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This October 2011 issue has the Special topic of
Climate Change over the Past Millenium in China
Despite the IPCC and the Climategate CRU deliberately trying to suppress the Medieval Warm Period, these Chinese papers confirm their existence.
Modern meteorological observation networks can provide quantitative data on climate change only for the last 100 years. This is not long enough to research long-term regularities and mechanisms of climate change. To study climate change, an approach that has become important is to analyze proxy data. Tree rings are useful for research on millennium climate change because of their accurate dating, high resolution, continuous sequence and diverse indicators such as tree-ring width, density and stable isotopes. Moreover, the geographical distribution of tree-ring samples is wide and has a certain degree of spatial coverage; a tree-ring climate network for a certain density can be established through dendroclimatological study in different regions. Cover shows living tree-ring samples being taken in Wulan and Dulan, in the northeastern Tibetan Plateau. Archaeological wood samples of juniper trees are also collected from tombs and combined with data from living trees. Using the entire chronology, a time series of temperature change for the last 2485 years is reconstructed and new regularities of long-term climate change in this region are revealed (see the article by LIU Yu et al. on page 2986).
|The characteristics and regularities of the climate change over the past millennium in China|
|Research on global climate change has been at the frontier of the contemporary sciences. Discussion and debate about climate warming in the recent century has attracted the attention of the world. Debate has focused on whether the greenhouse effect produced by human activities is a major factor responsible for modern climate warming and whether the warming trend will persist in the future.|
|2011 Vol. 56 (28-29): 2985-2985 [Abstract] ( 90 ) [HTML 1KB] [PDF 377KB] ( 287 )|
|2986||LIU Yu, CAI QiuFang, SONG HuiMing, AN ZhiSheng, Hans W. LINDERHOLM|
|Amplitudes, rates, periodicities and causes of temperature variations in the past 2485 years and future trends over the central-eastern Tibetan Plateau|
|Amplitudes, rates, periodicities, causes and future trends of temperature variations based on tree rings for the past 2485 years on the central-eastern Tibetan Plateau were analyzed. The results showed that extreme climatic events on the Plateau, such as the Medieval Warm Period, Little Ice Age and 20th Century Warming appeared synchronously with those in other places worldwide. The largest amplitude and rate of temperature change occurred during the Eastern Jin Event (343-425 AD), and not in the late 20th century. There were significant cycles of 1324 a, 800 a, 199 a, 110 a and 2-3 a in the 2485-year temperature series. The 1324 a, 800 a, 199 a and 110 a cycles are associated with solar activity, which greatly affects the Earth surface temperature. The long-term trends (>1000 a) of temperature were controlled by the millennium-scale cycle, and amplitudes were dominated by multi-century cycles. Moreover, cold intervals corresponded to sunspot minimums. The prediction indicated that the temperature will decrease in the future until to 2068 AD and then increase again.|
|2011 Vol. 56 (28-29): 2986-2994 [Abstract] ( 318 ) [HTML 1KB] [PDF 749KB] ( 917 )|