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中國小冰期氣候環(huán)境記錄的區(qū)域性特征及成因分析

發(fā)布時間:2018-06-07 22:28

  本文選題:小冰期冷波段 + 氣候記錄。 參考:《江西師范大學》2014年碩士論文


【摘要】:全球氣候變化研究已然成為各國政治、經(jīng)濟、科學等多個領(lǐng)域關(guān)注的主要內(nèi)容之一。在20世紀的最后20年中,全球變化區(qū)域相應(yīng)研究取得了廣泛而深刻的進展,全球問題與區(qū)域問題的結(jié)合更加明確,并達成了共識:全球性問題的研究需要由區(qū)域研究來完成;區(qū)域性研究必須體現(xiàn)全球問題。同時,集成研究是區(qū)域研究成果上升為全球性問題的重要手段。 小冰期是距離現(xiàn)在最近的全球性寒冷氣候事件,大致由三個冷波動組成。本文通過集成分析國內(nèi)各區(qū)域具有氣候或環(huán)境的明確指向性、年代分辨率較高,表征氣候冷暖干濕等眾多氣候指標記錄,利用Mapinfo追蹤、描述、對比分析全國范圍內(nèi)小冰期環(huán)境演化特征,宏觀地系統(tǒng)地考察中國小冰期以及小冰期內(nèi)部冷波段的始訖年代和氣候特點。結(jié)合影響我國氣候的主要大氣環(huán)流:北大西洋濤動、厄爾尼諾與拉尼娜,太平洋年代際振蕩,初步探討了我國冷暖干濕氣候格局狀況。同時,比較同期南/北大西洋、太平洋、南/北美洲等關(guān)鍵外圍區(qū)域的氣候環(huán)境演化信息。系統(tǒng)闡述我國小冰期氣候事件的表現(xiàn),探討其可能的成因機制及社會影響。研究認為: (1)我國小冰期冷暖階段變化基本趨勢一致,存在三冷加兩暖模式,只不過小冰期內(nèi)部冷波段的起訖時間存在一定差異。中國小冰期內(nèi)部三個冷期分別是:公元1440±20~1520±20、公元1610±10~1720±10、公元1790(或1820±10)~1890。與太陽輻射斯玻勒極小期(Sprer Minimum)、蒙德極小期(MaunderMinimum)、道爾頓極小期(Dalton Minimum)相對應(yīng)。 (2)分別統(tǒng)計我國青藏區(qū)、中部過渡區(qū)、東部區(qū),小冰期、小冰期內(nèi)部各冷波動階段的起訖時間,青藏區(qū)率先進入寒冷期,東部最遲。三個區(qū)域的啟動時間與結(jié)束時間分別依次后延20~50a。論證了青藏高原是我國氣候的啟動區(qū)。同時,,小冰期內(nèi)部亞冷期不同區(qū)域,表現(xiàn)出不同強弱,追蹤多數(shù)重建氣候記錄顯示第二冷期最強,而西南地區(qū)、華南地區(qū)則顯示第三冷期最強。 (3)小冰期期間降水幅度高頻振動,干濕空間分布復雜多變。綜合分析高分辨率氣候指標記錄,繪制全國氣候干濕配置:冷濕型顯著多于冷干型。西北區(qū)(包括新疆、西昆侖山地)、青藏高原地區(qū)、東北地區(qū)、黃河流域、長江中下游及華南地區(qū)表現(xiàn)為冷濕氣候特征,其中尤以西北區(qū)、青藏地區(qū)、江淮流域冷濕氣候特征最為顯著。西南地區(qū)、農(nóng)牧交錯帶(內(nèi)蒙古、陜甘寧與祁連山),以及海河流域降水減弱,氣候干燥,多冷干型,此時印度季風與東亞季風強度均偏弱。該干濕模式符合北大西洋濤動增強、厄爾尼諾占有優(yōu)勢、太平洋年代震蕩指數(shù)處于正相位的氣候響應(yīng)。 (4)整理公元1100~1950年間太陽輻射、火山氣溶膠等數(shù)據(jù)資料,認為太陽活動與火山噴發(fā)共同驅(qū)動作用,是造成的中國小冰期氣候演化的主要原因之一。
[Abstract]:The study of global climate change has become one of the major concerns in politics, economy, science and other fields. In the last 20 years of the 20th century, the regional research on global change has made extensive and profound progress, and the combination of global problems and regional problems has become clearer, and reached a consensus: the study of global issues needs to be completed by regional research; Regional research must reflect global problems. At the same time, integrated research is an important means for regional research to become a global problem. The small ice age is the most recent global cold climate event, which consists of three cold fluctuations. In this paper, by integrating analysis of climate or environment in various regions in China, the climate index records, such as clear directivity of climate or environment, high resolution of years, dry and wet climate, and so on, are described by MapInfo tracing. By comparing and analyzing the environmental evolution characteristics of the small ice age in the whole country, the onset age and climatic characteristics of the cold wave band in China and inside the small ice age are systematically investigated in a macroscopic and systematic way. Combined with the main atmospheric circulation affecting the climate in China: the North Atlantic Oscillation, El Nino and La Nina, and the Pacific Interdecadal Oscillation, the climatic pattern of cold and warm dry and wet in China is preliminarily discussed. At the same time, the climatic and environmental evolution information of key peripheral regions such as the North / South Atlantic, Pacific and South / North America are compared. This paper systematically describes the manifestation of the climatic events of the small ice age in China, and probes into its possible mechanism of formation and social impact. The main results are as follows: 1) the basic trend of the cold and warm phases of the Little Ice Age in China is the same, and there are three cold and two warm modes, but there are some differences in the beginning and ending time of the cold wave bands in the small ice age. The three cold periods in the small ice age of China are: 1440 鹵20 鹵1520 鹵20, 1610 鹵10, 1720 鹵10, 1790 (or 1820 鹵10), 1890 respectively. Corresponding to the solar radiation Sprer minimum, Maunder minimum, Dalton Minimum2).) the beginning and ending times of the cold fluctuation stages in the Qinghai-Tibet region, the central transitional region, the eastern region and the small glacial epoch in China are calculated, respectively, in the Qinghai-Xizang region, the central transitional region, the eastern region and the small glacial epoch, respectively. Qingzang area first entered the cold period, the eastern part of the latest. The start-up time and the end time of the three regions were delayed by 20 ~ 50 a respectively. It is demonstrated that the Qinghai-Tibet Plateau is the starting area of climate in China. At the same time, different regions of the subcooling period within the small ice age show different intensities, and most of the reconstructed climate records show that the second cooling period is the strongest, while the southwest and southern China show the strongest third cooling period. (3) the amplitude of high frequency vibration of precipitation during the small glacial period. The distribution of dry and wet space is complex and changeable. Comprehensive analysis of high resolution climate index records, mapping the national climate dry and wet configuration: cold and wet type is significantly more than cold dry type. Northwest (including Xinjiang, West Kunlun Mountains, Qinghai-Xizang Plateau, Northeast China, Yellow River Basin, Middle and Lower reaches of the Yangtze River and South China) is characterized by cold and wet climate, especially in Northwest China, Qinghai-Tibet region, The characteristics of cold and wet climate in Jianghuai River Basin are the most obvious. In southwest China, the agricultural and pastoral ecotone (Inner Mongolia, Shaanxi-Ganning and Qilian Mountains) and the Haihe River basin have weakened precipitation, dry climate and more cold dry type. At this time, the intensity of Indian monsoon and East Asian monsoon is weak. The dry and wet model is in line with the enhanced North Atlantic Oscillation, the advantage of El Nino, and the positive climate response of the Pacific Oscillation Index. It is considered that the co-driving of solar activity and volcanic eruption is one of the main reasons for the climatic evolution of the small ice age in China.
【學位授予單位】:江西師范大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:P532

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