ERA5资料在天津沿海海陆风特征分析中的适用性评估  

Applicability assessment of ERA5 data in investigating characteristics of sea-land breeze over Tianjin coastal area

作　　者：朱志凡 曹洁[1,2,3] 邱晓滨 赵玮 ZHU Zhifan;CAO Jie;QIU Xiaobin;ZHAO Wei(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Meteorological Disasters,Ministry of Education,Nanjing 210044,China;School of Atmospheric Sciences,Nanjing University of Information Science&Technology,Nanjing 210044,China;Tianjin Key Laboratory for Oceanic Meteorology,Tianjin 300074,China;Tianjin Institute of Meteorological Sciences,Tianjin 300074,China;Beijing Weather Forecasting Center,Beijing 100089,China)

机构地区：[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,江苏南京210044 [2]气象灾害教育部重点实验室,江苏南京210044 [3]南京信息工程大学大气科学学院,江苏南京210044 [4]天津市海洋气象重点实验室,天津300074 [5]天津市气象科学研究所,天津300074 [6]北京市气象台,北京100089

出　　处：《海洋气象学报》2024年第3期37-49,共13页Journal of Marine Meteorology

基　　金：国家自然科学基金项目(91937301);江苏省双创博士项目(JSSCBS20220553);南京信息工程大学人才启动项目(2022r004)。

摘　　要：使用2018年3月—2021年2月欧洲中期天气预报中心ERA5资料和站点逐小时风向、风速等资料,采用常规方法筛选天津沿海海陆风事件,比较分析不同资料呈现出的海陆风起讫时间、持续时间、强度等指标表征的海陆风特征的年均和季节差异,以评估ERA5资料的适用性。结果表明:(1)2套资料四季分布对应较好,均能显示夏季海陆风日数最多这一基本特征;海风持续时间较陆风持续时间更长,年均强度高于陆风,最强均出现在春季。(2)年均差异主要表现为,站点资料显示的海风开始和结束时间呈弱双峰结构,陆风开始和结束时间均早于ERA5资料,平均海风和陆风持续时间短于ERA5资料。(3)季节差异主要表现为,ERA5资料显示陆风强度极小值出现在夏季,海风最长持续时间主要出现在秋季;站点资料显示陆风强度极小值在秋季,海风最长持续时间出现在春、夏两季。评估结果显示,较长时间序列ERA5资料与站点资料的相关性较高,适用于天津沿海海陆风特征研究。The European Centre for Medium-Range Weather Forecasts(ECMWF)Reanalysis v5(ERA5)and hourly observation data of wind direction and speed at meteorological stations from March 2018 to February 2021 are adopted to investigate the characteristics of the sea-land breeze over Tianjin coastal area.Firstly,conventional methods are used to identify the sea-land breeze events over Tianjin coastal area.Secondly,the interannual average and seasonal differences of sea-land breeze characteristics,such as the starting and ending time,duration and intensity,are analyzed and compared based on these two sets of data with the purpose to make an assessment of the applicability of ERA5 data.Similarities and differences are concluded as follows.(1)Both data are capable of revealing the fact that sea-land breeze events mostly occur in summer with similar distributions in all 4 seasons.The sea breeze lasts longer than the land breeze with stronger intensity.Both breezes reach their maximum intensities in spring.(2)There are interannual differences revealed by these two sets of data.Compared to results revealed by ERA5 data,the starting and ending time of the sea breeze revealed by the observation data have a weaker bimodal structure.The observed starting and ending time of the land breeze are ahead of their correspondences revealed by ERA5 data.The durations of both the sea breeze and the land breeze are shorter revealed by the observation data.(3)There are also seasonal differences.The minimum intensity of the land breeze revealed by ERA5 data appears in summer and the longest duration of the sea breeze appears in autumn.However,the minimum intensity of the land breeze revealed by the observation data appears in autumn and the longest duration of the sea breeze is in spring and summer.The assessment indicates that ERA5 data with the duration of three years,highly correlated with the observation data,are suitable for analyzing the sea-land breeze over Tianjin coastal area.

关 键 词：海陆风 天津沿海 ERA5资料 适用性 

分 类 号：P445[天文地球—大气科学及气象学]