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Evidence for solar forcing of climate variation from δ^(18)O of peat cellulose

Science China Earth Sciences 2000年第2期43卷 217-225页

作者：洪业汤刘东生姜洪波周立平洪冰朱泳煊李汉鼎冷雪天秦小光王羽林庆华曾毅强 1. State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences 550002 Guiyang China 2. Institute of Geology Chinese Academy of Sciences 100029 Beijing China 3. The Godwin Laboratory Department of Earth Sciences University of Cambridge Pembroke Street CB2 3SA Cambridge UK 4. EAWAG Ueberlandstrasse 133 CH-8600 Duebendorf Switzerland 5. Institute of Peatmire Northeast Normal University 130024 Changchun China

There have been a number of investigations for examining the possible link between long-term climate variability and solar activity. A continuous δ18O record of peat cellulose covering the past 6 000 years and the response of climate variation inferred from the proxy record to solar forcing are reported. Results show that during the past 5 000 years the abrupt climate variations, including 17 warming and 17 cooling, and a serious of periodicities, such as 86, 101, 110,127, 132, 140, 155, 207, 245, 311, 820 and 1 050 years, are strikingly correlative to the changes of solar irradiation and periodicity. These observations are considered as further evidence for a close relationship between solar activity and climate variations on time scales of decades to centuries.

关键词： solar variability climatic change peat δ18O radiocarbon anomalies.

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Several characteristics of contemporary climate change in the Tibetan Plateau

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Science China Earth Sciences 2001年第S1期44卷 410-420页

作者：朱文琴陈隆勋周自江 Chinese Acad Meteorol Sci Beijing 100081 Peoples R China Natl Meteorol Ctr China Beijing 100081 Peoples R China

Characteristics of contemporary climate change in the Tibetan Plateau have been investigated based on the observational data of monthly mean air temperature, monthly mean maximum and minimum air temperatures, and precipitation amount at 217 stations in the Plateau and its adjacent areas in 1951-1998, in which the temperature data at Lhasa, Lanzhou, Kunming and Chengdu were extended to a period of 1935-1950. The following conclusions can be drawn. (1) The air temperature in the Tibetan Plateau decreased from the 1950s to the 1960s, afterwards it began warming up to the 1990s. The data at the Lhasa Station beginning from 1935 have indicated that the air temperature at the station was the highest in the 1940s, then it became cooling until the 1960s. After the 1960s, it began warming until the 1990s. However, the air temperature at Lhasa in the 1990s still did not reach as high as in the 1940s. (2) Since the 1960s, there has existed a cooling belt below 3000 m altitude above sea level, which is located in eastern and southeastern Tibetan Plateau, and there has existed a strong warming belt from south to north in 85-95°E. Because there are very nonhomogeneous and positive-negative alternating changes between cooling and warming belts, the air temperature is not linearly increased with increasing height. (3) Since the 1960s, there has existed a precipitation decreasing belt distributed over southwestern to northeastern Plateau as well as over a below 3000 m a.s.l. area in southeastern Plateau. The warming with decreasing precipitation occurs in the central area of the Plateau and the above 3000 m western Plateau; the warming with increasing precipitation occurs in the northern and southern Plateau; and the cooling with decreasing precipitation occurs in the below 3000 m southeastern Plateau.

关键词： climate change in China air temperature and precipitation maximum and minimum air temperatures annual mean air temperature anomalies.

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THE MULTIPLE EQUILIBRIA IN THE COUPLED ATMOSPHERE-OCEAN SYSTEM

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Science China Chemistry 1989年第3期32卷 361-370页

作者：金飞飞朱抱真 Institute of Atmospheric Physics Academia Sinica Beijing

In this paper, a topography forced quasi-geostrophic baroclinic model and an SST (sea surface temperature) equation are used to set up a simple coupled atmosphere-ocean model The large-scale ocean current is nearly the Sverdrup flow. Two basic processes are considered in this system, i. e. the SST as a thermal forcing drives the atmospheric circulation and the ocean current produced by the wind redistributes the SST. Highly truncating and multiple scale method are used to simplify the model and obtain a low dimensional dynamic system. In this part, the qualitative vector in the phase space of the system is analysed and two stable equilibria are obtained. These two kinds of equailibria may be used to explain some features of the long-range anomalies.of circulation.

关键词： multiple equilibria air-sea coupled system seasonal variation of SST anomalies.

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