Information about the protolith of the Huangtuling granulite in North Dabieshan has been unavailable. The complex evolution history of the rock and its host basement must be further discussed. LA-ICP-MS U-Pb dating wa...Information about the protolith of the Huangtuling granulite in North Dabieshan has been unavailable. The complex evolution history of the rock and its host basement must be further discussed. LA-ICP-MS U-Pb dating was conducted on three textural domains in zircon from a high-temperature, high-pressure felsic granulite in the Huangtuling area, North Dabieshan, Central China. The metamorphic growth-derived detrital zircon domain yields a 207^ pb/206^Pb age in the range of （2 49±54 ） -- （2 500±180） Ma. The magmatic genesis-derived detrltal zircon domain gives a 207^pb/ 206^Pb age ranging from 2 628 Ma to 2 690 Ma, with an oldest 206^ pb/ 238^U age of （2 790 ± 150） Ma. The metamorphic overgrowth or metamorphic recrystallization zircon domain yields a diesordia with an upper intercept age of （2 044. 7 ± 29.3 ） Ma. Compositions of the mineral assemblage, major element geochemistry, and especially the complex interior texture of the zircon suggest that the prololith of the felsic granulite is of sedimentary origin. Results show that the protolith material of the granulite came from a provenance with a complex thermal history, i.e. -2.8 Ga magmatlsm and -2.5 Ga metamorphism, and was deposited in a basin not earlier than 2.5 Ga. The high-temperature and high-pressure granulite-facies metamorphic age was precisely constrained at （2.04±0.03） Ga, which indicates the granulite in Huangtuling area should be a relict of a Paleoproterozoic UHT （ultrahigh temperature） metamorphosed slab.展开更多
HY-2A is the first one of the Chinese HY-2 ocean satellite series carrying a microwave radiometer(RM)to measure sea surface temperature,sea surface wind speed,atmospheric water vapor,cloud liquid water content,and rai...HY-2A is the first one of the Chinese HY-2 ocean satellite series carrying a microwave radiometer(RM)to measure sea surface temperature,sea surface wind speed,atmospheric water vapor,cloud liquid water content,and rain rate.We verified the RM level 1B brightness temperature(T B)to retrieve environmental parameters.In the verification,TB that simulated using the ocean-atmosphere radiative transfer model(RTM)was used as a reference.The total bias and total standard deviation(SD)of the RM level 1B TB,with reference to the RTM simulation,ranged-20.6-4.38 K and 0.7-2.93 K,respectively.We found that both the total bias and the total SD depend on the frequency and polarization,although the values for ascending and descending passes are different.In addition,substantial seasonal variation of the bias was found at all channels.The verification results indicate the RM has some problems regarding calibration,e.g.,correction of antenna spillover and antenna physical emission,especially for the 18.7-GHz channel.Based on error analyses,a statistical recalibration algorithm was designed and recalibration was performed for the RM level 1B TB.Validation of the recalibrated TB indicated that the quality of the recalibrated RM level 1B TB was improved significantly.The bias of the recalibrated T B at all channels was reduced to<0.4 K,seasonal variation was almost eradicated,and SD was diminished(i.e.,the SD of the 18.7-GHz channel was reduced by more than 0.5K).展开更多
Carbon emissions embodied in international trade of China during 1997-2007 are accounted by input-output method based on Chinese input-output table and global trade analysis project database.It is revealed that carbon...Carbon emissions embodied in international trade of China during 1997-2007 are accounted by input-output method based on Chinese input-output table and global trade analysis project database.It is revealed that carbon emissions embodied in imports and exports both increased during 1997-2007,but carbon emissions embodied in exports are greater than those embodied in imports,China is a net export nation in embodied carbon.The net exports of embodied carbon account for about 10.82%of the total carbon emissions in 1997,dropped to 7.15%in 2002,increased to 13.13%in 2006,and slightly dropped to 12.64%in 2007.Low-end position of international industry division is an objective factor of being a net exporter of embodied carbon for China,and usage of a large amount of obsolete energy-using equipments wasted much energy and increased carbon emissions embodied in exports. Importers should take more responsibilities for carbon emissions embodied in trade,and China should take a certain responsibility for unreasonable energy dissipations too.展开更多
当今,为了缓解水、能源、粮食3种资源供需矛盾对国际社会造成的沉重压力,从而促使对“水-能源-粮食”纽带关系的探究成为了国际学术界一项热门的研究课题。为了把握国内外“水-能源-粮食”纽带关系研究的发展脉络,以便能够为未来的“水...当今,为了缓解水、能源、粮食3种资源供需矛盾对国际社会造成的沉重压力,从而促使对“水-能源-粮食”纽带关系的探究成为了国际学术界一项热门的研究课题。为了把握国内外“水-能源-粮食”纽带关系研究的发展脉络,以便能够为未来的“水-能源-粮食”纽带关系研究提供科学的理论依据和研究建议,本文决定将Web of Science核心合集数据库与中国知网(CNKI)数据库作为数据来源,利用VOSviewer和CiteSpace计量软件对以往的“水-能源-粮食”纽带关系研究进行梳理,通过对该研究领域所涉及的文献数量、作者合作情况、国家合作情况等信息的可视化呈现,以突发关键词为重点,从时间维度角度来探究“水-能源-粮食”纽带关系研究的发展概况与变化趋势。研究结果表明:1)2010—2022年对“水-能源-粮食”纽带关系的研究已受到国内外学术界的一致重视,论文发文数量呈现出持续增长的趋势,并且各研究国之间均存在着较为密切的合作关系。2)可持续发展、气候变化、治理、研究模型是以往研究文献中出现次数较多的关键词,不但反映出对“水-能源-粮食”纽带关系研究要基于可持续发展的前提之下,而且还拓宽了该纽带关系的研究范围、研究视角、研究方法。3)2010—2022年对“水-能源-粮食”纽带关系的研究已经从纽带关系的内部机制拓展至纽带关系的外部环境,研究方法也由较多的定性分析转向了定量化的模拟预测分析。4)经关键词时间线演进趋势和突现强度分析表明,当前学术界对于“水-能源-粮食”纽带关系的研究已呈现出由初步探索向着纵深解析的转变,并且新的研究方法已被学术界广泛应用于对“水-能源-粮食”纽带关系的探索之中。展开更多
文摘Information about the protolith of the Huangtuling granulite in North Dabieshan has been unavailable. The complex evolution history of the rock and its host basement must be further discussed. LA-ICP-MS U-Pb dating was conducted on three textural domains in zircon from a high-temperature, high-pressure felsic granulite in the Huangtuling area, North Dabieshan, Central China. The metamorphic growth-derived detrital zircon domain yields a 207^ pb/206^Pb age in the range of （2 49±54 ） -- （2 500±180） Ma. The magmatic genesis-derived detrltal zircon domain gives a 207^pb/ 206^Pb age ranging from 2 628 Ma to 2 690 Ma, with an oldest 206^ pb/ 238^U age of （2 790 ± 150） Ma. The metamorphic overgrowth or metamorphic recrystallization zircon domain yields a diesordia with an upper intercept age of （2 044. 7 ± 29.3 ） Ma. Compositions of the mineral assemblage, major element geochemistry, and especially the complex interior texture of the zircon suggest that the prololith of the felsic granulite is of sedimentary origin. Results show that the protolith material of the granulite came from a provenance with a complex thermal history, i.e. -2.8 Ga magmatlsm and -2.5 Ga metamorphism, and was deposited in a basin not earlier than 2.5 Ga. The high-temperature and high-pressure granulite-facies metamorphic age was precisely constrained at （2.04±0.03） Ga, which indicates the granulite in Huangtuling area should be a relict of a Paleoproterozoic UHT （ultrahigh temperature） metamorphosed slab.
基金Supported by the National Key Research and Development Program of China(No.2016YFC1401001)the National Natural Science Foundation of China(Nos.41501417,41406204)
文摘HY-2A is the first one of the Chinese HY-2 ocean satellite series carrying a microwave radiometer(RM)to measure sea surface temperature,sea surface wind speed,atmospheric water vapor,cloud liquid water content,and rain rate.We verified the RM level 1B brightness temperature(T B)to retrieve environmental parameters.In the verification,TB that simulated using the ocean-atmosphere radiative transfer model(RTM)was used as a reference.The total bias and total standard deviation(SD)of the RM level 1B TB,with reference to the RTM simulation,ranged-20.6-4.38 K and 0.7-2.93 K,respectively.We found that both the total bias and the total SD depend on the frequency and polarization,although the values for ascending and descending passes are different.In addition,substantial seasonal variation of the bias was found at all channels.The verification results indicate the RM has some problems regarding calibration,e.g.,correction of antenna spillover and antenna physical emission,especially for the 18.7-GHz channel.Based on error analyses,a statistical recalibration algorithm was designed and recalibration was performed for the RM level 1B TB.Validation of the recalibrated TB indicated that the quality of the recalibrated RM level 1B TB was improved significantly.The bias of the recalibrated T B at all channels was reduced to<0.4 K,seasonal variation was almost eradicated,and SD was diminished(i.e.,the SD of the 18.7-GHz channel was reduced by more than 0.5K).
文摘Carbon emissions embodied in international trade of China during 1997-2007 are accounted by input-output method based on Chinese input-output table and global trade analysis project database.It is revealed that carbon emissions embodied in imports and exports both increased during 1997-2007,but carbon emissions embodied in exports are greater than those embodied in imports,China is a net export nation in embodied carbon.The net exports of embodied carbon account for about 10.82%of the total carbon emissions in 1997,dropped to 7.15%in 2002,increased to 13.13%in 2006,and slightly dropped to 12.64%in 2007.Low-end position of international industry division is an objective factor of being a net exporter of embodied carbon for China,and usage of a large amount of obsolete energy-using equipments wasted much energy and increased carbon emissions embodied in exports. Importers should take more responsibilities for carbon emissions embodied in trade,and China should take a certain responsibility for unreasonable energy dissipations too.
文摘当今,为了缓解水、能源、粮食3种资源供需矛盾对国际社会造成的沉重压力,从而促使对“水-能源-粮食”纽带关系的探究成为了国际学术界一项热门的研究课题。为了把握国内外“水-能源-粮食”纽带关系研究的发展脉络,以便能够为未来的“水-能源-粮食”纽带关系研究提供科学的理论依据和研究建议,本文决定将Web of Science核心合集数据库与中国知网(CNKI)数据库作为数据来源,利用VOSviewer和CiteSpace计量软件对以往的“水-能源-粮食”纽带关系研究进行梳理,通过对该研究领域所涉及的文献数量、作者合作情况、国家合作情况等信息的可视化呈现,以突发关键词为重点,从时间维度角度来探究“水-能源-粮食”纽带关系研究的发展概况与变化趋势。研究结果表明:1)2010—2022年对“水-能源-粮食”纽带关系的研究已受到国内外学术界的一致重视,论文发文数量呈现出持续增长的趋势,并且各研究国之间均存在着较为密切的合作关系。2)可持续发展、气候变化、治理、研究模型是以往研究文献中出现次数较多的关键词,不但反映出对“水-能源-粮食”纽带关系研究要基于可持续发展的前提之下,而且还拓宽了该纽带关系的研究范围、研究视角、研究方法。3)2010—2022年对“水-能源-粮食”纽带关系的研究已经从纽带关系的内部机制拓展至纽带关系的外部环境,研究方法也由较多的定性分析转向了定量化的模拟预测分析。4)经关键词时间线演进趋势和突现强度分析表明,当前学术界对于“水-能源-粮食”纽带关系的研究已呈现出由初步探索向着纵深解析的转变,并且新的研究方法已被学术界广泛应用于对“水-能源-粮食”纽带关系的探索之中。
