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Krzysztof Wargan and Lawrence Coy

updates, described by Molod et al. (2015) , pertain mostly to tropospheric physics but also include a modification of the gravity wave drag parameterization scheme, which has significant impacts on stratospheric dynamics, for example, on the representation of the quasi-biennial oscillation. In the period considered in this study (2004–2015), MERRA-2 assimilates between 2 and 5 million observations per 6-h cycle (approximately 3 million in 2009), mainly radiances from the Atmospheric Infrared Sounder

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