scholarly journals Further inquiry into the interaction between the winter North Pacific storm track and the East Asian trough

2020 ◽  
Vol 55 (3-4) ◽  
pp. 471-483
Author(s):  
Minghao Yang ◽  
Chongyin Li ◽  
Yanke Tan ◽  
Xin Li ◽  
Xiong Chen ◽  
...  
Keyword(s):  
North Pacific ◽  
East Asian ◽  
Storm Track ◽  
East Asian Trough ◽  
North Pacific Storm Track

scholarly journals Correction to: Further inquiry into the interaction between the winter North Pacific storm track and the East Asian trough

2020 ◽  
Vol 55 (3-4) ◽  
pp. 485-486
Author(s):  
Minghao Yang ◽  
Chongyin Li ◽  
Yanke Tan ◽  
Xin Li ◽  
Xiong Chen ◽  
...  
Keyword(s):  
North Pacific ◽  
East Asian ◽  
Storm Track ◽  
East Asian Trough ◽  
North Pacific Storm Track

Interdecadal change in the relationship between the winter North Pacific storm track and the East Asian winter monsoon

2021 ◽  
pp. 1-57
Author(s):  
Minghao Yang ◽  
Chongyin Li ◽  
Xin Li ◽  
Yanke Tan ◽  
Xiong Chen ◽  
...  
Keyword(s):  
Atmospheric Circulation ◽  
North Pacific ◽  
East Asian Winter Monsoon ◽  
East Asian ◽  
Storm Track ◽  
Winter Monsoon ◽  
Interdecadal Change ◽  
Asian Winter Monsoon ◽  
The Relationship ◽  
North Pacific Storm Track

AbstractBased on the daily NCEP reanalysis, the present study investigates the interdecadal change in the relationship between the winter North Pacific storm track (WNPST) and the East Asian winter monsoon (EAWM), and evaluates the WNPST-EAWM relationship in 17 CMIP6 models. The results show that the out-of-phase WNPST-EAWM relationship underwent an interdecadal change in the mid-1980s. The WNPST-EAWM relationship became less significant during P2 (1990-2015). The atmospheric circulation anomaly related to the EAWM during P1 (1955-1980) is more robust than that during P2. The interdecadal weakening WNPST-EAWM relationship may be attributed to the interdecadal damping WNPST-EAWM interaction. The EAWM-related anomalous baroclinic energy conversion and moisture effect, including meridional and vertical eddy moisture fluxes, contribute to the significant attenuation of the WNPST during P1. The transient eddy-induced dynamic forcing and thermal forcing anomalies, as well as the barotropic process represented by the local Eliassen-Palm flux divergence associated with WNPST, can also significantly manipulate the upper-tropospheric jet during P1. However, the atmospheric circulation and interaction between the WNPST and EAWM during P2 are not as significant as those during P1. The effect of ENSO on the WNPST is significantly different before and after the mid-1980s. After the mid-1980s, the WNPST shows the characteristic of moving equatorward during El Niño events. It seems that ENSO takes over the WNPST from the EAWM after the mid-1980s. In addition, except for BCC-ESM1, CanESM5 and SAM0-UNICON, most of the CMIP6 models cannot reproduce the significant out-of-phase WNPST-EAWM relationship.

Association of the Zonal Migration of North Pacific Storm Track With the East Asian Monsoon in Boreal Wintertime

2021 ◽  
Vol 126 (4) ◽  
Author(s):  
Minghao Yang ◽  
Chongyin Li ◽  
Xin Li ◽  
Yanke Tan ◽  
Yue Wu ◽  
...  
Keyword(s):  
North Pacific ◽  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Storm Track ◽  
North Pacific Storm Track

scholarly journals The asymmetric eddy-background flow interaction in the North Pacific storm track

2020 ◽  
Author(s):  
Yuan-Bing Zhao
Keyword(s):  
Energy Transfer ◽  
North Pacific ◽  
Storm Track ◽  
Middle Level ◽  
Background Flow ◽  
The North ◽  
Flow Interaction ◽  
The North Pacific ◽  
North Pacific Storm Track ◽  
Canonical Transfer

<p>Using a recently developed methodology, namely, the multiscale window transform (MWT), and the MWT-based theory of canonical transfer and localized multiscale energetics analysis, we investigate in an eddy-following way the nonlinear eddy-background flow interaction in the North Pacific storm track, based on the ERA40 reanalysis data from ECWMF. It is found that more than 50% of the storms occur on the northern flank of the jet stream, about 40% are around the jet center, and very few (less than 5%) happen on the southern flank. For storms near or to the north of the jet center, their interaction with the background flow is asymmetric in latitude. In higher latitudes, strong downscale canonical available potential energy transfer happens, especially in the middle troposphere, which reduces the background baroclinicity and decelerates the jet; in lower latitudes, upscale canonical kinetic energy transfer intensifies at the jet center, accelerating the jet and enhancing the middle-level baroclinicity. The resultant effect is that the jet strengthens but narrows, leading to an anomalous dipolar pattern in the fields of background wind and baroclinicity. For the storms on the southern side of the jet, the baroclinic canonical transfer is rather weak. On average, the local interaction begins from about 3 days before a storm arrives at the site of observation, achieves its maximum as the storm arrives, and then weakens.</p>

scholarly journals Intraseasonal Variation of the Strength of the East Asian Trough and Its Climatic Impacts in Boreal Winter

2016 ◽  
Vol 29 (7) ◽  
pp. 2557-2577 ◽  
Author(s):  
Lei Song ◽  
Lin Wang ◽  
Wen Chen ◽  
Yang Zhang
Keyword(s):  
East Asia ◽  
East Asian ◽  
Quantitative Description ◽  
Storm Track ◽  
Northern Eurasia ◽  
Boreal Winter ◽  
Near Surface ◽  
East Asian Trough ◽  
Climatic Impacts

Abstract The East Asian trough (EAT) is a distinct component of the boreal winter circulation whose strength corresponds to the amplitude of the Northern Hemispheric stationary waves. In this study, the mechanism and climatic impacts of the intraseasonal variations of the EAT’s strength are investigated through composite analysis and dynamical diagnostics. The significant roles played by the low-frequency Rossby wave (RW) and synoptic transient eddy (TE) are revealed. Before the peaks of strong EAT events, an upper-tropospheric RW train propagates across northern Eurasia and interacts with preexisting surface cold anomalies over central Siberia. This pattern intensifies the Siberian high and causes RW convergence toward the EAT, leading to 30% of the EAT’s amplification directly via the RW-induced feedback forcing. Meanwhile, RW weakens the background baroclinicity and reduces TE activities near the entrance region of the North Pacific storm track. The TE-induced feedback forcing leads to another 30% of the EAT’s amplification. The evolution and dynamical processes of the weak EAT events generally resemble those of the strong events with opposite signs. These results are consistent with the knowledge on the mechanism of the strong and weak EAT events regarding the role of RWs with additional quantitative description and provide new insights regarding the role of TEs. Variations of the EAT’s strength exert significant climatic impacts on East Asia and its downstream region. Near-surface air temperature is below (above) normal over East Asia during the growth and peak stages of the strong (weak) EAT events and above (below) normal over North America afterward.

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