Publication Date:
2019-07-13
Description:
The Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2) is the latest reanalysis produced by GMAO, and provides global data spanning the period 1980-present. The atmospheric data assimilation component of MERRA-2 used a 3D-Var scheme, which was operational at the time of its design. Since then, a Hybrid 3D-Var, then a Hybrid 4D-EnVar were implemented, adding an ensemble component to the data assimilation scheme. In this work, we will be examining the benefits of using hybrid ensemble flow-dependent covariances to represent errors and uncertainties in historic periods. Specifically, periods of pre- and post-satellites, as well as periods of active tropical cyclone seasons. Finally, we will also be exploring the use of adaptive localization scales.
Keywords:
Meteorology and Climatology; Statistics and Probability
Type:
GSFC-E-DAA-TN49550
,
International Conference on Reanalysis (ICR5) 2017; Nov 13, 2017 - Nov 17, 2017; Rome; Italy
Format:
application/pdf
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