tag:blogger.com,1999:blog-2220966763638300672.post2206985324385731296..comments2023-07-29T05:11:23.558-04:00Comments on Climate Observations: Mid-August 2010 SST Anomaly UpdateBob Tisdalehttp://www.blogger.com/profile/15462377647970214137noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-2220966763638300672.post-37173409472985842212010-08-26T09:48:55.431-04:002010-08-26T09:48:55.431-04:00YFNWG: Assuming you're talking about the week...YFNWG: Assuming you're talking about the weekly global SST anomalies, the 2010 peak ran 0.05 deg C short of 1998. <br /><br />And here's a look at the monthly data:<br />http://i33.tinypic.com/5b1cb6.jpg<br />2010 peaked 0.04 deg C less than 1998.Bob Tisdalehttps://www.blogger.com/profile/15462377647970214137noreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-40126561317083814972010-08-25T22:33:17.214-04:002010-08-25T22:33:17.214-04:00Eyeballing it, it seems 2010 seems a fairly good m...Eyeballing it, it seems 2010 seems a fairly good match to 1998.YFNWGhttps://www.blogger.com/profile/11300086104463119000noreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-25753902361118816572010-08-24T07:37:11.141-04:002010-08-24T07:37:11.141-04:00John: First, an answer to your question: I have ...John: First, an answer to your question: I have no idea what's causing the delay in the response outside of the tropical Pacific. <br /><br />Second, a clarification: Oceans remote to the tropical Pacific warm and cool during El Nino and La Nina events due primarily to changes in atmospheric circulation. Here's a comment I made at Lucia's yesterday that helps detail that. <br /><br />&&&&&&&<br />Are SST anomalies in areas remote to the tropical Pacific, such as the tropical Atlantic, being warmed by the heat released into the atmosphere by the El Niño?<br /><br />Wang provides a very detailed description in his “ENSO, ATLANTIC CLIMATE VARIABILITY, AND THE WALKER AND HADLEY CIRCULATIONS” (2005).<br />http://www.aoml.noaa.gov/phod/docs/Wang_Hadley_Camera.pdf<br /><br />There’s a brief (and not too technical) summary of the causes for the rise in tropical Atlantic SST anomalies in response to an El Niño on page 24. He writes about the tropical North Atlantic [TNA], “The anomalous subtropical ascending motion corresponds to a late winter weakening of the North Atlantic anticyclone and the associated northeast (NE) trade winds over its southern limb in the TNA region. With the weaker NE trades come reduced evaporation and entrainment (from below the oceanic mixed layer) during late winter and early spring, leading to warmer SST anomalies over the TNA region by late spring and early summer (Enfield and Mayer 1997 and others)… …Thus, the Walker and Hadley circulations can serve as a ‘tropospheric bridge’ for transferring the Pacific El Niño SST anomalies to the Atlantic sector and inducing the TNA SST anomalies just at the time of year when the warm pool is developing.”<br /><br />So SST anomalies can rise in response to an El Niño without the transfer of heat and without a change in forcings. When trade winds decrease in response to an El Niño, SST anomalies increase.Bob Tisdalehttps://www.blogger.com/profile/15462377647970214137noreply@blogger.comtag:blogger.com,1999:blog-2220966763638300672.post-13771133346677291352010-08-23T23:28:10.526-04:002010-08-23T23:28:10.526-04:00Hi Bob -
What would keep the SSTs elevated? Isn&...Hi Bob -<br /><br />What would keep the SSTs elevated? Isn't the normal response a drop that acommpanies the Nina as the cooler waters spread and impact the other oceans?<br /><br />Thanks!<br /><br />-JohnJohnnoreply@blogger.com