Based on the high-resolution datasets collected in a sea fog field experiment at the northern coast of South China Sea,the variations of liquid water content (LWC) and net longwave radiation flux (NLRF) during two sea...Based on the high-resolution datasets collected in a sea fog field experiment at the northern coast of South China Sea,the variations of liquid water content (LWC) and net longwave radiation flux (NLRF) during two sea fog events on 16th-17th and 18th-19th March,2008 are exaimeed by wavelet analysis,and the cooling mechanisms for fog formation and persistence are also investigated.The main results are shown as follows.(1) Sea fog may develop and persist whether it is cloudy or not aloft.However,when there is cloud aloft the LWC is less and wind speed in sea fog is higher than that in the clear sky.(2) The quasi-periodic oscillations (QPOs) of NLRF are observed in the formation stage of the two fogs.QPOs of LWC are only found in the developing stage no matter with cloudless or cloudy condition.(3) It is likely that sea fog forms by the cooling effects of longwave radiation and develops through the vertical mixing induced by the radiative cooling at the upper level.(4) During sea fog development and persistence,other mechanisms could also play important roles in fog-layer cooling,such as turbulent heat transport and radiation transport between air-sea interfaces.展开更多
本文依托大规模新发掘语料,对北京话被动标记"给"的来源和历时演变进行了系统考察,将长被动用法的语义演变路径总结为:给予>可控容让>不可控容让>长被动,并引入[自主]、[变化]、[可控]等参数刻画施动向受动转化的渐...本文依托大规模新发掘语料,对北京话被动标记"给"的来源和历时演变进行了系统考察,将长被动用法的语义演变路径总结为:给予>可控容让>不可控容让>长被动,并引入[自主]、[变化]、[可控]等参数刻画施动向受动转化的渐变过程。受同类标记"让"的压制,长被动用法相对弱势。短被动用法的形成则得益于"给"的介词悬空用法,可细分为三种来源。"给"兼表"受益"和"被动"的事实也对Croft(1991)的"致使顺序假说"(Causal Order Hypothesis)提出了挑战。展开更多
基金Natural Science Foundation of China (40675013,40906010)The projects for Science and Technology in Guangdong Province "Pearl River Estuary Monitoring and Early Warning System for Sea Fog"Scientific and Technological Planning Project from Guangdong Province (2006B37202005)
文摘Based on the high-resolution datasets collected in a sea fog field experiment at the northern coast of South China Sea,the variations of liquid water content (LWC) and net longwave radiation flux (NLRF) during two sea fog events on 16th-17th and 18th-19th March,2008 are exaimeed by wavelet analysis,and the cooling mechanisms for fog formation and persistence are also investigated.The main results are shown as follows.(1) Sea fog may develop and persist whether it is cloudy or not aloft.However,when there is cloud aloft the LWC is less and wind speed in sea fog is higher than that in the clear sky.(2) The quasi-periodic oscillations (QPOs) of NLRF are observed in the formation stage of the two fogs.QPOs of LWC are only found in the developing stage no matter with cloudless or cloudy condition.(3) It is likely that sea fog forms by the cooling effects of longwave radiation and develops through the vertical mixing induced by the radiative cooling at the upper level.(4) During sea fog development and persistence,other mechanisms could also play important roles in fog-layer cooling,such as turbulent heat transport and radiation transport between air-sea interfaces.
文摘本文依托大规模新发掘语料,对北京话被动标记"给"的来源和历时演变进行了系统考察,将长被动用法的语义演变路径总结为:给予>可控容让>不可控容让>长被动,并引入[自主]、[变化]、[可控]等参数刻画施动向受动转化的渐变过程。受同类标记"让"的压制,长被动用法相对弱势。短被动用法的形成则得益于"给"的介词悬空用法,可细分为三种来源。"给"兼表"受益"和"被动"的事实也对Croft(1991)的"致使顺序假说"(Causal Order Hypothesis)提出了挑战。
