[Objective] The research aimed to study the seasonal variation characteristics of precipitation and temperature in China during 1951-1999. [Method] Based on the monthly average precipitation and temperature data in 16...[Objective] The research aimed to study the seasonal variation characteristics of precipitation and temperature in China during 1951-1999. [Method] Based on the monthly average precipitation and temperature data in 160 stations from January, 1951 to February, 1999, which were provided by China Meteorological Administration, the spatial-temporal variation characteristics of precipitation and temperature in 48 years were studied by using SEOF method. [Result] SEOF analysis of precipitation:SEOF analysis of the first modal showed the four-season propulsion of rain belt in China from south to north. Seen from the time coefficient, as a whole, the precipitation in China decreased slightly during the 1960s-1970s. After the 1970s, the precipitation had the increase trend and was the decrease trend after the 1980s. SEOF analysis of temperature:the first modals of precipitation and temperature configured well in the space. In the dry zone where the precipitation was less, the temperature variation was obvious. Seen from the time sequence, the temperature in China during 1951-1999 was low, and it was the low temperature period in the 1950s. The temperature rose slightly during the 1950s-1960s, and it entered into the low temperature period again from the middle and latter periods of 1960s to early the 1970s. From the metaphase of 1970s to the end of 1990s, the temperature increased relatively and stably. [Conclusion] The research provided the theory basis for studying the climate variation in China.展开更多
文摘[Objective] The research aimed to study the seasonal variation characteristics of precipitation and temperature in China during 1951-1999. [Method] Based on the monthly average precipitation and temperature data in 160 stations from January, 1951 to February, 1999, which were provided by China Meteorological Administration, the spatial-temporal variation characteristics of precipitation and temperature in 48 years were studied by using SEOF method. [Result] SEOF analysis of precipitation:SEOF analysis of the first modal showed the four-season propulsion of rain belt in China from south to north. Seen from the time coefficient, as a whole, the precipitation in China decreased slightly during the 1960s-1970s. After the 1970s, the precipitation had the increase trend and was the decrease trend after the 1980s. SEOF analysis of temperature:the first modals of precipitation and temperature configured well in the space. In the dry zone where the precipitation was less, the temperature variation was obvious. Seen from the time sequence, the temperature in China during 1951-1999 was low, and it was the low temperature period in the 1950s. The temperature rose slightly during the 1950s-1960s, and it entered into the low temperature period again from the middle and latter periods of 1960s to early the 1970s. From the metaphase of 1970s to the end of 1990s, the temperature increased relatively and stably. [Conclusion] The research provided the theory basis for studying the climate variation in China.
