Potential vorticity and eddy potential enstrophy in the North Atlantic Ocean simulated by a global eddy-resolving model |
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| Institution: | 1. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Haizhu District, Guangzhou 510301, China;2. South China Sea Marine Engineering Surveying Center, South China Sea Branch of State Oceanic Administration, 155 West Xingang Road, Haizhu District, Guangzhou 510300, China;3. Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, State Oceanic Administration, 6 Xian-Xia-Ling Road, Hi-Tech Industry Park, Qingdao 266061, China;1. Center for Space and Remote Sensing Research, National Central University, Taoyuan 320, Taiwan;2. Institute of Space Science, National Central University, Taoyuan 320, Taiwan;3. Academia Sinica, Taipei 115, Taiwan;4. George Mason University, Fairfax, VA 22030, USA;5. AFRL, Space Vehicle Directorate, Kirtland AFB, NM 87117, USA;6. Institute for Scientific Research, Boston College, MA 02467, USA;1. Department of Oceanography, Pusan National University, Busan, Republic of Korea;2. Scripps Institution of Oceanography, La Jolla, CA, USA |
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| Abstract: | Eight-year daily mean output of a quasi-global eddy-resolving model is examined with a focus on the large-scale dynamical characteristics of the North Atlantic Ocean in a framework of potential vorticity (PV) and its derivatives. The model has reproduced some of the observed features of the mean potential vorticity field well. The three-dimensional structure of the mean potential vorticity supports baroclinic instability in most of the basin. Eddies are found to play important roles in the formation and maintenance of the mean potential vorticity fields. The contribution of relative vorticity to the mean potential vorticity field is found to be negligible for the most part. However, relative vorticity contribution to the source/sink of potential vorticity and eddy potential enstrophy is not negligible. We also find that eddies are not necessarily diffusive even on a basin-scale. |
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