The last three decades have been marked by major shifts in a number of climate modes of variability including the Atlantic Multi-decadal Oscillation and the Pacific Decadal Oscillation – shifts that have been linked to changes in drought and weather extremes throughout the world, as well as the recent hiatus in long-term surface temperature trends. Reanalyses offer a dynamically and physically consistent global interdisciplinary framework for assessing and understanding the nature of such regional changes. This session seeks contributions that take advantage of reanalyses of observations to address various aspects of climate variability and change as outlined above. This includes comparisons between the multi-disciplinary set of reanalyses of the Earth System(e.g. land, ocean, aerosol and cryosphere) and observations, downscaling of reanalyses including an assessment of changes in weather extremes, modeling (e.g., AGCM) studies that put the reanalysis results in the context of underlying climate uncertainty, as well as studies that seek to assess, understand and/or correct inhomogeneities that limit the usefulness of reanalyses for assessing low frequency variability and trends including efforts to improve the ability to produce consistent reanalyses of the coupled climate system.

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