Paper Review R 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 NPO = NORTH Pacific Oscillation WP = West Pacific WP = West Pacific PAO = Pacific Atlantic Oscillation PAO = Pacific Atlantic Oscillation PNA = Pacific-North American PNA = Pacific-North American ABSTRACT NPO / WP is a prominent mode of winter midlatitude variability consitituted by both the NPO and WP teleconnection pattern. 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. NPO / WP variability, on subseasonal time scales, is characterized by a large-scale meridional dipole in SLP and geopotential height. One-point correlations of monthly SLP anomalies during winters in the ERA-40 dataset One-point correlations of monthly SLP anomalies during winters in the ERA-40 dataset A) Rogers NPO base point A) Rogers NPO base point B) WG81s NPO base point B) WG81s NPO base point NPO pattern affects the Aleutians lows location and strength. NPO pattern affects the Aleutians lows location and strength. NPO / WP upper-air structure NPO / WP upper-air structure The full hemisphere view shows a dualcentered ridge. The full hemisphere view shows a dualcentered ridge. The westward tilt is slight over the North Pacific with the surface pressure anomaly. 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 NPO/WP pattern bears some resemblance to the component of climatological stationary waves. The temperature field is hydrostatically consistent with the height distribution. The temperature field is hydrostatically consistent with the height distribution. NPO/WP geopotential height and temperature regressions. NPO/WP geopotential height and temperature regressions. A) geopotential height - shading / thin contours A) geopotential height - shading / thin contours b) temperature thick contours b) temperature thick contours Zonal wind and divergence regressions Zonal wind and divergence regressions A) NPO/WP zonal wind A) NPO/WP zonal wind B) NPO/WP horizontal divergence B) NPO/WP horizontal divergence C) A in PNA mode C) A in PNA mode NPO/WP zonal wind and divergent circulation NPO/WP zonal wind and divergent circulation A) zonal wind contoured / shaded A) zonal wind contoured / shaded B) divergent circulation - vectors B) divergent circulation - vectors How the heating anomalies affects the storm tracks. How the heating anomalies affects the storm tracks. A) meridional wind variance A) meridional wind variance B) meridional heat flux B) meridional heat flux C) vertically integrated diabatic heating C) vertically integrated diabatic heating The NPO/WP regressions for the climatological winter precipitation and surface air temperature over North America The NPO/WP regressions for the climatological winter precipitation and surface air temperature over North America A)B) CRU data A)B) CRU data C)D) NPO/WP regression in the same field C)D) NPO/WP regression in the same field The advective temperature change arising from the 925- hPa NPO circulation The advective temperature change arising from the 925- hPa NPO circulation NPO/WP SST correlations and 1000-hPa wind regressions. NPO/WP SST correlations and 1000-hPa wind regressions. Regressions on Sea of Okhotsk and Bering Sea ice concentration during the winter months Regressions on Sea of Okhotsk and Bering Sea ice concentration during the winter months A) NPO/WP index A) NPO/WP index B) WG81 WP index B) WG81 WP index The comparisons of PNA and ENSO. The comparisons of PNA and ENSO. A)B) sea level pressure A)B) sea level pressure C)D) precipitation C)D) precipitation E)F) surface temperature E)F) surface temperature La Fin Merci Beaucoup!