【摘要】：通過對雙池瑪珥湖804 cm的沉積巖心進行含水量、干密度、粒度、磁化率、干濕色度、色度、有機碳氮含量及其同位素的測試分析,結(jié)合210Pb、137Cs、AMS14C的分析測試結(jié)果,重建了湖區(qū)7kaBP以來的氣候環(huán)境演變歷史。7～1.4 ka BP湖盆為沼澤相沉積,期間主要分為以下兩個階段:7056～6615 cal a BP,氣候相對溫和濕潤;6615～1413 cal a BP,該階段有效降水先減少后增加,氣候總體表現(xiàn)為干熱。1.4kaBP以來為淺湖沉積環(huán)境,該時期降水先增加后減少,整體氣候相對涼干,該階段磁化率的增加指示著人類活動的增強。巖心記錄的近1500年來的氣候變化,能夠識別出較為干旱的MWP(約900～1200 AD)和相對濕潤的LIA(約1300～1750 AD),MWP較干旱的氣候環(huán)境與中國南方湖泊的沉積記錄相一致性。在7～3 kaBP期間,湖盆氣候逐漸干旱,這種變化趨勢受控于太陽輻射和ITCZ的移動。晚全新世氣候變化可與ENSO變化進行對比,近1500年指標時間序列存在6～8 a,18～20 a,88 a,103 a,215 a的周期,與ENSO和太陽活動的周期相對應(yīng)。
[Abstract]:The moisture content, dry density, granularity, magnetic susceptibility, dry-wet chromaticity, organic carbon and nitrogen content and their isotopes in the sedimentary cores of 804 cm in Maer Lake, Shuangchi were measured and analyzed. The history of climatic and environmental evolution since 7kaBP has been reconstructed. The lake basin of 70.1.4 ka BP is a marsh sedimentary facies, which is mainly divided into two stages: 7056 cal a BP, climate is relatively mild and humid, and the effective precipitation at 6615 ~ 1413 cal a BP, decreases first and then increases. The climate is dry and hot. Since 1.4kaBP, the precipitation first increased and then decreased, and the whole climate was relatively cool and dry. The increase of magnetic susceptibility indicates the enhancement of human activities. The climate change recorded in the core over the past 1500 years can identify the relatively arid MWP (about 900 ~ 1 200 AD) and the relatively humid climate environment of LIA (about 1 300 ~ 1 750 AD), MWP), which are consistent with the sedimentary records of the southern lakes in China. During the period of 7 ~ 3 kaBP, the climate of the lake basin was gradually dry, which was controlled by the solar radiation and the movement of ITCZ. The late Holocene climate change can be compared with the ENSO change. In the last 1500 years, the index time series has a period of 6 ~ (8) a ~ (18) ~ (18) ~ (18) a ~ (88) a ~ (10 ~ 3) a ~ (2) a ~ 215a, corresponding to the period of ENSO and solar activity.
【學(xué)位授予單位】：中國地質(zhì)科學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P532

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