利用丹东地区2011～2014年4个观测站逐月气温极值,分析了近4年最高、最低气温以及日较差的南北差异的四季变化特征,对于南北差异明显、差异变化较大的春季最高气温和冬季最低气温不同高低空天气形势进行对比分析。结果表明,丹东地区平...利用丹东地区2011～2014年4个观测站逐月气温极值,分析了近4年最高、最低气温以及日较差的南北差异的四季变化特征,对于南北差异明显、差异变化较大的春季最高气温和冬季最低气温不同高低空天气形势进行对比分析。结果表明,丹东地区平均最高气温春季、夏季在凤城最高,丹东和宽甸的最高气温持平,东港最低;秋季和冬季东港最高,其次是丹东和凤城,宽甸最低。丹东地区平均最低气温为东港、丹东、凤城、宽甸自南向北递减,南北差异较小的为夏季,其次是春季、秋季,差异最大的是冬季。天气形势：春季最高气温北部比南部偏高5℃以上,高空多处于低涡底部或低压槽底,850 h Pa风场为偏西气流控制,地面为弱气压场控制;春季最高气温北部比南部偏低,高空多处于低涡后部或槽后,850 h Pa风场为偏北气流控制,地面为高压前部,地面有云或无云大风,风向为偏北风;冬季最低气温北部比南部偏低8℃以上,高空为涡后或槽后,850 h Pa风场为西北气流或偏北气流控制,地面辽宁北部为地形槽,长白山地区为高压场;冬季最低气温北部比南部略低,高空为涡前或槽前,850 h Pa为西南气流控制,地面受低压或高压后部偏南气流控制,云量较多。展开更多
Using the daily maximum and minimum temperature dataset from 128 stations from 1960 to 2004 in Northwest China,daily extreme high temperature(EHT)and extreme low temperature(ELT)thresholds were deter-mined by centesim...Using the daily maximum and minimum temperature dataset from 128 stations from 1960 to 2004 in Northwest China,daily extreme high temperature(EHT)and extreme low temperature(ELT)thresholds were deter-mined by centesimal method for different stations at first,then yearly EHT and ELT events were counted up in differ-ent stations,and the characteristics of their spatio-temporal distribution were diagnosed at last.The study drew follow-ing conclusions:1)The consistent anomaly distribution characteristic was the most important mode of the EHT and ELT events in Northwest China.2)The spatial distribution of the EHT and ELT events can be divided into five sub-regions,namely,the north of Qinghai and west of Gansu,the north of Xinjiang,the south of Xinjiang,the east of Northwest China and the south of Qinghai.3)The EHT events showed remarkable increasing trend in all of five sub-regions,but only in the north of Qinghai and west of Gansu area,sudden change phenomenon occurred;the ELT events showed decreasing trend in all of five sub-regions,and sudden change phenomenon occurred in Northwest China except for south of Qinghai.4)In all of five sub-regions the EHT events showed remarkable 12-14yr period os-cillation,and the ELT event showed significant 13-15yr and 7-8yr period oscillation.5)The EHT and ELT events displayed remarkable positive and negative responses to regional warming of Northwest China respectively.展开更多
文摘利用丹东地区2011～2014年4个观测站逐月气温极值,分析了近4年最高、最低气温以及日较差的南北差异的四季变化特征,对于南北差异明显、差异变化较大的春季最高气温和冬季最低气温不同高低空天气形势进行对比分析。结果表明,丹东地区平均最高气温春季、夏季在凤城最高,丹东和宽甸的最高气温持平,东港最低;秋季和冬季东港最高,其次是丹东和凤城,宽甸最低。丹东地区平均最低气温为东港、丹东、凤城、宽甸自南向北递减,南北差异较小的为夏季,其次是春季、秋季,差异最大的是冬季。天气形势：春季最高气温北部比南部偏高5℃以上,高空多处于低涡底部或低压槽底,850 h Pa风场为偏西气流控制,地面为弱气压场控制;春季最高气温北部比南部偏低,高空多处于低涡后部或槽后,850 h Pa风场为偏北气流控制,地面为高压前部,地面有云或无云大风,风向为偏北风;冬季最低气温北部比南部偏低8℃以上,高空为涡后或槽后,850 h Pa风场为西北气流或偏北气流控制,地面辽宁北部为地形槽,长白山地区为高压场;冬季最低气温北部比南部略低,高空为涡前或槽前,850 h Pa为西南气流控制,地面受低压或高压后部偏南气流控制,云量较多。
基金Under the auspices of National Natural Science Foundation of China (No. 40375032,No. 40675043)
文摘Using the daily maximum and minimum temperature dataset from 128 stations from 1960 to 2004 in Northwest China,daily extreme high temperature(EHT)and extreme low temperature(ELT)thresholds were deter-mined by centesimal method for different stations at first,then yearly EHT and ELT events were counted up in differ-ent stations,and the characteristics of their spatio-temporal distribution were diagnosed at last.The study drew follow-ing conclusions:1)The consistent anomaly distribution characteristic was the most important mode of the EHT and ELT events in Northwest China.2)The spatial distribution of the EHT and ELT events can be divided into five sub-regions,namely,the north of Qinghai and west of Gansu,the north of Xinjiang,the south of Xinjiang,the east of Northwest China and the south of Qinghai.3)The EHT events showed remarkable increasing trend in all of five sub-regions,but only in the north of Qinghai and west of Gansu area,sudden change phenomenon occurred;the ELT events showed decreasing trend in all of five sub-regions,and sudden change phenomenon occurred in Northwest China except for south of Qinghai.4)In all of five sub-regions the EHT events showed remarkable 12-14yr period os-cillation,and the ELT event showed significant 13-15yr and 7-8yr period oscillation.5)The EHT and ELT events displayed remarkable positive and negative responses to regional warming of Northwest China respectively.
