Abstract
The mixed layer is deep in January–April in the Kuroshio Extension region. This paper investigates the response in this region of mixed layer depth (MLD) and the spring bloom initiation to global warming using the output of 15 models from CMIP5. The models indicate that in the late 21st century the mixed layer will shoal, and the MLD reduction will be most pronounced in spring at about 33°N on the southern edge of the present deep-MLD region. The advection of temperature change in the upper 100 m by the mean eastward flow explains the spatial pattern of MLD shoaling in the models. Associated with the shoaling mixed layer, the onset of spring bloom inception is projected to advance due to the strengthened stratification in the warming climate.
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References
Behrenfeld, M. J., 2010: Abandoning Sverdrup’s critical depth hypothesis on phytoplankton blooms. Ecology, 91(4), 977–989.
Boss, E., and M. Behrenfeld, 2010: In situ evaluation of the initiation of the North Atlantic phytoplankton bloom. Geophys. Res. Lett., 37, L18603, doi: 10.1029/2010GL044174.
Chiswell, S. M., 2011: Annual cycles and spring blooms in phytoplankton: Don’t abandon Sverdrup completely. Marine Ecology Progress Series, 443, 39–50.
Chiswell, S. M., P. H. R. Calil, and P. W. Boyd, 2015: Spring blooms and annual cycles of phytoplankton: a unified perspective. Journal of Plankton Research, 37(3), 500–508.
Gill, A. E., 1982: Atmosphere-Ocean Dynamics. Academic press, 662 pp.
Hashioka, T., T. T. Sakamoto, and Y. Yamanaka, 2009: Potential impact of global warming on north Pacific spring blooms projected by an eddy-permitting 3-D ocean ecosystem model. Geophys. Res. Lett., 36, L20604.
Held, I. M., M. Winton, K. Takahashi, T. Delworth, F. R. Zeng, and G. K. Vallis, 2010: Probing the fast and slow components of global warming by returning abruptly to preindustrial forcing. J. Climate, 23(9), 2418–2427.
Huisman, J. E. F., P. van Oostveen, and F. J. Weissing, 1999: Critical depth and critical turbulence: Two different mechanisms for the development of phytoplankton blooms. Limnology and Oceanography, 44(7), 1781–1787.
Kara, A. B., P. A. Rochford, and H. E. Hurlburt, 2003: Mixed layer depth variability over the global ocean. J. Geophys. Res., 108, 3079, doi: 10.1029/2000C000736.
Kraus, E. B., and J. S. Turner, 1967: A one-dimensional model of the seasonal thermocline II. The general theory and its consequences. Tellus, 19(1), 98–106.
Kraus, E. B., and J. A. Businger, 1995: Atmosphere-Ocean Interaction, 2nd ed., Oxford University Press, 362 pp.
Long, S.-M., S.-P. Xie, X.-T. Zheng, and Q. Y. Liu, 2014: Fast and slow responses to global warming: Sea surface temperature and precipitation patterns. J. Climate, 27(1), 285–299.
Luo, Y. Y., Q. Y. Liu, and L. M. Rothstein, 2009: Simulated response of north Pacific mode waters to global warming. Geophys. Res. Lett., 36, L23609, doi: 10.1029/2009GL040906.
Mann, K., and J. Lazier, 2005: Dynamics of Marine Ecosystems: Biological-Physical Interactions in the Oceans. Wiley-Blackwell, 496 pp.
Murtugudde, R., J. Beauchamp, C. R. McClain, M. Lewis, and A. J. Busalacchi, 2002: Effects of penetrative radiation on the upper tropical Ocean circulation. J. Climate, 15(5), 470–486.
Nakamoto, S., S. P. Kumar, J. M. Oberhuber, J. Ishizaka, K. Muneyama, and R. Frouin, 2001: Response of the equatorial Pacific to chlorophyll pigment in a mixed layer isopycnal ocean general circulation model. Geophys. Res. Lett., 28(10), 2021–2024.
Qiu, B., and K. A. Kelly, 1993: Upper-ocean heat balance in the Kuroshio extension region. J. Phys. Oceanogr., 23(9), 2027–2041.
Qiu, B., N. Schneider, and S. M. Chen, 2007: Coupled decadal variability in the north pacific: An observationally constrained idealized model. J. Climate, 20(14), 3602–3620.
Sakamoto, T. T., H. Hasumi, M. Ishii, S. Emori, T. Suzuki, T. Nishimura, and A. Sumi, 2005: Responses of the Kuroshio and the Kuroshio extension to global warming in a highresolution climate model. Geophys. Res. Lett., 32, L14617, doi: 10.1029/2005GL023384.
Sato, Y., S. Yukimoto, H. Tsujino, H. Ishizaki, and A. Noda, 2006: Response of North Pacific Ocean circulation in a Kuroshioresolving ocean model to an Arctic Oscillation (AO)-like change in Northern Hemisphere atmospheric circulation due to greenhouse-gas forcing. J. Meteor. Soc. Japan, 84, 295–309.
Sverdrup, H. U., 1953: On conditions for the vernal blooming of phytoplankton. Journal du Conseil International Pour l’Exploration de la Mer, 18(3), 287–295.
Taguchi, B., S.-P. Xie, N. Schneider, M. Nonaka, H. Sasaki, and Y. Sasai, 2007: Decadal variability of the Kuroshio extension: observations and an eddy-resolving model hindcast. J. Climate, 20(11), 2357–2377.
Taylor, J. R., and R. Ferrari, 2011: Shutdown of turbulent convection as a new criterion for the onset of spring phytoplankton blooms. Limnology and Oceanography, 56(6), 2293–2307.
Taylor, K. E., R. J. Stouffer, and G. A. Meehl, 2012: An overview of CMIP5 and the experiment design. Bull. Amer. Meteor. Soc., 93(4), 485–498.
Vecchi, G. A., and B. J. Soden, 2007: Global warming and the weakening of the tropical circulation. J. Climate, 20(17), 4316–4340.
Wu, L., Z. Liu, R. Gallimore, R. Jacob, D. Lee, and Y. Zhong, 2003: Pacific decadal variability: The tropical Pacific mode and the north Pacific mode. J. Climate, 16(8), 1101–1120.
Wu, L. X., and Coauthors, 2012: Enhanced warming over the global subtropical western boundary currents. Nature Climate Change, 2(3), 161–166.
Xie, S.-P., C. Deser, G. A. Vecchi, J. Ma, H. Y. Teng, and A. T. Wittenberg, 2010: Global warming pattern formation: Sea surface temperature and rainfall. J. Climate, 23(4), 966–986.
Xu, L. X., S.-P. Xie, and Q. Y. Liu, 2012: Mode water ventilation and subtropical countercurrent over the north Pacific in CMIP5 simulations and future projections. J. Geophys. Res.-Oceans, 117, C12009, doi: 10.1029/2012JC008377.
Xu, L. X., S.-P. Xie, and Q. Y. Liu, 2013: Fast and slow responses of the north Pacific mode water and subtropical countercurrent to global warming. Journal of Ocean University of China, 12(2), 216–221.
Xu, L. X., S.-P. Xie, J. L. McClean, Q. Y. Liu, and H. Sasaki, 2014: Mesoscale eddy effects on the subduction of north Pacific mode waters. J. Geophys. Res., 119, 4867–4886, doi: 10.1002/2014JC009861.
Yentsch, C. S., 1990: Estimates of ‘new production’ in the Mid-North Atlantic. Journal of Plankton Research, 12, 717–734.
Yim, B. Y., Y. Noh, S. W. Yeh, J. S. Kug, H. S. Min, and B. Qiu, 2013: Ocean mixed layer processes in the Pacific decadal oscillation in coupled general circulation models. Climate Dyn., 41(5–6), 1407–1417.
Yu, L., X. Jin, and R. A. Weller, 2006: Role of net surface heat flux in seasonal variations of sea surface temperature in the tropical Atlantic Ocean. J. Climate, 19(23), 6153–6169.
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Zhang, R., Xie, SP., Xu, L. et al. Changes in mixed layer depth and spring bloom in the Kuroshio extension under global warming. Adv. Atmos. Sci. 33, 452–461 (2016). https://doi.org/10.1007/s00376-015-5113-8
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DOI: https://doi.org/10.1007/s00376-015-5113-8