Rossby Wave Propagation and Teleconnection Patterns in the Austral Winter

Ambrizzi, Tércio; Hoskins, Brian J.; Hsu, Huang‐Hsiung

doi:10.1175/1520-0469(1995)052<3661:rwpatp>2.0.co;2

Cited by 271 publications

(230 citation statements)

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“…The SRW KE method, as suggested by Lighthill (1978), was shown to be useful in the SRW propagation analysis and confirmed, for both hemispheres, the Rossby waveguides found through zonal wind and K s and by Hoskins and Ambrizzi (1993) and Ambrizzi et al (1995). Many changes in SRW, which occurred from the late 1940s to the early 2000s, can be explained by the changes in SRW propagation, as noted in this paper.…”

Section: Summary and Concluding Remarkssupporting

confidence: 77%

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Multidecadal and interannual changes of stationary Rossby waves

Freitas

Rao

2011

Quart J Royal Meteoro Soc

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Changes in stationary Rossby waves (SRW) are connected to regional climate change and the propagation of these waves has a large influence on the evolution and development of the general circulation. Since the late 1970s and early 1980s many studies have noted a major shift in the structure of large-scale circulation occurring in both hemispheres. This paper explores the changes in the SRW pattern and their propagation associated with these climate shifts. First, multidecadal changes in SRW activity are examined, using NCEP-NCAR reanalysis data, for two periods:

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Section: Summary and Concluding Remarkssupporting

confidence: 77%

“…For the SH in JJA we will focus on two main waveguides found by Ambrizzi et al (1995): one, in the AUJ region, having typical stationary total wavenumber 7 (zonal wavenumber 5), and another, in the PJ region, having typical stationary total wavenumber 4 (zonal wavenumber 3-4).…”

Section: Stationary Wavenumbermentioning

confidence: 99%

Multidecadal and interannual changes of stationary Rossby waves

Freitas

Rao

2011

Quart J Royal Meteoro Soc

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“…It is possible that the source for the Naganishia species found in Antarctica is the continuous dispersal of dust and particles from the Southern Andes via meandering Rossby waves in the troposphere (Madden 1979). These waves result from the confluence of the polar and subtropical jet streams which join and separate at periodic intervals (Ambrizzi et al, 1995; James 1988; Polvani and Saravanan 2000) and could drive the aerial dispersal of microbes in both directions between the Andes and Antarctica. Visualisation of Rossby waves can be found online (http://squall.sfsu.edu/crws/archive/jetstream_archive.html).…”

Section: Global Aerial Dispersal Of Naganishia Speciesmentioning

confidence: 99%

ANaganishiain high places: functioning populations or dormant cells from the atmosphere?

et al. 2017

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Here, we review the current state of knowledge concerning high-elevation members of the extremophilic Cryptococcus albidus clade (now classified as the genus Naganishia). These fungi dominate eukaryotic microbial communities across the highest elevation, soil-like material (tephra) on volcanoes such as Llullaillaco, Socompa, and Saírecabur in the Atacama region of Chile, Argentina, and Bolivia. Recent studies indicate that Naganishia species are among the most resistant organisms to UV radiation, and a strain of N. friedmannii from Volcán Llullaillaco is the first organism that is known to grow during the extreme, diurnal freeze-thaw cycles that occur on a continuous basis at elevations above 6000 m.a.s.l. in the Atacama region. These and other extremophilic traits discussed in this review may serve a dual purpose of allowing Naganishia species to survive long-distance transport through the atmosphere and to survive the extreme conditions found at high elevations. Current evidence indicates that there are frequent dispersal events between high-elevation volcanoes of Atacama region and the Dry Valleys of Antarctica via “Rossby Wave” merging of the polar and sub-tropical jet streams. This dispersal hypothesis needs further verification, as does the hypothesis that Naganishia species are flexible “opportunitrophs” that can grow during rare periods of water (from melting snow) and nutrient availability (from Aeolian inputs) in one of the most extreme terrestrial habitats on Earth.

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“…A recent study by Yadav (2016) explained the mechanism connecting tropical Atlantic SSTs and summer monsoon rainfall over northwest and central India through the Eurasian wave. The link between the three entities, namely, Atlantic SST, Eurasian snow and summer monsoon, is manifested through Rossby waves that modulate the Tibetan High thereby influencing rainfall over the northwest and central India (Hoskins and Ambrizzi 1993;Ambrizzi et al 1995). Hahn and Shukla (1976) reinforced the idea first put forward by Walker (Walker 1910) that boreal winters with excessive (less) snow cover over Eurasia tend to be followed by less (more) summer monsoon rainfall over India.…”

Section: Introductionmentioning

confidence: 96%

Summer monsoon rainfall variability over North East regions of India and its association with Eurasian snow, Atlantic Sea Surface temperature and Arctic Oscillation

Prabhu

Kim

et al. 2016

Clim Dyn

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Nepal and Bangladesh, is influenced by local and remote forces. In terms of geographical size, NE-India constitutes of about 8% of India's total size. Its population is approximately 40 million, which represents around 3.1% of the total Indian population. This region has a predominantly humid sub-tropical climate with hot, humid summers, severe monsoons and mild winters. Along with the west coast of India, this region has some of the Indian sub-continent's last remaining rain forests, which supports diverse flora and fauna and several crop species. Geographically, two-thirds of the area is a hilly terrain interspersed with valleys and plains. The mean summer monsoon rainfall over the NE-Indian region is around 1400 mm making for huge water and hydropower potential. However, this region has been exhibiting a declining trend in the summer monsoon rainfall since the last 4-5 decades (see Fig. 3, Fig. 4a in Preethi et al. 2016). Hence, it becomes imperative to examine the possible drivers of this variability.Significance for long-term prediction of summer monsoon, considering its massive socio-economic impacts, have been widely attributed to the slowly varying boundary conditions such as sea surface temperature (SST) and snow cover (Shukla 1998). In general, rainfall distribution pattern over different regions of India is inhomogeneous due to influence of several local and remote factors. For instance, over the central Indian plain region, monsoon trough and the Himalayas along with local and external factors play a dominant role in its interannual rainfall variability. Likewise, the northwest region is influenced by the dry climates of the Thar Desert and the Western Himalayas. Apparently from the geographical features as described above, the rain producing mechanism of NE rainfall is a complex phenomenon and is largely dominated by an elevated orography of the Eastern Himalayas and large forests. The NE sector may be considered as a separate macro-region within the Indian Abstract This observational study during the 29-year period from 1979 to 2007 evaluates the potential role of Eurasian snow in modulating the North East-Indian Summer Monsoon Rainfall with a lead time of almost 6 months. This link is manifested by the changes in high-latitude atmospheric winter snow variability over Eurasia associated with Arctic Oscillation (AO). Excessive wintertime Eurasian snow leads to an anomalous cooling of the overlying atmosphere and is associated with the negative mode of AO, inducing a meridional wave-train descending over the tropical north Atlantic and is associated with cooling of this region. Once the cold anomalies are established over the tropical Atlantic, it persists up to the following summer leading to an anomalous zonal wave-train further inducing a descending branch over NE-India resulting in weak summer monsoon rainfall.

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Rossby Wave Propagation and Teleconnection Patterns in the Austral Winter

Cited by 271 publications

References 0 publications

Multidecadal and interannual changes of stationary Rossby waves

Multidecadal and interannual changes of stationary Rossby waves

ANaganishiain high places: functioning populations or dormant cells from the atmosphere?

Summer monsoon rainfall variability over North East regions of India and its association with Eurasian snow, Atlantic Sea Surface temperature and Arctic Oscillation

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