Reconstruction of glacial-interglacial variations of greenhouse gases from a Greenland deep ice core, NGRIP

从格陵兰深冰芯重建冰期-间冰期温室气体变化，NGRIP

基本信息

批准号：
13304035
负责人：
NAKAZAWA Takakiyo
金额：
$ 31.2万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13304035/
关键词：
Ice core Greenland North GRIP Greenhouse gas Isotope Glacial period Interglacial period Global cycle

项目摘要

In order to reconstruct variations of atmospheric CH_4, N_2O, CO_2 and O_2 concentrations, δ^<15>N of N_2, δ^<18>O of O_2, and air content for the last 130 Kyrs, we analyzed the North-GRIP deep ice core from Greenland using a wet air extraction technique. We also determined ice age and age differences between ice and occluded air based on the results of δ^<18>O of ice and an accumulation model. After correcting for a gravitational effect occurred due to molecular diffusion in firn, detailed temporal variations of all the abovementioned factors were deduced. Furthermore, we also discussed the similarity and differences between variation histories of all factors in north and south polar regions, by comparing the results obtained from the North-GRIP core and the Dome Fuji deep ice core, Antarctica. Especially interesting results derived in this study are that 1.the CH4 concentration was always higher in the north polar region in the south polar region, and those concentration differences … More depended on temperature, except for Holocene, 2.the CO_2 concentrations from the North-Grip core were apparently higher than those from the Dome Fuji core, suggestion that CO2 was newly produced by reacting with impurities during storage of air in ice in Greenland, 3.the N_2O concentrations from the North-Grip and Dome Fuji ice cores were fairly stable for Holocene, but quite variable in the glacial period, 4.the O2 concentrations from the North-Grip and Dome Fuji ice cores were extremely low, suggesting that the process of air occlusion into ice at the bottom of firn is very complex, and 5.that temporal variations of air content from both cores were similar to each other, but such variations are in conflict with our present knowledge, which may be related to incident solar radiation. By analyzing the temporal variations of CH4 concentration differences obtained from the North-Grip and Dome Fuji ice cores using a 3-box model consisting of northern and southern high latitudes and low latitude, we also succeeded in elucidating where was responsible for the north-south concentration differences over the glacial interglacial period. Less

为了重建大气CH_4，N_2O，CO_2和O_2浓度的变化，O_2的N_2，δ^<18> O的δ^<15> n，以及最后130台kyrs的空气含量，我们使用湿空气提取技术分析了Greenland的North-Grip Deep Ice Core。我们还根据冰的结果和累积模型确定了冰的年龄和冰与遮挡空气之间的年龄差异。校正引力效应是由于FIRN的分子差异而发生的，因此推导了所有上述因子的详细临时变化。此外，我们还通过比较了从North-Grip Core和dome Fuji Deep Ice Core，Antarctica进行比较，我们还讨论了北极区域和南极区域所有因素的变化历史之间的相似性和差异。在这项研究中得出的特别有趣的结果是1.南极地区的北极地区CH4浓度总是更高，而这些浓度差异……更依赖温度，除了全新世以外，北方核心的CO_2浓度显然更高，显然高于fuji Core的CO_2浓度，表明CO2与北部的浓度相比，与Impurips Ince Ince Ince Ince Ince Ince Ince Ince Ince Ince Ince Ince Ince n n n in n n n in n n n n in n n n in n n n in n n n n in Ice n n in Ice in n.和富士圆顶冰芯对于全新世来说相当稳定，但在冰川期间相当可变化。4。北方和富吉冰芯的o2浓度极低，非常低，这表明在FIR的底部进入冰的空气闭塞过程非常复杂，并且在两种情况下都可能发生了类似的空气含量，但这种变化与其他相似的态度相似，但这种变化是相似的，但这种变化是类似的，但这种变化是相似的，它的变化是相似的。太阳辐射。通过使用由北龙和富吉冰芯组成的3盒模型分析从北麦和圆顶富士冰芯获得的CH4浓度差异的临时变化，该模型使用北龙和富吉冰芯组成的3盒模型，该模型使用North-Grip和由North-Grip和Southern High Latitudes和Southern High Latitudes and Low Latitude和低纬度组成的3盒模型，我们还取得了较低的浓度，从而超过了北方人的互相互动。较少的