Interannual Variability of the January Tropospheric Meridional Eddy Sensible Heat Transport in the Northern Latitudes

Higuchi, Kaz; Lin, Charles A.; Shabbar, Amir; Knox, John L.

doi:10.2151/jmsj1965.69.4_459

Cited by 17 publications

(6 citation statements)

References 21 publications

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“…This result is not entirely consistent with the results of Wallace and Gutzler (1981), Shabbar et al (1990), andHiguchi et al (1991). These studies found that a weak Icelandic Low (associated with positive NAO phase) is positively correlated with a strong Aleutian Low (associated with positive PNA phase).…”

Section: The Baffin Island±west Atlantic Teleconnection: Bwa Indexcontrasting

confidence: 52%

“…These studies found that a weak Icelandic Low (associated with positive NAO phase) is positively correlated with a strong Aleutian Low (associated with positive PNA phase). In their examination of the transport of sensible heat in the northern latitudes, Higuchi et al (1991) noted that, from the early to mid-1970s an increase in the meridional sensible heat transport has taken place over the Gulf of Alaska (positive PNA). However, over the north-eastern North Atlantic, a decrease in the transport is observed (positive NAO).…”

Section: The Baffin Island±west Atlantic Teleconnection: Bwa Indexmentioning

confidence: 99%

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The association between the BWA index and winter surface temperature variability over eastern Canada and west Greenland

et al. 1997

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Section: The Baffin Island±west Atlantic Teleconnection: Bwa Indexcontrasting

confidence: 52%

Section: The Baffin Island±west Atlantic Teleconnection: Bwa Indexmentioning

confidence: 99%

The association between the BWA index and winter surface temperature variability over eastern Canada and west Greenland

et al. 1997

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“…1a, the largest negative value (or the "cold spot") of the zonally asymmetric component of climatological-mean 850-hPa temperature is located over the northern Far East to the east of the Siberian high, where the monsoonal northerlies prevail. This phase shift corresponds to the poleward heat transport over the Far East, which is the strongest over the entire Northern Hemisphere (Higuchi et al 1991). Encountering a warm air mass in the subtropics, the monsoonal flow acts to sustain extremely tight meridional temperature gradient over the midlatitude Far East (e.g., Nakamura et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Intraseasonal Amplification of the Cold Siberian High

Takaya

Nakamura

2005

Journal of the Atmospheric Sciences

307

214

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Mechanisms of intraseasonal amplification of the Siberian high are investigated on the basis of composite anomaly evolution for its strongest events at each of the grid points over Siberia. At each location, the amplification of the surface high is associated with formation of a blocking ridge in the upper troposphere. Over central and western Siberia, what may be called "wave-train (Atlantic-origin)" type is common, where a blocking ridge forms as a component of a quasi-stationary Rossby wave train propagating across the Eurasian continent. A cold air outbreak follows once anomalous surface cold air reaches the northeastern slope of the Tibetan Plateau.It is found through the potential vorticity (PV) inversion technique that interaction between the upperlevel stationary Rossby wave train and preexisting surface cold anomalies is essential for the strong amplification of the surface high. Upper-level PV anomalies associated with the wave train reinforce the cold anticyclonic anomalies at the surface by inducing anomalous cold advection that counteracts the tendency of the thermal anomalies themselves to migrate eastward as surface thermal Rossby waves. The surface cold anomalies thus intensified, in turn, act to induce anomalous vorticity advection aloft that reinforces the blocking ridge and cyclonic anomalies downstream of it that constitute the propagating wave train. The baroclinic development of the anomalies through this vertical coupling is manifested as a significant upward flux of wave activity emanating from the surface cold anomalies, which may be interpreted as dissipative destabilization of the incoming external Rossby waves.

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“…In order to further understand the baroclinic transition process, the eddy flux is diagnosed (DelSole, 2001; Higuchi et al., 1991; Lau, 1978). The height‐time cross‐sections of the averaged pole‐ward eddy heat flux