TIMING OF THE LAST DEGLACIAL WARMING IN LOW AND MIDDLE LATITUDES OF CHINA: COMPARED WITH BIPOLAR ICE CORE
我国中低纬度末次冰消期气候转暖 与高纬度气候变化的关系*

The process and mechanism of the last deglacial warming have long been the hotspot of paleoclimatological study.However,neither the process nor the mechanism of deglacial warming in low-middle latitude regions has been clear.Here,based on phytolith studies from the Huguangyan Maar Lake,the Weinan loess section and the DGKS9603 core in the East China Sea,combined with other high-resolution paleoclimate records from the Guliya ice core and from the Hulu cave in China,and the BYRD ice core and GRIP ice core in bipolar regions,we try to explore the timing of low-middle latitude and high latitude climate changes during the last deglaciation.By these records,we set up the timing and manner of deglacial warming in low-middle and high latitude as the follows: 1) The deglacial warming manner is different in different records.For example,the BYRD ice core,the Guliya ice core,the Huguangyan Maar Lake,and the Hulu cave record show continuous warming during the deglaciation period,with an about 1000 years duration;while the DGKS9603 core,the Weinan loess section,and the GRIP ice core show an abrupt deglacial warming,with the warming time about hundreds of years or less.(2) The) onset of the deglacial warming is not synchronous.The Guliya and Huguangyan records affected by the Indian and southeast monsoon indicate that the timing of the deglacial warming was at about 19kaB.P.In Antarctic region,the temperature increase was at about 18kaB.P.The Hulu cave,the DGKS9603 core,and the Weinan loess records show the warming at around 16kaB.P.It has long been known that the onset of the deglacial warming in the GRIP ice core was at about 14.5kaB.P.3) It seems that the deglacial warming is earlier in the south part of the Northern Hemisphere than in the north part and in Antarctic regions.Moreover,the deglacial warming manner is continuous in the south part,and abrupt in the north part.The climate change of Guliya is similar to that of Antarctic.Additionally,the Guliya and Huguangyan records show two-step warming in the deglaciation.