Based on monthly data of precipitation,temperature,sunshine duration,wind speed,relative humidity and other climatic factors in Youyang County during 1956-2013,net primary productivity(NPP)in the county was calculated...Based on monthly data of precipitation,temperature,sunshine duration,wind speed,relative humidity and other climatic factors in Youyang County during 1956-2013,net primary productivity(NPP)in the county was calculated by using a climate productivity model,and effects of changes in climatic factors on NPP in the county were studied.The results show that annual average NPP in Youyang County during 1956-2013was 11.137 t/(hm^2·a),but there were no significant changes over the past 58 years.There was a significantly positive correlation between NPP and annual precipitation or annual mean relative humidity.Under the background of global warming,NPP in Youyang County will face greater pressure,thereby putting pressure on local ecological environment.The research can provide scientific reference for the construction of Youyang County and ecological protection zones in the southeast of Chongqing.展开更多
Spheroidal modes of seismic and acoustic oscillations in the atmosphere occur within the 2 to 7 mHz range with peak-to-peak variations in the order of 10–12 to 10–11 m·s–2. Previous research indicated the ampl...Spheroidal modes of seismic and acoustic oscillations in the atmosphere occur within the 2 to 7 mHz range with peak-to-peak variations in the order of 10–12 to 10–11 m·s–2. Previous research indicated the amplitudes for 230 s and 270 s periods peak during the summer months. In the present study the amplitudes of a reliably apparent 3 mHz increment from spectral analyses of minute-to-minute measurements of background photon emissions by a photomultiplier tube housed in a dark room were sampled for a one year period. The peak increase in the power of this increment was maximal during the summer months and overlapped conspicuously with the annual variation in fundamental spheroidal modes of seismic free oscillations. Quantitative estimates indicate that relative shifts in the order of 10–11 W/m2 for photon emissions may reflect the annual variation in coupled oscillations between the earth and atmosphere.展开更多
基金Supported by Chongqing Social Science Planning Project(2015YBGL119)Chongqing Education Commission Humanities and Social Sciences Project(15SKG157)Chongqing Three Georges University Project(14ZD15)
文摘Based on monthly data of precipitation,temperature,sunshine duration,wind speed,relative humidity and other climatic factors in Youyang County during 1956-2013,net primary productivity(NPP)in the county was calculated by using a climate productivity model,and effects of changes in climatic factors on NPP in the county were studied.The results show that annual average NPP in Youyang County during 1956-2013was 11.137 t/(hm^2·a),but there were no significant changes over the past 58 years.There was a significantly positive correlation between NPP and annual precipitation or annual mean relative humidity.Under the background of global warming,NPP in Youyang County will face greater pressure,thereby putting pressure on local ecological environment.The research can provide scientific reference for the construction of Youyang County and ecological protection zones in the southeast of Chongqing.
文摘Spheroidal modes of seismic and acoustic oscillations in the atmosphere occur within the 2 to 7 mHz range with peak-to-peak variations in the order of 10–12 to 10–11 m·s–2. Previous research indicated the amplitudes for 230 s and 270 s periods peak during the summer months. In the present study the amplitudes of a reliably apparent 3 mHz increment from spectral analyses of minute-to-minute measurements of background photon emissions by a photomultiplier tube housed in a dark room were sampled for a one year period. The peak increase in the power of this increment was maximal during the summer months and overlapped conspicuously with the annual variation in fundamental spheroidal modes of seismic free oscillations. Quantitative estimates indicate that relative shifts in the order of 10–11 W/m2 for photon emissions may reflect the annual variation in coupled oscillations between the earth and atmosphere.
