地理研究 ›› 2019, Vol. 38 ›› Issue (4): 794-806.doi: 10.11821/dlyj020180628

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1961—1987年与1988—2014年辽宁省气候区划界线变化及可能气候成因

王涛(), 王乙舒, 崔妍, 敖雪, 侯依玲, 沈玉敏, 王小桃   

  1. 沈阳区域气候中心,沈阳 110166
  • 收稿日期:2018-06-19 修回日期:2018-09-19 出版日期:2019-04-20 发布日期:2019-04-30
  • 作者简介:

    作者简介:王涛(1985-),男,辽宁沈阳人,硕士,工程师,研究方向为气候变化与气候预测。E-mail: nick_bsb@126.com

  • 基金资助:
    中国气象局2016年气候变化专项(CCSF201608);辽宁省科技农业攻关及产业化项目(2015103038);宁省气象局科研项目(BA201606);2018年山洪延伸期尺度客观化网格预测业务建设项目

The climate regionalization variation and its possible climate causes in Liaoning province over 1961-1987 and 1988-2014

Tao WANG(), Yishu WANG, Yan CUI, Xue AO, Yiling HOU, Yumin SHEN, Xiaotao WANG   

  1. Shenyang Regional Climate Center, Shenyang 110166, China
  • Received:2018-06-19 Revised:2018-09-19 Online:2019-04-20 Published:2019-04-30

摘要:

基于同一区划方法、指标体系,使用1961—2014年辽宁省52站气象观测资料,分析辽宁省气温、气候区划指标、范围及界线的变动特征。结果表明:辽宁省年均气温在1988年发生一次突变,突变后气温开始显著上升;≥10 ℃积温日数比较显著地响应气温突变,而干燥指数、7月平均气温变化不显著。在空间分布上区划指标值均存在不同程度的变化。① 全省≥10 ℃积温日数均出现增加,但在中西部地区显著增加;② 在盘锦-抚顺一线以北(南),气候总体呈不显著变湿(干)趋势;③ 7月平均气温呈缓慢上升趋势。区划范围及界线位置出现更加显著地变化:① 暖温带范围主要向北向东扩展,中温带向东收缩;② 半湿润区范围主要向北向西扩展,半干旱区向西北方向收缩,湿润区范围基本不变;③ Tb范围显著向北向东扩展,Ta范围向北向东收缩。在此基础上分析了气候格局变化的可能气候成因,发现突变后≥10 ℃积温日数期间500 hPa高度场增加与4月和10月东亚冬季风减弱,4—10月东北冷涡持续天数增加和7月500 hPa高度场增加,可能分别是温度带,Tb区、Ta区和半湿润区、半干旱区变化的原因。

关键词: 辽宁省, 成因分析, 气候区划, 东亚夏季风, 东北冷涡

Abstract:

Based on the identical classification methodologies and criteria system, using the daily observations for 52 meteorological stations during the period 1961-2014, and the characteristics of the temperature, climatic regionalization indicators, area and boundaries changes, the results suggest that the temperature experienced obviously an abrupt change around 1988 in Liaoning province, and after the change, the climate became warmer significantly. The days with daily accumulated temperature above 10 ℃ responds to the change observably, but the annual aridity index and the July mean temperature do not. The regionalization indicators have some changes to various degree in terms of spatial distribution: (1) the number of days with daily accumulated temperature above 10 ℃ increased in the whole province, but more significantly in the central and western parts; (2) climate becomes wet (dry) insignificantly to north (south) of Panjin-Fushun; (3) the July mean temperature alse rises insignificantly. Location of regionalization areas and boundaries have a more significant change: (1) the boundaries of the warm temperate - middle temperate zone mainly shift northward and eastward, and the area of the warm temperate zone (meso-temperate zone) has increased (decreased); (2) the boundary of semi-arid and sub-humid regions mainly shift northward and westward, and the area of semi-arid regions (sub-humid regions) has decreased (increased), but humid regions remains unchanged. (3) The boundary of Tb and Ta mainly shifts northward and eastward, and the area of Ta (Tb) has decreased (increased). On this basis, possible causes for spatial changes of the climatic pattern are analyzed. After the change, 500 hPa height field increased corresponding to the days with daily accumulated temperature above 10℃ and East Asian winter monsoon index increase in April and October may lead to changes of temperature zones. Weakness of increased duration lasting days of Northeast cold vortex from April to September is favorable to changes of semi-arid and sub-humid regions. Increasing 500 hPa height field in July is favorable to changes of Ta and Tb.

Key words: Liaoning province, cause analysis, climatic regionalization, East Asian summer monsoon, Northeast cold vortex