Search Results

You are looking at 111 - 120 of 4,549 items for :

  • Arctic Oscillation x
  • All content x
Clear All
Masahiro Watanabe and Fei-Fei Jin

1. Introduction A concept of Arctic Oscillation (AO), or the northern annular mode, proposed by Thompson and Wallace (1998) has recently provided a different view of the low- frequency atmospheric variability from the classic teleconnection. The AO, defined by the leading empirical orthogonal function (EOF) to the Northern Hemisphere sea level pressure (SLP) anomalies, has a hemispheric extent dominated by a zonally uniform structure as shown by the AO-covariant height anomalies ( Fig. 1a

Full access
Hiroyuki Ito, Nathaniel C. Johnson, and Shang-Ping Xie

remote forcing through El Niño–Southern Oscillation (ENSO) and associated Indian Ocean SST variations ( Wu et al. 2009 ; Xie et al. 2009 , 2010 ; Kosaka and Nakamura 2010 ; Chowdary et al. 2011 ; Hu et al. 2011 ; Zhou et al. 2011 ). Also, snowfall over the Tibetan Plateau and the phase of the Arctic Oscillation (AO) in spring leads circulation anomalies over East Asia in summer ( Seol and Hong 2009 ; Zhou el al. 2011 ). Important factors for the summer climate of East Asia are two atmospheric

Full access
Chaoxia Yuan and Wenmao Li

Aleutian low, and the stronger EAWM (e.g., Yang et al. 2002 ; Kuang et al. 2008 ). The Arctic Oscillation (AO; Thompson and Wallace 1998 , 2000 ) is one of the most prominent patterns of the large-scale circulation anomalies in the Northern Hemisphere. In the winter, when the AO is in its negative phase, there are positive sea level pressure (SLP) anomalies in the polar region surrounded by negative ones in the midlatitudes. The weakened polar vortex leads to more southward intrusion of the cold

Full access
Marlene Kretschmer, Dim Coumou, Jonathan F. Donges, and Jakob Runge

1. Introduction The recent cold winters in North America and Eurasia were characterized by a meandering jet stream pattern that allowed cold Arctic air to reach lower latitudes ( Cohen et al. 2014b ). Moreover, these winters were dominated by a negative phase of the Arctic Oscillation index (AO), which is usually associated with pronounced meridional wind patterns, whereas in a positive AO phase strong zonal flow dominates the wind field. Although a negative AO and meandering flow patterns have

Full access
Jiankai Zhang, Fei Xie, Wenshou Tian, Yuanyuan Han, Kequan Zhang, Yulei Qi, Martyn Chipperfield, Wuhu Feng, Jinlong Huang, and Jianchuan Shu

such as the Madden–Julian oscillation (e.g., Fujiwara et al. 1998 ; Tian et al. 2007 ; C. Liu et al. 2009 ; Weare 2010 ; Li et al. 2012 ; Y. Zhang et al. 2015 ), El Niño–Southern Oscillation (ENSO) (e.g., Ziemke and Chandra 1999 ; Cagnazzo et al. 2009 ; Randel et al. 2009 ; Xie et al. 2014a , b ; J. Zhang et al. 2015a , b ), the quasi-biennial oscillation (e.g., Angell and Korshover 1973 ; Bowman 1989 ; Tung and Yang 1994 ; Dhomse 2006; Li and Tung 2014 ), and the Arctic Oscillation

Full access
Miles G. McPhee

870 JOURNAL OF PHYSICAL OCEANOGRAPHY VOLUME I0A Study of Oceanic Boundary-Layer Characteristics Including Inertial Oscillation at Three Drifting Stations in I~he Arctic OceanMILES G. McPnEEu.s. Army Cold Regions Research and Engineering Laboratory, Hanover, NH 05?55(Manuscript received 3 September 1979, in final form 4 February 1980) ABSTRACT Measurements of

Full access
Rasmus A. Pedersen, Ivana Cvijanovic, Peter L. Langen, and Bo M. Vinther

East Asian midlatitudes), it is clear that other regions are sensitive to the location of the sea ice loss. The North Atlantic Oscillation in particular exhibits a high sensitivity. This study, in line with several previous studies, demonstrates a link between the Arctic sea ice cover and the North Atlantic Oscillation. While no clear trend is found in the NAO index, the spatial structure of the NAO pattern appears sensitive to the location of the ice loss. We find that the sea ice loss in the

Full access
Dehai Luo, Yiqing Xiao, Yina Diao, Aiguo Dai, Christian L. E. Franzke, and Ian Simmonds

1. Introduction In Luo et al. (2016 , hereafter Part I ) the regression analysis of the winter (DJF)-mean 500-hPa geopotential height anomalies revealed that the winter sea ice loss over the Barents and Kara Seas (BKS) is associated with the Ural blocking (UB) pattern and the positive North Atlantic Oscillation (NAO + ) and is followed by a winter-mean warm Arctic–cold Eurasian (WACE) temperature pattern, while the overall atmospheric response to arctic sea ice loss resembles a negative

Full access
Sergei Kirillov, Igor Dmitrenko, Bruno Tremblay, Yves Gratton, David Barber, and Søren Rysgaard

Arctic Oscillation and North Pacific index) and related atmospheric pressure patterns (viz., the Beaufort Sea high and the Aleutian low). The long-term and seasonal changes of upwelling-favorable wind occurrence over the Mackenzie slope help us to demonstrate how the probability of upwelling events changes in time. The overall goal of the current study is to demonstrate the linkage between atmospheric wind forcing and changes in the offshore vertical thermohaline structure along the southern Beaufort

Full access
Yong Liu, Huopo Chen, Guoqing Zhang, Jianqi Sun, Hua Li, and Huijun Wang

Arctic sea ice loss plays an important role in the variation in summer precipitation in China ( He et al. 2018 ; Li et al. 2018 ; Shen et al. 2019 ). The reduction in June sea ice over the Barents Sea can trigger a meridional overturning wave-like pattern extending toward the midlatitudes and then resulting in a tripole precipitation pattern over East Asia ( He et al. 2018 ). Li et al. (2018) also suggested that the Barents Sea ice decline in spring, along with the subsequently reduced snow cover

Free access