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cisco said..SandS said..
those images and stories should help us all understand that sea levels are rising .
Not quite with you there SandS.
Do the recorded tidal observations at say Fort Denison in Sydney Harbour or the observation point in Port Phillip Bay over the last 100 odd years CONFIRM that sea levels ARE rising, or, are rising sea levels just a local anomaly at the Pacific islands and Bangladesh???????
So if you hear thunder and look to the east and see no storm do you assume there is no storm or do you perhaps look to the North, South or West as well?
The following is from a paper by Ben Modra from the Manly Hydraulics Laboratory who manage most of the tide gauges in NSW, the link to the paper is below.
The Fort Denison tidal dataset managed by Sydney Ports Corporation is one of the most valued tidal records in Australia, and is invaluable when addressing long-term changes to east Australian water level, and the south-west Pacific Ocean state. For this analysis it provides a context in which to interpret long-term levels of the OEH network of tide gauges. Figure 4 shows monthly average and yearly averaged water level data from Fort Denison. The record has not been adjusted for anomaly drivers (such as MSLP), so represents the measured water level at the gauge. The long-term sea level trend of 0.94 mm/year is clearly apparent, as are variations to the average rate of rise.
The last 20-year period, covering the data range of the other MHL gauging sites, is associated with sustained El Nino conditions, generally associated with drier, less stormy conditions in Australia. This causes a depressing of regional sea levels and is seen as a slowing of sea level rise in the Fort Denison data to 0.4 mm/year for 1986- 2007 (MHL1881). This would imply that gauges across NSW with datasets of approximately 20 years will underestimate sea level rise. new.mhl.nsw.gov.au/docs/tide/NSW%20Coastal%20Conference%202011%20OceanWaterLevels.pdfI'll be working at the Manly Hydraulics lab next week and will track Ben down for a discussion on this matter.
The following is from CSIRO's State of the Climate 2018:
? Australia's climate has warmed by just over 1 ?C since 1910, leading to an increase in the frequency of extreme heat events.
? Oceans around Australia have warmed by around 1 ?C since 1910, contributing to longer and more frequent marine heatwaves.
? Sea levels are rising around Australia, increasing the risk of inundation.
? The oceans around Australia are acidifying (the pH is decreasing).
? April to October rainfall has decreased in the southwest of Australia. Across the same region May-July rainfall has seen the largest decrease, by around 20 per cent since 1970.
? There has been a decline of around 11 per cent in April-October rainfall in the southeast of Australia since the late 1990s.
? Rainfall has increased across parts of northern Australia since the 1970s.
? Streamflow has decreased across southern Australia. Streamflow has increased in northern Australia where rainfall has increased.
? There has been a long-term increase in extreme fire weather, and in the length of the fire season, across large parts of Australia.
www.csiro.au/en/Showcase/state-of-the-climate