EGU21-6506, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-6506
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Accelerated warming in the northern midlatitude summer since the 1990s

Haiyan Teng, Ruby Leung, Grant Branstator, Jian Lu, and Qinghua Ding
Haiyan Teng et al.
  • PNNL, United States of America (haiyan.teng@pnnl.gov)

The northern midlatitude summer has experienced rapid warming since the 1990s, especially in Europe, Central Siberia-Mongolia, the West Coast of North America as well as several continental Arctic regions. These “hot spots” are connected by a chain of high-pressure ridges from an anomalous wavenumber-5 Rossby wave train in the upper troposphere.  Here by cross-examining reanalysis datasets and a suite of Coupled Model Intercomparison Project Phase 6 (CMIP6) baseline experiments, we demonstrate that the anthropogenically forced response may be intertwined with internal multidecadal variability, making it difficult to partition the 1979-2020 trend with state-of-the-art climate models. Instead, we take a “storyline” approach with a planetary wave model and sensitivity experiments with an Earth system model to explore key underlying driving factors. Our results highlight the importance of multiscale interaction with synoptic eddy via atmosphere-ocean and atmosphere-land coupling in shaping the multidecadal regional warming trend which has enormous socioeconomic implications. 

How to cite: Teng, H., Leung, R., Branstator, G., Lu, J., and Ding, Q.: Accelerated warming in the northern midlatitude summer since the 1990s, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-6506, https://doi.org/10.5194/egusphere-egu21-6506, 2021.