Last Millennium ENSO Diversity and North American Teleconnections: New Insights From Paleoclimate Data Assimilation

Xinyue Luo; Sylvia Dee; Samantha StevensonYuko OkumuraNathan SteigerLuke Parsons

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Last Millennium ENSO Diversity and North American Teleconnections: New Insights From Paleoclimate Data Assimilation

机译：Last Millennium ENSO Diversity and North American Teleconnections: New Insights From Paleoclimate Data Assimilation

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El Ni?o-Southern Oscillation (ENSO) variability affects year-to-year changes in North American hydroclimate. Extra-tropical teleconnections are not always consistent between El Ni?o events due to stochastic atmospheric variability and diverse sea surface temperature anomalies, making it difficult to quantify teleconnections using only instrumentally-based records. Here we use two paleoclimate data assimilation (DA) products spanning the Last Millennium (LM) to compare changes in amplitudes and frequencies of diverse El Ni?o events during the pre-industrial period and 20th century, and to assess the stationarity of their North American hydroclimate impacts on multi-decadal to centennial timescales. Using several definitions for Central Pacific (CP) and Eastern Pacific (EP) El Ni?o, we find a marked increase in 20th century EP El Ni?o intensity, but no significant changes in CP or EP El Ni?o frequencies in response to anthropogenic forcing. The associated hydroclimate anomalies indicate (a) dry conditions across the eastern-central and northwestern U.S. during CP El Ni?o and wetter conditions in the same regions during EP El Ni?o; (b) wet conditions over the southwestern U.S. for both El Ni?o types. The magnitude of regional hydroclimate teleconnections also shows large natural variability on multi-decadal to centennial timescales. However, when the entire LM is considered, mean hydroclimate anomalies in North America during CP or EP El Ni?o are consistent in terms of sign (wet vs. dry). Results are sensitive to proxy data and model priors used in DA products. Inconsistencies between El Ni?o classification methods underscore the need for improved ENSO diversity classification when assessing precipitation teleconnections.

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《Paleoceanography》 |2022年第3期|2021PA004283-1-2021PA004283-19|共19页
作者
Xinyue Luo; Sylvia Dee; Samantha StevensonYuko OkumuraNathan SteigerLuke Parsons;
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作者单位

Department of Earth, Environmental, and Planetary Sciences, Rice University, Houston, TX, USA;

Bren School of Environmental Science and Management, University of California, Santa Barbara, CA, USA;

Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, USAInstitute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, IsraelNicholas School of the Environment, Duke University, Durham, NC, USA;

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正文语种英语
中图分类海洋学;
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ENSO; affects; hydroclimate;

Last Millennium ENSO Diversity and North American Teleconnections: New Insights From Paleoclimate Data Assimilation

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