Spatial variations of atmospheric methane concentrations in China

Methane (CH4) is regarded as one of the most important greenhouse gases due to its radiative forcing. Therefore, in running climate models, it is important to have accurate estimates of CH4 concentrations at an appropriate scale. Although great efforts have recently been undertaken to quantify atmospheric CH4 concentrations based on extensive ground-based measurements, it is still difficult to obtain the spatial variations of the CH4 volume mixing ratio (VMR) on a regional scale. This study analyses the spatial variations of CH4 VMRs in China, based on the retrieved CH4 data from Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) spectra. The results showed that the spatial distribution of CH4 VMRs presented decreasing gradients from south-east to north-east and the lowest CH4 concentrations were located on the Qinghai-Tibet Plateau. Paddy fields were the main sources of CH4 in China, as shown through spatial analysis. Natural wetlands and population also contributed to CH4 VMRs. Plant, climate and soil properties presented a strong positive influence on CH4 concentrations, which could be used to interpret the spatial variations. Stepwise multiple regression modelling results showed that temperature, normalized difference vegetation index (NDVI) and soil total nitrogen could explain 76.9% of the differences in CH4 throughout China, and the average difference between the retrieved and the modelled methane concentrations was 14 ppb.

[1]  D. Sibeck,et al.  A case study of transient event motion in the magnetosphere and in the ionosphere , 1995 .

[2]  Tim R. Moore,et al.  Methane flux: Water table relations in northern wetlands , 1993 .

[3]  J. F. Meirink,et al.  Inverse Modeling of Global and Regional CH4 Emissions Using SCIAMACHY Satellite Retrievals , 2009 .

[4]  H. L. Miller,et al.  Climate Change 2007: The Physical Science Basis , 2007 .

[5]  F. Keppler,et al.  Methane emissions from terrestrial plants under aerobic conditions , 2006, Nature.

[6]  P. C. Alvalá,et al.  Methane emissions from lakes and floodplains in Pantanal, Brazil , 2007 .

[7]  K. Bronson,et al.  Methane production capacities of different rice soils derived from inherent and exogenous substrates , 1998, Plant and Soil.

[8]  K. Inubushi,et al.  Seasonal changes of CO(2), CH(4) and N(2)O fluxes in relation to land-use change in tropical peatlands located in coastal area of South Kalimantan. , 2003, Chemosphere.

[9]  S. A. Clough,et al.  Operational trace gas retrieval algorithm for the Infrared Atmospheric Sounding Interferometer , 2004 .

[10]  Z. Cai,et al.  Methane Emission from Natural Wetlands in China:Summary of Years 1995-2004 Studies , 2007 .

[11]  Katharine Hayhoe,et al.  Atmospheric methane and global change , 2002 .

[12]  J. F. Meirink,et al.  Assessing Methane Emissions from Global Space-Borne Observations , 2005, Science.

[13]  Madalynne Schoenfeld.  Seasonal changes , 1983 .

[14]  W. Reeburgh,et al.  Interannual variations in tundra methane emission: A 4-year time series at fixed sites , 1992 .

[15]  R. Sass,et al.  Methane emissions from rice fields: Effect of soil properties , 1994 .

[16]  T. Callaghan,et al.  Spatial variation in high‐latitude methane flux along a transect across Siberian and European tundra environments , 1995 .

[17]  Peter Bergamaschi,et al.  First ground-based FTIR observations of methane in the inner tropics over several years , 2010 .

[18]  S. Solomon.  The Physical Science Basis : Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[19]  J. Chanton,et al.  Methane emission from rice: Stable isotopes, diurnal variations, and CO2 exchange , 1997 .

[20]  H. Haraguchi,et al.  Spatial and temporal characteristics of urban atmospheric methane in Nagoya City, Japan:: an assessment of the contribution from regional landfills , 2001 .

[21]  O. Schneising,et al.  First ground-based FTIR-observations of methane in the tropics , 2010 .

[22]  Peter Bergamaschi,et al.  Three years of greenhouse gas column-averaged dry air mole fractions retrieved from satellite - Part 2: Methane , 2008 .

[23]  R. C. Dalal,et al.  Magnitude and biophysical regulators of methane emission and consumption in the Australian agricultural, forest, and submerged landscapes: a review , 2008, Plant and Soil.

[24]  M. L. Beusichem,et al.  Methane emissions from wet grasslands on peat soil in a nature preserve , 1999 .

[25]  H. Rennenberg,et al.  Methane emission patterns from rice fields planted to several rice cultivars for nine seasons , 2002, Nutrient Cycling in Agroecosystems.

[26]  C. Clerbaux,et al.  Trace gas measurements from infrared satellite for chemistry and climate applications , 2003 .

[27]  Naohiro Yoshida,et al.  Source evaluation of atmospheric methane over western Siberia using double stable isotopic signatures , 2005 .

[28]  W. Winiwarter,et al.  Methane release from wetlands and watercourses in Europe , 2009 .

[29]  Peter Bergamaschi,et al.  Tropical methane emissions: A revised view from SCIAMACHY onboard ENVISAT , 2008 .

[30]  Robin Matthews,et al.  Modelling the impacts of climate change and methane emission reductions on rice production: a review , 2003 .

[31]  Maximilian Reuter,et al.  GREENHOUSE GASES FROM SCIAMACHY / ENVISAT NADIR OBSERVATIONS : CO 2 AND CH 4 DURING 2003-2005 , 2008 .

[32]  Sven G Sommer,et al.  Ammonia, methane, and nitrous oxide emission from pig slurry applied to a pasture in New Zealand. , 2002, Journal of environmental quality.

[33]  Huang Guo.  CH_4 emissions from the reed wetland , 2001 .

[34]  Peter Bergamaschi,et al.  Satellite chartography of atmospheric methane from SCIAMACHY on board ENVISAT: Analysis of the years 2003 and 2004 , 2006 .

[35]  Joan C. Woodward,et al.  Consumption of atmospheric methane by desert soils , 1992, Nature.

[36]  J. B. Miller,et al.  Contribution of anthropogenic and natural sources to atmospheric methane variability , 2006, Nature.

[37]  G. W. Thurtell,et al.  A micrometeorological mass balance approach for greenhouse gas flux measurements from stored animal manure , 2004 .

[38]  Jeroen A. H. W. Peters,et al.  Recent trends in global greenhouse gas emissions:regional trends 1970–2000 and spatial distributionof key sources in 2000 , 2005 .

[39]  R. Sass,et al.  Methane emission from rice fields as influenced by solar radiation, temperature, and straw incorporation , 1991 .

[40]  H. Neue,et al.  Effect of soil characteristics on sequential reduction and methane production in sixteen rice paddy soils from China, the Philippines, and Italy , 1999 .

[41]  S. T. Lewis.  The use of redox measurements to study methane mitigation options in Texas rice paddies , 1996 .

[42]  Z. Cai,et al.  Key factors affecting spatial variation of methane emissions from freshwater marshes. , 2003, Chemosphere.

[43]  W. Reeburgh,et al.  Methane consumption and emission by Taiga , 1991 .