【摘要】：選擇青藏高原腹地可可西里地區(qū)為研究區(qū),通過對湖泊沉積物色度、磁化率、總有機(jī)碳和粒度等分析,對可可西里地區(qū)末次間冰期以來的氣候演變形式進(jìn)行了恢復(fù),其演化階段大致可以與深海氧同位素進(jìn)行對比。可可西里地區(qū)氣候變化既表現(xiàn)出與全球氣候變化一致的特點(diǎn),也存在著獨(dú)特的區(qū)域特征。末次間冰期氣候波動(dòng)可以和深海氧同位素相比,也可劃分出5個(gè)亞段,但兩者的波動(dòng)形式存在差異,深海氧同位素指示5e最暖,而本區(qū)氣候可能在5a暖濕配置最好;末次冰期氣候環(huán)境整體較差,只有在間冰階湖泊水體略有增大,總有機(jī)碳也呈小的峰值,色度和磁化率的峰值較高,對應(yīng)于3c和3a的兩個(gè)暖期,說明此時(shí)段較為溫暖,但濕度較差。可能受到構(gòu)造運(yùn)動(dòng)的影響湖泊水體縮小,水動(dòng)力增大的緣故,相應(yīng)的沉積條件較差,導(dǎo)致總有機(jī)碳含量較低。其他時(shí)段各指標(biāo)均為低值顯示氣候較為寒冷,只出現(xiàn)一些小的峰值可能與Dansgaard-Oeschger旋回一致。直至1萬年以來,各指標(biāo)呈增大趨勢,可能與全新世氣候增暖濕有關(guān)。
[Abstract]:In this paper, the hinterland of the Qinghai-Xizang Plateau is selected as the study area. By analyzing the chromaticity, magnetic susceptibility, total organic carbon and particle size of the lake sediments, the climatic evolution forms since the last interglacial period in the Hoh Xili region are restored. Its evolution stage can be compared with deep sea oxygen isotopes. The climate change in Hohsili region is not only consistent with global climate change, but also has unique regional characteristics. The last interglacial climatic fluctuation can be compared with deep-sea oxygen isotopes and can also be divided into five subsections, but there are differences in their fluctuation forms. Deep-sea oxygen isotopes indicate that 5e is the warmest, and the climate in this area may be the best in 5 years. The climatic environment of the last glacial epoch was poor, only the lake water increased slightly in the interglacial terrace, the total organic carbon also showed a small peak value, the peak value of chrominance and magnetic susceptibility was higher, corresponding to the two warm periods of 3C and 3a, which indicated that the period was warmer. But the humidity is poor. As a result of the decrease of water body and the increase of hydrodynamic force, the deposition conditions may be poor, resulting in the low content of total organic carbon (TOC). In other periods, all the indicators are low, indicating the colder climate, and only a few small peaks may be consistent with the Dansgaard-Oeschger cycle. Up to 10,000 years, the indexes showed an increasing trend, which may be related to the warming and humidity of the Holocene climate.
【作者單位】： 山西師范大學(xué)地理科學(xué)學(xué)院;蘭州大學(xué)資源環(huán)境學(xué)院冰川與生態(tài)地理研究所;陜西師范大學(xué)旅游與環(huán)境學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(40871057,41401226)
【分類號】：P532

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