Strongly Coupled Data Assimilation Using Leading Averaged Coupled Covariance (LACC). Part III: Assimilation of Real World Reanalysis

Sun, Jingzhe; Liu, Zhengyu; Lu, Feiyu; Zhang, Weimin; Zhang, Shaoqing

doi:10.1175/MWR-D-19-0304.1

i

Strongly Coupled Data Assimilation Using Leading Averaged Coupled Covariance (LACC). Part III: Assimilation of Real World Reanalysis

Supporting Files

2020
By Sun, Jingzhe ; Liu, Zhengyu ; Lu, Feiyu ; ...

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Journal Title:

Monthly Weather Review
Personal Author:

Sun, Jingzhe ; Liu, Zhengyu ; Lu, Feiyu ; Zhang, Weimin ; Zhang, Shaoqing
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; CIMSS (Cooperative Institute for Meteorological Satellite Studies) ; CIMES (Cooperative Institute for Modeling the Earth System)
Description:

Recent studies proposed leading averaged coupled covariance (LACC) as an effective strongly coupled data assimilation (SCDA) method to improve the coupled state estimation over weakly coupled data assimilation (WCDA) in a coupled general circulation model (CGCM). This SCDA method, however, has been previously evaluated only in the perfect model scenario. Here, as a further step toward evaluating LACC for real world data assimilation, LACC is evaluated for the assimilation of reanalysis data in a CGCM. Several criteria are used to evaluate LACC against the benchmark WCDA. It is shown that despite significant model bias, LACC can improve the coupled state estimation over WCDA. Compared to WCDA, LACC increases the globally averaged anomaly correlation coefficients (ACCs) of sea surface temperature (SST) by 0.036 and atmosphere temperature at the bottom level (T-s) by 0.058. However, there also exist regions where WCDA outperforms LACC. Although the reduction in the anomaly root-mean-square error (RMSE) is not as consistently clear as the increase in ACC, LACC can largely correct the biased model climatology.
Keywords:

Atmosphere Atmospheric Sciences Kalman Filter Meteorology Temperature Kalman Filter
Source:

Monthly Weather Review, 148(6), 2351-2364.
DOI:

https://doi.org/10.1175/MWR-D-19-0304.1
Document Type:

Journal Article
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Submitted
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urn:sha256:f06ac98bbae7596634a1e6da06b70b28af4796526ea80a9ca04dd92b19e2fd4d
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https://repository.library.noaa.gov/view/noaa/29947/noaa_29947_DS1.pdf
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[PDF - 3.90 MB ]

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