發(fā)布時間：2018-06-18 19:53

  本文選題：青藏高原 + 紅原泥炭　； 參考：《華東師范大學(xué)》2017年碩士論文

【摘要】：紅原泥炭位于青藏高原東部四川省西北地區(qū),當?shù)貧夂蛏钍芪髂霞撅L(fēng)影響。通過對青藏高原東部地區(qū)紅原泥炭的燒失量、地球化學(xué)元素、總汞含量以及色度指標的研究,認為紅原泥炭的各項指標能夠很好地反映紅原泥炭地區(qū)7380年以來的環(huán)境變化特征。不同的代用指標中反映了多次氣候變冷事件,分別發(fā)生在7200、6300、5200、4500、4200-4000、3400～3200、1800～1600 yrBP。除去2000～1620 yrBP時間段的人為因素干擾之外,可以將7380～2000yrBP分為四個階段:(1)7380～6500yr BP,暖濕增強氣候波動劇烈階段;(2)6500～5100 yr BP,向冷干發(fā)展氣候變化平穩(wěn);(3)5100～4000 yrBP,持續(xù)向冷干方向發(fā)展,氣候波動明顯;(4)4000～2000 yrBP,溫度變化平穩(wěn),濕度波動明顯。紅原泥炭總汞含量和燒失量周期分析表明:紅原地區(qū)存在2500、1250、910、550、420、360、310、280、200、160、125和75年準周期,這些周期在太陽活動變化、太陽軌道周期變化以及西南季風(fēng)周期中都具有一定體現(xiàn)。青藏高原的加熱作用會影響季風(fēng)的強度,太陽輻射量對青藏高原的加熱作用強度具有重要意義。總汞含量和燒失量的變化趨勢與太陽輻射軌道周期變化規(guī)律一致,紅原泥炭顯示的7200、6800、5400、4600、4200、3300以及2700 yr BP變冷事件都對應(yīng)了太陽輻射量的大幅度減弱,印度河河口沉積物δ18O含量與燒失量和總汞含量的變化趨勢具有很高的一致性,證明太陽輻射變化的確能改變西南季風(fēng)的強度。
[Abstract]:The red peat is located in the northwest of Sichuan Province in the eastern part of Qinghai-Xizang Plateau, and the local climate is deeply influenced by the southwest monsoon. Based on the study of the loss of red peat, geochemical elements, total mercury content and chromaticity index in the eastern part of Qinghai-Xizang Plateau, it is concluded that each index of red peat can well reflect the characteristics of environmental changes in the region since 7380 years. A number of climatic cooling events were reflected in different proxy indices, which occurred in 7200 ~ 6300 ~ 5200 ~ 4500 ~ 4200-4000m ~ 3200 ~ 1800 ~ 1600 ~ 1600yrBP, respectively. In addition to the interference of human factors in the period of 2000 ~ 1620 yrBP, 7380 / 2000yrBP can be divided into four stages: 1: 1 / 1 / 733 80 / 6500yr BP, 26.500 / 5100yr BPs during the intense climate fluctuation stage, 35100000 yrBPs, 35100000 yrBPs, and 351004000yrBPs, which continue to develop in the direction of cold drying. The climate fluctuation is obvious, the temperature change is stable and the humidity fluctuates obviously. The analysis of the total mercury content and the period of burning loss of peat in Hongyuan shows that there are 2500N 12509105504203310280200160125 and 75 years quasi periods in Hongyuan area. These periods are reflected in the changes of solar activity, the cycle of solar orbit and the cycle of southwest monsoon. The heating of the Qinghai-Tibet Plateau will affect the intensity of the monsoon, and the amount of solar radiation is of great significance to the intensity of the heating over the Qinghai-Xizang Plateau. The variation trend of total mercury content and loss of total mercury is consistent with the periodic variation of solar radiation orbit. The cooling events of 7200 ~ 6800 ~ 5400 ~ 4400 ~ 4200 ~ 4200 ~ 3300 and 2700 YR BP indicate that the solar radiation decreases greatly in the red peat. The variation trend of 未 18O content in the sediments of the Indus estuary is very consistent with that of the burning loss and the total mercury content, which proves that the solar radiation change can change the intensity of the southwest monsoon.
【學(xué)位授予單位】：華東師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P532

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本文編號：2036672