Bob "sea level" Kopp is at it again

As we saw recently, Bob is the "semi-empirical" man  -- i.e. he guesses a lot.  One of Australia's far Left webzines seems not to have picked that up.  Their article below meekly accepts the assertions of Bob and his friends about coastal flooding in the USA.  In my usual pesky way, however, I have had a look at the source article to see where the numbers come from.  Below is what I found in the Executive Summary:

"Human-caused climate change is contributing to global sea level rise and consequently aggravating coastal floods. This analysis removes the assessed human-caused component in global sea level from hourly water level records since 1950 at 27 U.S. tide gauges, creating alternative histories simulating the absence of anthropogenic climate change. Out of 8,726 days when unaltered water level observations exceeded National Weather Service local “nuisance” flood thresholds for minor impacts, 5,809 days (3,517-7,332 days, >90% confidence interval) did not exceed thresholds in the alternative histories.

In other words, human-caused global sea level rise effectively tipped the balance, pushing high water events over the threshold, for about two-thirds of the observed flood days. The fraction has increased from less than half in the 1950s, to more than three-quarters within the last decade (2005-2014), as global sea level has continued to rise."

So Bob was just guessing again. HOW did he "assess" the human-caused component in sea level rise?  By the same "semi-empirical" methods he has used elsewhere.  There is no way you can tease out a human component in sea level rise without using assumptions.  And sea-level rise in recent years has been so slow that there is little likelihood that there is any human-caused component in it at all.

But the fun does not stop there. Bob says that the period 2005-2014 shows the human influence particularly strongly.  WHICH human influence?  There was no global warming at all during that period according to the satellites so the "influence" cannot be anything due to global warming.

Just another example of Warmist theory running away from the data

New research released this week has dusted down the “human fingerprints on thousands of recent floods”, and found that sea level rise was the cause of two thirds of American floods since 1950.

The study looked at 27 tidal gauges around the United States, and found that since mid-century nearly 6,000 ‘nuisance’ floods would not have happened if not for human-induced greenhouse gas emissions.

And as sea levels rise, things are only getting worse: Since 1950, there has been an unbroken upward trend in the number of flood days caused by anthropogenic climate change, according to the report published by American think-tank Climate Central.

Between 1955 and 1965, around 45 per cent flood events were attributed to climate change. In the decade to 2014 however, a staggering 76 per cent of floods were pushed over the levee by mankind.

The study drew its conclusions by taking estimates of how much sea-level rise humans have caused, and detracting that unnatural increase from the levels reached during a given flood event.

If the National Weather Service’s threshold for a ‘nuisance flood’ wouldn’t have been crossed without sea-level rise caused by unnatural emissions, it was found to have been ‘caused’ by climate change.

The floods in question don’t neccesarily cause major damage, but the report said they “do cause material harm, inconvenience and economic drag”.


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