Measuring the Value of Blue Carbon in China Coastal Zone

自工业化以来，大气二氧化碳及其他温室气体的浓度已增加了40%，不断增 加的温室气体排放是全球气候变化的重要原因，从而对全球粮食生产以及人类的 生活和生计造成严重影响，气候变化是人类21世纪面临的重大挑战之一。研究 显示全球自然系统封存的生物碳中，超过一半是由海洋生态系统所捕获，被海洋 生态系统捕获并封存的碳称为蓝碳。维持和促进海洋生态系统封存二氧化碳的能 力是应对气候变化的关键措施之一，但是海洋生态系统在应对气候变化中的作用 被长期忽略，其中重要的原因之一是没有赋予蓝碳适宜的价值。本文在对蓝碳理 论系统梳理的基础上，借鉴国内外滨海植物生境、河口、浮游植物、养殖贝类的 碳封存能力...IPCC has pointed that the concentration of atmospheric carbon dioxide has increased by 40 percent since industrialization. Increasing emissions of greenhouse gas are an important cause of global climate change and have a serious impact on global food production and and livelihoods.Climate change is one of the major challenges of the 21st century. The study shows that blue carbon which is captured ...学位：理学硕士院系专业：环境与生态学院_环境管理学号：3332013115175

石笋氧同位素和微量元素记录的陕南地区4200~2000a B. P.高分辨率季风降雨变化

基于陕南祥龙洞石笋XL2的19个~(230)Th年龄、218个氧同位素分析以及896个Sr/Ca分析数据,高分辨率重建了4200~1972a B. P.期间陕南地区季风降雨变化。重建结果显示陕南地区这一时期季风降雨有显著的127~ 105a和57a周期,可能分别受控于太阳活动、PDO和/或AMO的变化。重建时段有3次百年尺度的干旱事件,分别发生于2200~2100a B. P.,2900~2700a B. P.和3600~3400a B. P.,其中2900~2700a B. P.干旱事件对应于北大西洋地区2. 8ka冷事件。对比研究显示,尽管祥龙洞石笋和董哥洞石笋&delta;~(18)O记录整体一致,但除了2900~ 2700 a B.P.干旱事件之外,其他两次干旱事件在董哥洞石笋记录中并不明显。而尽管总体上祥龙洞和和尚洞石笋&delta;~(18)0记录的差异要大,但XL2的3次干旱事件在和尚洞记录都有明显体现。有精确年代控制的祥龙洞、董哥洞及和尚洞石笋氧同位素记录的差异,揭示晚全新世我国季风降雨在十-百年尺度存在区域差异。</p

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies