搜索结果: 1-15 共查到“大气科学 CH4”相关记录21条 . 查询时间(0.031 秒)
中国科学院大气物理研究所专利：同步测量N2O、CH4和CO2通量的涡动相关法装置
全球目前一半以上的人口居住在城市区域，并且，随着城市化进程的进一步加快，更多的自然和农业生态系统被转化为城市生态系统。城市绿地，作为城市生态系统中用于改善生态环境质量的重要组成部分，其对大气二氧化碳（CO2）的吸收和固定作用已经得到许多研究的证实。然而，关于城市化引起的土地利用变化（即自然和农业生态系统转变为城市绿地）对土壤非CO2温室气体（甲烷（CH4）和氧化亚氮（N2O））排放的定量影响仍然知...
全球目前一半以上的人口居住在城市区域，并且，随着城市化进程的进一步加快，更多的自然和农业生态系统被转化为城市生态系统。城市绿地，作为城市生态系统中用于改善生态环境质量的重要组成部分，其对大气二氧化碳（CO2）的吸收和固定作用已经得到许多研究的证实。然而，关于城市化引起的土地利用变化（即自然和农业生态系统转变为城市绿地）对土壤非CO2温室气体（甲烷（CH4）和氧化亚氮（N2O））排放的定量影响仍然知...
青藏高原对地球气候系统有着重要影响。2021年8月，中国科学院大气物理研究所周敏强副研究员、蔡兆男副研究员及合作者利用Bruker EM27/SUN傅里叶红外光谱仪（FTIR）在格尔木气象局（36.42oE，94.91oN，2808 m）开展了地基遥感观测实验，分析了CO2、CH4和CO柱浓度变化，并对TROPOMI/S5P卫星进行了误差验证研究。该工作近期发表在Advances in Atmos...
氧化亚氮（N2O）、甲烷（CH4）和二氧化碳（CO2）是大气中最重要的三种温室气体。基于湍流理论的涡动相关法是测量地气间温室气体交换通量的理想方法，该方法对生态系统干扰小，并可获得长时间序列的观测数据。然而，目前现有的基于涡动相关法的观测设备只能有效测量上述三种气体中的一种或至多两种气体的通量。王凯、王东（博士生）和郑循华所在的碳氮循环团队采用一台闭路量子级联激光（QCL）气体分析仪和相关设备配件...
Inverse modeling of European CH4 emissions: sensitivity to the observational network
European CH4 emissions observational network
2010/2/21
Inverse modeling is widely employed to provide "top-down" emission estimates using atmospheric measurements. Here, we analyze the dependence of derived CH4 emissions on the sampling frequency and dens...
Uncertainties in modelling CH4 emissions from northern wetlands in glacial climates：effect of hydrological model and CH4 model structure
northern wetlands glacial climates hydrological model CH4 model structure
2009/12/3
Methane (CH4) fluxes from northern wetlands may have influenced atmospheric CH4 concentrations at climate warming phases during the last 800 000 years and during the present global warming. Including ...
中国4个国家级野外站大气CH4本底浓度变化特征
大气CH4 瓶采样 本底浓度 区域差异
2009/10/20
CH4是仅次于CO2的重要温室气体。2006年9月至2008年8月期间，按全球大气本底观测要求，在青海瓦里关、北京上甸子、浙江临安和黑龙江龙凤山4个国家级野外站开展每周一次空气样品flask瓶采样分析，获得了该地区为期2 a的大气CH4本底浓度资料。结果表明，2 a间瓦里关、上甸子、临安和龙凤山4站CH4浓度年均增幅分别为9.1×10-9、3.8×10-9、21.8×10-9和8.2×10-9；...
Multi-species inversion of CH4, CO and H2 emissions from surface measurements
Multi-species CH4 CO H2 emissions surface measurements
2009/8/7
In order to study the spatial and temporal variations of the emissions of greenhouse gases and of their precursors, we developed a data assimilation system and applied it to infer emissions of CH4, CO...
Comparison of CMAM simulations of carbon monoxide（CO）, nitrous oxide（N2）, and methane（CH4）with observations from Odin/SMR, ACE-FTS, and Aura/MLS
CMAM simulations carbon monoxide nitrous oxide CH4 ACE-FTS Aura/MLS
2009/6/2
Simulations of CO, N2O and CH4 from a coupled chemistry-climate model (CMAM) are compared with satellite measurements from Odin Sub-Millimeter Radiometer (Odin/SMR), Atmospheric Chemistry Experiment F...
Effect of water addition and nitrogen fertilization on the fluxes of CH4, CO2, NOx, and N2O following five years of elevated CO2 in the Colorado Shortgrass Steppe
nitrogen fertilization CH4 CO2 NOx N2O Colorado Shortgrass Steppe
2009/3/11
An open-top-chamber (OTC) CO2 enrichment (~720 mmol mol-1) study was conducted in the Colorado shortgrass steppe from April 1997 through October 2001. Aboveground plant biomass increased under elevate...
Technical note: A stratospheric climatology for O3, H2O, CH4, NOx, HCl and HF derived from HALOE measurements
stratospheric climatology O3 HF HALOE measurements
2009/2/18
The Halogen Occultation Experiment (HALOE) on board the Upper Atmosphere Research Satellite (UARS) has observed mixing ratios of important trace species in the stratosphere for more than a decade sinc...
Inverse modelling of national and European CH4 emissions using the atmospheric zoom model TM5
national and European CH4 emissions atmospheric zoom model TM5
2009/2/17
A synthesis inversion based on the atmospheric zoom model TM5 is used to derive top-down estimates of CH4 emissions from individual European countries for the year 2001. We employ a model zoom over Eu...
The impact of SCIAMACHY near-infrared instrument calibration on CH4 and CO total columns
SCIAMACHY near-infrared instrument calibration CH4 CO total columns
2009/2/17
The near-infrared spectra measured with the SCIAMACHY instrument on board the ENVISAT satellite suffer from several instrument calibration problems. The effects of three important instrument calibrati...
Shipborne solar absorption measurements of CO2, CH4, N2O and CO and comparison with SCIAMACHY WFM-DOAS retrievals
Shipborne solar absorption measurements CO2 CH4 N2O CO SCIAMACHY WFM-DOAS retrievals
2009/2/13
CO, CH4, N2O and CO2 were retrieved from high resolution solar absorption spectra obtained during a ship cruise from Capetown to Bremerhaven in January/February 2003 by Fourier Transform Infrared (FTI...