论文部分内容阅读
基于探空资料与空间分辨率为3°×3°、2.5°×2.5°、2°×2°、1.5°×1.5°、1.125°×1.125°、1°×1°、0.75°×0.75°、0.5°×0.5°的ERA-Interim再分析资料,运用气候倾向率和线性插补法,分析了1979-2012年高亚洲地区夏季自由大气0℃层高度的时空变化特征,并探讨了其与纬度、海拔的关系,以及不同空间分辨率的ERA-Interim再分析资料与探空实测资料之间的相关性.结果表明:不同空间分辨率的ERA-Interim再分析资料与探空实测资料得到的0℃层高度自20世纪70年代末以来普遍表现为上升趋势,并且分辨率为0.75°×0.75°的再分析资料所得的0℃层高度在4800 ～ 5000 m之间波动与探空实测资料所得的0℃层高度接近.不同空间分辨率的ERA-Interim再分析数据与探空实测数据得到的0℃层高度有相似的空间分布,并且其空间变化通常与纬度和海拔相关.高亚洲地区0℃层高度表现出了从北到南,从低海拔到高海拔增加的趋势.从1979-2012年将不同空间分辨率的ERA-Interim再分析数据插值到各个站点得到绝大部分站点的内插格点数据与实测资料偏差为负值,也就是说再分析资料得到的0℃层高度与探空实测结果存在冷偏差,并且分辨率相对较高的ERA-Interim再分析资料与探空实测结果的冷偏差较小的比例更大.“,”Based on radiosonde data and ERA-Interim reanalysis with resolution of 3°×3°,2.5°×2.5°,2°×2°,1.5°×1.5°,1.125°×1.125°,1°×1°,0.75°×0.75°,0.5°×0.5°.The variation of 0 ℃ isotherm height in summer over High Asia during 1979-2012 is analyzed by using the climate tendency rate and linear interpolated.The relationship with latitude and altitude as well as the correlation of ERA-Interim reanalysis with different spatial resolutions and radiosonde data are discussed.The result indicates that variation of 0 ℃ isotherm height in summer since 1970s shows an increasing trend based on radiosonde data and ERA-Interim reanalysis with different spatial resolutions.0 ℃ isotherm height based on the reanalysis data with resolution of 0.75 °× 0.75° is fluctuate between 4800 ～ 5000 m which is close to the radiosonde data.0 ℃ isotherm height based on the ERA-Interim reanalysis with different resolutions and radiosonde data have similar spatial distribution which are usually associated with latitude and altitude.In High Asia,0 ℃ isotherm height showed an increasing trend from north to south and from low to high elevations.ERA-Interim reanalysis with different spatial resolutions interpolated to each stations have the negative bias of most interpolated gridded data and measured data during 1979-2012,which 0 ℃ isotherm height based on the reanalysis data exists cold bias with radiosonde data,in which the small cold bias of the ERA-Interim reanalysis with high spatial resolutions and radiosonde data has a greater proportion.