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Ocean‐atmosphere forcing of centennial hydroclimate variability in the Pacific Northwest

Identifieur interne : 004806 ( Main/Exploration ); précédent : 004805; suivant : 004807

Ocean‐atmosphere forcing of centennial hydroclimate variability in the Pacific Northwest

Auteurs : Byron A. Steinman [États-Unis] ; Mark B. Abbott [États-Unis] ; Michael E. Mann [États-Unis] ; Joseph D. Ortiz [États-Unis] ; Song Feng [États-Unis] ; David P. Pompeani [États-Unis] ; Nathan D. Stansell [États-Unis] ; Lesleigh Anderson [États-Unis] ; Bruce P. Finney [États-Unis] ; Broxton W. Bird [États-Unis]

Source :

Geophysical Research Letters [ 0094-8276 ] ; 2014-04-16.

RBID : ISTEX:619A7717C4A84BE3A656AB4BF0913885C92E8859

Abstract

Reconstructing centennial timescale hydroclimate variability during the late Holocene is critically important for understanding large‐scale patterns of drought and their relationship with climate dynamics. We present sediment oxygen isotope records spanning the last two millennia from 10 lakes, as well as climate model simulations, indicating that the Little Ice Age was dry relative to the Medieval Climate Anomaly in much of the Pacific Northwest of North America. This pattern is consistent with observed associations between the El Niño–Southern Oscillation (ENSO), the Northern Annular Mode, and drought as well as with proxy‐based reconstructions of Pacific and Atlantic ocean‐atmosphere variations over the past 1000 years. The large amplitude of centennial variability indicated by the lake data suggests that regional hydroclimate is characterized by longer‐term shifts in ENSO‐like dynamics and that an improved understanding of the centennial timescale relationship between external forcing and drought is necessary for projecting future hydroclimatic conditions in western North America.

Url:

https://api.istex.fr/document/619A7717C4A84BE3A656AB4BF0913885C92E8859/fulltext/pdf

DOI: 10.1002/2014GL059499

Affiliations:

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Le document en format XML

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<front><div type="abstract">Reconstructing centennial timescale hydroclimate variability during the late Holocene is critically important for understanding large‐scale patterns of drought and their relationship with climate dynamics. We present sediment oxygen isotope records spanning the last two millennia from 10 lakes, as well as climate model simulations, indicating that the Little Ice Age was dry relative to the Medieval Climate Anomaly in much of the Pacific Northwest of North America. This pattern is consistent with observed associations between the El Niño–Southern Oscillation (ENSO), the Northern Annular Mode, and drought as well as with proxy‐based reconstructions of Pacific and Atlantic ocean‐atmosphere variations over the past 1000 years. The large amplitude of centennial variability indicated by the lake data suggests that regional hydroclimate is characterized by longer‐term shifts in ENSO‐like dynamics and that an improved understanding of the centennial timescale relationship between external forcing and drought is necessary for projecting future hydroclimatic conditions in western North America.</div>
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Ocean‐atmosphere forcing of centennial hydroclimate variability in the Pacific Northwest

Ocean‐atmosphere forcing of centennial hydroclimate variability in the Pacific Northwest

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Abstract

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