Near-Global Atmospheric Responses to Observed Springtime Tibetan Plateau Snow Anomalies

Liu, Shizuo; Wu, Qigang; Schroeder, Steven R.; Yao, Yonghong; Zhang, Yang; Wu, Tongwen; Wang, Lei; Hu, Haibo

doi:10.1175/jcli-d-19-0229.1

Cited by 16 publications

(24 citation statements)

References 55 publications

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“…It is worthy to note that the spatial distribution of atmospheric circulation anomalies over the North Pacific in Figures 5A,B shows a North Pacific Oscillation/western Pacific (WP)-like structure. Previous studies have already reported that the TP snow cover anomalies can lead to a WP-like response (e.g., Wang Z. et al, 2017;Liu et al, 2020). Why did the ONDJ TP snow forcing trigger a winter PNA response in 1979-1998 but a WP response in 1999-2016?…”

Section: Discussionmentioning

confidence: 95%

“…Wang et al (2020) detected that the impact of the TP snow cover on the North America SAT in spring experienced a weakening in the mid-2000s. In addition, observational and numerical studies suggest that the TP snow anomaly can trigger near-global atmospheric circulation patterns, such as the Pacific-North American (PNA)-like teleconnection (e.g., Lin and Wu 2011;Wu et al, 2011;Liu et al, 2017) and the Western Pacific-like teleconnection (e.g., Liu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Impact of Autumn-Winter Tibetan Plateau Snow Cover Anomalies on the East Asian Winter Monsoon and Its Interdecadal Change

Chen

Wang

2021

Front. Earth Sci.

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The present study investigates the impacts of autumn-winter Tibetan Plateau (TP) snow cover anomalies on the interannual variability of the East Asian winter monsoon (EAWM). It is found that the northern component of EAWM is significantly associated with October-November-December-January (ONDJ) snow cover anomalies over the eastern TP, whereas the TP snow cover changes have little impact on the southern component of EAWM. However, the relationship of the northern component of EAWM to ONDJ TP snow cover experienced an obvious change in the mid-1990s. During 1979–1998, due to the high persistence of TP snow anomalies from autumn to winter, extensive ONDJ TP snow cover anomalies have a prominent influence on atmospheric circulation over Asia and the North Pacific, with more TP snow cover followed by an enhanced Siberian high and a deepened Aleutian low in winter, resulting in stronger EAWM. During 1999–2016, TP snow cover anomalies have a weak persistence. The atmospheric circulation anomalies display a different distribution. As such, there is a weak connection between the northern component of EAWM and the TP snow cover anomalies during this period.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Impact of Autumn-Winter Tibetan Plateau Snow Cover Anomalies on the East Asian Winter Monsoon and Its Interdecadal Change

Chen

Wang

2021

Front. Earth Sci.

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“…Moreover, the thermal forcing of the TP, which may be related to local SAT anomalies, in turn, exert important influences on SSTAs in some areas of the Pacific and Indian Oceans [51][52][53]. The TP thermal anomaly may result in an asymmetrical response of the East Asian summer monsoon to the quadrennial oscillation of global SSTAs through the TP thermal feedback [54]. That is, the prediction of the summer eastern TP SAT involves complex air-sea interaction processes.…”

Section: Summary and Discussionmentioning

confidence: 99%

Precursory Signals (SST and Soil Moisture) of Summer Surface Temperature Anomalies over the Tibetan Plateau

et al. 2021

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Understanding the variability of surface air temperature (SAT) over the Tibetan Plateau (TP) and its precursory signals is of great benefit to climate change adaptation and socioeconomic development. This study explores the precursory signals of summer SATs over the TP in oceanic and land boundary conditions. The results show that the summer eastern TP SAT is significantly correlated with three precursors in April: the high-latitude North Atlantic sea surface temperature (SST), the northern Indian Ocean SST, and the Indian soil moisture (SM). The April SST anomalies (SSTAs) in the high-latitude North Atlantic can exert a cross-season impact on the summer SAT over the TP through two processes. The SSTAs in the high-latitude North Atlantic maintain from April to summer and modulate atmospheric circulation over the eastern TP through exciting a downstream wave train during summer, and finally modulate the summer SAT over the eastern TP. In addition to the above process, the April SSTAs in the high-latitude North Atlantic may remotely regulate simultaneous SM in the Indian subcontinent through stimulating a downstream wave train pattern. Through a persistent SM–precipitation interaction, the April Indian SM anomaly can affect the local precipitation and associated condensation heating anomalies during the ensuing summer, which forces an anomalous cyclone–anticyclone pattern around the TP and accordingly affects the summer SAT over the eastern TP. Additionally, the SSTAs in the northern Indian Ocean can persist from April to summer and adjust the intensity and location of the western North Pacific subtropical high through the Kelvin-wave-induced Ekman divergence during summer, eventually affecting the summer eastern TP SAT. The three precursory signals, which synergistically contribute to the variability of the summer eastern TP SAT, can be applied in predicting the summer SAT over the eastern TP.

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“…Empirical orthogonal function (EOF) analysis is used to capture the spatiotemporal variations of the CGT instead of the one-point correlation. The first two dominant related modes between diabatic heating over the TP and the surrounding area and H200 are detected by the SVD method (Bretherton et al 1992;Liu et al 2020a;Wallace et al 1992). Linear regression and composite analysis are conducted to obtain the circulation patterns related to the diabatic heating over the TP, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Robust connections have been found between the atmospheric circulation and the variability in snow cover on the TP (Song et al 2019;Zhao et al 2007;Wu et al 2014a, b). Autumn-spring snow cover over the eastern TP can affect North American temperature by largescale atmospheric wave pattern, a Pacific-North America (PNA)-like downstream atmospheric response, and a western Pacific-like teleconnection pattern is excited by anomalies in the autumn snow cover (Lin and Wu 2011;Liu et al 2017Liu et al , 2020aMote and Kutney 2012;Qian et al 2019;Wang et al 2020;Wu et al 2011). The decrease in summertime snow cover can trigger a zonal wave train over Eurasia and influence 30% of the total variance in summer heat waves in southern Europe (Wu et al 2016c).…”

Section: Introductionmentioning

confidence: 99%

A zonally-oriented teleconnection pattern induced by heating of the western Tibetan Plateau in boreal summer

Zhao

Yang

et al. 2021

Clim Dyn

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The thermal effect of the Tibetan Plateau (TP) on the northern hemisphere climate has long been a hot topic of scientific research. However, the global effects of the TP heat source are still unclear. We investigate the teleconnection patterns coincident with the TP heat source in boreal summer using both observational data and numerical models including a linearized baroclinic model and an atmospheric general circulation model. The western TP shows the most intense variability in atmospheric heating and the most active connection to atmospheric circulations. The surface sensible heating component of the western TP heat source is associated with a high-latitude wave train propagating from North Japan to central North America through the Bering Sea and Canada. The radiative heating component is accompanied by a wavenumber-4 wave train over Eurasia. We focus on the global zonally-oriented pattern that is connected with the latent heat release from the western TP, referred to here as the TP–circumglobal teleconnection (TP-CGT). The TP-CGT pattern is triggered by the western TP latent heating in two parts starting from the TP: an eastward-propagating wave train trapped in the westerly jet stream and a westward Rossby wave response. The TP-CGT accounts for above 18% of the total variance of the circumglobal teleconnection pattern and modulates mid-latitude precipitation by superimposition. The western TP is the key region in which diabatic heating can initiate the two atmospheric responses concurrently, and the heating over northeastern Asia or the Indian Peninsula is unable to induce the circumglobal pattern directly. The unique geographical location and strong tropospheric heating also make the western TP as a “transit area” of transferring the indirect impact of the Indian summer monsoon (ISM) to the TP-CGT. These results enhance our understanding of the relationship between the circumglobal teleconnection and the ISM and is helpful for improving the prediction of the circumglobal teleconnection variability.

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Near-Global Atmospheric Responses to Observed Springtime Tibetan Plateau Snow Anomalies

Cited by 16 publications

References 55 publications

Impact of Autumn-Winter Tibetan Plateau Snow Cover Anomalies on the East Asian Winter Monsoon and Its Interdecadal Change

Impact of Autumn-Winter Tibetan Plateau Snow Cover Anomalies on the East Asian Winter Monsoon and Its Interdecadal Change

Precursory Signals (SST and Soil Moisture) of Summer Surface Temperature Anomalies over the Tibetan Plateau

A zonally-oriented teleconnection pattern induced by heating of the western Tibetan Plateau in boreal summer

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