| 北极扬马延岛大气边界层高度的气候特征分析 |
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| 引用本文： | 张祥,张叶晖,韩靖博,张乐,史婉蓉.北极扬马延岛大气边界层高度的气候特征分析[J].极地研究,2018,30(2):132-139. |
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| 作者姓名： | 张祥 张叶晖 韩靖博 张乐 史婉蓉 |
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| 作者单位： | 南京信息工程大学 |
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| 基金项目： | 江苏省高等学校大学生创新创业训练计划项目(201610300016Z)、江苏省自然科学基金项目(BK20161531)、淮河流域气
象开放研究基金(HRM201604)以及南京信息工程大学本科生优秀毕业论文(设计)支持计划项目(2018BSZC033)资助 |
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| 摘 要： | 基于1973—2015年间的全球综合无线电探空资料(IGRA),采用总体理查逊数(Bulk Richardson Number)方法,分析了北极扬马延岛43年间的大气边界层高度变化特征,并对其多年月均大气边界层高度变化以及年均大气边界层高度变化进行深入分析探讨。结果显示,扬马延岛白天对流边界层高度高于夜晚稳定边界层高度,夏季多年月均大气边界层高度远低于冬春季节的高度,夏季平均高度仅为262 m,而冬春季节高度在600 m附近。大气边界层高度的变化与地面相对湿度的变化呈现较好的反相关关系。由于受到墨西哥湾暖流的影响,岛屿全年温差较小,夏季的相对湿度较大,导致潜热通量较多,抑制了边界层内的对流过程,造成夏季大气边界层高度较低。此外,其年均高度在1973—1988年间出现波动下降,而后在1988—1995年快速上升,最后于1995—2015年间变化平稳。
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| 关 键 词： | 大气边界层高度 扬马延岛 总体理查逊数 |
| 收稿时间： | 2017-11-01 |
Climatological characteristics of planetary boundary layer height at Jan Mayen,Arctic |
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| Zhang Xiang,Zhang Yehui,Han Jingbo,Zhang Le,Shi Wanrong.Climatological characteristics of planetary boundary layer height at Jan Mayen,Arctic[J].Chinese Journal of Polar Research,2018,30(2):132-139. |
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| Authors: | Zhang Xiang Zhang Yehui Han Jingbo Zhang Le Shi Wanrong |
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| Abstract: | Based on 43 years’ data of twice-daily radiosonde observations, this study investigated the temporal
variability of the planetary boundary layer height (PBLH) at Jan Mayen, Norway, based on the Bulk
Richardson Number method. It was found that the PBLH during daytime was higher than at night for most
months. In addition, the monthly averaged PBLH in summer (around 262 m) was found much lower than in
spring or winter (about 600 m). The PBLH variations showed good anticorrelation with surface relative humidity.
Because of the influence of the Gulf Stream, the annual temperature difference at the Jan Mayen station
is quite small and the surface temperature shows little seasonal variation. Surface relative humidity exhibits
considerable seasonal variation, with a maximum value in summer and a minimum value in winter.
The higher humidity in summer causes higher latent heat flux that restrains the convective process in the
boundary layer, which leads to the lower summer PBLH. The long-term changes in PBLH at the studied station
also revealed some interesting results. The annual mean PBLH decreased from 1973 to 1988, increased
rapidly between 1988 and 1995, and then fluctuated between 500 and 600 m after 1995. |
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| Keywords: | Planetary boundary layer height Jan Mayen Bulk Richardson Number |
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