• Cohen J., , and J. Jones, 2011: Tropospheric precursors and stratospheric warmings. J. Climate, 24, 65626572.

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    Sea level pressure (SLP) anomalies (hPa) (a) averaged −45 to 0 days prior to vortex displacements, (b) averaged 0 to +45 days after vortex displacements, (c) averaged −45 to 0 days prior to vortex splits, and (d) averaged 0 to +45 days after vortex splits. Colored shading represents anomalies, solid contours show the full values of the SLP field, and dashed contours represent 90% and 95% confidence levels. Mean values are computed daily over the reanalysis period 1948–2010.

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    As in Fig. 1, but for the 200 hPa geopotential height (dam).

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    Vertical wave activity flux (WAF) anomalies (m2 s−2) at 100 hPa (a) averaged −45 to −30 days, (b) averaged −30 to −15 days, and (c) averaged −15 to 0 days prior to vortex displacements and (d) averaged −45 to −30 days, (e) averaged −30 to −15 days, and (f) averaged −15 to 0 days prior to vortex splits. WAF anomalies shaded.

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    Polar cap geopotential height anomalies (shading) and WAF anomalies bounded by 40°–80°N, 30°E–180° (contouring) from 45 days prior until 45 days after (a) vortex displacements and (b) vortex splits. Values shaded and contoured every 0.2 standardized anomalies. Also shown are only those values for geopotential height anomalies (shown in solid contours) found to be statistically significant at the 95% confidence level or higher (blue shading) and those WAF values (shown in dashed contouring) found to be statistically significant at the 95% confidence level or higher (red shading) for (b) vortex displacements and (d) vortex splits.

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    Area-averaged daily SLP anomalies in the area bounded by 60°–75°N, 30–90°E (black line) and WAF anomalies over the Eurasian sector (blue line) for (a) vortex displacements and (b) vortex splits. (c) The sum of the area-averaged difference in SLP for the boxes bounded by 55°–70°N, 30°–90°E; 55°–70°N, 120°W–180°; and 40°–50°N, 30°–60°W for vortex displacements and splits. Red and green symbols represent 95% significance for SLP and WAF anomalies, respectively. SLP anomalies given in hPa, and WAF anomalies given in m2 s−2 multiplied by 25. Top axis of (a)–(c) and bottom axis of (c) represent days before and after stratospheric warming event, and bottom axis in (a) and (b) shows mean calendar date.

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    SLP anomalies (hPa) (a) averaged −28 to −21 days, (b) averaged −21 to −14 days, and (c) averaged −14 to −7 days prior to vortex displacements and (d) averaged −28 to −21 days, (e) averaged −21 to −14 days, and (f) averaged −14 to −7 days prior to vortex splits. Colored shading represents anomalies; solid contours show the full values of the SLP field. Mean values are computed daily over the reanalysis period 1948–2010.

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    (a) Change in snow cover extent across Eurasia (a) two to four weeks prior to a vortex displacement and (b) two to four weeks prior to a vortex split.

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  • 1 Atmospheric and Environmental Research, Inc., Lexington, Massachusetts
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Because of a production error, the figures published in Cohen and Jones (2011) were of inferior quality. To correct this, the following pages contain the full article as it should have appeared, with the figures processed properly.

The staff of the Journal of Climate regrets any inconvenience this error may have caused.

REFERENCE

Cohen J., , and J. Jones, 2011: Tropospheric precursors and stratospheric warmings. J. Climate, 24, 65626572.

Fig. 1.
Fig. 1.

Sea level pressure (SLP) anomalies (hPa) (a) averaged −45 to 0 days prior to vortex displacements, (b) averaged 0 to +45 days after vortex displacements, (c) averaged −45 to 0 days prior to vortex splits, and (d) averaged 0 to +45 days after vortex splits. Colored shading represents anomalies, solid contours show the full values of the SLP field, and dashed contours represent 90% and 95% confidence levels. Mean values are computed daily over the reanalysis period 1948–2010.

Citation: Journal of Climate 25, 5; 10.1175/JCLI-D-11-00701.1

Fig. 2.
Fig. 2.

As in Fig. 1, but for the 200 hPa geopotential height (dam).

Citation: Journal of Climate 25, 5; 10.1175/JCLI-D-11-00701.1

Fig. 3.
Fig. 3.

Vertical wave activity flux (WAF) anomalies (m2 s−2) at 100 hPa (a) averaged −45 to −30 days, (b) averaged −30 to −15 days, and (c) averaged −15 to 0 days prior to vortex displacements and (d) averaged −45 to −30 days, (e) averaged −30 to −15 days, and (f) averaged −15 to 0 days prior to vortex splits. WAF anomalies shaded.

Citation: Journal of Climate 25, 5; 10.1175/JCLI-D-11-00701.1

Fig. 4.
Fig. 4.

Polar cap geopotential height anomalies (shading) and WAF anomalies bounded by 40°–80°N, 30°E–180° (contouring) from 45 days prior until 45 days after (a) vortex displacements and (b) vortex splits. Values shaded and contoured every 0.2 standardized anomalies. Also shown are only those values for geopotential height anomalies (shown in solid contours) found to be statistically significant at the 95% confidence level or higher (blue shading) and those WAF values (shown in dashed contouring) found to be statistically significant at the 95% confidence level or higher (red shading) for (b) vortex displacements and (d) vortex splits.

Citation: Journal of Climate 25, 5; 10.1175/JCLI-D-11-00701.1

Fig. 5.
Fig. 5.

Area-averaged daily SLP anomalies in the area bounded by 60°–75°N, 30–90°E (black line) and WAF anomalies over the Eurasian sector (blue line) for (a) vortex displacements and (b) vortex splits. (c) The sum of the area-averaged difference in SLP for the boxes bounded by 55°–70°N, 30°–90°E; 55°–70°N, 120°W–180°; and 40°–50°N, 30°–60°W for vortex displacements and splits. Red and green symbols represent 95% significance for SLP and WAF anomalies, respectively. SLP anomalies given in hPa, and WAF anomalies given in m2 s−2 multiplied by 25. Top axis of (a)–(c) and bottom axis of (c) represent days before and after stratospheric warming event, and bottom axis in (a) and (b) shows mean calendar date.

Citation: Journal of Climate 25, 5; 10.1175/JCLI-D-11-00701.1

Fig. 6.
Fig. 6.

SLP anomalies (hPa) (a) averaged −28 to −21 days, (b) averaged −21 to −14 days, and (c) averaged −14 to −7 days prior to vortex displacements and (d) averaged −28 to −21 days, (e) averaged −21 to −14 days, and (f) averaged −14 to −7 days prior to vortex splits. Colored shading represents anomalies; solid contours show the full values of the SLP field. Mean values are computed daily over the reanalysis period 1948–2010.

Citation: Journal of Climate 25, 5; 10.1175/JCLI-D-11-00701.1

Fig. 7.
Fig. 7.

(a) Change in snow cover extent across Eurasia (a) two to four weeks prior to a vortex displacement and (b) two to four weeks prior to a vortex split.

Citation: Journal of Climate 25, 5; 10.1175/JCLI-D-11-00701.1

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