EGU22-1126
https://doi.org/10.5194/egusphere-egu22-1126
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Enhanced jet stream waviness induced by suppressed tropical Pacific convection during boreal summer

Qinghua Ding1, Xiaoting Sun1, Shih-Yu Simon Wang2, Dániel Topál3, Qingquan Li4, Christopher Castro5, Haiyan Teng6, Rui Luo1, and Yihui Ding6
Qinghua Ding et al.
  • 1University of California Santa Barbara, Santa Barbara, United States of America (qinghua@geog.ucsb.edu)
  • 2Utah State University
  • 3Research Centre for Astronomy and Earth Sciences
  • 4China Meteorological Administration
  • 5The University of Arizona
  • 6Pacific Northwest National Laboratory

Consensus on the cause of recent midlatitude circulation changes toward a wavier manner in the Northern Hemisphere has not been reached, albeit a number of studies collectively suggest that this phenomenon is driven by global warming and associated Arctic amplification. Here, through a fingerprint analysis of various global simulations and a tropical heating-imposed experiment, we suggest that the suppression of tropical convection along the Inter Tropical Convergence Zone induced by sea surface temperature (SST) cooling trends over the tropical Eastern Pacific contributed to the increased summertime midlatitude waviness in the past 40 years through the generation of a Rossby-wave-train propagating within the jet waveguide and the reduced north-south temperature gradient. This perspective indicates less of an influence from the Arctic amplification on the observed mid-latitude wave amplification than what was previously estimated. This study also emphasizes the need to better predict the tropical Pacific SST variability in order to project the summer jet waviness and consequent weather extremities.

How to cite: Ding, Q., Sun, X., Wang, S.-Y. S., Topál, D., Li, Q., Castro, C., Teng, H., Luo, R., and Ding, Y.: Enhanced jet stream waviness induced by suppressed tropical Pacific convection during boreal summer, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-1126, https://doi.org/10.5194/egusphere-egu22-1126, 2022.

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