Heinrich事件和末次冰期气候的不稳定性

对北大西洋深海沉积物的研究表明：末次冰期北大西洋沉积物记录中有多次洋面温度降低、有孔虫含量减少、盐度降低和粗颗粒的碳酸盐碎屑快速堆积的现象，这些时间跨度上千年或几百年的气候快速波动被称为Heinrich事件^{［１－４］}，很难用古气候的米兰科维奇理论来解释。最近对末次冰期中国马兰黄土堆积的调查发现，在末次冰期之中东亚冬季风也有多次加强，它与北大西洋沉积物中的Heinrich事件对应很好，暗示着东亚季风的变迁更直接受控于北半球冰量的变化，而不是过去人们认为的东亚古季风气候变化与地球轨道变化引起太阳辐射变化直接相关。 

HEINRICH EVENTS AND INSTABILITY OF PALAEOCLIMATE IN LAST GLACIAL PERIOD

As first noted by Heinrich,1988,sediments in the north Atlantic ocean contain a series of layers that are rich in ice-rafted debrises and unusually poor in foraminefera,these lithic fragment layers illustrate that the Atlantic iceberg has advanced to south intermittently in the last glacial period and every times spaced roughly several hundreds or thousands years,these have been proved by late work and named Heinrich events.It's very difficult to explain this phenomenon in Milankovitch theory.It is infered to explain it by reorganised in climatic system.The recent investigations on several loess section in the last glacied period in loess plateau,China, have showed that palaeomonsoonal climate variation during the last glacial period are correlated very well with the records in the north Atlantic ocean. We explained that advance of ice sheet in north hemisphere strengthened the Siberia-Mongolia anticyclon,the intisified winter monsoon governed the loess plateau.We think the ice sheet change in north hemesphere are more directive than the orbital solar insolation to influence the monsoonal climate over loess plateau during the last glacial period.