Parameters of weather generator BCC/RCG-WG for daily non-precipitation variables including maximum temperature, minimum temperature and sunshine hours at 669 stations in China are estimated using history daily records...Parameters of weather generator BCC/RCG-WG for daily non-precipitation variables including maximum temperature, minimum temperature and sunshine hours at 669 stations in China are estimated using history daily records from 1951 to 1978 and from 1979 to 2007 respectively. The changes in the parameters for the two periods are revealed to explore the impact of climate change on these parameters. The results show that the parameters of the non-precipitation variables have experienced different changes. While the annual means and the amplitudes of the seasonal cycle show a clear change, the interannual variability, the timings of the seasonal cycles, and the temporal correlations for each variable remain practically unchanged. This indicates that climate changes in China over the last 57 years are mainly reflected in variations in the means and in the strength of the seasonal cycles. The changed parameters have implications for the stationary assumption implied in the parameter estimation and use of the weather generator for climate change studies.展开更多
Ten healthy tree species with regular management were selected on the campus of Beijing Forestry University, and they belong to tall tree, shrub and liana, respectively. Water potential and hydraulic architecture para...Ten healthy tree species with regular management were selected on the campus of Beijing Forestry University, and they belong to tall tree, shrub and liana, respectively. Water potential and hydraulic architecture parameters of one-year-old twigs were measured in sunny day in the last ten days of March to the middle ten days of May in 2002. The results show that the daily change in water potential of tree species examined appears convex, i.e. the water potential is higher in the morning and evening, and ...展开更多
Prediction of earthquakes using GPS remains an unsolved but important problem.Pre-signals in terms of changes in triangular networks of GPS Stations were examined for many large earthquakes in Japan and in other Asian...Prediction of earthquakes using GPS remains an unsolved but important problem.Pre-signals in terms of changes in triangular networks of GPS Stations were examined for many large earthquakes in Japan and in other Asian regions.I discovered that the occurrence and location of an earthquake can be predicted with pre-signals found in GPS data analysis.However,more research is required to predict how many days after the pre-signals an earthquake will occur.展开更多
基金The Special Scientific Research Fund of Meteorological Public Welfare Profession of China,No.GYHY201106018The Swedish Foundation for International Cooperation in Research and High Education
文摘Parameters of weather generator BCC/RCG-WG for daily non-precipitation variables including maximum temperature, minimum temperature and sunshine hours at 669 stations in China are estimated using history daily records from 1951 to 1978 and from 1979 to 2007 respectively. The changes in the parameters for the two periods are revealed to explore the impact of climate change on these parameters. The results show that the parameters of the non-precipitation variables have experienced different changes. While the annual means and the amplitudes of the seasonal cycle show a clear change, the interannual variability, the timings of the seasonal cycles, and the temporal correlations for each variable remain practically unchanged. This indicates that climate changes in China over the last 57 years are mainly reflected in variations in the means and in the strength of the seasonal cycles. The changed parameters have implications for the stationary assumption implied in the parameter estimation and use of the weather generator for climate change studies.
文摘Ten healthy tree species with regular management were selected on the campus of Beijing Forestry University, and they belong to tall tree, shrub and liana, respectively. Water potential and hydraulic architecture parameters of one-year-old twigs were measured in sunny day in the last ten days of March to the middle ten days of May in 2002. The results show that the daily change in water potential of tree species examined appears convex, i.e. the water potential is higher in the morning and evening, and ...
文摘Prediction of earthquakes using GPS remains an unsolved but important problem.Pre-signals in terms of changes in triangular networks of GPS Stations were examined for many large earthquakes in Japan and in other Asian regions.I discovered that the occurrence and location of an earthquake can be predicted with pre-signals found in GPS data analysis.However,more research is required to predict how many days after the pre-signals an earthquake will occur.
