|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | The status of carbon neutrality of the world’s top 5 CO_(2) emitters as seen by carbon satellites显示文摘China,the Unite States(US),the European Union(EU),India,and Russia are the world’s top 5 fossil fuel and cement CO_(2)(FFC)emitting countries or regions(CRs).It is very important to understand their status of carbon neutrality,and to monitor their future changes of net carbon fluxes(NCFs).In this study,we implemented a well-established global carbon assimilation system(GCAS,Version 2)to infer global surface carbon fluxes from May 2009 to December 2019 using both GOSAT and OCO-2 XCO_(2)retrievals.The reductions of flux uncertainty and XCO_(2)bias,and the evaluation of posterior flux show that GCAS has comparable and good performance in the 5 CRs.The results suggest that Russia has achieved carbon neutrality,but the other 4 are still far from being carbon neutral,especially China.The mean annual NCFs in China,the US,the EU,India,and Russia are 2.33±0.29,0.82±0.20,0.42±0.16,0.50±0.12,and-0.33±0.23 PgC yr^(−1),respectively.From 2010 to 2019,the NCFs showed an increasing trend in the US and India,a slight downward trend after 2013 in China,and were stable in the EU.The changes of land sinks in China and the US might be the main reason for their trends.India’s trend was mainly due to the increase of FFC emission.The relative contributions of NCFs to the global land net carbon emission of China and the EU have decreased,while those of the US and India have increased,implying the US and India must take more active measures to control carbon emissions or increase their sinks.This study indicates that satellite XCO_(2)could be successfully used to monitor the changes of regional NCFs,which is of great significance for major countries to achieve greenhouse gas control goals. | Fei Jian Wei He Weimin Ju Hengmao Wang Mousong Wu Jun Wang Shuzhuang Feng Lingyu Zhang Jing MChen | 2022 | Fundamental Research2022，2，3： | 1 |
| 2 | The Nord Stream pipeline gas leaks released approximately 220,000 tonnes of methane into the atmosphere显示文摘Sudden mega natural gas leaks of two Nord Stream pipelines in the Baltic Sea(Denmark)occurred from late September to early October 2022,releasing large amounts of methane into the atmosphere.We inferred the methane emissions of this event based on surface in situ observations using two inversion methods and two meteorological reanalysis datasets,supplemented with satellite-based observations.We conclude that approximately 220±30 Gg of methane was released from September 26 to October 1,2022. | Mengwei Jia Fei Li Yuzhong Zhang Mousong Wu Yingsong Li Shuzhuang Feng Hengmao Wang Huilin Chen Weimin Ju Jun Lin Jianwei Cai Yongguang Zhang Fei Jiang | 2022 | Environmental Science and Ecotechnology2022，，4： | 0 |
| 3 | Global Terrestrial Ecosystem Carbon Flux Inferred from TanSat XCO_(2)Retrievals显示文摘TanSat is China’s first greenhouse gases observing satellite.In recent years,substantial progresses have been achieved on retrieving column-averaged CO_(2)dry air mole fraction(XCO_(2)).However,relatively few attempts have been made to estimate terrestrial net ecosystem exchange(NEE)using TanSat XCO_(2)retrievals.In this study,based on the GEOS-Chem 4D-Var data assimilation system,we infer the global NEE from April 2017 to March 2018 using TanSat XCO_(2).The inversion estimates global NEE at−3.46 PgC yr^(-1),evidently higher than prior estimate and giving rise to an improved estimate of global atmospheric CO_(2)growth rate.Regionally,our inversion greatly increases the carbon uptakes in northern mid-to-high latitudes and significantly enhances the carbon releases in tropical and southern lands,especially in Africa and India peninsula.The increase of posterior sinks in northern lands is mainly attributed to the decreased carbon release during the nongrowing season,and the decrease of carbon uptakes in tropical and southern lands basically occurs throughout the year.Evaluations against independent CO_(2)observations and comparison with previous estimates indicate that although the land sinks in the northern middle latitudes and southern temperate regions are improved to a certain extent,they are obviously overestimated in northern high latitudes and underestimated in tropical lands(mainly northern Africa),respectively.These results suggest that TanSat XCO_(2)retrievals may have systematic negative biases in northern high latitudes and large positive biases over northern Africa,and further efforts are required to remove bias in these regions for better estimates of global and regional NEE. | Hengmao Wang Fei Jiang Yi Liu Dongxu Yang Mousong Wu Wei He Jun Wang Jing Wang Weimin Ju Jing MChen | 2022 | Journal of Remote Sensing2022，，1： | 0 |
| 4 | Water,Salt and Heat Influences on Carbon and Nitrogen Dynamics in Seasonally Frozen Soils in Hetao Irrigation District,Inner Mongolia,China显示文摘To investigate carbon(C)and nitrogen(N)dynamics in seasonally frozen soils under saline and shallow groundwater supply conditions,in-situ lysimeter experiments with different groundwater table depths(WTD=1.8 and 2.2 m)were conducted in Inner Mongolia,China during the wintertime of 2012-2013.Changes in soil organic C and total N in multiple layers during various periods,as well as their relationships with soil water,salt,and heat dynamics were analyzed.Accumulation of soil organic C and total N during freezing periods was strongly related to water and salt accumulation under temperature and water potential gradients.Water and salt showed direct influences on soil C and N dynamics by transporting them to upper layer and changing soil microbial activity.Salt accumulation in the upper layer during freezing and thawing of soil affected microbial activity by lowering osmotic potential,resulting in lower C/N ratio.Nitrogen in soil tended to be more mobile with water during freezing and thawing than organic C,and the groundwater table also served as a water source for consecutive upward transport of dissolved N and C.The changes in C and N in the upper 10 cm soil layer served as a good sign for identification of water and salt influences on soil microbial activity during freezing/thawing. | WU Mousong HUANG Jiesheng TAN Xiao WU Jingwei | 2019 | Pedosphere2019，29，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员