气尺度过程的影响。研究结果揭示了夏季北极太平洋扇区和白令海的对流层结构,并可用于检验数值预报模式对北极大气垂直结构的预报效果、评估再分析资料描述北极大气垂直结构的能力。
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| 关 键 词： | 北极太平洋扇区和白令海 递减率对流层顶 冷点对流层顶 对流层结构 逆温 急流 可降水量 |
Analysis of the tropospheric structure over the Arctic Pacific sector and Bering Sea in summer |
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| YIN Jia-han,ZHANG Lin.Analysis of the tropospheric structure over the Arctic Pacific sector and Bering Sea in summer[J].Marine Forecasts,2020,37(3):72-81. |
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| Authors: | YIN Jia-han ZHANG Lin |
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| Institution: | (National Marine Environmental Forecasting Center,Beijing 100081 China) |
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| Abstract: | Based on the sounding data collected by sailing"Xuelong"during the 6 th-9 th Chinese National Arctic Research Expedition, the tropopause height over the Arctic Pacific sector and Bering Sea in summer is calculated and the profiles of wind speed, temperature and moisture within the troposphere are analyzed in this paper.Moreover, we reveal the structure of the troposphere as well as the characteristics of vertical and meridional distribution of each variables. The lapse rate tropopause(LRT) and cold point tropopause(CPT) over the Arctic Pacific sector and Bering Sea in summer are 10 003 m and 10 116 m on average, respectively. The tropopause heights deceases with latitude. Inversion layers can be found in the low troposphere and tropopause, and the height and thickness of the inversion later in tropopause decreases with latitude increasing. The precipitable water vapor shows a negative correlation with latitude, which concentrates in the mid-low troposphere. The surface wind speed is significantly influenced by the surface friction, and the wind speed increases in high altitude within the troposphere. Meanwhile, the strength and elevation of upper jet stream decreases with latitude,and the wind profiles and jet stream is prone to the influence of synoptic systems. The tropospheric structure over the Arctic Pacific sector in summer revealed in this study could be used to verify the accuracy of numerical models in forecasting the vertical atmospheric structures and to assess the capability of reanalysis data in describing the vertical atmospheric structures in the Arctic. |
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| Keywords: | Arctic Pacific sector and Bering Sea lapse rate tropopause cold point tropopause tropospheric structure inversion layers jet stream precipitable water vapor |
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