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An evaluation of high-resolution ocean reanalyses in the California current system
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2023
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Source: Progress in Oceanography 210 (2023) 102951
[PDF-3.79 MB]
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Journal Title:Progress in Oceanography
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Description:Sparse and inconsistent coverage of ocean observations makes analysis of climate impacts on ocean physics and marine ecosystems challenging. As a result, ocean reanalyses (i.e., ocean models constrained by observations through data assimilation) were developed to provide historical ocean state estimates that are spatially and temporally uniform. Recent advances in high performance computing and the number and quality of observations have led to the development of high-resolution ocean reanalyses, which offer an opportunity to investigate coastal ocean variability with enhanced fidelity. In this study, we evaluate the ability of three high-resolution ocean reanalyses, including the Global Ocean Reanalysis and Simulations (GLORYS), the Ocean Reanalysis System version 5 (ORAS5), and the California Current System Reanalysis (CCSRA), to accurately represent ocean temperature and salinity (from the surface to the bottom), sea surface height, and mesoscale activity in the California Current Large Marine Ecosystem (CCLME). Specifically, we compare these reanalyses to a variety of assimilated and independent in situ and satellite derived observations along the U.S. west coast. We find that the reanalyses generally reproduce large-scale variability in temperature and sea surface height within the CCLME, including effects of major ENSO events and recent marine heatwaves. We also show that GLORYS and CCSRA, with their finer horizontal resolution, have enhanced fidelity in simulating nearshore ocean parameters such as coastal sea level and bottom temperature along the continental shelf. Our results suggest that these tools can be used to study the fine-scale features of the California Current System over the past several decades.
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Source:Progress in Oceanography 210 (2023) 102951
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Rights Information:Accepted Manuscript
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Compliance:Submitted
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