Models
type: Concept

NASA-GISS-3D-Tracer-Transport
type: Concept
alternative label: NASA GISS 3-Dimensional (3-D) Global Tracer Transport Model
change note: 2018-12-28 16:50:08.0 [sritz] insert AltLabel (id: null category: null text: NASA GISS 3-Dimensional (3-D) Global Tracer Transport Model language code: en);
change note: 2018-12-28 16:49:22.0 [sritz] Insert Concept add broader relation (NASA-GISS-3D-Tracer-Transport [16ddc50b-7bb0-4a13-adef-dbdd5e2e2bcd,368403] - Models/Analyses [113ecbc2-ab36-4d58-a96c-a6ce0106e749,344529]);
change note: 2021-11-30 13:30:28.0 [tstevens] Move Concepts delete broader relation (null); add broader relation (NASA-GISS-3D-Tracer-Transport [16ddc50b-7bb0-4a13-adef-dbdd5e2e2bcd,826005] - Models [0a184cdc-c074-4946-90a6-02f03c686341,835911]);
change note: 2022-03-11 13:21:57.0 [tstevens] insert Definition (id: null text: A three-dimensional tracer transport model is used to investigate the annual cycle of atmospheric CO2 concentration produced by seasonal exchanges with the terrestrial biosphere. The tracer model uses winds generated by a global general circulation model to advect and convect CO2; no explicit diffusion coefficients are employed. A biospheric exchange function constructed from a map of net primary productivity, and Alzvedo's (1982) seasonality of CO2 uptake and release closely simulates the annual cycles at coastal stations. The results show that zonal homogeneity in surface CO2 concentrations can never be achieved at mid-latitudes where the time scale for zonal mixing is longer than the time scale for biospheric exchange. Analysis of the zonal mean balance in the lower troposphere reveals that atmospheric transport processes may later the CO2 response to local biospheric exchanges by 50% or more. Hence year-to-year variation of the annual CO2 cycle may result from the natural variability of the atmospheric circulation as well as from changes in the sources and sinks. language code: en);
definition: A three-dimensional tracer transport model is used to investigate the annual cycle of atmospheric CO2 concentration produced by seasonal exchanges with the terrestrial biosphere. The tracer model uses winds generated by a global general circulation model to advect and convect CO2; no explicit diffusion coefficients are employed. A biospheric exchange function constructed from a map of net primary productivity, and Alzvedo's (1982) seasonality of CO2 uptake and release closely simulates the annual cycles at coastal stations. The results show that zonal homogeneity in surface CO2 concentrations can never be achieved at mid-latitudes where the time scale for zonal mixing is longer than the time scale for biospheric exchange. Analysis of the zonal mean balance in the lower troposphere reveals that atmospheric transport processes may later the CO2 response to local biospheric exchanges by 50% or more. Hence year-to-year variation of the annual CO2 cycle may result from the natural variability of the atmospheric circulation as well as from changes in the sources and sinks.
in scheme: platforms