Seasonal/Regional Variation of Variability Characteristic of Daily Maximum/Minimum Temperatures in Japan Observed and Reproduced by RegCM Nested in NCAR-CSM

スポンサーリンク

概要

• 論文の詳細を見る

• Observation data and output of a regional climate model, RegCM2.5, nested in a global climate model, NCAR-CSM, were analyzed to determine the standard deviation and frequency of extreme values, which were used as indices to characterize the variability of the daily minimum (T_<min>) and maximum (T_<max>) temperatures in Japan. The frequency of extreme values, which are defined in this paper as deviations greater than twofold the standard deviation, was estimated from data using a new method. The significant results of this analysis of observation data are as follows. With regards to both T_<min> and T_<max>, the significant seasonal variations of standard deviation are the annual and semiannual ones, with the minimum value in August and a weak minimum in January. The region where the standard deviation is large drifts northward from february to May, with a maximum standard deviation in April. The central latitude almost agrees with that where the zonal wind is maximum at 500 hPa. As compared with the normal distribution, the extremely high temperature in summer, and the extremely low temperature in winter, are observed less frequently. The indices calculated from the model's output after simulating the current climatic condition were compared with the observation data for evaluation. From this comparison, it is shown that the variability characteristic of T_<max> was not reproduced well ; however, that of T_<min> was reproduced well by the model. Therefore, it is concluded that T_<min> reproduced by RegCM/CSM can be used to predict the change in the frequency of extreme values by correcting the systematic temperature bias, which is within ±1 K.

• 社団法人日本気象学会の論文
• 2005-02-25

著者

• KADOKURA Shinji

  Central Research Institute of Electric Power Industry

• Kadokura Shinji

  Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry

• KATO Hisashi

  Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry

• Kato Hisashi

  Environmental Science Research Laboratory Central Research Institute Of Electric Power Industry

関連論文

• The JRA-25 Reanalysis
• Performance of Global Climate Models for Reproducing Present SLP Field over Eastern Asian Region in the CO_2 Transient Run
• Statistical Downscaling Estimates of High Temperature in Summer in Japan
• Performance of RegCM2.5/NCAR-CSM Nested System for the Simulation of Climate Change in East Asia Caused by Global Warming
• Seasonal/Regional Variation of Variability Characteristic of Daily Maximum/Minimum Temperatures in Japan Observed and Reproduced by RegCM Nested in NCAR-CSM

スポンサーリンク