本文選題：亞洲夏季風(fēng) + 石筍　； 參考：《西南大學(xué)》2017年碩士論文

【摘要】：亞洲夏季風(fēng)(Asian Summer Monsoon,ASM)是全球氣候系統(tǒng)的重要組成部分,對(duì)于溝通南北半球氣候變化之間的聯(lián)系具有重要作用。近十幾年來,科學(xué)家利用多種古氣候記錄載體針對(duì)ASM的演變進(jìn)行了大量研究,然而,這其中高分辨率且具有精確定年的石筍記錄主要集中于深海氧同位素階段(Marine Oxygen Isotope Stages,MIS)1-3時(shí)期,MIS 4時(shí)期的石筍記錄多存在分辨率較低或記錄不完整等不足。MIS 4時(shí)期北半球夏季太陽輻射強(qiáng)度減弱,冰量上升、海平面下降,是末次冰期中與末次冰盛期相當(dāng)?shù)牡蜏貢r(shí)期,研究這一時(shí)段,有助于全面理解末次冰期ASM的演化過程和驅(qū)動(dòng)機(jī)制及其在全球氣候系統(tǒng)中所起的作用。此外,最初發(fā)現(xiàn)于北大西洋沉積物巖芯記錄的Heinrich(H)6事件的年代由于超過14C測(cè)年上限而一直存在爭(zhēng)議,冰芯時(shí)標(biāo)GICC05在早于60 ka BP時(shí)段的誤差已超過2600年,急需得到校正。本文以采自重慶市南川區(qū)金佛山羊口洞的JFYK7石筍和奉節(jié)縣新崖洞的XY2石筍為研究對(duì)象,利用高精度的U-Th測(cè)年技術(shù)和氧穩(wěn)定同位素分析技術(shù)建立了MIS 4時(shí)期高分辨率的亞洲夏季風(fēng)演變歷史。通過與全球多種古氣候記錄進(jìn)行對(duì)比探討ASM的變化模式和可能的驅(qū)動(dòng)機(jī)制,并且利用誤差小于0.5%的230Th年齡對(duì)格陵蘭間冰階(GIS)和H事件的年代進(jìn)行了精確標(biāo)定,為冰芯時(shí)標(biāo)的校正提供了參考。通過分析石筍JFYK7和XY2的δ~(18)O記錄發(fā)現(xiàn),在本文研究時(shí)段盡管在千年尺度上ASM變化與北緯30°夏季太陽輻射變化存在差異,但在軌道尺度上夏季太陽輻射仍是驅(qū)動(dòng)ASM變化的直接動(dòng)力。在千年尺度上,JFYK7和XY2石筍δ~(18)O記錄了5個(gè)亞洲夏季風(fēng)偏強(qiáng)時(shí)期,分別對(duì)應(yīng)于格陵蘭冰芯記錄的GIS 17-21事件。此外還記錄了3個(gè)δ~(18)O偏正的時(shí)期分別發(fā)生在59.4-61.5 ka BP,70.9-73.1 ka BP,73.9-75.4 ka BP,這些亞洲夏季風(fēng)減弱事件也可以在NGRIP記錄中發(fā)現(xiàn)其相對(duì)應(yīng)的冷事件。這表明在千年尺度上,亞洲夏季風(fēng)主要受北高緯地區(qū)氣候變化的影響。通過與葫蘆洞、山寶洞石筍記錄,阿拉伯海記錄對(duì)比發(fā)現(xiàn),盡管存在一些由分辨率和測(cè)年誤差導(dǎo)致的差異,總體上在本文研究時(shí)段東亞夏季風(fēng)與印度夏季風(fēng)在千年尺度上的變化是一致的,可能是由于二者共同響應(yīng)于北高緯地區(qū)的氣候變化。與南半球巴西石筍記錄對(duì)比發(fā)現(xiàn),南美夏季風(fēng)與亞洲夏季風(fēng)之間在千年尺度上呈反相對(duì)應(yīng),可能是熱帶輻合帶(ITCZ)位置的南北移動(dòng)和Hadley環(huán)流的不對(duì)稱變化所致。利用誤差小于0.5%的230Th年代,對(duì)GIS 17-21的年代進(jìn)行了精確標(biāo)定。與冰芯記錄對(duì)比發(fā)現(xiàn),石筍JFYK7記錄的GIS 17的年代與NGRIP在GICC05時(shí)標(biāo)下的記錄在誤差范圍內(nèi)非常一致,這也得到ASM地區(qū)其他石筍記錄的支持。石筍記錄的GIS 18的發(fā)生時(shí)間早于GICC05modelext冰芯時(shí)標(biāo),而在GIS 19-21的年代上石筍記錄又晚于冰芯記錄。這說明冰芯GICC05modelext時(shí)標(biāo)在該時(shí)段的精度需要進(jìn)一步提高,而石筍記錄可以為其提供參考。石筍JFYK7和XY2清晰記錄了H6事件,這是在AS M地區(qū)的石筍記錄中首次完整地發(fā)現(xiàn)H6事件,本文精確地將其起止時(shí)間分別標(biāo)定為61.5±0.2 ka BP和59.4±0.2 ka BP。通過對(duì)亞洲季風(fēng)區(qū)各地的古氣候記錄資料分析表明,H6時(shí)期亞洲夏季風(fēng)強(qiáng)度顯著減弱,南亞、中國(guó)北方和南方均為降水減少的干旱環(huán)境。GIS 18向H6的轉(zhuǎn)換過程在格陵蘭冰芯記錄和北半球中低緯度地區(qū)的古氣候記錄中存在顯著差異,中國(guó)石筍記錄以及阿拉伯海巖芯記錄均表現(xiàn)為GIS 18向H6轉(zhuǎn)變的過程中亞洲夏季風(fēng)經(jīng)歷了長(zhǎng)達(dá)4 ka的緩慢減弱過程,而格陵蘭溫度卻在0.25 ka內(nèi)迅速降低。通過對(duì)比南極冰芯記錄我們推測(cè),這種異常現(xiàn)象可能是南半球溫度逐漸上升導(dǎo)致的熱帶輻合帶(ITCZ)位置南移以及跨赤道氣流減弱造成的。
[Abstract]:The Asian Summer Monsoon (ASM) is an important part of the global climate system. It plays an important role in communication between the climate changes in the northern and southern hemispheres. In the past decade, scientists have used a variety of paleoclimate records to study the evolution of ASM. However, the high resolution and precise determination of ASM has been made. The record of Stalagmite in the year is mainly concentrated in the period of the Marine Oxygen Isotope Stages (MIS) 1-3. The record of Stalagmite in the period of MIS 4 has many low resolution or incomplete records. The summer solar radiation intensity in the northern hemisphere of the northern hemisphere is weakened, the amount of ice rises, and the sea level falls, which is the phase of the last glacial and the last glacial period. During the low temperature period, the study of this period will help to understand the evolution and driving mechanism of ASM in the last glacial period and its role in the global climate system. In addition, the Heinrich (H) 6 event, which was first discovered in the North Atlantic sediment core, has been disputed over the upper limit of the 14C dating, and the ice core GIC The error of C05 in the period of 60 Ka BP is more than 2600, and it is urgent to be corrected. In this paper, the JFYK7 stalagmite from Jinfu goats cave in Chongqing Nanchuan district and the XY2 stalagmite of the new cliff cave in Fengjie county were studied. The high resolution Asian summer summer of the period of the MIS 4 period was established by high precision U-Th dating technique and oxygen stable isotope analysis technique. The history of wind evolution. By comparing the variation patterns and possible driving mechanisms of ASM with a variety of paleoclimate records in the world, and using the 230Th age of less than 0.5% of the error, the age of the ice order (GIS) and H events of Greenland is calibrated accurately, which provides a reference for the calibration of the ice core time mark. By analyzing the delta ~ (1) of the JFYK7 and XY2 of the stalagmite. 8) O records found that in the study period, although there is a difference between the ASM changes on the Millennium scale and the summer solar radiation in the north latitude 30 degrees, the solar radiation in the orbital scale is still the direct driving force to drive the change of ASM. On the Millennium scale, the JFYK7 and XY2 stalagmite delta ~ (18) recorded 5 Asian summer monsoon strong periods, corresponding to the lattice, respectively. The GIS 17-21 event recorded by the Ling LAN ice core. In addition, 3 delta ~ (18) O deviation periods are recorded in 59.4-61.5 Ka BP, 70.9-73.1 Ka BP, 73.9-75.4 Ka BP. These Asian summer monsoon weakening events can also be found in the NGRIP records of their corresponding cold events. This indicates that the Asian summer monsoon is mainly North High Latitude on the Millennium scale. The effect of climate change in the region. Through the record of the Stalagmite in Hulu cave and the mountain treasure cave, the Arabia sea record contrasts that, although there are some differences caused by the resolution and the dating error, the East Asian summer monsoon and the India summer monsoon are in accordance with the variation in the Millennium scale in this study period, which may be due to the common response of the two. The climate change in the northern high latitude region. Compared with the Brazil stalagmite records in the southern hemisphere, the South American Summer Monsoon and the Asian summer monsoon are opposite to the Millennium scale, which may be caused by the North-South movement of the tropical convergence zone (ITCZ) and the asymmetrical change in the Hadley circulation. Using the 230Th age of less than 0.5% error, the age of GIS 17-21 Accurate calibration. Compared with ice core records, it was found that the age of GIS 17 recorded by stalagmite JFYK7 was very consistent with the record of NGRIP at GICC05, which was also supported by other stalagmite records in ASM area. The time of GIS 18 recorded in the stalagmite was earlier than that of GICC05modelext ice core, but in the age of GIS 19-21, the stalagmite was in the age of GIS 19-21. The record is later than the ice core record. This indicates that the precision of the ice core GICC05modelext at this time period needs to be further improved, and the stalagmite record can provide reference for it. The stalagmite JFYK7 and XY2 clearly record the H6 events. This is the first complete discovery of H6 events in the stalagmite records in the AS M region. This article accurately demarcate its starting time. The analysis of paleoclimate records of 61.5 + 0.2 Ka BP and 59.4 + 0.2 Ka BP. showed that the Asian summer monsoon intensity decreased significantly during the H6 period, South Asia, North and South China were all precipitation decreasing arid environment.GIS 18 to H6 in Greenland ice core record and middle and low latitudes of northern hemisphere palaeoatmosphere. There are significant differences in the waiting record. China's stalagmite records and Arabia Hai Yan core record that the Asian summer monsoon experienced a slow decline of 4 Ka during the transition from GIS 18 to H6, while the Greenland temperature decreased rapidly within 0.25 Ka. By comparing Antarctic ice cores, we speculate that this anomaly may be South half The gradual increase in the temperature of the sphere results in the southward movement of the tropical convergence zone (ITCZ) and the weakening of the cross equatorial flow.

【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P532

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本文編號(hào)：1848789