Data

Your access to IMOS Western Australia Mooring data discovery and exploration is through the Australian Ocean Data Network (AODN) Portal.

The data streams collected from sensor measurements are suitable for a number of research tasks:

Validating numerical models

Vertical profiles of model-data comparison for all Two Rocks transect moorings TWR55, TWR105, TWR155, TWR205, TWR505. The profiles show the model's (a) mean bias ( °C) and (b) skill score, where the symbols corresponding to each mooring are shown in the right panel

(from Benthuysen, J., M. Feng, L. Zhong (2014), Spatial patterns of warming off Western Australia during the 2011 Ningaloo Nino: quantifying impacts of remote and local forcing. Continental Shelf Research 91, 232-246).

Understanding the mixed layer structure of the Leeuwin Current

(a), Sea surface temperature anomalies during 21 February – 6 March 2011 at the peak of the extreme warming event. (b), A zoomed-in view of the temperature anomaly pattern off the west coast of Australia. (c), Daily sea surface temperature during January – April 2011 for the region off the west coast of Australia (averaged over 28° – 32°S, 112° – 115°E). (d), (e), wind direction and speed at the coastal station on the Rottnest Island. 180 denote southerly winds so that the winds are dominantly southeastlies. (f), Daily air temperatures measured at the coastal station on the Rottnest Island. (g), Moored temperature observations on the continental shelf off Western Australia coast (31°59.0'S, 115°14.0'E). The blue dotted line denotes the surface mixed layer depth (defined as 0.5°C from the surface temperature). (h), Temperature profiles observed before (18 January 2011) and at the peak (7 March) of the maximum temperature anomalies observed from an Argo float located to the west of the warming centre. (i), Temperature anomalies of the Argo profiles from the CSIRO Atlas of Regional Seas (CARS) climatology. The locations of Rottnest Island, Fremantle, shelf mooring and Argo profiles are denoted in (b).

(From Feng, M., McPhaden, M. J., Xie, S., & Hafner, J. La Niña forces unprecedented Leeuwin Current warming in 2011. Scientific Reports 3, 1277; DOI:10.1038/srep01277 (2013).)

Understanding shelf circulation and tidal currents

Understanding long term environmental change

The shorter (1985–2004) time series from the Rottnest station and the puerulus collection sites show similar trends although the slope of the trend lines is appreciably higher than for the longer 5-decade series, implying an acceleration in the warming rate. Temperatures at the Rottnest Island and Jurien sites rose by ~0.034°C year–1 and those at Rat Island and Dongara by 0.026–0.029°C year–1. The correlation between the temperature at the Rottnest station and the other three shelf sites over the 20-year period is 0.704 (Dongara), 0.794 (Jurien) and 0.855 (the offshore Rat Island site) – all highly significant at the 99% level

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

Understanding nutrient dynamics and variation

From Thompson, P, Baird, ME, Ingleton, T, Doblin, MA 2009, Long-term changes in temperate Australian coastal waters: implications for phytoplankton, Marine Ecology Progress Series, vol. 394, pp. 1-19, doi:10.3354/meps08297

Data coverage of the Western Australia moorings