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- W4221001183 abstract "<p>Anthropogenically induced radiative imbalances in the climate system lead to a slow accumulation of heat in the ocean. This warming is often obscured by natural modes of climate variability such as the El Nino-Southern Oscillation (ENSO), which drive substantial ocean temperature changes as a function of depth and latitude. The use of watermass coordinates has been proposed to help isolate forced signals and filter out fast adiabatic processes associated with modes of variability. However, how much natural modes of variability project into these different coordinate systems has not been quantified. Here we apply a rigorous framework to quantify ocean temperature variability using both a quasi-Lagrangian watermass-based temperature coordinate and Eulerian depth and latitude coordinates in a free-running climate model under pre-industrial conditions. The temperature-based coordinate effectively filters out the adiabatic component of ENSO-dominated interannual variability, while a substantial diabatic signal remains. At slower (decadal to centennial) frequencies, variability in the temperature- and depth-based coordinates is comparable. Spectral analysis of temperature tendencies reveals the dominance of advective processes in latitude- and depth-coordinates while the variability in temperature-coordinates is related closely to the surface forcing. Diabatic mixing processes play an important role at slower frequencies where quasi steady-state balances emerge between forcing and mixing in temperature, advection and mixing in depth and forcing and advection in latitude. Our work suggests that watermass based analyses accurately filter out adiabitic variability and highlight diabatic effects, but also that natural variability has a strong diabatic component and can not be ignored in the analysis of long term trends.</p>" @default.
- W4221001183 created "2022-04-03" @default.
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- W4221001183 date "2022-03-27" @default.
- W4221001183 modified "2023-09-27" @default.
- W4221001183 title "Adiabatic and diabatic signatures of ocean temperature variability" @default.
- W4221001183 doi "https://doi.org/10.5194/egusphere-egu22-2085" @default.
- W4221001183 hasPublicationYear "2022" @default.
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