Articles | Volume 16, issue 6
Atmos. Chem. Phys., 16, 3953–3967, 2016
Atmos. Chem. Phys., 16, 3953–3967, 2016

Research article 24 Mar 2016

Research article | 24 Mar 2016

Influence of Meteorology and interrelationship with greenhouse gases (CO2 and CH4) at a suburban site of India

Gaddamidi Sreenivas, Pathakoti Mahesh, Jose Subin, Asuri Lakshmi Kanchana, Pamaraju Venkata Narasimha Rao, and Vinay Kumar Dadhwal Gaddamidi Sreenivas et al.
  • Atmospheric and Climate Sciences Group (ACSG), Earth and Climate Science Area (ECSA), National Remote Sensing Center (NRSC), Indian Space Research Organization (ISRO), Hyderabad, 500037, India

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.

Short summary
This study provides systematic and scientific representation of greenhouse gases (CO2 and CH4) and its dynamics at a suburban site of India. It was required to generate reliable, highly precise, and accurate measurements of CO2 and CH4 over this part of the world. We made use of high-precision greenhouse gases measurements recorded by LGR-GGA instrument also by complementary data from remote sensing satellites as well as from automatic weather station.
Final-revised paper