Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Seasonal variation in the long-term warming trend in water temperature off the Western Australian coast

N. Caputi A C , S. de Lestang A , M. Feng B and A. Pearce A

A Western Australian Fisheries and Marine Research Laboratories, Department of Fisheries, PO Box 20, North Beach, WA 6920, Australia.

B CSIRO Marine and Atmospheric Research, Private Bag 5, Wembley, WA 6913, Australia.

C Corresponding author. Email: nick.caputi@fish.wa.gov.au

Marine and Freshwater Research 60(2) 129-139 https://doi.org/10.1071/MF08199
Submitted: 30 June 2008  Accepted: 20 October 2008   Published: 20 February 2009

Abstract

Previous studies have demonstrated that one area of greatest increase in surface sea temperatures (SST) (0.02°C per year) in the Indian Ocean over the last 50 years occurs off the lower west coast of Australia, an area dominated by the Leeuwin Current. The present paper examines water temperature trends at several coastal sites since the early 1970s: two rock lobster puerulus monitoring sites in shallow water (<5 m); four sites from a monitoring program onboard rock lobster vessels that provide bottom water temperature (<36 m); and an environmental monitoring site at Rottnest (0–50 m depth). Two global SST datasets are also examined. These data show that there was a strong seasonal variation in the historic increases in temperature off the lower west coast of Australia, with most of the increases (0.02–0.035°C per year) only focussed on 4–6 months over the austral autumn–winter with little or no increase (<0.01°C per year) apparent in the austral spring–summer period. These increases are also apparent after taking into account the interannual variation in the strength of the Leeuwin Current. The warming trend results in a change to the seasonal temperature cycle over the decades, with a delay in the peak in the temperature cycle during autumn between the 1950s and 2000s of ~10–20 days. A delay in the timing of the minimum temperature is also apparent at Rottnest from August–September to October. This seasonal variation in water temperature increases and its effect on the annual temperature cycle should be examined in climate models because it provides the potential to better understand the specific processes through which climate change and global warming are affecting this region of the Indian Ocean. It also provides an opportunity to further test the climate models to see whether this aspect is predicted in the future projections of how increases will be manifest. Any seasonal variation in water temperature increase has important implications for fisheries and the marine ecosystem because it may affect many aspects of the annual life cycle such as timing of growth, moulting, mating, spawning and recruitment, which have to be taken into account in the stock assessment and management of fisheries.


Acknowledgements

The sampling on board the commercial rock lobster vessels was undertaken by the Department of Fisheries research technical staff (headed by Mark Rossbach) and the Rottnest environmental station was sampled by CSIRO staff. Department of Fisheries and CSIRO contributed to the sampling of the puerulus monitoring sites. We acknowledge Jenny Moore for her assistance with the databases and figures and internal reviewers at Department of Fisheries and CSIRO for their comments. This research is partly supported by Western Australian Marine Science Institution.


References

Bates B. C., Hope P., Ryan B., Smith I., Charles S. (2008). Key findings from the Indian Ocean Climate Initiative and their impact on policy development in Australia. Climatic Change, in press.

Caputi, N. , Chubb, C. F. , and Pearce, A. (2001). Environmental effects on recruitment of the western rock lobster, Panulirus cygnus. Marine and Freshwater Research 52, 1167–1175.
CrossRef |

Caputi N., Melville-Smith R., de Lestang S., Pearce A., and Feng M. (in prep.). The effect of climate change on the western rock lobster (Panulirus cygnus) fishery of Western Australia.

Cresswell, G. R. , and Golding, T. J. (1980). Observations of a south-flowing current in the southeastern Indian Ocean. Deep-Sea Research 27, 449–466.
CrossRef |

de Lestang S. (2002). Biology of the blue swimmer crab, Portunus pelagicus (Linnaeus), in Western Australia. Ph.D. Thesis, Murdoch University, Perth.

Durack P. J. (2002). The effect of predicted climate change on Western Australian regional oceanography. B.Sc. (Hons) Thesis, School of Environmental Science, Murdoch University, Perth.

Feng, M. , Meyers, G. , Pearce, A. , and Wijffels, S. (2003). Annual and interannual variations of the Leeuwin Current at 32°S. Journal of Geophysical Research 108, 3355.
CrossRef |

Feng, M. , Li, Y. , and Meyers, G. (2004). Multidecadal variations of Fremantle sea level: footprint of climate variability in the tropical Pacific. Geophysical Research Letters 31, L16302.
CrossRef |

Feng, M. , Majewski, L. , Fandry, C. , and Waite, A. (2007). Characteristics of two counter-rotating eddies in the Leeuwin Current system off the Western Australian coast. Deep-Sea Research. Part II, Topical Studies in Oceanography 54, 961–980.
CrossRef |

Feng M., Biastoch A., Böning C. and Caputi N., Meyers G. (2008). Seasonal and interannual variations of upper ocean heat balance off the west coast of Australia. Journal of Geophysical Research, in press. doi:10.1029/2008JC004908

Hare, S. R. , and Mantua, N. J. (2000). Empirical evidence for North Pacific regime shifts in 1977 and 1989. Progress in Oceanography 47, 103–145.
CrossRef |

Joll, L. M. , and Caputi, N. (1995). Environmental influences on recruitment in the saucer scallop (Amusium balloti) fishery of Shark Bay, Western Australia. ICES Marine Science Symposia 199, 47–53.


Li, Y. , Cai, W. , and Campbell, E. P. (2005). Statistical modelling of extreme rainfall in southwest Western Australia. Journal of Climate 18, 852–863.
CrossRef |

Lough, J. M. (2008). Shifting climate zones for Australia’s tropical marine ecosystems. Geophysical Research Letters 35, L14708.
CrossRef |

Nelder, J. A. , and Wedderburn, R. W. M. (1972). Generalized linear models. Journal of the Statistical Society Series A: Statistics in Society 135, 370–384.
CrossRef |

Pearce, A. , and Feng, M. (2007). Observations of warming on the Western Australian continental shelf. Marine and Freshwater Research 58, 914–920.
CrossRef |

Pearce, A. , and Phillips, B. F. (1988). ENSO events, the Leeuwin Current and larval recruitment of the western rock lobster. Journal du Conseil 45, 13–21.


Poloczanska, E. S. , Babcock, R. C. , Butler, A. , Hobday, A. J. , Hoegh-Guldberg, O. , Kunz, T. J. , Matear, R. , Milton, D. , Okey, T. A. , and Richardson, A. J. (2007). Climate change and Australian marine life. Oceanography and Marine Biology: An Annual Review 45, 409–480.


Rayner, N. A. , Parker, D. E. , Horton, E. B. , Folland, C. K. , Alexander, L. V. , Rowell, D. P. , Kent, E. C. , and Kaplan, A. (2003). Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century. Journal of Geophysical Research 108, 4407.
CrossRef |

Smith, T. M. , and Reynolds, R. W. (2004). Improved extended reconstruction of SST (1854–1997). Journal of Climate 17, 2466–2477.
CrossRef |

Solomon S., et al. (2007). Technical summary. In ‘Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change’. (Eds S. Solomon, D. Qin, M. Manning, Z. Chen, M. Marquis, K. B. Averyt, M. Tignor and H. L. Miller.) (Cambridge University Press: Cambridge, UK.)

Trenberth K. E., et al. (2007). Observations: surface and atmospheric climate change. In ‘Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change’. (Eds S. Solomon, D. Qin, M. Manning, Z. Chen, M. Marquis, K. B. Averyt, M. Tignor and H. L. Miller.) (Cambridge University Press: Cambridge, UK.)

Wakefield C. (2006). Latitudinal and temporal comparisons of the reproductive biology and growth of snapper, Pagrus auratus (Sparidae), in Western Australia. Ph.D. Thesis, Murdoch University, Perth.



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