tag:blogger.com,1999:blog-2220966763638300672.post5372165852222899756..comments2023-07-29T05:11:23.558-04:00Comments on Climate Observations: Atlantic Meridional Overturning Circulation DataBob Tisdalehttp://www.blogger.com/profile/15462377647970214137noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-2220966763638300672.post-14916751521226883652009-07-08T03:24:19.297-04:002009-07-08T03:24:19.297-04:00Thanks for that, Bob. It's been quite a concer...Thanks for that, Bob. It's been quite a concern here in the UK.<br /><br />I have updated my web article on the effects of global warming, intended for SF writers and other laypeople like myself: http://www.quarry.nildram.co.uk/Global%20warming.htmAnthony G Williamshttps://www.blogger.com/profile/00798830903236765181noreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-34709318022019824022009-07-07T04:01:42.049-04:002009-07-07T04:01:42.049-04:00Anthony: The catastrophic predictions were based ...Anthony: The catastrophic predictions were based on a study that was incomplete. The 2005 study showed a slowdown in AMOC between 1957 and 2004. Basically, they determined the flow in 1957 and 2004 and found the flow was slower in 2004:<br />http://www.nature.com/nature/journal/v438/n7068/abs/nature04385.html<br /><br />A more complete study in 2007 showed that the slowdown was part of a normal (annual?) cycle of flow rates:<br />http://www.sciencemag.org/cgi/content/abstract/317/5840/935Bob Tisdalehttps://www.blogger.com/profile/15462377647970214137noreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-17436078604945031002009-07-07T03:31:57.944-04:002009-07-07T03:31:57.944-04:00Sorry to come late to this one, but I'm trying...Sorry to come late to this one, but I'm trying to find the answer to a question. I am not a scientist but take a layman's interest in climate change issues. <br /><br />Up to a year or two ago the great concern in NW Europe was that the fresh water released by melting ice in the N Atlantic would block the northerly flow of warm water which keeps temperatures (especially in winter) much warmer than they otherwise would be. The fear was that this could happen quite quickly (over a period of years) and have a rapid chilling effect on the climate which would completely swamp the global warming effect. It was stated that the volume of water moving north had already reduced by about 30% since the 1970s.<br /><br />Now all of a sudden this concern seems to have gone away, and I never hear it being mentioned any more. What happened to change opinions?Anthony G Williamshttps://www.blogger.com/profile/00798830903236765181noreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-59068490992066370282008-12-17T03:35:00.000-05:002008-12-17T03:35:00.000-05:00Carl: I really can't answer your question. I'm n...Carl: I really can't answer your question. I'm not a subscriber to Nature so I don't have access to the full article. I'd want to see how they present the variance in MOC.<BR/><BR/>Regards.Bob Tisdalehttps://www.blogger.com/profile/15462377647970214137noreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-87894416288478081282008-12-17T02:26:00.000-05:002008-12-17T02:26:00.000-05:00Is the apparent long-term response to the '97 El N...Is the apparent long-term response to the '97 El Nino exhibited by the AMOC in your graph what is refered to here:<BR/>http://www.nature.com/news/2008/081129/full/news.2008.1262.html ?<BR/><BR/>If so, they need to be pointed to the relationship with ENSO.<BR/><BR/>CarlAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-17944723221779557822008-11-24T16:01:00.000-05:002008-11-24T16:01:00.000-05:00Carl: On decadal scales, an increase in North Atla...Carl: On decadal scales, an increase in North Atlantic SST should result in an increase in AMOC flow rate, and vice versa. Refer to:<BR/>http://www.ifm-geomar.de/fileadmin/ifm-geomar/allgemein/avillwock/jb_pdfs/chapter3_2_decvar.pdf<BR/>It's not an overly scientific paper but it does a reasonable job. If the link doesn't go though, it's the second pdf when you Google "Atlantic THC SST". <BR/>The title: 3.2 Dynamics and Predictability of North Atlantic / European Climate Variability. It's from the IFM - GEOMAR Report 2002-2004.<BR/><BR/>And yes, you're right. The AMO is a residual, not an SST, so I should've used North Atlantic SST for the comparison, not the AMO in Figure 3. But my primary objective was to show the relationship with ENSO.<BR/><BR/>The thing to recall about this AMOC data set is that it is not a sensed flow rate; it’s a computer reconstruction. Does that make it wrong? No. It also doesn't make it right. Refer to the link at the start of the thread. The authors discuss the data pretty well in the summary, but they miss the link to ENSO.<BR/><BR/>Regards.Bob Tisdalehttps://www.blogger.com/profile/15462377647970214137noreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-65251899683221913822008-11-24T13:37:00.000-05:002008-11-24T13:37:00.000-05:00It's interesting that the circulation data correla...It's interesting that the circulation data correlates to Pacific Nino/Nina variability and not Atlantic Nino/Nina. It also looks like the 96/97 El Nino had a long-term effect on circulation in the N Atlantic. How would we expect the Atlantic Meridional Overturning Circulation to effect SST in the N Atlantic? How does the circulation effect the AMO?Anonymousnoreply@blogger.com