A SYNTHESIS OF HOLOCENE CLIMATE PROXY RECORDS, NORTHERN AND CENTRAL GREAT PLAINS, USA

<p>The early Eocene is a warm period with a very high atmosphere CO<sub>2</sub> level in the Cenozoic. It &#160;provides a good reference for our future climate under the Representative Concentration Pathway 8.5 scenario. Therefore, the early Eocene climate has received many attentions in &#160;modeling&#160;studies, for example, the Deep-Time Model Intercomparison Project (DeepMIP). However, the early Eocene palaeogeographic conditions show remarkable contrasts to the present conditions. Meanwhile, there are a few different reconstructions for the early Eocene palaeogeography, which may cause further model spreads in simulating the early Eocene warm climate. Here, we present a series of experiments carried out with the NorESM1-F, under the framework of DeepMIP. In these experiments, we consider three different palaeogeographic reconstructions for the&#160;early Eocene. We also&#160;compare&#160;our simulations with climate proxy records, to validate which palaeogeographic reconstructions can reproduce simulations that agree better with the climate proxy records.</p>

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Holocene climate change in Henan area: A synthesis of proxy records

Quaternary International ◽

10.1016/j.quaint.2019.05.026 ◽

2019 ◽

Vol 521 ◽

pp. 185-193 ◽

Cited By ~ 1

Author(s):

Kaifeng Li ◽

Wenhua Gao

Keyword(s):

Climate Change ◽

Holocene Climate ◽

Proxy Records ◽

Holocene Climate Change

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Late Pleistocene and Late Holocene Lake Highstands in the Pyramid Lake Subbasin of Lake Lahontan, Nevada, USA

Quaternary Research ◽

10.1016/j.yqres.2005.02.011 ◽

2005 ◽

Vol 64 (2) ◽

pp. 257-263 ◽

Cited By ~ 39

Author(s):

Richard W. Briggs ◽

Steven G. Wesnousky ◽

Kenneth D. Adams

Keyword(s):

Sierra Nevada ◽

Late Pleistocene ◽

Late Holocene ◽

Large Lakes ◽

Western Basin ◽

Radiocarbon Dates ◽

Beach Ridges ◽

Climate Proxy ◽

Pyramid Lake ◽

Proxy Records

AbstractShoreline geomorphology, shoreline stratigraphy, and radiocarbon dates of organic material incorporated in constructional beach ridges record large lakes during the late Pleistocene and late Holocene in the Pyramid Lake subbasin of Lake Lahontan, Nevada, USA. During the late Holocene, a transgression began at or after 3595 ± 35 14C yr B.P. and continued, perhaps in pulses, through 2635 ± 40 14C yr B.P., resulting in a lake as high as 1199 m. During the latest Pleistocene and overlapping with the earliest part of the Younger Dryas interval, a lake stood at approximately 1212 m at 10,820 ± 35 14C yr B.P. and a geomorphically and stratigraphically distinct suite of constructional shorelines associated with this lake can be traced to 1230 m. These two lake highstands correspond to periods of elevated regional wetness in the western Basin and Range that are not clearly represented in existing northern Sierra Nevada climate proxy records.

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On the Identification and Characterization of Drought and Aridity in Postglacial Paleoenvironmental Records from the Northern Great Plains

Géographie physique et Quaternaire ◽

10.7202/009108ar ◽

2004 ◽

Vol 56 (2-3) ◽

pp. 229-246 ◽

Cited By ~ 8

Author(s):

Alwynne B. Beaudoin

Keyword(s):

Global Warming ◽

High Resolution ◽

Great Plains ◽

Northern Great Plains ◽

Short Term ◽

Instrumental Data ◽

Proxy Records ◽

Identification And Characterization

Abstract The Northern Great Plains region is especially sensitive to drought and is likely to be even more drought-prone under projected global warming. Drought has been invoked as an explanatory factor for changes seen in postglacial paleoenvironmental records. These proxy records may extend drought history derived from instrumental data. Moreover, in the last decade, some paleoenvironmental studies have been expressly undertaken for the examination of long-term drought history. Nevertheless, few such studies explicitly define drought. This makes it difficult to compare results or to understand what the results mean in terms of the operational drought definitions that are used in resource management. Operational drought is defined as usually short-term; longer sustained dry intervals reflect a shift to aridity. Therefore, high resolution paleoenvironmental proxies (annual or subdecadal) are best for the investigation of drought history. Such proxies include tree rings and some lake records. However, most lake-based records are sampled at lower resolution (decadal or subcentury) and are therefore providing aridity signals.

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Equatorial insolation: from precession harmonics to eccentricity frequencies

Climate of the Past Discussions ◽

10.5194/cpd-2-519-2006 ◽

2006 ◽

Vol 2 (4) ◽

pp. 519-533 ◽

Cited By ~ 10

Author(s):

A. Berger ◽

M. F. Loutre ◽

J. L. Mélice

Keyword(s):

Climate Change ◽

Variance Components ◽

Ice Age ◽

Substantial Evidence ◽

Spectral Analyses ◽

Upper Pleistocene ◽

Climate Proxy ◽

Proxy Records ◽

Climatic Records

Abstract. Since the paper by Hays et al. (1976), spectral analyses of climate proxy records provide substantial evidence that a fraction of the climatic variance is driven by insolation changes in the frequency ranges of obliquity and precession variations. However, it is the variance components centered near 100 kyr which dominate most Upper Pleistocene climatic records, although the amount of insolation perturbation at the eccentricity driven 100-kyr period is much too small to cause directly a climate change of ice-age amplitude. Many attempts to find an explanation to this 100-kyr cycle in climatic records have been made over the last decades. Here we show that the double maximum which characterizes the daily irradiation received in tropical latitudes over the course of the year is at the origin in equatorial insolation of not only a strong 100-kyr, but also of a 11-kyr and a 5.5-kyr periods related respectively to eccentricity and to precession.

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Holocene climate variability on millennial scales recorded in Greenland ice cores

Nonlinear Processes in Geophysics ◽

10.5194/npg-12-345-2005 ◽

2005 ◽

Vol 12 (3) ◽

pp. 345-352 ◽

Cited By ~ 33

Author(s):

A. Witt ◽

A. Y. Schumann

Keyword(s):

Climate Variability ◽

Significant Contribution ◽

Ice Cores ◽

Typical Feature ◽

Ocean Dynamics ◽

Climate Proxy ◽

Proxy Records ◽

Analysis Technique ◽

Orbital Cycles ◽

Paleoclimate Proxy

Abstract. Climate variability is triggered by several solar and orbital cycles as well as by the intern ocean dynamics. Consequently, paleoclimate proxy records are expected to vary on very different time scales ranging from subdecadal to millennial duration. We demonstrate, that Foster's (Foster, 1996) wavelet analysis technique is an appropriate tool for investigating temporarily changing spectral properties of records characterized by awkward sampling quality, which is a typical feature of climate proxy records. By applying it to the Holocene part of different glaciochemical records of Greenland ice cores we proof evidence for a significant contribution of the 1.47 kiloyears cycle over alomst the entire Holocene.

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Solar cycles or random processes? Evaluating solar variability in Holocene climate records

Scientific Reports ◽

10.1038/srep23961 ◽

2016 ◽

Vol 6 (1) ◽

Cited By ~ 15

Author(s):

T. Edward Turner ◽

Graeme T. Swindles ◽

Dan J. Charman ◽

Peter G. Langdon ◽

Paul J. Morris ◽

...

Keyword(s):

Solar Variability ◽

Solar Cycles ◽

Climate Data ◽

Critical Approach ◽

Solar Forcing ◽

Holocene Climate ◽

Proxy Records ◽

Wide Range ◽

Solar Type

Abstract Many studies have reported evidence for solar-forcing of Holocene climate change across a range of archives. These studies have compared proxy-climate data with records of solar variability (e.g. 14C or 10Be), or have used time series analysis to test for the presence of solar-type cycles. This has led to some climate sceptics misrepresenting this literature to argue strongly that solar variability drove the rapid global temperature increase of the twentieth century. As proxy records underpin our understanding of the long-term processes governing climate, they need to be evaluated thoroughly. The peatland archive has become a prominent line of evidence for solar forcing of climate. Here we examine high-resolution peatland proxy climate data to determine whether solar signals are present. We find a wide range of significant periodicities similar to those in records of solar variability: periods between 40–100 years, and 120–140 years are particularly common. However, periodicities similar to those in the data are commonly found in random-walk simulations. Our results demonstrate that solar-type signals can be the product of random variations alone, and that a more critical approach is required for their robust interpretation.

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