發(fā)布時間：2018-05-05 18:20

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

【摘要】：亞洲夏季風(Asian Summer Monsoon,ASM)是全球氣候系統(tǒng)的重要組成部分,對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,科學家利用多種古氣候記錄載體針對ASM的演變進行了大量研究,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時期,MIS 4時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時期北半球夏季太陽輻射強度減弱,冰量上升、海平面下降,是末次冰期中與末次冰盛期相當?shù)牡蜏貢r期,研究這一時段,有助于全面理解末次冰期ASM的演化過程和驅動機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測年上限而一直存在爭議,冰芯時標GICC05在早于60 ka BP時段的誤差已超過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石筍為研究對象,利用高精度的U-Th測年技術和氧穩(wěn)定同位素分析技術建立了MIS 4時期高分辨率的亞洲夏季風演變歷史。通過與全球多種古氣候記錄進行對比探討ASM的變化模式和可能的驅動機制,并且利用誤差小于0.5%的230Th年齡對格陵蘭間冰階(GIS)和H事件的年代進行了精確標定,為冰芯時標的校正提供了參考。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動ASM變化的直接動力。在千年尺度上,JFYK7和XY2石筍δ~(18)O記錄了5個亞洲夏季風偏強時期,分別對應于格陵蘭冰芯記錄的GIS 17-21事件。此外還記錄了3個δ~(18)O偏正的時期分別發(fā)生在59.4-61.5 ka BP,70.9-73.1 ka BP,73.9-75.4 ka BP,這些亞洲夏季風減弱事件也可以在NGRIP記錄中發(fā)現(xiàn)其相對應的冷事件。這表明在千年尺度上,亞洲夏季風主要受北高緯地區(qū)氣候變化的影響。通過與葫蘆洞、山寶洞石筍記錄,阿拉伯海記錄對比發(fā)現(xiàn),盡管存在一些由分辨率和測年誤差導致的差異,總體上在本文研究時段東亞夏季風與印度夏季風在千年尺度上的變化是一致的,可能是由于二者共同響應于北高緯地區(qū)的氣候變化。與南半球巴西石筍記錄對比發(fā)現(xiàn),南美夏季風與亞洲夏季風之間在千年尺度上呈反相對應,可能是熱帶輻合帶(ITCZ)位置的南北移動和Hadley環(huán)流的不對稱變化所致。利用誤差小于0.5%的230Th年代,對GIS 17-21的年代進行了精確標定。與冰芯記錄對比發(fā)現(xiàn),石筍JFYK7記錄的GIS 17的年代與NGRIP在GICC05時標下的記錄在誤差范圍內非常一致,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)生時間早于GICC05modelext冰芯時標,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時標在該時段的精度需要進一步提高,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間分別標定為61.5±0.2 ka BP和59.4±0.2 ka BP。通過對亞洲季風區(qū)各地的古氣候記錄資料分析表明,H6時期亞洲夏季風強度顯著減弱,南亞、中國北方和南方均為降水減少的干旱環(huán)境。GIS 18向H6的轉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,中國石筍記錄以及阿拉伯海巖芯記錄均表現(xiàn)為GIS 18向H6轉變的過程中亞洲夏季風經歷了長達4 ka的緩慢減弱過程,而格陵蘭溫度卻在0.25 ka內迅速降低。通過對比南極冰芯記錄我們推測,這種異�，F(xiàn)象可能是南半球溫度逐漸上升導致的熱帶輻合帶(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.

【學位授予單位】：西南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P532

【參考文獻】

相關期刊論文 前10條

1 張濤濤;李廷勇;韓立銀;程海;李俊云;趙鑫;周菁俐;;MIS 5a/5b時期亞洲夏季風變化的高分辨率石筍記錄[J];中國巖溶;2017年02期

2 姜修洋;楊邦;王曉艷;何堯啟;段福才;李志忠;沈川洲;;黔北洞穴石筍記錄的末次冰消期至早全新世百年～十年際氣候變化[J];地理科學;2015年06期

3 王海波;李廷勇;袁娜;李俊云;;重慶金佛山羊口洞滴水δD和δ~(18)O變化特征及其環(huán)境意義[J];中國巖溶;2014年02期

4 譚明;;信風驅動的中國季風區(qū)石筍δ~(18)O與大尺度溫度場負耦合——從年代際變率到歲差周期的環(huán)流效應(紀念GNIP建網50周年暨葫蘆洞石筍末次冰期記錄發(fā)表10周年)[J];第四紀研究;2011年06期

5 ;On linking climate to Chinese dynastic change: Spatial and temporal variations of monsoonal rain[J];Chinese Science Bulletin;2010年01期

6 何金海;趙平;祝從文;張人禾;湯緒;陳隆勛;周秀驥;;關于東亞副熱帶季風若干問題的討論[J];氣象學報;2008年05期

7 ;High-resolution climate variability of southwest China during 57 70 ka reflected in a stalagmite δ~(18)O record from Xinya Cave[J];Science in China(Series D:Earth Sciences);2007年08期

8 李廷勇;袁道先;李紅春;楊琰;王建力;王昕亞;李俊云;覃嘉銘;張美良;林玉石;;重慶新崖洞XY2石筍δ~(18)O記錄的57～70kaBP古氣候變化及其對D-O和H事件的反映[J];中國科學(D輯:地球科學);2007年06期

9 劉殿兵;汪永進;陳仕濤;;神農架天鵝洞石筍76~58kaB.P.時段DO事件[J];沉積學報;2007年01期

10 趙平;周秀驥;;近40年我國東部降水持續(xù)時間和雨帶移動的年代際變化[J];應用氣象學報;2006年05期

相關博士學位論文 前1條

1 段福才;冰期旋回季風演化規(guī)律及事件基本特征[D];南京師范大學;2014年

相關碩士學位論文 前1條

1 黃帆;高分辨率石筍記錄的重慶地區(qū)60～90 ka BP時段氣候變化研究[D];西南大學;2014年

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