Placing the Common Era in a Holocene context: Millennial to centennial patterns and trends in the hydroclimate of North America over the past 2000 years

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Abstract

<p><strong>Abstract.</strong> A synthesis of 93 hydrologic records from across North and Central America, and adjacent tropical and Arctic islands, reveals centennial to millennial trends in the regional hydroclimates of the Common Era (CE; past 2000 years). The hydrological records derive from materials stored in lakes, bogs, caves, and ice from extant glaciers, which have the continuity through time to preserve low-frequency ( &amp;gt; 100 year) climate signals that may extend deeper into the Holocene. The most common pattern, represented in 46 (49<span class="thinspace"></span>%) of the records, indicates that the centuries before 1000<span class="thinspace"></span>CE were drier than the centuries since that time. Principal component analysis indicates that millennial-scale trends represent the dominant pattern of variance in the southwestern US, northeastern US, mid-continent, Pacific Northwest, Arctic, and tropics, although not all records within a region show the same direction of change. The Pacific Northwest and the southernmost tier of the tropical sites tended to dry toward present, as many other areas became wetter than before. In 22 records (24<span class="thinspace"></span>%), the Medieval Climate Anomaly period (800–1300<span class="thinspace"></span>CE) was drier than the Little Ice Age (1400–1900<span class="thinspace"></span>CE), but in many cases the difference was part of the longer millennial-scale trend, and, in 25 records (27<span class="thinspace"></span>%), the Medieval Climate Anomaly period represented a pluvial (wet) phase. Where quantitative records permitted a comparison, we found that centennial-scale fluctuations over the Common Era represented changes of 3–7<span class="thinspace"></span>% in the modern interannual range of variability in precipitation, but the accumulation of these long-term trends over the entirety of the Holocene caused recent centuries to be significantly wetter, on average, than most of the past 11<span class="thinspace"></span>000 years.</p>

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APA

Shuman, B. N., Routson, C., McKay, N., Fritz, S., Kaufman, D., Kirby, M. E., … St-Jacques, J. M. (2018, May 28). Placing the Common Era in a Holocene context: Millennial to centennial patterns and trends in the hydroclimate of North America over the past 2000 years. Climate of the Past. Copernicus GmbH. https://doi.org/10.5194/cp-14-665-2018

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