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Deciphering Winter Weather Patterns: NPO/WP Impact and Insights

Explore the intricate structure and winter effects of the North Pacific Oscillation/West Pacific teleconnection pattern. This influential mode of midlatitude variability shapes atmospheric dynamics through meridional dipoles, ridge centers, and zonal winds, impacting storm tracks and temperatures. Discover correlations with sea surface temperatures, Arctic ice, and more. Unravel the interplay between NPO/WP and regional climate phenomena for a comprehensive understanding of winter weather dynamics.

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Deciphering Winter Weather Patterns: NPO/WP Impact and Insights

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  1. Paper Review R98229014 馮培寧 Kirsten Feng

  2. The North Pacific Oscillation – West Pacific Teleconnection Pattern : Mature-Phase Structure and Winter Impacts MEGAN E. LINKIN ANDSUMANT NIGAM

  3. ACRONYM • NPO = NORTH Pacific Oscillation • WP = West Pacific • PAO = Pacific Atlantic Oscillation • PNA = Pacific-North American

  4. ABSTRACT • NPO / WP is a prominent mode of winter midlatitude variability consitituted by both the NPO and WP teleconnection pattern. • NPO / WP variability, on subseasonal time scales, is characterized by a large-scale meridional dipole in SLP and geopotential height.

  5. One-point correlations of monthly SLP anomalies during 1958-2001 winters in the ERA-40 dataset A) Rogers NPO base point B) WG81’s NPO base point

  6. NPO pattern affects the Aleutians lows’ location and strength.

  7. NPO / WP upper-air structure The full hemisphere view shows a dualcentered ridge. The westward tilt is slight over the North Pacific with the surface pressure anomaly. The NPO/WP pattern bears some resemblance to the component of climatological stationary waves. The temperature field is hydrostatically consistent with the height distribution.

  8. NPO/WP geopotential height and temperature regressions. A) geopotential height -shading / thin contours b) temperature – thick contours

  9. Zonal wind and divergence regressions • A) NPO/WP zonal wind • B) NPO/WP horizontal divergence • C) A in PNA mode

  10. NPO/WP zonal wind and divergent circulation A) zonal wind – contoured / shaded B) divergent circulation - vectors

  11. How the heating anomalies affects the storm tracks. A) meridional wind variance B) meridional heat flux C) vertically integrated diabatic heating

  12. The NPO/WP regressions for the climatological winter precipitation and surface air temperature over North America A)B) CRU data C)D) NPO/WP regression in the same field

  13. The advective temperature change arising from the 925-hPa NPO circulation

  14. NPO/WP SST correlations and 1000-hPa wind regressions.

  15. Regressions on Sea of Okhotsk and Bering Sea ice concentration during the 1979-2001 winter months A) NPO/WP index B) WG81 WP index

  16. The comparisons of PNA and ENSO. A)B) sea level pressure C)D) precipitation E)F) surface temperature

  17. La Fin Merci Beaucoup!

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