Graphical Abstract

• Tweet

Maeda, S., K. Takemura, and C. Kobayashi, 2021: Planetary wave modulations associated with the Eurasian teleconnection pattern. J. Meteor. Soc. Japan, 99, 449-458.
https://doi.org/10.2151/jmsj.2021-022 Graphical Abstract Published

Plain Language Summary: This study analyzes the modulation of planetary waves associated with the Eurasian pattern through composite analyses to reveal its dynamic mechanism, including wave-mean flow interaction. In the positive phase of the Eurasian pattern (EU+), corresponding to the enhanced Asian monsoon, the upward and eastward propagation of the planetary wave from the Central Eurasia to the North Pacific in the troposphere is enhanced. The enhanced upward and eastward propagating planetary wave converges in the upper troposphere, thereby causing anomalous extratropical direct circulation and cold outflow toward the mid-latitude lower troposphere.

• Original PDF

Highlights:

• In the EU+, the upward and eastward propagation of the planetary wave from the Central Eurasia to the North Pacific in the troposphere is enhanced.
• The baroclinic energy conversion from the zonal mean to the deviation from that over East Asia contributes to the amplified planetary wave.
• The enhanced upward and eastward propagating planetary wave converges in the upper troposphere, thereby causing anomalous extratropical direct circulation.