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Impact of DYNAMO observations on NASA GEOS-5 reanalyses and the representation of MJO initiation
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2017
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Source: Journal of Geophysical Research: Atmospheres, 122(1), 179-201
[PDF-3.88 MB]
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Journal Title:Journal of Geophysical Research: Atmospheres
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Description:This study examines the impact of the Dynamics of the Madden-Julian Oscillation (DYNAMO) campaign in situ observations on NASA Goddard Earth Observing System version 5 (GEOS-5) reanalyses and the improvements gained thereby in the representation of the Madden-Julian Oscillation (MJO) initiation processes. To this end, we produced a global, high-resolution (1/4° spatially) reanalysis that assimilates thelevel-4, quality-controlled DYNAMO upper air soundings from about 87 stations in the equatorial Indian Ocean region along with a companion data-denied control reanalysis. The DYNAMO reanalysis produces a more realistic vertical structure of the temperature and moisture in the central tropical Indian Ocean bycorrecting the model biases, namely, the cold and dry biases in the lower troposphere and warm bias in the upper troposphere. The reanalysis horizontal winds are substantially improved, in that, the westerly
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Source:Journal of Geophysical Research: Atmospheres, 122(1), 179-201
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ISSN:2169-897X
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