搜索结果: 1-15 共查到“大气物理学 CO2”相关记录41条 . 查询时间(0.125 秒)
大气二氧化碳（CO2）在千年尺度寒冷时期（又称冰阶期）的变化并不是单一的，而是呈现增加、保持不变，甚至降低等多个变化趋势。大量研究认为，大气CO2变化主要受控于南大洋通风（即大气和海洋内部之间气体成分的交换）对深海存储碳量的调节。一个广为接受的观点认为，南半球西风增强或向极地的摆动可以提升南大洋对深海的通风状况，促进深海碳向大气的释放，从而导致冰阶期大气CO2的增加。然而，南大洋通风的变化无法解释...
中国科学院地球环境研究所在核爆14C示踪南海海气CO2通量方面取得进展（图）
碳循环 大气核试验 卫星遥感
2023/8/13
海洋是地表系统最大的碳库，约是大气碳库的50倍和陆地碳库的20倍。海气CO2通量是认识海洋在全球碳循环中作用的关键。上个世纪50-60年代大气核试验排放大量的14C到大气中，产生大气Δ14C高于海水表层Δ14C的梯度差。两者的梯度差使得核爆14C进而渗入到海洋；这些渗入的核爆14C可以用来示踪海气CO2通量。
北京市和厦门市大气 CO2 浓度及 δ13C 值变化特征
大气 CO2 浓度 δ13C 季节变化 昼夜变化 Keeling 曲线
2019/1/16
本文对北京市和厦门市大气CO2及 δ13C进行观测，研究内陆城市和沿海城市CO2浓度及 δ13C的季节和昼夜变化规律及影响因素，以期为政府制定碳减排政策提供科学依据。北京市和厦门市CO2浓度均呈现秋冬季高于春夏季，而 δ13C秋冬季低于春夏季，季节差异原因可能是秋冬大气边界层降低，化石燃料消耗增加，贫13C的CO2气体大量排放。观测期间，两个城市日变化模式均表现为CO2夜间高于白天， δ13C夜间...
WRFv3.2-SPAv2: development and validation of a coupled ecosystem–atmosphere model, scaling from surface fluxes of CO2 and energy to atmospheric profiles
development ecosystem–atmosphere model
2014/12/12
The Weather Research and Forecasting meteorological (WRF) model has been coupled to the
Soil–Plant–Atmosphere (SPA) terrestrial ecosystem model to produce WRF-SPA.
白垩纪温室气候古大气CO2变化趋势研究取得新进展（图）
白垩纪 古大气CO2变化趋势
2014/1/23
白垩纪是地质时期的典型温室气候时期并发生了若干重大生物和地质事件。CO2是显生宙气候变化的主要驱动力，白垩纪古大气CO2浓度变化的探究是国际地学领域关注的热点和前沿科学问题之一。
中国全球二氧化碳监测科学实验卫星(TanSat)预计将于2015年发射升空. 针对TanSat的高精度遥感观测科学目标, 基于最优估计理论建立能够监测全球碳源汇变化的大气二氧化碳混合比(XCO2)的高精度反演方法. 利用碳源汇监测卫星(GOSAT)观测光谱数据开展了反演试验, XCO2反演值与中纬度地面观测结果(TCCON)的对比分析表明: 90%的反演误差小于4 ppm (1%)(1 ppm =...
利用现有大气本底站的大气CO2浓度观测信息,综合考虑不同经济区划与土地覆盖类型对应的CO2浓度差异及其季节变化规律,构建模式区域内以月为单位的网格化大气CO2浓度非均匀动态分布数据模型.由此数据模型驱动RegCM4-CLM3.5区域气候模式运行,对东亚区2000年3月—2009年2月之间的气候变化特征进行了模拟,进而对大气CO2浓度非均匀动态分布可能引起的区域气候效应进行了初步研究.结果表明:目前...
不同CO2浓度背景下格陵兰-苏格兰海脊溢流水变化机制
格陵兰-苏格兰海脊溢流水 CO2 全球变暖 动力机制 数值模型
2013/8/28
关于格陵兰-苏格兰海脊溢流水的动力机制, 历来有“斜压密度流”和“正压效应”两种不同的观点, 在全球变暖的背景下, 作为热盐环流(THC)重要组成部分的格陵兰-苏格兰海脊溢流水变化的动力机制是非常值得探讨的科学问题. 基于德国Max-Planck 气象研究所的大气海洋环流模式ECHAM5/MPI-OM, 耦合海冰和陆面过程模式, 分别设计了CO2 浓度固定在1860 年工业化以前的水平——280 ...
A very high-resolution (1 km×1 km) global fossil fuel CO2 emission inventory derived using a point source database and satellite observations of nighttime lights
a point source database satellite observations nighttime lights
2011/1/20
Emissions of CO2 from fossil fuel combustion are a critical quantity that must be accurately given in established flux inversion frameworks. Work with emerging satellite-based inversions requires spat...
CO2 and its correlation with CO at a rural site near Beijing: implications for combustion efficiency in China
CO2 CO a rural site near Beijing combustion efficiency China
2010/10/11
Although China has surpassed the United States as the world's largest carbon dioxide emitter, in situ measurements of atmospheric CO2 have been sparse in China. This paper analyzes hourly CO2 and its ...
What can be learned about carbon cycle climate feedbacks from the CO2 airborne fraction?
carbon cycle climate the CO2 airborne fraction
2010/8/25
The ratio of CO2 accumulating in the atmosphere to the CO2 flux into the atmosphere due to human activity, the airborne fraction AF, is central to predict changes in earth's surface temperature due to...
CO2 column-averaged volume mixing ratio derived over Tsukuba from measurements by commercial airlines
CO2 column-averaged volume mixing ratio Tsukuba commercial airlines
2010/8/25
Column-averaged volume mixing ratios of carbon dioxide (XCO2) during the period from January 2007 to May 2008 over Tsukuba, Japan, were derived using CO2 concentrations measured by Continuous CO2 Meas...
Characterization of Tropospheric Emission Spectrometer (TES) CO2 for carbon cycle science
Tropospheric Emission Spectrometer CO2 carbon cycle science
2010/8/13
We present carbon dioxide (CO2) estimates from the Tropospheric Emission Spectrometer (TES) on the EOS-Aura satellite launched in 2004. For observations between 40° S and 45° N, we find about 1 degree...
Uncertainties in wind speed dependent CO2 transfer velocities due to airflow distortion at anemometer sites on ships
wind speed dependent CO2 velocities airflow distortion anemometer sites ships
2010/8/13
Data from platforms, research vessels and merchant ships are used to estimate ocean CO2 uptake via parameterisations of the gas transfer velocity (k) and measurements of the difference between the par...
Source-receptor relationships for airborne measurements of CO2, CO and O3 above Siberia: a cluster-based approach
Source-receptor relationships airborne measurements Siberia
2010/2/21
We analysed results of three intensive aircraft campaigns above Siberia (April and September 2006, August 2007) with a total of ~70 h of continuous CO2, CO and O3 measurements. The flight route consis...