| 王凯悦1，2，张苏平1，2，薛允传3，田翔宇1，2，杨柳1，2.夏季低压控制下黄海西北部海域海雾发生气象条件合成分析[J].海洋气象学报,2018,38(3):47-56 |
| 夏季低压控制下黄海西北部海域海雾发生气象条件合成分析 |
| Synthetic analysis of meteorological elements for sea fog events over the northwestern Yellow Sea under low pressure control in summer |
| 投稿时间：2018-05-22 修订日期：2018-07-02 |
| DOI：10.19513/j.cnki.issn2096-3599.2018.03.006 |
| 中文关键词: 低压控制下海雾 高压控制下海雾 黄海西北部海域 合成分析 瞬变扰动 |
| 英文关键词: sea fog under low pressure control sea fog under high pressure control the northwestern Yellow Sea synthetic analysis transient disturbance |
| 基金项目:国家自然科学基金项目（41576108，41605006）；山东省自然科学基金项目（ZR2016DB26）； 青岛市科技民生计划项目（15-92-114-NSH） |
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| 中文摘要: |
| 利用瞬变扰动分析的原理，提供了一个可以客观判定海雾发生时天气类型的方法。在分类结果的基础上，对环流形势、散度和垂直速度以及温度湿度的垂直廓线等进行合成分析，得到低空（1 000 hPa）为低压扰动下发生海雾（L型海雾）的环流和物理量场基本特征，并与高压控制下海雾（H型海雾）进行对比，结果表明：1）L型海雾位势高度负异常扰动主要表现在低层，其平均值为-65.66 gpm，向上逐渐减弱；2）L型海雾在发生时其逆温强度小于H型海雾，雾层较厚，雾层上空湿度仍然比较大，而H型海雾雾层上空有比较明显的干层；3）L型海雾在垂直方向上的分布具有三层结构，第一层1 000～950 hPa为辐合伴有弱上升和下沉运动，第二层950～850 hPa为辐散伴有弱下沉运动，第三层850～500 hPa为逐渐加强的上升运动；H型海雾为两层结构，1 000 hPa为辐散伴有弱的上升和下沉运动,950～500 hPa为一致的下沉运动；4）概率密度统计分析进一步定量表明了L型和H型海雾发生时垂直运动以及相对湿度在各层中的分布情况。这些结论对黄海西北部夏季低压环流形势下海雾的预报提供了重要参考。 |
| 英文摘要: |
| Based on the principle of transient disturbance analysis, a method is provided to objectively determine the weather pattern owing to the sea fog. On the basis of classification results, a synthetic analysis is conducted of the circulation situation, divergence, vertical velocity field, and the vertical profiles of temperature and humidity. The basic characteristics of the circulation and physical field of the sea fog (L type sea fog) under low pressure control at 1 000 hPa are obtained, which are compared with those of the sea fog (H type sea fog) under high pressure control. The results are as follows: 1) The negative anomaly disturbance of L type sea fog's geopotential height is mainly manifested at the low layer, whose average value is -65.66 gpm, and is gradually weakened upward; 2) When L type sea fog occurs, its temperature inversion structure is weaker than that of H type sea fog, the layer is thicker, and the upper layer has higher relative humidity, while the upper layer of H type sea fog is relatively dry; 3) L type sea fog has a structure of three layers at the vertical direction. The first layer is convergence accompanied by weak ascending and sinking motion from 1 000 hPa to 950 hPa, the second layer is divergence accompanied by weak sinking motion from 950 hPa to 850 hPa, and the third layer has gradually strengthened ascending motion from 850 hPa to 500 hPa. However, H type sea fog has a structure of two layers. It is divergence accompanied by weak ascending and sinking motion at 1 000 hPa and has consistent sinking motion from 950 hPa to 500 hPa. 4) The statistical analysis of probability density further quantitatively show the vertical movement of L and H type sea fog and the distribution of relative humidity at each layer. These conclusions provide an important reference for forecasting the sea fog over the northwestern Yellow Sea under low pressure circulation in summer. |
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