喀什站高空温度资料均一性检验与订正

利用加拿大环境部气候研究中心研发的RHtest均一化检验方法,结合历史台站沿革信息对喀什站各标准等压面高空温度资料进行了均一性检验和分析。结果表明:850～300 hPa共6个层次的高空日温度观测资料序列完整性较好。08时100 hPa月平均温度的缺测率3%,完整性较差,20时100 hPa的完整性最差,缺测率高达11.44%,其他层次的完整性则较好。喀什站温度资料的非均一性主要是由于台站位置变动、观测仪器换型、观测规范变更和辐射误差订正方法的变化引起的。在订正过程中发现,为了保证订正序列的可信度,需要充分考虑到原始观测序列的缺测率。08时年温度序列的断点数量要明显多于20时,08时序列的订正率达到了85.71%,而20时仅有100 h Pa一条序列做了订正。

Homogeneity test and adjustment of the temperature in Kashgar

With the help of the RHtest method developed by the Environment Canada and the metadata, we did the homogeneity test in the mandatory level temperature data of the Kashgar sounding stations in China area. The result shows that the station location change,observation instrument change,Observation specification change and the radiation correction method changes are the main reasons of the inhomogeneity in Kashgar sounding temperature. The breakpoints at 07:00 are obviously more than at 19:00. With the increase of altitude, the stratospheric bottom changes from the original cooling trend to the warming trend at 07:00 after correction.The magnitude of tropospheric top warming decreases as a result of revision.The revised principle below tropopause shows the opposite trend with the original sequence.At 19:00 a.m., the range of stratospheric bottom cooling was weakened by the correction.