a国产,中文字幕久久波多野结衣AV,欧美粗大猛烈老熟妇,女人av天堂

當(dāng)前位置:主頁 > 科技論文 > 地質(zhì)論文 >

基于EEMD方法的全新世亞洲季風(fēng)石筍氧碳同位素對比研究

發(fā)布時間:2018-04-14 11:14

  本文選題:集合經(jīng)驗(yàn)?zāi)B(tài)分解(EEMD) + 全新世; 參考:《地理研究》2017年08期


【摘要】:采用集合經(jīng)驗(yàn)?zāi)B(tài)分解方法(EEMD),對貴州省董哥洞全新世石筍δ~(18)O、δ~(13)C記錄進(jìn)行多尺度分解,分別獲得8、9個本征模分量。在254 a以下尺度上,石筍δ~(13)C和δ~(18)O的本征模分量基本一致,其中254 a和116 a兩個周期都類似于大氣Δ~(14)C表征的太陽活動周期,表明植被生產(chǎn)力和低緯水汽都受控于太陽活動。同一周期對應(yīng)的δ~(13)C振幅幾乎是δ~(18)O的2倍,說明洞穴地點(diǎn)的土壤生產(chǎn)率放大了太陽活動的初始信號。526 a周期對石筍δ~(13)C貢獻(xiàn)最大(~20%),與北大西洋深層水體550 a周期一致,可能的機(jī)制是北半球高緯氣候通過西風(fēng)帶影響了東亞大陸的環(huán)境變化。石筍δ~(13)C的趨勢分量變化平穩(wěn),明顯不同于δ~(18)O的趨勢分量,表明洞穴地點(diǎn)的土壤生產(chǎn)率并不直接響應(yīng)于軌道尺度的太陽輻射變化。
[Abstract]:By using the method of empirical mode decomposition (EMD), the multiscale decomposition of the Holocene stalagmites 未 ~ (18) O and 未 ~ (13) ~ (13) C records of Donggodong, Guizhou Province was carried out, and the eigenmode components of 8 and 9 intrinsic modes were obtained respectively.On the scale below 254 years, the intrinsic mode components of stalagmite 未 ~ (13) ~ (13) C and 未 ~ (18) O are basically the same. The periods of 254a and 116a are both similar to the solar cycle characterized by atmospheric 螖 ~ (14) C, indicating that vegetation productivity and low latitude water vapor are controlled by solar activity.The amplitude of 未 ~ (13) C corresponding to the same period is almost twice that of 未 ~ (18) O, which indicates that the initial signal of solar activity .526 a period is magnified by soil productivity in the cave site, and the maximum contribution to 未 ~ (13) ~ (13) C of stalagmites is obtained from the period of .526 a, which is consistent with the 550 a cycle of deep North Atlantic water bodies.The possible mechanism is that the high latitudes of the Northern Hemisphere influence the environmental changes of the East Asian continent through the westerly belt.The trend component of stalagmite 未 ~ (13) C is stable, which is obviously different from that of 未 ~ (18) O, indicating that the soil productivity in the cave site is not directly related to the solar radiation variation on the orbital scale.
【作者單位】: 南京師范大學(xué)地理科學(xué)學(xué)院虛擬地理環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室;江蘇省地理環(huán)境演化國家重點(diǎn)實(shí)驗(yàn)室培育建設(shè)點(diǎn);江蘇省地理信息資源開發(fā)與利用協(xié)同創(chuàng)新中心;
【基金】:國家自然科學(xué)基金項(xiàng)目(41130210,41572340) 江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項(xiàng)目(164320H116)
【分類號】:P532
,

本文編號:1749056

資料下載
論文發(fā)表

本文鏈接:http://www.wukwdryxk.cn/kejilunwen/diqiudizhi/1749056.html


Copyright(c)文論論文網(wǎng)All Rights Reserved | 網(wǎng)站地圖 |

版權(quán)申明:資料由用戶e5d09***提供,本站僅收錄摘要或目錄,作者需要刪除請E-mail郵箱bigeng88@qq.com
MM1313亚洲国产精品| 大香蕉一区| 韩日欧美| 粉嫩18p| 成年免费视频黄网站在线观看| 热久久国产| 欧洲美熟女乱又伦av| 搡老熟女国产| 日本色图在线观看| 国产精品成人在线| 国产精品成人无码久久久久久| 精品蜜臀久久久久99网站| 欧美熟妇另类久久久久久多毛| 尤物视频免费看| 日韩av免费在线观看| 亚洲av无码乱码在线观看性色扶| 亚洲超碰无码色中文字幕97| 色哟哟av| 久久午夜无码免费| 亚洲国产精品无码久久久秋霞1| 快播色图| 日韩一区二区三区无码免费视频 | 日本午夜免费福利视频| 性欧美大战久久久久久久| 国产爆乳无码视频在线观看3| 国产嘿嘿嘿视频在线观看| 久久久久亚洲AV综合仓井空| 2022国产成人精品视频人| 国产精品| 夜夜高潮天天爽欧美| 欧美高清视频手机在在线| 荔波县| 成年男女免费视频网站| 亚洲精品在线| 国产精品区av| 小辣椒福利视频导航| 亚洲图片| 97久久超碰国产精品旧版| 国内精品久久久久久| 国产无人区卡一卡二卡三乱码| 99999久久久久久亚洲|