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基于SODA3资料的西北太平洋海气边界层主要特征及相关性分析 被引量:2
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作者 王洪兵 张高英 +1 位作者 齐琳琳 刘健文 《海洋预报》 北大核心 2018年第1期64-79,共16页
基于SODA3.3.1海洋数据集2011—2015年逐月和逐5 d平均资料,对西北太平洋海域表层和次表层海温、混合层深度、风应力及风应力旋度的分布特征进行了分析,使用相关系数和相关矩方法分析了海温与混合层深度、风应力旋度的相关关系及变化特... 基于SODA3.3.1海洋数据集2011—2015年逐月和逐5 d平均资料,对西北太平洋海域表层和次表层海温、混合层深度、风应力及风应力旋度的分布特征进行了分析,使用相关系数和相关矩方法分析了海温与混合层深度、风应力旋度的相关关系及变化特征。结果表明:西北太平洋次表层海温在赤道附近存在冷中心;混合层深度呈北高南低分布,在黑潮延伸体以南有两个极大值中心;风应力秋冬季方向偏北且取值较大(冬季为全年最大),春季方向偏西,夏季方向偏南,两季风应力较小,西北太平洋表层海温与混合层深度在大部海域呈负相关,冬夏两季相关系数较高,在赤道附近相关系数下降,厄尔尼诺年下降趋势小,拉尼娜年下降趋势大,次表层海温与混合层深度大部呈正相关,黑潮流域呈负相关,相关区域主要位于15°N以北。表层海温与风应力旋度相关区域主要位于15°N以北,呈正相关,1—3月份和7—10月份相关性较高,次表层海温与风应力旋度相关区域分布零散无规律。 展开更多
关键词 西北太平洋 海温 混合层深度 风应力 相关关系
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Numerical Simulation on a Heavy Rainfall Event over Jiangxi Province
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作者 ZHOU Zu-gang JIANG Yong-qiang +2 位作者 zhang gao-ying zhang Wen-jun WANG Cheng-lin 《Meteorological and Environmental Research》 CAS 2012年第12期8-12,共5页
[Objective] The aim was to discuss the heavy rainfall formation mechanism and to reveal the causes of rainstorm. [Method] Based on the conventional observational data, a numerical simulation and diagnosis analyses hav... [Objective] The aim was to discuss the heavy rainfall formation mechanism and to reveal the causes of rainstorm. [Method] Based on the conventional observational data, a numerical simulation and diagnosis analyses have been carried on heavy rainfall event over Jiangxi province from 16 June to 20 June 2010, with a meso-scale REM model. The results showed that this rare rainstorm was a typical heavy rainfall over Meiyu front. The cold air flow behind the 500 hPa East Asia trough and 700 hPa North China vortex joined up the southwestern flow located in the northwest part of the strong and stable subtropical high, thus the cold air and warm air converged and maintained over the northern part of Hunan and Jiangxi province. Since the area that cold air and warm air joined up was stable and the southwestern warm and wet flow was abnormally strong, the vapor, dynamical, and thermodynamic conditions was leading to the trigger development of meso-scale convection systems. The extraordinary rainstorm was caused by the interaction of many factors such as strong vapor and convergence ascending motion, weak cold air activities in middle-levels, the strengthening of southwestern low-level jet, the formation and maintenance of southwestern vortexes, etc. The simulated precipitation of the high resolution model was very similar with the observational rainfall. The model had a good predictive skill for the location, intensity and center of heavy rainfall. By diagnosing the physical variables, it found that the distribution characteristic of the physical variables had an obvious indication for precipitation forecast. [Conclusion] The study provided reference to improve rainstorm forecast. 展开更多
关键词 Heavy rainfall Numerical simulation Diagnosis analysis Jiangxi Province China
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