丁菊丽,梁志超,费建芳,吕庆平,赵小峰. 2021. 一次黑潮海洋锋强迫下的蒸发波导突变性与非均匀性的观测与模拟研究[J]. 气象学报, 79(6):1049-1062, doi:10.11676/qxxb2021.068
一次黑潮海洋锋强迫下的蒸发波导突变性与非均匀性的观测与模拟研究
A study of abrupt changes and inhomogeneity of evaporation ducts in response to the Kuroshio sea surface temperature front based on observations and simulations
投稿时间:2020-11-05  修订日期:2021-09-26
DOI:10.11676/qxxb2021.068
中文关键词:  蒸发波导  大气波导  黑潮  海洋锋  电磁波传播
英文关键词:Evaporation duct  Atmospheric duct  Kuroshio  SST front  Electromagnetic wave propagation
基金项目:国家自然科学基金项目(41775017、41775027)
作者单位E-mail
丁菊丽 国防科技大学气象海洋学院长沙410003  
梁志超 国防科技大学气象海洋学院长沙410003
96746部队库尔勒841000 
 
费建芳 国防科技大学气象海洋学院长沙410003 feijf@sina.com 
吕庆平 91001部队北京100143  
赵小峰 国防科技大学气象海洋学院长沙410003  
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中文摘要:
      蒸发波导是影响海上雷达系统探测性能的主导机制,海表温度(SST)锋带来的蒸发波导非均匀性和突变性具有重要的研究价值。2018年春季航次“海气相互作用观测试验”,曾两次穿越黑潮海域获取了珍贵的观测资料。在此基础上,结合欧洲中期天气预报中心(ECMWF)再分析资料(ERA-Interim)和HYSPLIT(Hybrid Single Particle Lagrangian Integrated Trajectories)气块轨迹溯源,分离出两个重要的走航观测时段。S1段(持续约21 h)气流从暖海水区吹向冷海水区,以稳定层结为主,其间因黑潮海洋锋的存在,气流由黑潮主体的暖水区吹向大陆冷海区时,形成具有强逆温层的海洋边界层,并伴随海雾的生成,导致此处蒸发波导高度突降为0。此后为持续近66 h的S2段,气流由冷海水区吹向暖海水区,以近中性弱不稳定层结为主,蒸发波导高度基本维持在12 m高度。数值模拟结果表明,模拟时段内的黑潮海洋锋区,蒸发波导高度突变性和非均匀性始终存在,且伴随暖海水吹向冷海水的锋区突变性更强。黑潮海洋锋对蒸发波导的这种天气尺度强迫作用的加强与层结稳定度的突变和海雾的生成有关。
英文摘要:
      Evaporation ducting is the dominant mechanism affecting the detection performance of marine radar systems. The inhomogeneity and abrupt changes of the evaporation ducts caused by sea surface temperature (SST) front remain an important research topic. During the Air-Sea Interaction Survey (ASIS) in the spring of 2018, the observation vessel passed through the Kuroshio SST front twice and obtained precious observational data. Based on these data and combined with the European Centre for Medium-Range Weather Forecasts reanalysis data (ERA-Interim) and the Hybrid Single Particle Lagrangian Integrated Trajectories (HYSPLIT), two important periods are distinguished and highlighted. The S1 segment, which lasted for 21 h, was dominated by a stable condition with air flowing from warmer water to colder water. During this period, the airflow passed from the warmer Kuroshio water area to the colder shelf water area, leading to a marine inner boundary layer with strong temperature inversion and the formation of sea fog. Meanwhile, the evaporation duct height (EDH) suddenly dropped to zero. The S2 segment lasted for almost 66 h and was dominated by a near neutral to slightly unstable condition with the air flowing from the colder water area to the warmer water area and the model-derived EDH was about 12 m. Numerical simulations show that during the simulation period, the inhomogeneity and abrupt changes of the EDH over the Kuroshio SST front maintained, and the abrupt changes were more robust over areas where warmer water flowed to colder water. This enhanced synoptic forcing of the Kuroshio SST front on the evaporation ducts is related to abrupt stratification change and sea fog formation.
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