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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
High-resolution GEOS-Chem model for Indian monsoon region: Seasonal cycle and budget of tropospheric CO2
https://orcid.org/0000-0002-9288-8048
Abstract A nested GEOS-Chem atmosphere transport model has been set up for the Indian monsoon region (40° E-110° E & 15° S–45° N at 0.250X0.3125°) spatial resolution to study the variability of the tropospheric CO2 over India and surrounding oceans during 2012–2020. The model has been constrained by the influxes of CO2 at its four lateral boundaries derived from the GEOS-Chem global simulations and surface fluxes of CO2 over the land and oceans based on historical databases. It is initialized from a known state and driven by the GEOS reanalysis's meteorological forcing. Model simulations were evaluated at three in situ measurement locations and with respect to the satellite retrievals from OCO-2 and GOSAT. Model parameters were tuned to have reasonable solutions to resolve observed latitudinal gradient and seasonal and inter-annual variability. Three additional model runs were made to evaluate the role of long-range transport, net terrestrial ecosystem exchange, air-sea fluxes, and regional emissions in controlling seasonal oscillations of tropospheric CO2 over the study region. It revealed that the net terrestrial ecosystem exchanges are responsible for 35% control in the surface layer CO2 seasonal tendency for India and the Bay of Bengal domains, and 10% for the Arabian Sea. The air-sea fluxes have 8% control on the CO2 seasonal tendency for the Arabian Sea and Bay of Bengal and 5% for India. The anthropogenic emissions have 4% control for India and <1% for the Arabian Sea, and 9% for the Bay of Bengal. The long-range transport, as the residual, is responsible for 60% variability in the seasonal cycle of CO2 over India and the Bay of Bengal and 75% for the Arabian Sea domain.
Graphical abstract Display Omitted
Highlights High-resolution limited area GEOS-Chem 3D transport model for India. Decoupled experiments to study the role of terrestrial, oceanic fluxes & local emission. Tropospheric CO2 seasonal budget for India, Arabian Sea, and Bay of Bengal. Horizontal advection dominates the terrestrial & oceanic fluxes in the net tendency.
High-resolution GEOS-Chem model for Indian monsoon region: Seasonal cycle and budget of tropospheric CO2
https://orcid.org/0000-0002-9288-8048
Abstract A nested GEOS-Chem atmosphere transport model has been set up for the Indian monsoon region (40° E-110° E & 15° S–45° N at 0.250X0.3125°) spatial resolution to study the variability of the tropospheric CO2 over India and surrounding oceans during 2012–2020. The model has been constrained by the influxes of CO2 at its four lateral boundaries derived from the GEOS-Chem global simulations and surface fluxes of CO2 over the land and oceans based on historical databases. It is initialized from a known state and driven by the GEOS reanalysis's meteorological forcing. Model simulations were evaluated at three in situ measurement locations and with respect to the satellite retrievals from OCO-2 and GOSAT. Model parameters were tuned to have reasonable solutions to resolve observed latitudinal gradient and seasonal and inter-annual variability. Three additional model runs were made to evaluate the role of long-range transport, net terrestrial ecosystem exchange, air-sea fluxes, and regional emissions in controlling seasonal oscillations of tropospheric CO2 over the study region. It revealed that the net terrestrial ecosystem exchanges are responsible for 35% control in the surface layer CO2 seasonal tendency for India and the Bay of Bengal domains, and 10% for the Arabian Sea. The air-sea fluxes have 8% control on the CO2 seasonal tendency for the Arabian Sea and Bay of Bengal and 5% for India. The anthropogenic emissions have 4% control for India and <1% for the Arabian Sea, and 9% for the Bay of Bengal. The long-range transport, as the residual, is responsible for 60% variability in the seasonal cycle of CO2 over India and the Bay of Bengal and 75% for the Arabian Sea domain.
Graphical abstract Display Omitted
Highlights High-resolution limited area GEOS-Chem 3D transport model for India. Decoupled experiments to study the role of terrestrial, oceanic fluxes & local emission. Tropospheric CO2 seasonal budget for India, Arabian Sea, and Bay of Bengal. Horizontal advection dominates the terrestrial & oceanic fluxes in the net tendency.
High-resolution GEOS-Chem model for Indian monsoon region: Seasonal cycle and budget of tropospheric CO2
https://orcid.org/0000-0002-9288-8048
Abstract A nested GEOS-Chem atmosphere transport model has been set up for the Indian monsoon region (40° E-110° E & 15° S–45° N at 0.250X0.3125°) spatial resolution to study the variability of the tropospheric CO2 over India and surrounding oceans during 2012–2020. The model has been constrained by the influxes of CO2 at its four lateral boundaries derived from the GEOS-Chem global simulations and surface fluxes of CO2 over the land and oceans based on historical databases. It is initialized from a known state and driven by the GEOS reanalysis's meteorological forcing. Model simulations were evaluated at three in situ measurement locations and with respect to the satellite retrievals from OCO-2 and GOSAT. Model parameters were tuned to have reasonable solutions to resolve observed latitudinal gradient and seasonal and inter-annual variability. Three additional model runs were made to evaluate the role of long-range transport, net terrestrial ecosystem exchange, air-sea fluxes, and regional emissions in controlling seasonal oscillations of tropospheric CO2 over the study region. It revealed that the net terrestrial ecosystem exchanges are responsible for 35% control in the surface layer CO2 seasonal tendency for India and the Bay of Bengal domains, and 10% for the Arabian Sea. The air-sea fluxes have 8% control on the CO2 seasonal tendency for the Arabian Sea and Bay of Bengal and 5% for India. The anthropogenic emissions have 4% control for India and <1% for the Arabian Sea, and 9% for the Bay of Bengal. The long-range transport, as the residual, is responsible for 60% variability in the seasonal cycle of CO2 over India and the Bay of Bengal and 75% for the Arabian Sea domain.
Graphical abstract Display Omitted
Highlights High-resolution limited area GEOS-Chem 3D transport model for India. Decoupled experiments to study the role of terrestrial, oceanic fluxes & local emission. Tropospheric CO2 seasonal budget for India, Arabian Sea, and Bay of Bengal. Horizontal advection dominates the terrestrial & oceanic fluxes in the net tendency.
High-resolution GEOS-Chem model for Indian monsoon region: Seasonal cycle and budget of tropospheric CO2
Allahudheen, S. (Autor:in) / Chandra, A Bhuvana (Autor:in) / Nayak, Rabindra K. (Autor:in) / Dadhwal, V.K. (Autor:in) / Krishnapriya, M. (Autor:in) / Lakshmaiah, M.V. (Autor:in)
Atmospheric Environment ; 309
17.06.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Observation of aerosol induced ‘lower tropospheric cooling’ over Indian core monsoon region
| DOAJ | 2021