Modulation of the interdecadal variation of atmospheric background flow on the recent recovery of the EAWM during the 2000s and its link with North Atlantic–Arctic warming

Zhang, Ruonan; Zhang, Renhe; Sun, Cheng

doi:10.1007/s00382-022-06152-0

Cited by 6 publications

(5 citation statements)

References 101 publications

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“…Zhang et al (2018) revealed heavy SIC exert a dynamic influence by increasing the meridional temperature gradient in the lower troposphere with stronger (weaker) zonal winds in high‐latitude (midlatitude) areas, which establishes the background conditions for the blocking activity and thus helps to inspire summertime Ural Blocking events. The widespread North Atlantic–Arctic warming can modulate and interact with 300‐hPa zonal flow, which further enhanced the quasi‐stationary Rossby waves along the midlatitude and subpolar wave guides, resulting in a strengthened East Asian Winter Monsoon and cold East Asia (Zhang et al, 2022). These studies support our result that lower BKS SIC favours the stronger Ural blocking and lower Siberian geopotential height.…”

Section: Relationship Between Winter Bks Sic and Wsws In Northwest Chinamentioning

confidence: 99%

Regime shift of the leading mode of winter surface wind speed in northwest China in 2003/04 and its possible link with Barents–Kara sea ice

Wang,

Zhou,

Liu

et al. 2024

Intl Journal of Climatology

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Using the ERA‐5 reanalysis datasets, NCEP/NCAR sea ice concentration (SIC) and observed winter surface wind speed (WSWS) in northwest China during 1979–2020, this study examined the regime shift of the leading mode of observed WSWS in northwest China and investigated its possible link with the winter Barents–Kara Sea (BKS) SIC. The leading mode of observed WSWS in northwest China showed negative anomalies in southern and northeastern Xinjiang, Gansu, western and northern Shaanxi Provinces, and positive anomalies in northwestern and middle Xinjiang, Qinghai and Ningxia Provinces. The signs of WSWS in the leading mode is generally opposite to their trends during 1979–2020. Leading principal component (PC1) of observed WSWS in northwest China underwent an obvious decreasing regime shift in 2003/04, as well as the winter BKS SIC. There are significant correlations between PC1 and BKS SIC on both interdecadal and interannual timescales. Decadal decrease of BKS SIC is accompanied with a positive phase of Scandinavia pattern (SP) with positive anomalies of 500‐hPa geopotential height over subtropical North Atlantic, Arctic‐Ural region and southern Asia, and negative anomalies over northern North Atlantic‐West Europe and Siberia regions. BKS SIC and SP significantly influenced the Northern China Wind Index (NCWI) at 200 hPa on interdecadal timescale, which was related to the PC1 on both interdecadal and interannual timescales after removing the signal of Arctic Oscillation. Meridional configuration of Siberian cyclonic anomaly and southern Asian anticyclonic anomaly associated with the winter BKS SIC could enhance the intensity of NCWI, which favoured the increase of observed WSWS in northwest China and thereby may contribute to the regime shift in 2003/04 of the leading mode. However, there were still some stations showing decreasing regime shift, which mainly located at the region of steeping terrain. These decreasing changes of WSWS may be related to circumfluence effect of terrain, urbanization and local microclimate, and these reasons still need further detailed study.

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Section: Relationship Between Winter Bks Sic and Wsws In Northwest Chinamentioning

confidence: 99%

Regime shift of the leading mode of winter surface wind speed in northwest China in 2003/04 and its possible link with Barents–Kara sea ice

Wang,

Zhou,

Liu

et al. 2024

Intl Journal of Climatology

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“…As the V300-EOF1 mode has been found to primarily impact the winter Eurasian SATs (see Sung et al, 2018;Zhang et al, 2022a), we further explore the possible impact of the V300-EOF2 mode on the Eurasian and North American SATs and the associated tropospheric and stratospheric dynamics. The regression map of the V300-PC2 index on to the SAT anomalies field is shown in Figure 2a, and it is noteworthy that coherent cold anomalies occur over the mid-latitudes of Eurasia and North America, as well as warm anomalies over the North Pacific and western Arctic regions.…”

Section: Observed V300-eof Modes and Their Connection With Tropospher...mentioning

confidence: 99%

“…The upper‐level wind is important for the propagation of Rossby waves (e.g., Karoly & Hoskins, 1982; Sardeshmukh & Hoskins, 1988; Teng & Branstator, 2012; Sung et al, 2018; Chowdary et al, 2019; Zhang et al, 2022a), and Rossby waves may act as conduits for modulating Eurasian and North American circulation. Recent studies have indicated that in association with the winter SAT anomalies over North Asia and the central‐eastern parts of North America, an extratropical atmospheric teleconnection termed the Asian‐Bering‐North American (ABNA) pattern features a zonally elongated wave train that can affect coherent changes in the SATs in North Asia and North America (Yu et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Upper‐level wind mode over the North Atlantic‐Arctic Ocean leading to coherent variations of Eurasian and North American winter temperatures and weakness in the CMIP6 models

Sun,

Shi,

et al. 2023

Intl Journal of Climatology

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This study discovers that the interannual synchronization of winter temperature anomalies between northern Eurasia and North America is closely related to variation in the second leading mode of the 300 hPa meridional wind anomalies (i.e., V300‐EOF2) over the North Atlantic‐Arctic Ocean. The V300‐EOF2 mode modulates the large‐scale Rossby wave propagating across the mid‐high latitudes of the Eurasian and North American continents at the mid‐high level of troposphere, and it also interferes with the climatological quasi‐stationary wavenumber‐2 to affect the stratosphere circulation, which facilitates the southward intrusion of cold air into Eurasia and North America simultaneously. This study also evaluated whether the CMIP6 high‐top (HT) models could more accurately represent the V300‐EOF2 mode and the associated modulation mechanism on synchronized temperature variation between Eurasia and North America than the low‐top (LT) models. The results demonstrate that although the multi‐model ensemble means (MME) of both the HT and LT models can reproduce the V300‐EOF mode, they all underestimate its modulation mechanism on atmospheric circulation and coherent temperature changes over mid‐latitude Eurasia and North America, with minor differences in simulation skill capability. Most importantly, although containing a full stratosphere, the HT models do not significantly improve their simulation ability to depict the observed linear interference between the anomalous wave‐2 and the climatological stationary wave‐2 compared to the LT models. Therefore, comparing to the LT models, the CMIP6 HT models present no clear advantages in reproducing the V300‐EOF2 mode and its associated low‐frequency climate anomalies. These results also have implications for the evaluation of the predictability of concomitant Eurasian‐North American cooling in the Subseasonal‐to‐Seasonal Prediction Project.

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“…Snow is a crucial cryosphere factor in terms of regulating the thermal condition of the TP. Previous research has indicated that snow anomalies over the TP can modulate the thermal condition of the TP through the snow albedo effect and snow hydrologic effect 45 , leading to changes in the upper-level circulations, thus impacting the climate locally and globally 16,[40][41][42][43][44]46 . Furthermore, TP snow can regulate atmospheric circulation variability by coupling with other external forcing factors, such as SST and Arctic sea ice, thus in uencing the broader climate system 44,48,49 .…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, if some trapped planetary waves are close to the quasi-stationary waves excited by thermal or orographic forcing, the QRA will occur 24 . Studies have revealed that greenhouse gas forcing [36][37][38] , sea ice 39 , sea surface temperature (SST) cooling in the East Paci c 28,29 , the El Niño-Southern Oscillation 40,41 and the Atlantic multidecadal oscillation 42,43 may contribute to quasi-stationary planetary wave variations.…”

Section: Introductionmentioning

confidence: 99%

Decreased Western Tibet Snow Cover Amplifies the Increase in Summer Concurrent Compound Heatwaves in the Northern Hemisphere

Jia

Dong²

2023

Preprint

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The occurrence of summer concurrent compound heatwaves (CCHWs) across multiple regions in the Northern Hemisphere (NH) has substantially increased in recent decades, though the contributions made by external forcings remain uncertain. This work has revealed that decreased summer snow cover over the western Tibetan Plateau (SC_WTP) could have significantly amplified the increase in summer CCHWs in the NH during 1979–2021. These findings are supported by both observational data and Coupled Model Intercomparison Project Phase 6 model simulations. The decreased SC_WTP causes diabatic warming by modulating the surface energy budget and stimulates a tripolar Rossby wave source over the TP. The atmospheric response to the SC_WTP forcing-related disturbance generates a circumglobal circulation pattern, which is accompanied by a weakening of the meridional temperature and a “double jet stream” in the NH. These changes modulate the phase, amplitude, and proportion of quasis-tationary waves 6–8, which results in an increase in CCHWs in the NH.

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Modulation of the interdecadal variation of atmospheric background flow on the recent recovery of the EAWM during the 2000s and its link with North Atlantic–Arctic warming

Cited by 6 publications

References 101 publications

Regime shift of the leading mode of winter surface wind speed in northwest China in 2003/04 and its possible link with Barents–Kara sea ice

Regime shift of the leading mode of winter surface wind speed in northwest China in 2003/04 and its possible link with Barents–Kara sea ice

Upper‐level wind mode over the North Atlantic‐Arctic Ocean leading to coherent variations of Eurasian and North American winter temperatures and weakness in the CMIP6 models

Decreased Western Tibet Snow Cover Amplifies the Increase in Summer Concurrent Compound Heatwaves in the Northern Hemisphere

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