Based on sounding data from 1975 to 2005 and TM/ETM+ remote sensing images in 1989, 2001 and 2007, the climate changes in Harbin City, Northeast China in recent 30 years were analyzed and forecasted. Results show that...Based on sounding data from 1975 to 2005 and TM/ETM+ remote sensing images in 1989, 2001 and 2007, the climate changes in Harbin City, Northeast China in recent 30 years were analyzed and forecasted. Results show that in the lower troposphere the meridional wind speed and mean annual wind speed decrease, and in the lower stratosphere the temperature decreases while the meridional wind speed increases significantly. In the study area, the climate is becoming warmer and wetter in the middle lower troposphere. The expansion of urban area has great effects on the surface air temperature and the wind speed, leading to the increase of the surface air temperature, the decrease of the surface wind speed, and the increase of the area of urban high temperature zone. The quantitative equations have been established among the surface air temperature, the carbon dioxide (CO2) concentration and the specific humidity (the water vapor content). It is predicted that the future increasing rate of the surface air temperature is 0.85℃/10yr if emission concentration of CO2 remains unchanged; if emission concentration of CO2 decreases to 75%, 50% and 25%, respectively, the surface air temperature will increase 0.65℃/10yr, 0.46℃/10yr and 0.27℃/10yr, respectively. The rise of the surface air temperature in the study area is higher than that of the global mean temperature forecasted by IPCC.展开更多
As the biggest global emitter of greenhouse gases, China is an extremely important actor in international climate negotiations. During the climate summit in Copenhagen, China was blamed for its uncooperative positions...As the biggest global emitter of greenhouse gases, China is an extremely important actor in international climate negotiations. During the climate summit in Copenhagen, China was blamed for its uncooperative positions particularly from the US side. However, in the Paris climate process, China's participation in international negotiations is more active, and has become a wellrecognized promoter of the Paris Agreement. To understand China's climate policy, the economic and diplomatic strategy should be taken into consideration, especially the changes in the ideas of China's global governance rooted from domestic politics discourse. Moreover, China's symmetrical changes within domestic and international dimension possibly bring out more balanced climate policies and thus the constructive role of China will be the normalcy in the future United Nations Framework Convention on Climate Changenegotiations. However, the negotiations after the US presidential elections may change dramatically and yields great uncertainty for global action. Thus, the vacuum of power may be a possible scenario. Will China reinforce its role toward leadership or go back to group politics? This article examines China's concerns, motives, and possible path to climate leadership in the current debate.展开更多
The Turpan-Hami basin, rich in coal and petroleum, is a superimposed basin of three types basins in different tectonic environments. This coal, oil and gas basin has undergone a complex tectonic-sedimentary evolution,...The Turpan-Hami basin, rich in coal and petroleum, is a superimposed basin of three types basins in different tectonic environments. This coal, oil and gas basin has undergone a complex tectonic-sedimentary evolution, in which two important stages were the negative inversion from a foredeep to a extensional basin during Early Mesozoic and the positive inversion to a thrust foreland basin in Late MesozoicEarly Cenozoic. The early normal faults residues are recognized with the addition of tectonic-sedimentary analysis to confirm the basin extension during Jurassic time and its tectonic inversion subsequently.展开更多
The characteristics of atmospheric heat source associated with the summer monsoon onset in the South China Sea (SCS) are studied using ECMWF reanalysis data from 1979 to 1993. A criterion of the SCS summer monsoon ons...The characteristics of atmospheric heat source associated with the summer monsoon onset in the South China Sea (SCS) are studied using ECMWF reanalysis data from 1979 to 1993. A criterion of the SCS summer monsoon onset is defined by the atmospheric heat source. Applying this criterion to the 15-year (1979 – 1993) mean field, the onset of the SCS summer monsoon is found to occur in the fourth pentad of May. And this criterion can also give reasonable results for the onset time of the SCS summer monsoon on a year-to-year basis. In addition, pretty high correlation has been found between the onset time of the SCS summer monsoon and the zonal mean vertically integrated heat source <Q1> at 40°S in April. The causes for the late or early onset of the SCS summer monsoon and the close relationship between the onset time and the zonal mean vertically integrated heat source <Q1> at 40 °S in April might be explained by the variations in intensity of the Hadley circulation.展开更多
The CS radical was generated by discharging the mixture gas of CS2 and Helium. The Doppler limited spectra of CS were recorded in the region of 12350-12950 cm^-1 using optical heterodyne concentration modulation absor...The CS radical was generated by discharging the mixture gas of CS2 and Helium. The Doppler limited spectra of CS were recorded in the region of 12350-12950 cm^-1 using optical heterodyne concentration modulation absorption spectroscopy. Three hundred and twenty-six lines were recorded and assigned to the d^3△-a^3П （8,1） band, in which eighty-three transitions were first observed. A set of improved molecular constants for the d^3△（v=8） and a^3П（v=1） levels were determined by a non-linear least-squares fitting of all the lines to the effective Hamiltonian.展开更多
基金Under the auspices of Major State Basic Research Development Program of China (No. 2010CB950900)Technology Innovation Program of Harbin City (No. 2007RFXXS029)
文摘Based on sounding data from 1975 to 2005 and TM/ETM+ remote sensing images in 1989, 2001 and 2007, the climate changes in Harbin City, Northeast China in recent 30 years were analyzed and forecasted. Results show that in the lower troposphere the meridional wind speed and mean annual wind speed decrease, and in the lower stratosphere the temperature decreases while the meridional wind speed increases significantly. In the study area, the climate is becoming warmer and wetter in the middle lower troposphere. The expansion of urban area has great effects on the surface air temperature and the wind speed, leading to the increase of the surface air temperature, the decrease of the surface wind speed, and the increase of the area of urban high temperature zone. The quantitative equations have been established among the surface air temperature, the carbon dioxide (CO2) concentration and the specific humidity (the water vapor content). It is predicted that the future increasing rate of the surface air temperature is 0.85℃/10yr if emission concentration of CO2 remains unchanged; if emission concentration of CO2 decreases to 75%, 50% and 25%, respectively, the surface air temperature will increase 0.65℃/10yr, 0.46℃/10yr and 0.27℃/10yr, respectively. The rise of the surface air temperature in the study area is higher than that of the global mean temperature forecasted by IPCC.
文摘As the biggest global emitter of greenhouse gases, China is an extremely important actor in international climate negotiations. During the climate summit in Copenhagen, China was blamed for its uncooperative positions particularly from the US side. However, in the Paris climate process, China's participation in international negotiations is more active, and has become a wellrecognized promoter of the Paris Agreement. To understand China's climate policy, the economic and diplomatic strategy should be taken into consideration, especially the changes in the ideas of China's global governance rooted from domestic politics discourse. Moreover, China's symmetrical changes within domestic and international dimension possibly bring out more balanced climate policies and thus the constructive role of China will be the normalcy in the future United Nations Framework Convention on Climate Changenegotiations. However, the negotiations after the US presidential elections may change dramatically and yields great uncertainty for global action. Thus, the vacuum of power may be a possible scenario. Will China reinforce its role toward leadership or go back to group politics? This article examines China's concerns, motives, and possible path to climate leadership in the current debate.
文摘The Turpan-Hami basin, rich in coal and petroleum, is a superimposed basin of three types basins in different tectonic environments. This coal, oil and gas basin has undergone a complex tectonic-sedimentary evolution, in which two important stages were the negative inversion from a foredeep to a extensional basin during Early Mesozoic and the positive inversion to a thrust foreland basin in Late MesozoicEarly Cenozoic. The early normal faults residues are recognized with the addition of tectonic-sedimentary analysis to confirm the basin extension during Jurassic time and its tectonic inversion subsequently.
基金National Natural Science Foundation of China (40275026) Part One of National KeyFundamental Research and Development Planning Project (G1998040900)
文摘The characteristics of atmospheric heat source associated with the summer monsoon onset in the South China Sea (SCS) are studied using ECMWF reanalysis data from 1979 to 1993. A criterion of the SCS summer monsoon onset is defined by the atmospheric heat source. Applying this criterion to the 15-year (1979 – 1993) mean field, the onset of the SCS summer monsoon is found to occur in the fourth pentad of May. And this criterion can also give reasonable results for the onset time of the SCS summer monsoon on a year-to-year basis. In addition, pretty high correlation has been found between the onset time of the SCS summer monsoon and the zonal mean vertically integrated heat source <Q1> at 40°S in April. The causes for the late or early onset of the SCS summer monsoon and the close relationship between the onset time and the zonal mean vertically integrated heat source <Q1> at 40 °S in April might be explained by the variations in intensity of the Hadley circulation.
文摘The CS radical was generated by discharging the mixture gas of CS2 and Helium. The Doppler limited spectra of CS were recorded in the region of 12350-12950 cm^-1 using optical heterodyne concentration modulation absorption spectroscopy. Three hundred and twenty-six lines were recorded and assigned to the d^3△-a^3П （8,1） band, in which eighty-three transitions were first observed. A set of improved molecular constants for the d^3△（v=8） and a^3П（v=1） levels were determined by a non-linear least-squares fitting of all the lines to the effective Hamiltonian.
