Numerical simulation of Eurasian teleconnection pattern in atmospheric circulation during the Northern Hemisphere winter

Gambo, K.; Li, Lü; Li, Weijing

doi:10.1007/bf02656739

Cited by 15 publications

(11 citation statements)

References 7 publications

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“…However, when the February EAT displays a positive anomaly, positive SST anomalies in midlatitude areas of the North Atlantic can be traced back to the preceding January and persist into the following April, and the simultaneous correlation coefficient between the NAMA and EAT reaches 0.47 (exceeding the 99% confidence level) (Figure b). This result denotes the possible influence of the NAMA on EAT in February, which is similar with previous results that the Eurasia (EU) teleconnection pattern [ Wallace and Gutzler , ; Gong et al ., ] is forced by central North Atlantic SST in the winter [ Gambo et al ., ; Liu et al ., ; Qiao et al ., ].…”

Section: The Mechanisms Of the December Nao Affecting The Following Fmentioning

confidence: 98%

Impact of the December North Atlantic Oscillation on the following February East Asian trough

Qiao

Feng

2016

J. Geophys. Res. Atmos.

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During winter, the December North Atlantic Oscillation (NAO) has an impact on the following February East Asian trough (EAT), and a significant positive correlation exists between them. It is shown that the circulation anomalies affected by the December NAO for December and for the following January are primarily confined to the Euro‐Atlantic sector while they extend to East Asia during the following February, and this is related to anomalous wave trains originating from the southwestern Atlantic and spreading to the northeastern Atlantic, northern Europe, western Siberia, and East Asia. When the NAO is positive phase in December, the sea surface temperature (SST) tripole pattern is forced by persistence positive NAO from December to the following January, contributing to pronounced positive SST anomalies in midlatitude areas of the North Atlantic during the following February. The pronounced positive SST anomalies found during this period can generate feedback for atmospheric anomalies, and the westerly winds are enhanced (reduced) to the north (south) side of the positive SST anomalies, which result from strengthened (weakened) baroclinicity there. In addition, the Rossby wave source over the northeastern Atlantic shows a positive anomaly, establishing a link between the positive SST anomalies in midlatitude areas of the North Atlantic and the deepened EAT downstream.

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Section: The Mechanisms Of the December Nao Affecting The Following Fmentioning

confidence: 98%

Impact of the December North Atlantic Oscillation on the following February East Asian trough

Qiao

Feng

2016

J. Geophys. Res. Atmos.

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“…Sun et al (2009) suggested that the troposphere atmospheric circulation anomalies over mid-high latitudes play a crucial role in a strong snowstorm over NEC during 3-5 March 2007. They found persistent anomalies in the Arctic Oscillation (Thompson and Wallace 1998;Gong et al 2001), the North Pacific Oscillation (Wallace and Gutzler 1981), and the Eurasian teleconnection pattern (Gambo et al 1987) before the snowstorm. Besides the mid-high latitude effect, Qin and Jin (2008) indicated a significant role of the northeastward moving vortex that originated from Southwest China in NEC snowstorms.…”

Section: Introductionmentioning

confidence: 99%

An exceptionally heavy snowfall in Northeast china: large-scale circulation anomalies and hindcast of the NCAR WRF model

Wang

Yang³

2011

Meteorol Atmos Phys

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In Northeast China (NEC), snowfalls usually occur during winter and early spring, from mid-October to late March, and strong snowfalls rarely occur in middle spring. During 12-13 April 2010, an exceptionally strong snowfall occurred in NEC, with 26.8 mm of accumulated water-equivalent snow over Harbin, the capital of the most eastern province in NEC. In this study, the major features of the snowfall and associated large-scale circulation and the predictability of the snowfall are analyzed using both observations and models. The Siberia High intensified and shifted southeastward from 10 days before the snowfall, resulting in intensifying the low-pressure system over NEC and strengthening the East Asian Trough during 12-13 April. Therefore, large convergence of water vapor and strong rising motion appeared over eastern NEC, resulting in heavy snowfall. Hindcast experiments were carried out using the NCAR Weather Research and Forecasting (WRF) model in a two-way nesting approach, forced by NCEP Global Forecast System data sets. Many observed features including the large-scale and regional circulation anomalies and snowfall amount can be reproduced reasonably well, suggesting the feasibility of the WRF model in forecasting extreme weather events over NEC. A quantitative analysis also shows that the nested NEC domain simulation is even better than mother domain simulation in simulating the snowfall amount and spatial distribution, and that both simulations are more skillful than the NCEP Global Forecast System output. The forecast result from the nested forecast system is very promising for an operational purpose.

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“…conducive to the negative phase of EU (Figure 9d) [Gambo et al, 1987;Frankignoul et al, 2003]. It should be noted that both significant warm and cold anomalies can be observed in the subtropical Atlantic Ocean during the configuration of "EU − PNA − " (Figure 9c), indicating that the SST anomalies here play a minor role in the formation of the negative phase of the EU.…”

Section: The Possible Roles Of Sst Anomalies On the Large-scale Modesmentioning

confidence: 81%

“…The circulation pattern of the EU is characterized by five centers of activity, i.e., three cyclonic anomalies over the subtropical Atlantic Ocean, the Scandinavian Peninsula, and Japan, and two anticyclonic anomalies over the central North Atlantic Ocean and western Siberia. Cold SST anomalies over the subtropical Atlantic Ocean (south of 30°N) are conducive to a cyclonic anomaly aloft and further enhance the positive phase of EU (Figures a and b), while warm SST anomalies over the same region are conducive to the negative phase of EU (Figure d) [ Gambo et al , ; Frankignoul et al , ]. It should be noted that both significant warm and cold anomalies can be observed in the subtropical Atlantic Ocean during the configuration of “EU − PNA − ” (Figure c), indicating that the SST anomalies here play a minor role in the formation of the negative phase of the EU.…”

Section: Linkages To Large‐scale Modesmentioning

confidence: 99%

On the cooccurrence of wintertime temperature anomalies over eastern Asia and eastern North America

et al. 2017

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The cooccurrence of wintertime temperature anomalies over eastern Asia and eastern North America is examined. The winter days during 1948–2014 are assigned to nine regimes by applying the self‐organizing map clustering method to the area‐averaged land surface temperature anomalies over these two regions. About half of the winter days are associated with concurrent temperature anomalies. The occurrence of the concurrent/nonconcurrent regimes is closely related to the large‐scale circulation conditions. The Eurasian teleconnection pattern and the Pacific‐North American teleconnection pattern are two dominant large‐scale circulation modes associated with the cooccurrence of the temperature anomalies, through their impacts on the intensities of the corresponding troughs. The precursor analysis reveals that the lead time of the early signals for the concurrent cold anomalies is about 4 days longer than that for the concurrent warm anomalies. In addition, the average lead time of the precursor signals for the wintertime temperature anomalies over eastern Asia is longer than that over eastern North America.

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Numerical simulation of Eurasian teleconnection pattern in atmospheric circulation during the Northern Hemisphere winter

Cited by 15 publications

References 7 publications

Impact of the December North Atlantic Oscillation on the following February East Asian trough

Impact of the December North Atlantic Oscillation on the following February East Asian trough

An exceptionally heavy snowfall in Northeast china: large-scale circulation anomalies and hindcast of the NCAR WRF model

On the cooccurrence of wintertime temperature anomalies over eastern Asia and eastern North America

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