the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
The Nonequilbrium Thermodynamics of Atmospheric Blocking
Abstract. Two strong NE Pacific blocking events that occurred nearly one year apart and in the same region are examined here by methods from nonequilbrium thermodynamics. In a nonequilibrium setting, the time variation of entropy is a sum of two parts: the external entropy supply and the internal entropy production. The internal entropy production and external entropy supply (the surface entropy supply) are calculated and compared to recent trends in the region that encompassed both blocking events. The entropy production and entropy surface supply were found to be high during both blocking events. However, the surface conditions during the events were markedly different. The surface conditions during the first event were dominated by the NE Pacific sea surface temperature anomaly known as the Blob, while the other event was less influenced. In particular, the surface entropy supply increased from January to February for the first event. The entropy production decreased slightly but any negative entropy flows from extratropical cyclones were offset by the increasing surface entropy supply, maintaining the blocking event. On the other hand, the second event had no large changes in the surface entropy supply or entropy production during its lifetime even though it was similar to the first event in many respects. The use of entropy as a convenient variable to examine the mechanisms that maintain blocking events is considered.
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RC1: 'Review of 'The nonequilibrium thermodynamics of atmospheric blocking' by A. Jensen', Anonymous Referee #1, 11 Jul 2016
- AC3: 'Reply to reviewer #1', Andrew Jensen, 25 Aug 2016
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SC1: 'The nonequilibrium thermodynamics of atmospheric blocking by A. Jensen', Joe LaCasce, 21 Jul 2016
- EC1: 'reviewer comment', Andreas Stohl, 21 Jul 2016
- AC1: 'Reply to reviewer #2', Andrew Jensen, 25 Aug 2016
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RC2: 'Interactive comment on “The Nonequilbrium Thermodynamics of Atmospheric Blocking”', Thomas Toniazzo, 25 Jul 2016
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AC2: 'Reply to reviewer #3', Andrew Jensen, 25 Aug 2016
- RC3: 'points 4,5', Thomas Toniazzo, 25 Aug 2016
-
AC2: 'Reply to reviewer #3', Andrew Jensen, 25 Aug 2016
-
RC1: 'Review of 'The nonequilibrium thermodynamics of atmospheric blocking' by A. Jensen', Anonymous Referee #1, 11 Jul 2016
- AC3: 'Reply to reviewer #1', Andrew Jensen, 25 Aug 2016
-
SC1: 'The nonequilibrium thermodynamics of atmospheric blocking by A. Jensen', Joe LaCasce, 21 Jul 2016
- EC1: 'reviewer comment', Andreas Stohl, 21 Jul 2016
- AC1: 'Reply to reviewer #2', Andrew Jensen, 25 Aug 2016
-
RC2: 'Interactive comment on “The Nonequilbrium Thermodynamics of Atmospheric Blocking”', Thomas Toniazzo, 25 Jul 2016
-
AC2: 'Reply to reviewer #3', Andrew Jensen, 25 Aug 2016
- RC3: 'points 4,5', Thomas Toniazzo, 25 Aug 2016
-
AC2: 'Reply to reviewer #3', Andrew Jensen, 25 Aug 2016
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