| 摘要: |
| 基于2004-2018年的地面观测数据和大气再分析数据，探究了西太平洋副热带高压（简称西太副高）对黄海夏季海雾年际变化的影响。结果表明：1）黄海夏季海雾雾日数存在明显的年际变化；多雾年偏南水汽通量输入可以达到少雾年的2.54倍，水汽通量净收支约是少雾年的2.76倍。2）在对流层中低层，多雾年的水汽输送存在2个通道，分别源自南海与台湾岛东南的西太平洋；少雾年只存在一个源自南海的水汽输送通道，其位置与多雾年基本一致但水汽输送量略小一些。3）雾日数与西太副高的面积、强度指数呈显著负相关（相关系数分别为-0.47和-0.54）；少雾年面积、强度指数分别为多雾年的3.2倍和4.7倍；多雾年西太副高的位置较少雾年向东北偏移约4.8°经纬距（西太副高西脊点与脊线交点的位置变化），东海以东存在一个深厚反气旋，有利于水汽从台湾岛东南的西太平洋海域输入黄海，这是多雾年的主要成因。 |
| 关键词: 黄海 夏季海雾 年际变化 水汽输送通道 西太平洋副热带高压 |
| DOI：10.11759/hykx20201026001 |
| 分类号:P466;P468.0+28 |
| 基金项目:国家重点研发计划重点专项（2017YFC1404200）；国家自然科学基金（42075069）；山东省重点研发计划项目（2019GSF111066） |
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| Influence of the western Pacific subtropical high on the interannual variation of summer sea fog over the Yellow Sea |
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LIU Shu1,2, GAO Shan-hong1,2
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1.College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;2.Key Laboratory of Physical Oceanography(Ocean University of China), Ministry of Education, Qingdao 266100, China
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| Abstract: |
| Based on surface observations and atmospheric reanalysis from 2004 to 2018, the influence of western Pacific subtropical high (WPSH) on the interannual variation of summertime sea fog days (SSFD) over the Yellow Sea was studied. The results are outlined as follows:(1) SSFD over the Yellow Sea has obvious interannual variability. The input of water vapor flux from southerlies for the years with more foggy days (YM) can reach 2.54 times of that for the years with less foggy days (YL), respectively. Water vapor flux net budgets in YM are 2.76 times of that in YL; (2) In the middle and lower troposphere, two channels of water vapor transport in YM clearly exist, originating from the South China Sea and an area of the Western Pacific southeast to Taiwan Island (AWP). There is only one channel in YL, i.e., the South China Sea channel, which is highly consistent with that in YM but with slightly weaker water vapor transport; and (3) SSFD is negatively correlated with both area and intensity index of the WPSH (correlation coefficient is -0.47 and -0.54, respectively). The area and intensity index in YL are 3.2 times and 4.7 times, respectively, of those in YM. The location of the WPSH in YM is shifted to the northeast by a distance of ~4.8°, and there appears a deep anticyclone relatively with YL over the area eastern to the East China Sea, leading water vapor to enter the Yellow Sea from AWP and very likely promote the occurrence of YM. |
| Key words: Yellow Sea summer sea fog interannual variation water vapor transport channel western Pacific subtropical high |
