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The comparative analysis of interannual variability of global climate characteristics of the two hemispheres using adiabatic invariants

PI: Igor Pisnitchenko
Institution: Centro de Previsao de Tempo e Estudos Climaticos
Objective: We propose the investigation on climate variability using potential vorticity(PV)-entropy (PT) analysis. PV and PT of air particle are slowly transformed only due to the influence of irreversible factors (diabatic influxes of heat and friction). Consequently, some functionals based on adiabatic invariants may be considered as useful indices of climatic changes. The following two functionals are proposed in investigation of the climate variability in Northern and Southern Hepisphere: .the first functional is the air mass distribution on PV and PT values which gives direct insight on the changes of vortex and thermal statement of atmosphere; the second functional follows from fundamental freedom existing in Ertel's general definition of PV. It gives the possibility to introduce a novel invariant measure q which is an "optimal" modified PV in definition of which enters a monotonic increasing function r of potential temperature. This measure is preserved in idealized climate processes, when external diabatic heating and frictional forcing, being applied to zonally-oriented infinitely thin (q,r)-tubes (formed at the expense of intersection between iso-scalar surfaces q=const and r=const), annihilate each other. A reference stationary air mass distribution on (q, r)-values, introduced for both hemispheres separately, does not depend on r. This distribution is characterized by exponentially decaying function of the absolute value of q and has the same total amount of "PV substance" (atmospheric vorticity charge) as the actual atmospheric state. Comparisons of the monthly-mean air mass distribution on q for modern climate with this for various future scenarios give the valuable information on different reply of two hemispheres on climate forcing and will enable to quantify a degree of non-equilibrium of the real atmospheric climate processes, with respect to the introduced invariant measure.

Model data required: Daily data of: temperature, zonal and meridional wind, geopotential on all available levels, sea level pressure in different model scenarios.

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