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contributor authorBlack, Jiaxin
contributor authorJohnson, Nathaniel C.
contributor authorBaxter, Stephen
contributor authorFeldstein, Steven B.
contributor authorHarnos, Daniel S.
contributor authorL’Heureux, Michelle L.
date accessioned2017-06-09T17:34:38Z
date available2017-06-09T17:34:38Z
date issued2017
identifier issn0027-0644
identifier otherams-87445.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4231115
description abstracthe Pacific/North American (PNA) pattern, North Atlantic Oscillation (NAO), and Arctic Oscillation (AO) are three dominant teleconnection patterns known to strongly affect December-February surface weather in the Northern Hemisphere. A partial least-squares regression (PLSR) method is adopted in this study to generate wintertime 2-week statistical forecasts of these three teleconnection pattern indices for lead times of up to five weeks over the 1980-2013 period. The PLSR approach generates forecasts for the teleconnection pattern indices by maximizing the variance explained by predictor indices determined as linear combinations of predictor fields, which include gridded outgoing longwave radiation (OLR), 300-hPa geopotential height (Z300), and 50-hPa geopotential height (Z50). Overall, the PLSR models yield statistically significant skill at all lead times up to five weeks. In particular, cross-validated correlations between the combined weeks 3-4 PLSR forecasts and verification for the PNA, NAO and AO indices are 0.34, 0.28 and 0.41. The PLSR approach also allows the authors to isolate a small number of predictor patterns that help shed light on the sources of prediction skill for each teleconnnection pattern. As expected, the results reveal the importance of tropical convection (OLR) for forecast skill in weeks 3-4, but the initial atmospheric flow (Z300) accounts for a substantial fraction of the skill as well. Overall, the results of this study provide promise for improving subseasonal-to-seasonal (S2S) forecasts and the physical understanding of predictability on these time scales.
publisherAmerican Meteorological Society
titleThe Predictors and Forecast Skill of Northern Hemisphere Teleconnection Patterns for Lead Times of 3-4 Weeks
typeJournal Paper
journal volume145
journal issue007
journal titleMonthly Weather Review
identifier doi10.1175/MWR-D-16-0394.1
journal fristpage2855
journal lastpage2877
treeMonthly Weather Review:;2017:;volume( 145 ):;issue: 007
contenttypeFulltext


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