摘要
综合国内外学者对短时间尺度气候事件的研究成果 ,对新仙女木事件 ( YD)的全球性分布及其界定方法和成因机制进行探讨。揭示了新仙女木期的气候特征和多种不同的气候替代指标 ,表明在太阳辐射 -大气 -冰盖 -陆地 -生物相互作用、多层次反馈的全球气候系统中存在着非线性气候变化 ,且在时间上、地域上存在着明显的差别 (不同步性 )。进一步阐明了 YD事件是全球性气候突变事件 ,是全球气候变暖、海平面上升过程中一次短暂的滞缓或回返 ,支持了 Fairbanks的气候 -海平面变化理论。冰期 -全新世过渡期气候变暖的驱动力是地球轨道参数的变化 ,YD事件作为非轨道事件 ,其驱动力可能归因于全球 CO2 浓度的变化 ,但 CO2 变化的因果关系至今尚无定论。
Based on the integrative scientific research achievements of the scientists at home and abroad about the short time scale climatic changes, the global distribution and discriminating methods, as well as the generating mechanism of the 'Younger Dryas' (YD) Event are discussed in this paper. Various climatic features and proxies during the YD event are opened out, which indicate that there had been non linear climate changes in the Global Climate System a hierarchical feedback system, while obvious differences occurred in different areas and episodes during the interaction among the solar radiation, atmosphere, ice cap, land and organism(unsynchronism). The YD event, is further clarified as an abrupt event of global climatic changes and a brief stagnation or return during the global warming up process and the sea level rising period, which supports Fairbank′s climate—sea level change theory. The driver of the climate warming up process from the glacial period to the transitional period of the Holocence may be the change of global orbital parameters. Not being an orbital event, the driver of the YD event should be the oscillation of the global CO 2 density. However, the causality of the global oscillation in CO 2 density is still debatable.
出处
《黄渤海海洋》
CSCD
2000年第1期74-83,共10页
Journal of Oceanography of Huanghai & Bohai Seas
基金
国家自然科学基金!4973 62 1 0
