| 与夏季北太平洋副热带中尺度海洋涡旋相联系的海气关系 |
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| 引用本文： | 徐全倩,徐海明,马静.与夏季北太平洋副热带中尺度海洋涡旋相联系的海气关系[J].大气科学,2018,42(6):1191-1207. |
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| 作者姓名： | 徐全倩 徐海明 马静 |
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| 作者单位： | 1.南京信息工程大学气象灾害预报预警与评估协同创新中心/气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室, 南京 210044 |
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| 基金项目： | 国家自然科学基金项目41575077、41490643，江苏省333高层次人才培养工程BRA2015290，江苏高校优秀学科建设工程项目（PAPD） |
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| 摘 要： | 采用高分辨率卫星和再分析资料，利用涡旋探测技术、滤波和合成分析等方法，对夏季北太平洋副热带地区中尺度海洋涡旋与大气的耦合关系进行了分析。结果表明:在日时间尺度上，海洋涡旋的海表温度（Sea SurfaceTemperature，简称SST）与海表风速之间不仅存在同位相的正相关关系，还存在反位相的负相关关系，即在涡旋这种中尺度上既存在海洋对大气的强迫，也存在大气对海洋的强迫。海表风速与SST同位相时，对暖（冷）涡来说，向上（下）的净热通量增强，云和降水增多（减少）；其海水温度异常和海流旋度较强，暖（冷）涡较为深厚，一定程度上表明了海洋对大气的强迫。海表风速与SST反位相时，对暖（冷）涡而言，当其处在正（负）位势高度异常、中低层相对湿度较小（大）、气温较高（低）的大气配置下，海表风速较小（大）；同时向下（上）净热通量增强，云和降水减少（增多）；涡旋海水温度异常和海流旋度较弱，这种暖（冷）涡较为浅薄；表明晴空（阴雨）条件下有利于暖（冷）涡的维持，一定程度上反映了大气对海洋的强迫作用。
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| 关 键 词： | 北太平洋副热带 中尺度海洋涡旋 海气关系 |
| 收稿时间： | 2017/6/14 0:00:00 |
Air-Sea Relationship Associated with Mesoscale Oceanic Eddies over the Subtropical North Pacific in Summer |
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| XU Quanqian,XU Haiming and MA Jing.Air-Sea Relationship Associated with Mesoscale Oceanic Eddies over the Subtropical North Pacific in Summer[J].Chinese Journal of Atmospheric Sciences,2018,42(6):1191-1207. |
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| Authors: | XU Quanqian XU Haiming and MA Jing |
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| Institution: | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC), Nanjing University of Information Science & Technology, Nanjing 210044,Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC), Nanjing University of Information Science & Technology, Nanjing 210044;National Demonstration Center for Experimental Atmospheric Science and Environmental Meteorology Education, Nanjing University of Information Science & Technology, Nanjing 210044 and Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC), Nanjing University of Information Science & Technology, Nanjing 210044 |
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| Abstract: | A suite of high-resolution satellite and reanalysis data are used to investigate the coupling relationships between oceanic eddies and atmosphere over the subtropical North Pacific in the summer by means of eddy detection scheme and filtering and composite analysis. Results show that there are both positive and negative correlations between sea surface temperature (SST) and wind speed at 10 m over eddies on a daily time scale, which indicates that not only oceanic but also atmospheric forcing exists in mesoscale oceanic eddies. When SST is in phase with sea surface wind speed for warm (cold) eddies, upward (downward) net heat flux enhances, total cloud cover and precipitation increase (decrease); the sea water temperature anomalies and current curls enhance, and thus warm (cold) eddies are relatively stronger. All of these changes indicate the ocean-to-atmosphere forcing to a certain extent. In addition, when SST is in opposite phase with sea surface wind speed for warm (cold) eddies, downward (upward) net heat flux enhances, total cloud cover and precipitation decreases (increases) with positive (negative) anomalies of geopotential height and air temperature at the low-middle levels, and negative (positive) anomalies of relative humidity. Moreover, the sea water temperature anomalies and current curl are weakened, and warm (cold) eddies are relatively weaker. All of these are conducive to the maintenance of warm (cold) eddies under clear (rainy) sky, indicating the atmosphere-to-ocean forcing to a certain extent. |
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| Keywords: | Subtropical North Pacific Mesoscale oceanic eddies Air-sea relationship |
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