Understanding atmospheric methane sub-seasonal variability over India
Atmospheric methane is considered to be one of the most important greenhouse gases due to its increasing atmospheric concentrations and the fact that it has a warming potential 28 times that of atmospheric carbon dioxide. Over the Indian sub-continent, fluxes and transport both contribute towards atmospheric methane's seasonal variability. Its intra-seasonal variability however is more complex as it is additionally influenced by monsoonal activity during the Asian Summer Monsoon (ASM) period. In this study, Yogesh K. Tiwari and colleagues examine the intra-seasonal variability of atmospheric methane using ground-based observations at two sites located in the Southern Indian Peninsula, Sinhagad (SNG) and Cape Rama (CRI); and outputs from three different model simulations.
Both, the ground based observations and multi-model simulations show that the dominant spectral variability of methane is coherent with 20–90 day oscillations in the dynamics of the monsoon (termed hereafter as Intra-Seasonal Oscillations, ISOs). The multi-model analysis revealed that methane is heavily influenced by advection due to this intra-seasonal variability. The simulations also display a clear northward propagation of methane anomalies over India. The co-evolution of methane, outgoing long wave radiation (to represent convection) and OH radicals (proxy to methane sinks) is presented. The study quantifies atmospheric methane variability at intra-seasonal timescales and also its spatial extent. The results suggest that the effect of ISOs on atmospheric methane needs to be considered along with the corresponding observations for future inverse modeling.
Powered by Blogger.
Platform anthropocene Inc. or planthro is a New York
registered, globally active, not-for-profit public charity organization.
planthro targets scientists, students, citizens, governing
bodies, entrepreneurs and stakeholders concerned with the
concept of anthropocene and its multiple implications.
The organization aims at:
● conveying and sharing a lucid view of the complexity
characterizing human interaction with Earth,
● empowering individuals and organisations to work
collaboratively in economic, social, environmental, and
governance contexts,
● supporting and promoting informed and creative solutions
on sustainability, mitigation and adaptive strategies.
Find out more...
What do you think?
Have a comment, need more information, found an error, copyright claims, found a broken link, want to get involved, want to suggest a reference...
Write a comment on this page on this reference or get in touch with the project through the contact form on the corporate page www.planthro.org
No comments:
Post a Comment