Climate change and tides in Liverpool

image-20141201-20565-1eoo7rhIf you live within sight of the sea, as we do, then your life is probably influenced, to some degree, by the rise and fall of tides.  In Liverpool, we are lucky to have a particularly long historical record of tidal heights and one of my colleagues, an oceanographer, Professor Ric Williams has used this record to discuss climate variability.  The record was started and maintained between 1768 and 1793 by Captain William Hutchinson whose achievement is commemorated with a fountain in Liverpool’s historic docks, which are a UNESCO World Heritage Site.

A few weeks ago I listened to a talk by Prof Williams, in which he described how there is a rather simple relationship between surface warming and the effect of future emissions of greenhouse gases.  If the predictions of surface warming are plotted as a function of how much carbon is emitted to the atmosphere, rather than time, then a simple response emerges: the more carbon we emit, the warmer it will get. Associated with the surface warming, there is an expected sea level rise from the expansion of the water column augmented by the effect of addition of freshwater from melting of land ice. Watch Prof Williams’ Youtube video to find out more.

Sources:

Woodworth, P.L. 1999. High waters at Liverpool since 1768: the UK’s longest sea level record. Geophysical Research Letters, 26 (11), 1589-1592.

Goodwin, P., Williams, R.G. & Ridgwell, A., Sensitivity of climate to cumulative carbon emissions dues to compensation of ocean heat and carbon uptake, Nature Geoscience, 8,29–34(2015).

Image: http://theconversation.com/our-equation-proves-climate-change-is-linked-to-emissions-34897

 

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