本文選題：羊口洞 + 氫氧同位素　； 參考：《西南大學(xué)》2015年碩士論文

【摘要】：全球氣候變化一直是當(dāng)今世界廣泛關(guān)注和研究的重大問題,其中全球氣候變暖最為引起人們關(guān)注。全球氣候變暖會導(dǎo)致一系列的生態(tài)環(huán)境問題,威脅社會安全以及人類的生存和可持續(xù)發(fā)展。而導(dǎo)致全球氣候變曖的原因有諸多方面,一方面由于人類的生產(chǎn)活動及現(xiàn)代建設(shè)對氣候的影響；另一方面由于宇宙自然不可抗力的因素。而現(xiàn)今所面臨的氣候變化現(xiàn)狀,無疑是在地球氣候系統(tǒng)本身的自然變化周期上,疊加了人類活動影響所導(dǎo)致的結(jié)果。應(yīng)對全球氣候變化需要在控制人類活動的同時,深刻了解地球氣候系統(tǒng)本身的變化規(guī)律,兩者缺一不可。其中,加強對古氣候的研究則是了解地球氣候系統(tǒng)變化規(guī)律的重要途徑。本文以重慶金佛山羊口洞為主要研究場所,進行連續(xù)監(jiān)測研究。探討了大氣降水一洞穴水氫氧穩(wěn)定同位素的變化特征及氣候意義；結(jié)合ENSO強度和季風(fēng)指數(shù)分析大氣環(huán)流對中國西南季風(fēng)區(qū)大氣降水中氫氧穩(wěn)定同位素組成的影響；分析微量元素含量及比值變化特征以及對現(xiàn)代環(huán)境的響應(yīng)機制,為利用這些指標(biāo)進行古氣候重建提供理論基礎(chǔ),得出如下結(jié)論：(1)羊口洞外大氣降水及洞穴滴水δD和δ18O皆表現(xiàn)出夏秋季偏輕,冬春季偏重的整體趨勢,主要是受降水水汽源地季節(jié)性差異的影響。但受洞穴上覆巖土層的調(diào)蓄作用影響,羊口洞δD和δ18O的季節(jié)變化幅度遠小于大氣降水,且較降水存在明顯滯后性。各監(jiān)測點滴水δD和δ180值季節(jié)變化差異較大,可能受滴水點上覆巖層裂隙管道發(fā)育、覆蓋層厚度、巖溶水滯留時間、形成滴水前的運移路徑、滴水點的高度和滴率、滴水點距離洞穴出入口的距離等多種原因影響。(2)羊口洞所在地區(qū)降水δ180與降水量、氣溫都呈負(fù)相關(guān),表現(xiàn)出“降水量效應(yīng)”和“負(fù)溫度效應(yīng)”。羊口洞滴水δ18O與降水量總體上呈負(fù)相關(guān)關(guān)系,而與溫度的關(guān)系則呈現(xiàn)多樣化：1#、2#、5#、6#監(jiān)測點滴水δ180與水溫、洞溫不具備相關(guān)性；3#點滴水δ180與水溫、洞溫都呈正相關(guān),相關(guān)系數(shù)分別為0.4055,0.3545；4#點滴水δ18O與水溫、洞溫都呈負(fù)相關(guān),相關(guān)系數(shù)分別為-0.3746和-0.4449。溫度相關(guān)性的多樣化與各監(jiān)測點δ18O季節(jié)變化差異較大有關(guān)。(3)羊口洞洞穴滴水δD和δ18O既表現(xiàn)出對降水的繼承性,又存在變異性。但總體而言,羊口洞滴水δD和δ18O的季節(jié)變化不夠明顯,利用羊口洞石筍進行季節(jié)分辨率的古氣候重建可能性較低。但羊口洞洞內(nèi)滴水δID和δ1。O繼承了當(dāng)?shù)卮髿饨邓男畔?羊口洞石筍δ18O可用于重建年際——十年際及更長時間尺度上的古氣候變化。(4)大氣環(huán)流對中國南方季風(fēng)區(qū)降水有重要影響,羊口洞所在的中國南方季風(fēng)區(qū)大氣降水中氫氧穩(wěn)定同位素組成與ENSO表現(xiàn)為正相關(guān)關(guān)系。當(dāng)E1 Nino發(fā)生時,西太平洋副熱帶高壓勢力強盛,西北太平洋季風(fēng)指數(shù)高,導(dǎo)致中國南方地區(qū)大氣降水中氫氧穩(wěn)定同位素值偏重,La Nina發(fā)生時,東南信風(fēng)強,使西南季風(fēng)增強,印度洋季風(fēng)指數(shù)高,降水穩(wěn)定同位素偏輕。此外,過量氘(d)的分析表明不同季節(jié)水汽源地的差異是導(dǎo)致當(dāng)?shù)卮髿饨邓袣溲醴�(wěn)定同位素組成出現(xiàn)明顯季節(jié)差異的主要原因。(5)羊口洞滴水Ca2+、Mg2+、Sr2+含量具有一定的季節(jié)變化特征,表現(xiàn)出雨季高,旱季低的特點。對1#～6#監(jiān)測點進行逐個分析,可發(fā)現(xiàn)羊口洞洞穴滴水Mg/Ca、Sr/Ca具有旱季高、雨季低的特點,羊口洞洞穴滴水元素比值基本受大氣降水控制,能夠反映外界降水的變化。
[Abstract]:Global climate change has been a major issue of widespread concern and research in the world. Global warming is the most important cause of concern. Global warming will lead to a series of ecological environmental problems, threaten social security and human survival and sustainable development. There are many reasons for the global climate warming. Due to the effects of human production and modern construction on the climate, and on the other hand, the nature of the universe is naturally irresistible. The present situation of climate change is undoubtedly the result of the impact of human activity on the natural cycle of the earth's climate system itself. The response to global climate change is required. At the same time, it is indispensable to understand the change law of the earth's climate system itself, and the study of the paleoclimate is an important way to understand the change law of the earth's climate system. In this paper, we take the jinbuddha goats hole in Chongqing as the main research place and carry on the continuous monitoring and study. The change characteristics and climatic significance of Anami hydrogen and oxygen stable isotopes, and the analysis of the influence of the atmospheric circulation on the stable isotope composition of hydrogen and oxygen in the atmospheric precipitation in the southwest monsoon region of China by combining the ENSO intensity and the monsoon index, and analyze the changes in the content and ratio of trace elements and the response mechanism to the modern environment for the use of these indexes. The theoretical basis of climate reconstruction is provided, and the following conclusions are drawn as follows: (1) the atmospheric precipitation and the drop water delta D and delta 18O of the cave are all light in summer and autumn, and the overall trend of winter and spring heavy weight is mainly influenced by the seasonal difference of the water vapor source, but affected by the storage effect of the overlying strata on the caves, the seasons of delta D and delta 18O The variation range is far less than the atmospheric precipitation, and there is a significant lag in the precipitation. The variation of the seasonal variation of delta D and delta 180 value varies greatly, which may be developed by the fractured pipeline of the overlying strata, the thickness of the cover layer, the retention time of the karst water, the migration path before the drip water, the height and drop rate of the drip point and the drop point distance from the cave. (2) the precipitation in the area of the Yang Kou cave is negatively correlated with the precipitation, and the temperature is negatively correlated, showing the "precipitation effect" and "negative temperature effect". The water delta 18O of the sheep mouth hole is negatively correlated with the precipitation, while the relationship with the temperature is diversified: 1#, 2#, 5#, 6# monitoring drops of water delta 180 and water There is no correlation between temperature and cave temperature; 3# drop water [delta] 180 is positively correlated with water temperature and hole temperature, and the correlation coefficient is 0.4055,0.3545, and 4# drops water delta 18O is negatively correlated with water temperature and hole temperature. The correlation coefficient is respectively related to the variation of -0.3746 and -0.4449. temperature correlation with the seasonal variation of delta 18O in each monitoring point. (3) Caves Cave cave. The drop water delta D and delta 18O not only show inheritance and variability to precipitation, but in general, the seasonal variation of delta D and delta 18O in the drip water of the sheep mouth cavity is not obvious, and the palaeoclimate reconstruction with the seasonal resolution of the sheep hole stalagmite is lower. The stalagmite Delta 18O can be used to reconstruct the paleoclimate change on the interannual - ten interannual and longer time scales. (4) the atmospheric circulation has an important influence on the precipitation in the southern monsoon region of China. The stable isotope composition of hydrogen and oxygen isotopes in the atmospheric precipitation in southern China monsoon region located in the Yang Kou cave is positively correlated with the ENSO performance. When E1 Nino occurs, the Western Pacific vice The strong tropical high force and high monsoon index in the Northwest Pacific lead to the heavy hydrogen oxygen stable isotope value in the atmospheric precipitation in southern China. When La Nina occurs, the southeast monsoon is strong, the southwest monsoon is enhanced, the India Ocean monsoon index is high and the precipitation stable isotope is light. In addition, the analysis of excess deuterium (d) shows the difference of the water vapor source in different seasons. The difference is the main reason for the obvious seasonal differences in the composition of hydrogen and oxygen stable isotopes in local atmospheric precipitation. (5) the content of Ca2+, Mg2+ and Sr2+ in the drip water of Yang Kou cave has a certain seasonal variation characteristic, showing the characteristics of high rainy season and low dry season. The analysis of 1# to 6# monitoring points can be found that the drip of the cave of the sheep hole cave is Mg/Ca, and Sr/Ca has drought. With the characteristics of high season and low rainy season, the element ratio of dripping water in Yang Kou cave is basically controlled by precipitation and can reflect the change of external precipitation.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P532;P592

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