Cenozoic uplift of the impact of global climate ch

yxfbbiedtj · Wysłany: Śro 15:59, 30 Mar 2011

Cenozoic uplift of the impact of global climate change

Chemical weathering can use seawater strontium isotope ratios to illustrate the tangled in sr/66Sr, STSr, ~ Sr ratios are used to reshape the history of an important role in continental weathering. Cenozoic marine STSr/S6Sr increase the ratio of growth and chemical weathering occur simultaneously, strontium traffic growth over the past 4Ma 4O%, Himalayan rivers SVSr, ~ Sr ratios from the Oligocene to the present global average increase of 0.7127 0.7105 This growth is due to strontium isotopes caused by uplift caused by chemical weathering of continental rocks. Accompanied by the chemical weathering of the altitude are more intense physical weathering of rock. Directly produced by the uplift of Tibetan Plateau uplift on the impact of global climate change, the new generation born of Bengal Fan, Indian River fan delta deposits Himalayas south of the total land and add up all the rough statistics, a total of 200 × 100, if these sediments back to the plateau, the average plateau current heightening 3500m. Moreover, these sediments are deposited only in the southern margin of the Tibetan Plateau. Physical weathering of rock plateau exacerbated the intensity of chemical weathering, weathering of rocks on the Tibetan Plateau result of global climate change is important. 3.3 organic carbon burial and silicate rocks in addition to plant photosynthesis and the consumption of chemical weathering of carbonate rocks in atmospheric CQ, the organic carbon burial and the role of plant light sets the atmosphere in the Tibetan Plateau during the 002 also play an important role in the uptake . Since the Phanerozoic about 2O% of the carbon is organic carbon burial consumption, intake of the new generation of atmospheric organic carbon burial C (h rate of 1.2 × 10mol / a, total of 78 × 1018tool. Uplift of the plateau during the plant consumption of the atmosphere through photosynthesis, C (h, the reaction is essentially biochemical weathering of silicate rocks, the process of a reaction increased the uptake of atmospheric. 3.4 uplift of the plateau is too continental ice sheets to promote the formation of the Tibetan Plateau uplift the impact of the global atmospheric circulation and through chemical and biochemical weathering of rock consume large amounts of atmospheric C02, 3Ma ago when the Atlantic waters to the average temperature is about 3 ~ 4 ℃,[link widoczny dla zalogowanych], then the northern hemisphere has become cold enough. Qianwen Yi described in ago 36Ma, l5Ma and 2.5Ma, due to global cooling Pat-Tibetan Plateau in the high latitudes of the Earth pull the formation of two glaciers, began to experience periodic Ice Age. the emergence of each of the Ice Age, the formation of thousands of miles wide, lkm ~ 3km thick ice sheet. in the glacial period, the water is fixed in the ice, down to the present sea level 120m below. the formation of glaciers not only hinder the investment process of chemical weathering of rocks, but also accelerate the chemical weathering of silicate rocks to further accelerate the consumption of the atmosphere 002, to further the global climate becomes colder. (the closing date :1998-05 to be a l1) 4 Conclusion and discussion uplift of the northern hemisphere and even a major impact on global atmospheric circulation, and its dynamic role block the east-west mid-latitude surface air to promote air flow to the right deflection, the formation of the plateau circulation; its role in the summer heat the formation of the plateau surface pressure, dry air rising, while in other parts of the formation of ground pressure, sinking air in winter, since the opposite effect, strengthened monsoon circulation, the southern slope of the Himalayas form a strong rain band, and affect the global atmospheric circulation and environmental change. exacerbated by rapid uplift of the Tibetan Plateau strong chemical weathering of surface rocks, organic carbon burial and uplift of the photosynthesis of plants These effects of the new generation of strong consumption of 002 global atmosphere, the formation of very warm in the Northern Hemisphere ice sheets exist only in large-scale Greenland, the North Atlantic surface waters warm. However, from the long perspective, the impact of glacial plateau uplift movement still exists, the cycle of glacial activity has also continued to class adding greenhouse gases to become a factor. If the greenhouse effect did occur, it will form a completely different global cooling over the past 40Ma to the environment. In the past, major climate change is accompanied by large-scale topographic changes in the pattern changes and the mainland; now , OO2 content increased, not dependent on major geographical changes. and before the international earth science community has realized that the Tibetan Plateau is the promoter region of global climate change, global change research is one of key regions, Tibetan Plateau is a new generation of global climate change and global key drivers of significant deterioration. Therefore, forecasting future climate need to consider a variety of Earth influence climate factors, which reveal the uplift of the plateau and the relationship between climate change will be an important aspect. Editor Zhao Steel 33