石油および環境バイオテクノロジージャーナル

概要

CO2 over a Coastal Urban Location and its Forcing

Sandhya K Nair*, Madhusoodanan MS

Recognizing the role of Carbon dioxide (CO₂) in altering climate research and air pollution, direct measurements carried out over a coastal urban station using Li-COR CO₂/H₂O analyser. The objective of the present study is to examine CO₂ variability during December-March. Day-to-day variability of CO₂ ranges from 380-550 ppm with a mean (423.1) and standard deviation (29.2). Monthly mean diurnal variability of CO₂ is maximum during midnight to early morning hours and minimum during afternoon. Overall diurnal variation is similar during the entire months. The link between CO₂ concentrations with Wind Speed (WS), Atmospheric Temperature (T) is examined. Wind speed varies inversely with CO₂. Atmospheric temperature shows an exponentially decaying relation with CO₂. The diurnal CO₂ variability is associated with the competing source/sink mechanisms. The CO₂ forcing is estimated and varies from 0.75 to 3.5 Wm-2 with temperature change from 1.75 to 2.0˚C.