Abstract
Abstract. Atmospheric greenhouse gases (GHGs), such as carbon dioxide (CO2) and methane (CH4), are important climate forcing agents due to their significant impacts on the climate system. The present study brings out first continuous measurements of atmospheric GHGs using high-precision LGR-GGA over Shadnagar, a suburban site of Central India during the year 2014. The annual mean CO2 and CH4 over the study region are found to be 394 ± 2.92 and 1.92 ± 0.07 ppm (μ ± 1σ) respectively. CO2 and CH4 show a significant seasonal variation during the study period with maximum (minimum) CO2 observed during pre-monsoon (monsoon), while CH4 recorded the maximum during post-monsoon and minimum during monsoon. Irrespective of the seasons, consistent diurnal variations of these gases are observed. Influences of prevailing meteorology (air temperature, wind speed, wind direction, and relative humidity) on GHGs have also been investigated. CO2 and CH4 show a strong positive correlation during winter, pre-monsoon, monsoon, and post-monsoon with correlation coefficients (Rs) equal to 0.80, 0.80, 0.61, and 0.72 respectively, indicating a common anthropogenic source for these gases. Analysis of this study reveals the major sources for CO2 are soil respiration and anthropogenic emissions while vegetation acts as a main sink, whereas the major source and sink for CH4 are vegetation and presence of hydroxyl (OH) radicals.
Highlights
The Intergovernmental Panel on Climate Change (Stocker et al, 2013) reported that humankind is causing global warming through the emission of greenhouse gases (GHGs), carbon dioxide (CO2) and methane (CH4)
The present study brings out first continuous measurements of atmospheric GHGs using high-precision LGRGGA over Shadnagar, a suburban site of Central India during the year 2014
Simultaneous observations of meteorological parameters are obtained from an automatic weather station (AWS) installed in National Remote Sensing Center (NRSC), Shadnagar campus as a part of Calibration and Validation (CAL/VAL) project in March 2012 is equipped with nine sensors to measure 15 weather parameters
Summary
The Intergovernmental Panel on Climate Change (Stocker et al, 2013) reported that humankind is causing global warming through the emission of greenhouse gases (GHGs), carbon dioxide (CO2) and methane (CH4). Many sources and sinks have been identified for CH4, their relative contribution to atmospheric CH4 is still uncertain (Garg et al, 2001; Kirschke et al, 2013). The variability of environmental factors may result in significant effects on regional climate and global climate (Wang et al, 2010), especially the radiative forcing, via the biogeochemical pathways affecting the terrestrial carbon cycle. The present study brings out first continuous measurements of atmospheric GHGs using high-precision LGRGGA over Shadnagar, a suburban site of Central India during the year 2014. Details about study area and data sets are described
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