Long-lived atmospheric trace gases measurements in flask samples from three stations in India
With the rapid growth in population and economic development, emissions of greenhouse gases (GHGs) from the Indian subcontinent have sharply increased during recent decades. However, evaluation of regional fluxes of GHGs and characterization of their spatial and temporal variations by atmospheric in...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-09-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/15/9819/2015/acp-15-9819-2015.pdf |
| Summary: | With the rapid growth in population and economic development, emissions of
greenhouse gases (GHGs) from the Indian subcontinent have sharply increased
during recent decades. However, evaluation of regional fluxes of GHGs and
characterization of their spatial and temporal variations by atmospheric
inversions remain uncertain due to a sparse regional atmospheric observation
network. As a result of an Indo-French collaboration, three new atmospheric
stations were established in India at Hanle (HLE), Pondicherry (PON) and
Port Blair (PBL), with the objective of monitoring the atmospheric
concentrations of GHGs and other trace gases. Here we present the results of
the measurements of CO<sub>2</sub>, CH<sub>4</sub>, N<sub>2</sub>O, SF<sub>6</sub>, CO, and H<sub>2</sub>
from regular flask sampling at these three stations over the period
2007–2011. For each species, annual means, seasonal cycles and gradients
between stations were calculated and related to variations in natural
GHG fluxes, anthropogenic emissions, and monsoon circulations.
Covariances between species at the synoptic scale were analyzed to
investigate the likely source(s) of emissions. The flask measurements of
various trace gases at the three stations have the potential to constrain the
inversions of fluxes over southern and northeastern India. However, this
network of ground stations needs further extension to other parts of India
to better constrain the GHG budgets at regional and continental scales. |
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| ISSN: | 1680-7316 1680-7324 |