In order to provide scientific advice for wintertime agricultural production in guangdong province , we analyzed and studied the yearly variations and spatial distribution of the winter chilling damage in guangdong for the latest 44 years by using mean daily temperature and daily minimum temperature of 22 meteorological stations in guangdong from december , 1957 to february , 2001 用广东省22个分布较均匀的代表站1957年12月? 2001年2月冬季( 12月? 2月)逐日平均气温和最低气温资料，对广东省近44年来冬季寒害的发生规律及地域分布特征进行了分析和研究，为广东省冬季农业生产提供科学指导。
From the numerical modeling results , it can be found that there is a clockwise gyre in the middle part of bohai sea , whether in wintertime or in summertime . in summer , the clockwise gyre corresponding to the high - temperature and low - density center in the middle bohai sea is mainly dominated by the density circulation . and in winter , it is mainly dominated by the wind stress curl 通过数值模拟结果发现，在渤海中部，无论冬季还是夏季，都存在一个顺时针的涡旋运动，夏季，对应于渤海中部的高温低密中心，其流场主体部分呈顺时渤海冬夏季环流特征及变异的初步研究针向旋转，这主要是密度环流占优的结果，而冬季的顺时针向的旋转，主要是海面风应力旋度影响的结果。
Beijing four seasons real estate trade fair is composing of four large - scale , high - standard and professional real estate fairs , including beijing springtime real estate trade fair , beijing summertime real estate trade fair , beijing autumntime real estate trade fair , and beijing wintertime real estate trade fair 北京四季房展由享誉京城的北京春季房地产展示交易会、北京夏季房地产展示交易会、北京秋季房地产展示交易会和北京冬季房地产展示交易会四个大规模、高标准的房地产专业展会组成。
Therefore , the physical mechanics of ao also presents seasonal variability . while thermal forcing plays an important role in the process of summertime ao formation and maintenance , wintertime ao is subject to the dynamic process . this is probably the radical cause of the seasonal discrepancy of ao 因此热力强迫作用在夏季北极涛动的形成和维持机制中占重要地位，而冬季北极涛动的维持机制主要是动力作用的结果，热力作用只在对流层低层起作用，这也是二者空间模态和结构差异的主要原因。
The system is able to efficiently increase temperature and meet crop requirement of temperature for yield . in researching and designing solar energy conserving system in soil for active greenhouse , it adopts instrument of rhlog , tests temperature of six layers to soil temperature , and draws various curve of temperature . it shows the system can efficiency increase soil temperature and reduces change range of temperature in greenhouse in wintertime 在研究和设计主动式温室太阳能地下蓄热系统中，采用温度自记仪器，测试了室温及土壤中六个不同深度的温度数据，绘制了相关温度变化曲线，该曲线表明了主动式温室太阳能地下蓄热系统能有效提高冬季温室土壤的温度，并且减小了日温变化幅度。
Based on the two ctd data sets from the cruise of the summertime in 2000 and wintertime in 2001 in bohai sea and the collected historic observed thermohaline data , we analyse systemically the distributional characteristics of temperature , salinity and density in wintertime and summertime in the bohai sea and the results reveal that the current hydrologic characteristics of the bohai sea have some obvious variances relative to the previous research results . in summer there are three low - temperature centers in the middle - layer and underlayer of the middle parts of the bohai strait , liaodong bay - mouth and bohai bay - mouth , but there is a uniform high - temperature center in the middle part of the bohai sea . in winter the isotherms extend westward and northward to the bohai sea from the warm core of the bohai strait and a cold - water tongue off the qinhuangdao spreads southeastward out , so the saddle - like isotherm pattern is formed in the middle part of the bohai sea 利用2000年夏季和2001年冬季渤海两次ctd资料和以前收集的渤海温盐调查资料，分析了渤海冬、夏季温盐密度的分布特征，结果表明，渤海现有的水文特征与以往研究结果相比发生了明显的变异：夏季在渤海海峡、辽东湾口和渤海湾口中部中、下层存在三个低温中心，在渤海中部则出现一个上下均匀一致的高温中心；冬季等温线以渤海海峡暖中心向西和向北两个方向伸入渤海，而从秦皇岛外海有一冷水舌向东南方向伸展，在渤海中部海域形成“马鞍状”等温线结构。
