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Paper Review

Paper Review. R98229014 馮培寧 Kirsten Feng. The North Pacific Oscillation – West Pacific Teleconnection Pattern : Mature-Phase Structure and Winter Impacts. M EGAN E . L INKIN AND S UMANT N IGAM. ACRONYM. NPO = NORTH Pacific Oscillation WP = West Pacific

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Paper Review

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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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