摘要
对古里雅冰心积累量与太阳活动的关系进行了研究 ,探讨了中国过去 2 0 0 0 a降水变化的区域分异。结果表明 :过去 2 0 0 0 a古里雅冰心积累量在百年尺度以上受到了太阳活动的作用 ;以公元 6 0 0年为界 ,之前古里雅冰心积累量和中国东部干湿序列变化基本一致 ,之后二者变化相反 ;近 2 0 0 0 a青藏高原西北部与高原南部的降水变化基本一致 ,而与高原东北部的干湿变化位相相反 ;在中世纪暖期 (10 0 0～ 130 0 AD)北半球以干旱气候为主。
In this paper, using wavelet analysis technique, the relationship of Guliya ice core accumulation to solar activity is studied firstly. It is found that, whether on centennial scale or millennium time scale, variation trends of Guliya ice core accumulation with 14 C content and residual 14 C show good mutual agreement. Correlation coefficient between Guliya and 14 C is 0.25 on centennial scale and 0.64 on millennium time scale, which are significant at the 99% confidence level, indicating an impact of solar activity and geomagnetic activity on middle latitude climate change. In contrast with geomagnetic activity, solar activity might be a major driving factor of precipitation change of Guliya area. In addition, other data from the Northern Hemisphere indicate that good correlation exists between climatic change and solar activity. Compared with rainfall data from other regions of China, the change of Guliya ice core accumulation before 600 AD was basically consistent with that of moist dry climatic systems of East China but out of phase after 600 AD over the past two millennia, suggesting that rainfall variations in Guliya area and East China might have been commonly dominated by solar activity since 600 AD and rainfall changes in the two regions before 600 AD might have been controlled by other forcing factors. Evidence from ice core and lake sediments data shows that the rainfall variations in northwestern Tibetan Plateau basically agree with those of southern Tibetan Plateau but are opposite to drought moist variation in northern eastern Tibetan Plateau. The change of the Indian monsoon precipitation was out of phase with that of northwestern Tibetan Plateau but in phase with that of northeastern Tibetan Plateau during the bulk of the last 2000 years. The good correlation of Guliya ice core accumulation, rainfall variation in the western United States, lake level and glacier fluctuations in European continent, drought frequency in the northern Great Plains, rainfall and dro
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2001年第3期61-66,共6页
Marine Geology & Quaternary Geology
基金
中国科学院"九五"重大资助项目 (KZ95 1-A1-2 0 4-0 2
KZ95 1-A1-4 0 2 -0 3 )
