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14 May 2024
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Stratosphere Sub-Project 14 May, 03:29 2024
23 Dec 2023
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Research to Operations (R2O) and S2S forecast and verification products development 23 Dec, 06:55 2023
20 Jul 2023
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Stratosphere Sub-Project 20 Jul, 03:07 2023
04 May 2023
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Research to Operations (R2O) and S2S forecast and verification products development 04 May, 11:29 2023
29 Oct 2022
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Research to Operations (R2O) and S2S forecast and verification products development 29 Oct, 08:26 2022
25 Oct 2022
20 Oct 2022
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Stratosphere Sub-Project 20 Oct, 21:54 2022
07 Jul 2022
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MJO and Teleconnections 07 Jul, 20:44 2022
26 Apr 2022
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Research to Operations (R2O) and S2S forecast and verification products development 26 Apr, 19:49 2022
15 Apr 2022
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Research to Operations (R2O) and S2S forecast and verification products development 15 Apr, 07:41 2022
08 Apr 2022
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Stratosphere Sub-Project 08 Apr, 04:24 2022
03 Mar 2022
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MJO and Teleconnections 03 Mar, 03:57 2022
Dear Colleagues,
The MJO-Teleconnections webinars are back by popular demand. Please join us for the February webinar hosted by the WWRP/WCRP/S2S/MJO and Teleconnections sub-project.
Title: The Temperature Anomaly Pattern of the Pacific North/American Teleconnection: Growth and Decay
Speaker: Joseph Clark, Princeton University
Date: Thursday, February 24, 2022
Time: 2:00pm EST | 7:00pm UTC
Abstract
The Pacific North/American (PNA) teleconnection pattern has a wide range of weather impacts over the Northern Hemisphere during winter. In this study, we examine the Surface Air Temperature (SAT) anomaly pattern associated with the PNA. Both the positive and negative phases of the PNA generate SAT anomalies over the Russian far east, western North America and eastern North America. However, during the positive PNA phase, there is a significant positive SAT anomaly over Siberia that does not occur during the negative PNA phase. Furthermore, during the negative PNA phase, there is a negative SAT anomaly over the subtropical North Pacific that does not occur during the positive PNA phase. The SAT anomaly over Siberia is shown to be associated with a Eurasian wavetrain that exists preferentially during the positive PNA phase.
We examine the thermodynamic energy equation to determine the relevant physical processes driving each of the SAT anomalies associated with the PNA. The symmetric SAT anomalies (occurring during both PNA phases) that overlie the Russian far east, western North America and eastern North America, grow through horizontal advection of the climatological temperature by the anomalous wind and through downgradient diffusive mixing. The asymmetric SAT anomalies, overlying Siberia during the positive PNA and the subtropical North Pacific during the negative PNA, grow through downgradient diffusive mixing only. For both the symmetric and asymmetric SAT anomalies, downgradient diffusive mixing acts to relocate temperature anomalies from higher in the boundary layer downward to the near surface. In addition, all SAT anomalies decay primarily due to longwave radiation. These results reveal a diversity of processes that contribute to the growth and decay of SAT anomalies within the PNA pattern.
If you would like to attend the webinar, please email to cstan AT gmu DOT edu
Meeting recording:
https://gmu.zoom.us/rec/share/k2O4GiPl33A4T0QmJgHzPilHghktLjeIhEyfAhXvmhwe6H2jKLT57ToNeap9TbWD.I-3zVEaPfEF8OmrL?startTime=1645729562000