Synoptic aspects and physical processes in the rapidly intensifying cyclone of 6–8 March 1986

Yau, M. K.; Jean, M.

doi:10.1080/07055900.1989.9649328

Cited by 27 publications

(24 citation statements)

References 32 publications

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“…In this sense the surface temperature gradient is partly responsible for the changes in the baroclinic instability of the lower atmosphere through the associated local heating. This mechanism is considered in a number of case studies (e.g., Yau and Jean 1989;Giordani and Caniaux 2001). Correlations between the surface temperature gradient and winter SLP anomalies (not shown) are much lower than between the surface temperature gradient and the intensity of UHFV (Fig.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Rapidly intensifying cyclones are primarily associated with the coastline of the American continent (Sanders 1986;Rogers and Bosart 1986). Yau and Jean (1989) showed that the generation of very fast and deep cyclones in the North Atlantic occurs over either the American coastal zone, or over the Gulf Stream SST front. Hoskins and Valdes (1990) argued that the diabatic heating is very important for the maintenance of baroclinicity.…”

Section: Relationships Between the Intensity Of Synoptic Processes Anmentioning

confidence: 99%

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Climatology and Interannual Variability in the Intensity of Synoptic-Scale Processes in the North Atlantic from the NCEP–NCAR Reanalysis Data

Gulev¹,

Jung²,

Ruprecht³

2002

J. Climate

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North Atlantic synoptic-scale processes are analyzed by bandpassing 6-hourly NCEP-NCAR reanalysis data for several synoptic ranges corresponding to ultrahigh-frequency variability (0.5-2 days), synopticscale variability (2-6 days), slow synoptic processes (6-12 days), and low-frequency variability (12-30 days). Climatological patterns of the intensity of synoptic processes are not collocated for different ranges of variability, especially in the lower troposphere. Intensities of synoptic processes demonstrate opposite trends between the North American coast and in the northeast Atlantic. Although north of 40ЊN the intensity of ultrahigh-frequency variability and synoptic-scale processes show similar interannual variability, further analysis indicates that secular changes, and decadal-scale and interannual variability in the intensities of synoptic processes may not be necessarily consistent for different synoptic timescales. Magnitudes of winter ultrahigh-frequency variability are highly correlated with the intensity of synoptic-scale processes in the 1960s and early 1970s. However, they show little agreement with each other during the last two decades, pointing to the remarkable change in atmospheric variability over the North Atlantic in late 1970s. North Atlantic ultrahigh-frequency variability in winter is highly correlated with surface temperature gradient anomalies in the Atlantic-American sector. These gradients are computed from the merged fields of SST and surface temperature over the continent. They demonstrate a dipolelike pattern associated with the North American coast on one hand, with the subpolar SST front and continental Canada on the other. High-frequency variability and its synoptic counterpart demonstrate different relationships with the North Atlantic Oscillation. Reliability of these results and their sensitivity to the filtering procedures are addressed by comparison to radiosonde data and application of alternative filters.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Relationships Between the Intensity Of Synoptic Processes Anmentioning

confidence: 99%

Climatology and Interannual Variability in the Intensity of Synoptic-Scale Processes in the North Atlantic from the NCEP–NCAR Reanalysis Data

Gulev¹,

Jung²,

Ruprecht³

2002

J. Climate

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“…Thus, the 1-monthlagged negative correlation obtained is consistent with the general idea that increased sea-air flux leads to decreasing temperature (i.e., Cayan 1992c) and with the hypothesis that the increase of the cyclonic activity (thus, higher SSTD of sea-air fluxes) will support the cooling of the mixed layer. There is evidence that the intensification of the cyclonic activity is associated with increasing turbulent fluxes in individual cyclones, connected with cold-air outbreaks in offshore regions and over midlatitude SST fronts (Yau and Jean 1989;Gulev and Tonkacheev 1994;Miller and Katsaros 1992). Synoptic forcing of SST anomalies by fluctuating sea-air heat flux is more effective in autumn for sampled SSTD and during spring for SSTD calculated from previously averaged series with ϭ 72-120 h. The largest absolute values of the negative lagged correlation in Figs.…”

Section: B Relation Of Intramonthly Statistics To the Sst Variabilitymentioning

confidence: 99%

Climate Variability of the Intensity of Synoptic Processes in the North Atlantic Midlatitudes

Gulev¹

1997

J. Climate

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Long-term interannual variations of the intramonthly standard deviations of surface meteorological parameters are studied on the basis of the North Atlantic Ocean Weather Stations (OWSs) dataset. To consider the different scales of short-term synoptic variability, intramonthly statistics were calculated for 3-h sampled data and for running-mean data as well. Year-to-year variability is considered in terms of linear trends and interannual oscillations with characteristic periods of several years. Intramonthly standard deviations for most of the parameters tended to decrease during the OWS observational period. Trends in the parameters for different synoptic-scale statistics are discussed. Intramonthly statistics, computed for different averaging scales, demonstrate remarkably different short-period year to year oscillations. Some relationships between the interannual variations of synoptic activity and the SST anomalies are presented. Intramonthly statistics are found to be an effective indicator of the North Atlantic Oscillation. Finally, the possibility of applying results to statistics computed from climatological datasets and analyses of meteorological centers is discussed.

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“…Case studies (e.g., Yau and Jean 1989;LabSea Group 1998;Bond et al 2010;Tomita et al 2010) show that in the mid-and subpolar latitudes, particularly in the western boundary current regions, extreme turbulent fluxes exceeding 1000-2000 W m 22 occur at such scales as of tens of kilometers and hours. These extremes are typically associated with the intense synoptic transients experiencing explosive development over the midlatitudinal ocean (Bond and Cronin 2008;Zolina and Gulev 2003;Shaman et al 2010;Rudeva and Gulev 2011).…”

Section: Introductionmentioning

confidence: 99%

Probability Distribution Characteristics for Surface Air–Sea Turbulent Heat Fluxes over the Global Ocean

Gulev

Belyaev

2012

Journal of Climate

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To analyze the probability density distributions of surface turbulent heat fluxes, the authors apply the twoparametric modified Fisher-Tippett (MFT) distribution to the sensible and latent turbulent heat fluxes recomputed from 6-hourly NCEP-NCAR reanalysis state variables for the period from 1948 to 2008. They derived the mean climatology and seasonal cycle of the location and scale parameters of the MFT distribution. Analysis of the parameters of probability distributions identified the areas where similar surface turbulent fluxes are determined by the very different shape of probability density functions.

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Synoptic aspects and physical processes in the rapidly intensifying cyclone of 6–8 March 1986

Abstract: A synoptic analysis for the 6-8 March 1986

Cited by 27 publications

References 32 publications

Climatology and Interannual Variability in the Intensity of Synoptic-Scale Processes in the North Atlantic from the NCEP–NCAR Reanalysis Data

Climatology and Interannual Variability in the Intensity of Synoptic-Scale Processes in the North Atlantic from the NCEP–NCAR Reanalysis Data

Climate Variability of the Intensity of Synoptic Processes in the North Atlantic Midlatitudes

Probability Distribution Characteristics for Surface Air–Sea Turbulent Heat Fluxes over the Global Ocean

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