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| 北极低空急流和低层逆温特征观测分析 | |
| 引用本文： | 程刚,高志球,郑友飞,代成颖,周明煜.北极低空急流和低层逆温特征观测分析[J].气候与环境研究,2013,18(1):23-31. |
| 作者姓名： | 程刚 高志球 郑友飞 代成颖 周明煜 |
| 作者单位： | 1. 南京信息工程大学环境科学与工程学院,南京 210044;中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京 100029 2. 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京,100029 3. 南京信息工程大学环境科学与工程学院,南京,210044 4. 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京 100029;中国极地研究中心,上海 200136 |
| 基金项目： | 国家重点基础研究发展计划项目2011CB403501,国家自然科学基金项目40930848、40975009、40906023 |
| 摘 要： | 利用北冰洋冰表面热量平衡计划1997年10月中旬至1998年10月上旬的探空气球探测结果,分析了北极地区近地层逆温和低空急流特征.结果表明,96％的观测时次(11:15和23:15,协调世界时)出现近地层逆温,其中22％的逆温为贴地逆温,70％的逆温厚度在250～850 m之间,冬半年贴地逆温发生频率、逆温层厚度和逆温层内的温度变化都明显要大于夏半年.全年间低空急流出现频率为41％,平均高度为520 m,最大频率出现在150 m附近,70％的急流出现在600m高度以下.急流平均风速为10.6m·s-1,风速在4～13 m·s-1范围内的急流约占总数的75％,东和东南方向为全年急流的主导风向.根据对急流核和地面风速之间转换角分布的分析,惯性震荡可能是北极低空急流的主要成因. |
| 关 键 词： | 逆温 低空急流 北极 |
| 收稿时间： | 1/6/2011 12:00:00 AM |
| 修稿时间： | 2012/5/10 0:00:00 |
A Study on Low-level Jets and Temperature Inversion over the Arctic Ocean by Using SHEBA Data |
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| CHENG Gang,GAO Zhiqiu,ZHENG Youfei,DAI Chengying and ZHOU Mingyu.A Study on Low-level Jets and Temperature Inversion over the Arctic Ocean by Using SHEBA Data[J].Climatic and Environmental Research,2013,18(1):23-31. | |
| Authors: | CHENG Gang GAO Zhiqiu ZHENG Youfei DAI Chengying and ZHOU Mingyu |
| Institution: | Department of Environment Science and Technology, Nanjing University of Information Science and Technology, Nanjing 210044;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;Department of Environment Science and Technology, Nanjing University of Information Science and Technology, Nanjing 210044;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;Polar Research Institute of China, Shanghai 200136 |
| Abstract: | Utilizing GPS sounding data collected during the Surface Heat Budget of the Arctic Ocean campaign over the period of one year (SHEBA, October 1997-October 1998), the authors characterized the boundary layer inversion and low-level jet over the Arctic Ocean. The results showed that 96% of the soundings (1115 UTC and 2315 UTC) had near-surface inversion layers, where 22% were surface-based and 70% were between 250 m and 850 m. During the winter months, the frequency of the surface-based inversion, the inversion depth, and the temperature change in the inversion layer were stronger than that during the summer months. During the year, the low-level jets occurred with a frequency of 41% and their average height was 520 m. The jets appeared mostly around 150 m, and 70% were below 600 m. The mean speed of the jets was 10.6 m·s-1 and the predominant wind direction was east and northeast; 75% of the wind speeds recorded ranged between 4 m·s-1 and 13 m·s-1. The analysis of the turning angle distribution between the jet core and the ground wind indicated that inertial oscillation was the main cause of the low-level jet in the Arctic region. |
| Keywords: | Inversions Low-level jet Arctic |
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