本文選題：末次冰消期　切入點(diǎn)：粒度　出處：《科學(xué)通報(bào)》2016年33期 　論文類型：期刊論文

【摘要】：亞洲季風(fēng)和西風(fēng)作為北半球重要的大氣環(huán)流系統(tǒng),對(duì)青藏高原冰川進(jìn)退、水量平衡及生態(tài)環(huán)境變化具有重要意義.大量研究重建了兩者的強(qiáng)弱變化,但是末次冰消期以來(lái),西風(fēng)與亞洲季風(fēng)強(qiáng)度變化仍然存在爭(zhēng)議.青藏高原中部令戈錯(cuò)湖泊巖芯樣品重建的末次冰消期以來(lái)令戈錯(cuò)粒度與介形蟲氧同位素記錄表明,17~11.7 ka,令戈錯(cuò)水位較淺且波動(dòng)頻繁,西風(fēng)是氣候變化的主要影響因素,研究區(qū)環(huán)境變化與北大西洋冷事件關(guān)系密切;11.7~10ka,對(duì)應(yīng)于印度季風(fēng)的增強(qiáng),令戈錯(cuò)水位迅速升高,冬季風(fēng)力變小,印度季風(fēng)取代西風(fēng)成為控制環(huán)境變化的主要因素;10~8 ka之后,令戈錯(cuò)水位略有降低,可能對(duì)應(yīng)于印度季風(fēng)的減弱或者冰川融水的減少;8 ka之后,響應(yīng)于印度季風(fēng)逐漸減小,令戈錯(cuò)逐漸萎縮,西風(fēng)可能存在增強(qiáng).末次冰消期以來(lái)西風(fēng)與印度季風(fēng)強(qiáng)弱演替歷史可以歸納為:16.5 ka之前,中緯度西風(fēng)強(qiáng)盛,青藏高原大部分區(qū)域均由西風(fēng)控制,與北大西洋氣候變化表現(xiàn)出較好的耦合關(guān)系;16.5~11.5 ka氣候格局與現(xiàn)今類似,西風(fēng)控制著青藏高原中-北部地區(qū),而青藏高原南部受印度季風(fēng)影響更大.早中全新世,夏季太陽(yáng)輻射增加,印度季風(fēng)增強(qiáng);晚全新世,印度季風(fēng)減弱,西風(fēng)可能對(duì)青藏高原西部以及北部存在影響.
[Abstract]:As an important atmospheric circulation system in the Northern Hemisphere, Asian monsoon and westerly are of great significance for glacier advance and retreat, water balance and ecological environment change over the Qinghai-Xizang Plateau. The variation of the intensity of westerly and Asian monsoon is still controversial. The grain size and oxygen isotopic records of ostracoda in the core of Linggocha lake in central Qinghai-Xizang Plateau since the last ice elimination period show that the water level of Gejiao is shallow and fluctuates frequently. The westerly wind is the main influence factor of climate change. The environmental change in the study area is closely related to the cold events in the North Atlantic, corresponding to the strengthening of the Indian monsoon, which makes the Gobo water level rise rapidly and the wind intensity decrease in winter. After the Indian monsoon replaced the westerly wind as the main factor to control the environmental change, the Gobo water level decreased slightly after 108ka, which may correspond to the weakening of the Indian monsoon or the decrease of glacial melt water, which is in response to the gradual decrease of the Indian monsoon. Since the last ice extinction period, the succession history of the west wind and the Indian monsoon strength and weakness can be summed up as: before 1: 16.5 ka, the mid-latitude westerly was strong, and most areas of the Qinghai-Xizang Plateau were controlled by the west wind. There is a good coupling relationship with climate change in the North Atlantic. The climatic pattern is similar to that of the present one. The westerly wind controls the central and northern regions of the Tibetan Plateau, while the southern part of the Tibetan Plateau is more affected by the Indian monsoon. The summer solar radiation increases and the Indian monsoon intensifies, and in the late Holocene, the Indian monsoon weakens, and the westerly wind may have an impact on the western and northern parts of the Qinghai-Xizang Plateau.
【作者單位】： 中國(guó)地質(zhì)大學(xué)地球科學(xué)學(xué)院;中國(guó)科學(xué)院青藏高原研究所環(huán)境變化與地表過程重點(diǎn)實(shí)驗(yàn)室;Large
【基金】：中國(guó)科學(xué)院戰(zhàn)略性先導(dǎo)科技研究計(jì)劃B類項(xiàng)目(XDB01020300) 國(guó)家自然科學(xué)基金(41230523)資助
【分類號(hào)】：P532

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