Patterns of centennial to millennial Holocene climate variation in the North American mid-latitudes

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Climate of The Past Pub Date : 2024-08-01 DOI:10.5194/cp-20-1703-2024
Bryan N. Shuman
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Abstract

Abstract. Noise in Holocene paleoclimate reconstructions can hamper the detection of centennial to millennial climate variations and diagnoses of the dynamics involved. This paper uses multiple ensembles of reconstructions to separate signal and noise and determine what, if any, centennial to millennial variations influenced North America during the past 7000 years. To do so, ensembles of temperature and moisture reconstructions were compared across four different spatial scales: multi-continent, regional, sub-regional, and local. At each scale, two independent multi-record ensembles were compared to detect any centennial to millennial departures from the long Holocene trends, which correlate more than expected from random patterns. In all cases, the potential centennial to millennial variations had small magnitudes. However, at least two patterns of centennial to millennial variability appear evident. First, large-scale variations included a prominent Mid-Holocene anomaly from 5600–5000 yr BP that increased mean effective moisture and produced temperature anomalies of different signs in different regions. The changes shifted the north–south temperature gradient in mid-latitude North America with a pattern similar to that of the North Atlantic Oscillation (NAO). Second, correlated multi-century (∼ 350 years) variations produce a distinct spectral signature in temperature and hydroclimate records along the western Atlantic margin. Both patterns differ from random variations, but they express distinct spatiotemporal characteristics consistent with separate controlling dynamics.
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北美中纬度地区全新世百年到千年气候的变化模式
摘要全新世古气候重建中的噪声会妨碍对百年到千年气候变迁的探测以及对相关动态的诊断。本文利用多个重建集合来分离信号和噪声,并确定在过去的 7000 年中,影响北美的百年至千年变化(如果有的话)。为此,本文比较了四个不同空间尺度的温度和湿度重建集合:多大陆、区域、次区域和地方。在每个尺度上,对两个独立的多记录集合进行比较,以发现与全新世长趋势的任何百年至千年偏离,其相关性超过随机模式的预期。在所有情况下,潜在的百年到千年变化幅度都很小。然而,至少有两种百年到千年变异模式是显而易见的。首先,大尺度变化包括公元前 5600-5000 年全新世中期的显著异常,它增加了平均有效湿度,并在不同地区产生了不同迹象的温度异常。这些变化改变了北美洲中纬度地区的南北温度梯度,其模式类似于北大西洋涛动(NAO)。其次,相关的多世纪(∼ 350 年)变化在大西洋西缘的温度和水文气候记录中产生了明显的光谱特征。这两种模式都不同于随机变化,但它们表现出独特的时空特征,与单独的控制动态相一致。
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来源期刊
Climate of The Past
Climate of The Past 地学-气象与大气科学
CiteScore
7.40
自引率
14.00%
发文量
120
审稿时长
4-8 weeks
期刊介绍: Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.
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