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Global warming slowing ocean circulation
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Author:  Wayne Stollings [ Tue Mar 24, 2015 7:17 am ]
Post subject:  Global warming slowing ocean circulation

http://wapo.st/1N1hzaD

And now this week brings news of another potential mega-scale perturbation. According to a new study just out in Nature Climate Change by Stefan Rahmstorf of the Potsdam Institute for Climate Impact Research and a group of co-authors, we’re now seeing a slowdown of the great ocean circulation that, among other planetary roles, helps to partly drive the Gulf Stream off the U.S. east coast. The consequences could be dire – including significant extra sea level rise for coastal cities like New York and Boston.

Author:  Johhny Electriglide [ Tue Mar 24, 2015 1:37 pm ]
Post subject:  Re: Global warming slowing ocean circulation

I remember reading a few years or more back, that since 1950 the Gulf Stream had slowed 30%. Then a claptrap article very recently saying it had increased in speed. Cold water influx from melting ice has slowed at least the Gulf Stream. I would think that after all the ice has melted, the currents will speed up.
I don't think there will be anyone measuring it........

Author:  Milton Banana [ Tue Mar 24, 2015 2:35 pm ]
Post subject:  Re: Global warming slowing ocean circulation

Bull cookies as usual.

http://wattsupwiththat.com/2015/03/24/m ... otherwise/

Quote:
From your “Day after Tomorrow” department (where a slowing Gulf Stream turned NYC into an icebox) comes this claim from the bowels of Mannian Science. Unfortunately, it looks to be of the caliber of Mann’s Hockey Schtick science.
day-after-tomorrow

As WUWT reported on a peer reviewed paper last year, H. Thomas Rossby says: URI oceanographer refutes claims that climate change is slowing pace of Gulf Stream saying in a paper published in Geophysical Research Letters:



“The ADCP measures currents at very high accuracy, and so through the repeat measurements we take year after year, we have a very powerful tool by which to monitor the strength of the current,” said Rossby. “There are variations of the current over time that are natural — and yes, we need to understand these better — but we find absolutely no evidence that suggests that the Gulf Stream is slowing down.”

Author:  Wayne Stollings [ Tue Mar 24, 2015 6:53 pm ]
Post subject:  Re: Global warming slowing ocean circulation

Milton Banana wrote:
Bull cookies as usual.


Yes, you present them all of the time.

Quote:
http://wattsupwiththat.com/2015/03/24/michael-mann-and-stefan-rahmstorf-claim-the-gulf-stream-is-slowing-due-to-greenland-ice-melt-except-reality-says-otherwise/

Quote:
From your “Day after Tomorrow” department (where a slowing Gulf Stream turned NYC into an icebox) comes this claim from the bowels of Mannian Science. Unfortunately, it looks to be of the caliber of Mann’s Hockey Schtick science.
day-after-tomorrow

As WUWT reported on a peer reviewed paper last year, H. Thomas Rossby says: URI oceanographer refutes claims that climate change is slowing pace of Gulf Stream saying in a paper published in Geophysical Research Letters:



“The ADCP measures currents at very high accuracy, and so through the repeat measurements we take year after year, we have a very powerful tool by which to monitor the strength of the current,” said Rossby. “There are variations of the current over time that are natural — and yes, we need to understand these better — but we find absolutely no evidence that suggests that the Gulf Stream is slowing down.”


Now do a quick Google Scholar search for both Rossby and Rahmstorf. Note the papers both have written and the number of citations for each. You will notice single digit citations, if at all, for the papers written by Rossby and double or triple digit citations for Rahmstorf. This means other researchers have referenced that work in their papers, which means they have a level of confidence in the particular work. Since there are high numbers of cites for more papers for one author over the other, the overall quality of the work of one over the other is indicated by the opinions of other experts. I referenced that higher quality author and you referenced a blog with a reference to the lower quality author.

Author:  Wayne Stollings [ Tue Mar 24, 2015 7:14 pm ]
Post subject:  Re: Global warming slowing ocean circulation

http://pubs.usgs.gov/tm/3a22/pdf/tm3a22_lowres.pdf

It seems the Acoustic Doppler Current Profilers (ADCP) have issues if there are variations in salinity and or temperature in addition to the normal problems with the changes in the speed of sound at depth. I suppose that "very high accuracy" allows for a +7% variation as indicated is the range of accuracy for this type of sensor.

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