Long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest Alaska
Abstract Sedimentological analyses of 289 years (AD 1718–2006) of varved sediment from Shadow Bay, southwest Alaska, were used to investigate hydroclimate variability during and prior to the instrumental period. Varve thicknesses relate most strongly to total annual discharge (r 2 = 0.75, n = 43, p...
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crcambridgeupr:10.1016/j.yqres.2011.04.005 2024-06-09T07:38:07+00:00 Long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest Alaska Kaufman, Claire A. Lamoureux, Scott F. Kaufman, Darrell S. 2011 http://dx.doi.org/10.1016/j.yqres.2011.04.005 http://api.elsevier.com/content/article/PII:S0033589411000603?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589411000603?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400007602 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 76, issue 1, page 1-9 ISSN 0033-5894 1096-0287 journal-article 2011 crcambridgeupr https://doi.org/10.1016/j.yqres.2011.04.005 2024-05-15T12:57:01Z Abstract Sedimentological analyses of 289 years (AD 1718–2006) of varved sediment from Shadow Bay, southwest Alaska, were used to investigate hydroclimate variability during and prior to the instrumental period. Varve thicknesses relate most strongly to total annual discharge (r 2 = 0.75, n = 43, p < 0.0001). Maximum annual grain size depends most strongly on maximum spring daily discharge (r 2 = 0.63, n = 43, p < 0.0001) and maximum annual daily discharge (r 2 = 0.61, n = 43, p < 0.0001), while varve thickness is poorly correlated with maximum annual grain size (r 2 = 0.004, n = 287, p = 0.33). Relations between varve thickness and annual climate variables (temperature, precipitation, North Pacific (NP) and Pacific Decadal Oscillation (PDO) indices) are insignificant. On multidecadal timescales, however, regime shifts in varve thickness and total annual discharge coincide with shifts in NP and PDO indices. Periods with increased varve thickness and total annual discharge were associated with warm PDO phases and a strengthened Aleutian Low. The varve-inferred record of PDO suggests that any periodicity in the PDO varied over time, and that the early 19th century marked a transition to a more frequent or detectable shifts. Article in Journal/Newspaper aleutian low Alaska Cambridge University Press Pacific Quaternary Research 76 1 1 9 |
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English |
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Abstract Sedimentological analyses of 289 years (AD 1718–2006) of varved sediment from Shadow Bay, southwest Alaska, were used to investigate hydroclimate variability during and prior to the instrumental period. Varve thicknesses relate most strongly to total annual discharge (r 2 = 0.75, n = 43, p < 0.0001). Maximum annual grain size depends most strongly on maximum spring daily discharge (r 2 = 0.63, n = 43, p < 0.0001) and maximum annual daily discharge (r 2 = 0.61, n = 43, p < 0.0001), while varve thickness is poorly correlated with maximum annual grain size (r 2 = 0.004, n = 287, p = 0.33). Relations between varve thickness and annual climate variables (temperature, precipitation, North Pacific (NP) and Pacific Decadal Oscillation (PDO) indices) are insignificant. On multidecadal timescales, however, regime shifts in varve thickness and total annual discharge coincide with shifts in NP and PDO indices. Periods with increased varve thickness and total annual discharge were associated with warm PDO phases and a strengthened Aleutian Low. The varve-inferred record of PDO suggests that any periodicity in the PDO varied over time, and that the early 19th century marked a transition to a more frequent or detectable shifts. |
format |
Article in Journal/Newspaper |
author |
Kaufman, Claire A. Lamoureux, Scott F. Kaufman, Darrell S. |
spellingShingle |
Kaufman, Claire A. Lamoureux, Scott F. Kaufman, Darrell S. Long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest Alaska |
author_facet |
Kaufman, Claire A. Lamoureux, Scott F. Kaufman, Darrell S. |
author_sort |
Kaufman, Claire A. |
title |
Long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest Alaska |
title_short |
Long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest Alaska |
title_full |
Long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest Alaska |
title_fullStr |
Long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest Alaska |
title_full_unstemmed |
Long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest Alaska |
title_sort |
long-term river discharge and multidecadal climate variability inferred from varved sediments, southwest alaska |
publisher |
Cambridge University Press (CUP) |
publishDate |
2011 |
url |
http://dx.doi.org/10.1016/j.yqres.2011.04.005 http://api.elsevier.com/content/article/PII:S0033589411000603?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589411000603?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400007602 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low Alaska |
genre_facet |
aleutian low Alaska |
op_source |
Quaternary Research volume 76, issue 1, page 1-9 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2011.04.005 |
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Quaternary Research |
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76 |
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9 |
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1801370527576621056 |