Formation mechanisms of Pacific/North American teleconnection with and without its canonical tropical convection pattern

Dai, Ying; Feldstein, Steven B.; Tan, Benkui; Lee, Sukyoung

doi:10.1175/JCLI-D-16-0411.1

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Formation mechanisms of Pacific/North American teleconnection with and without its canonical tropical convection pattern

2017
By Dai, Ying ; Feldstein, Steven B. ; Tan, Benkui ; ...
Source: Journal of Climate, 30(9), 3139-3155.

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Journal Title:

Journal of Climate
Personal Author:

Dai, Ying ; Feldstein, Steven B. ; Tan, Benkui ; Lee, Sukyoung

Dai, Ying ; Feldstein, Steven B. ; Tan, Benkui ; Lee, Sukyoung Less -
Corporate Authors:

United States. National Oceanic and Atmospheric Administration. Office of Oceanic and Atmospheric Research ; Earth System Research Laboratory (U.S.) ; Physical Sciences Laboratory (U.S.) ; Modeling, Analysis, Predictions, and Projections Program (U.S.)

United States. National Oceanic and Atmospheric Administration. Office of Oceanic and Atmospheric Research ; Earth System Research Laboratory (U.S.) ; Physical Sciences Laboratory (U.S.) ; Modeling, Analysis, Predictions, and Projections Program (U.S.) Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; ESRL (Earth System Research Laboratory) ; PSL (Physical Sciences Laboratory)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; ESRL (Earth System Research Laboratory) ; PSL (Physical Sciences Laboratory) Less -
Description:

The mechanisms that drive the Pacific–North American (PNA) teleconnection pattern with and without its canonical tropical convection pattern are investigated with daily ERA-Interim and NOAA OLR data (the former pattern is referred to as the convective PNA, and the latter pattern is referred to as the nonconvective PNA). Both the convective and nonconvective positive PNA are found to be preceded by wave activity fluxes associated with a Eurasian wave train. These wave activity fluxes enter the central subtropical Pacific, a location that is favorable for barotropic wave amplification, just prior to the rapid growth of the PNA. The wave activity fluxes are stronger for the positive nonconvective PNA, suggesting that barotropic amplification plays a greater role in its development. The negative convective PNA is also preceded by a Eurasian wave train, whereas the negative nonconvective PNA grows from the North Pacific contribution to a circumglobal teleconnection pattern. Driving by high-frequency eddy vorticity fluxes is largest for the negative convective PNA, indicating that a positive feedback may be playing a more dominant role in its development.
Keywords:

[+]

Oscillation Pattern Formation Pacific-North American pattern
Source:

Journal of Climate, 30(9), 3139-3155.
DOI:

https://doi.org/10.1175/JCLI-D-16-0411.1
Document Type:

Journal Article
Funding:

Grant no. NA14OAR4310190
Place as Subject:

Pacific Area ; North America

Pacific Area ; North America Less -
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Submitted
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urn:sha256:603131b343452f8882818cbcef33c23d32a626714c4e8c113bf9b75099b8e21e
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https://repository.library.noaa.gov/view/noaa/28378/noaa_28378_DS1.pdf
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Formation mechanisms of Pacific/North American teleconnection with and without its canonical tropical convection pattern

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