Impact of Earth’s orbit and freshwater fluxes on Holocene climate mean seasonal cycle and ENSO characteristics

Braconnot, Pascale; Luan, Yigang; Brewer, Simon; Zheng, Weipeng

doi:10.1007/s00382-011-1029-x

Cited by 63 publications

(93 citation statements)

References 52 publications

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“…Otto-Bliesner et al (2003) and Braconnot et al (2011) noted that the seasonality of the climatological trade winds in the early Holocene model simulation was different from that in the modern-day simulations and that the differences were similar to those reported by Clement et al (2000). On the basis of these similarities they hypothesized that the changes in the seasonality of the trades in their simulations were responsible for the reduction in ENSO variance in the early Holocene, invoking the same argument as Clement et al (2000).…”

Section: Discussion Of the Resultsmentioning

confidence: 89%

“…Reduction in the amplitude of stochastic forcing from the extratropics L'Institut Pierre-Simon Laplace Coupled Model, version 4 (IPSL-CM4) (Braconnot et al 2011) Fewer warm and cold events at 6 and 9.5 ka Increased stability in the ENSO mode due to enhanced trade winds…”

Section: %mentioning

confidence: 99%

“…There is a large body of evidence suggesting that, during the early to mid-Holocene [6-10 thousand years before present (6-10 ka)], the El Niño-Southern Oscillation (ENSO) was weaker than at present [see Braconnot et al (2011) for a summary of these data]. Proxy data of SST and precipitation variability from throughout the equatorial Pacific suggest that the interannual variance in SST in the early and mid-Holocene was reduced by 20% to as much as 80% when compared to today, although Cobb et al (2013) illustrate the challenges of identifying any systematic trends through the mid-to late Holocene due to the high internal variability in variance.…”

Section: Introductionmentioning

confidence: 99%

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ENSO in the Mid-Holocene according to CSM and HadCM3

Roberts

Battisti

Tudhope³

2014

Journal of Climate

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The offline linearized ocean-atmosphere model (LOAM), which was developed to quantify the impact of the climatological mean state on the variability of the El Niño-Southern Oscillation (ENSO), is used to illuminate why ENSO changed between the modern-day and early/mid-Holocene simulations in two climate modeling studies using the NCAR Climate System Model (CSM) and the Hadley Centre Coupled Model, version 3 (HadCM3). LOAM reproduces the spatiotemporal variability simulated by the climate models and shows both the reduction in the variance of ENSO and the changes in the spatial structure of the variance during the early/mid-Holocene. The mean state changes that are important in each model are different and, in both cases, are also different from those hypothesized to be important in the original papers describing these simulations. In the CSM simulations, the ENSO mode is stabilized by the mean cooling of the SST. This reduces atmospheric heating anomalies that in turn give smaller wind stress anomalies, thus weakening the Bjerknes feedback. Within the ocean, a change in the thermocline structure alters the spatial pattern of the variance, shifting the peak variance farther east, but does not reduce the overall amount of ENSO variance. In HadCM3, the ENSO mode is stabilized by a combination of a weaker thermocline and weakened horizontal surface currents. Both of these reduce the Bjerknes feedback by reducing the ocean's SST response to wind stress forcing. This study demonstrates the importance of considering the combined effect of a mean state change on the coupled ocean-atmosphere system: conflicting and erroneous results are obtained for both models if only one model component is considered in isolation.

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Section: Discussion Of the Resultsmentioning

confidence: 89%

Section: %mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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ENSO in the Mid-Holocene according to CSM and HadCM3

Roberts

Battisti

Tudhope³

2014

Journal of Climate

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“…While natural ENSO variability through the mid-Holocene to today is currently debated, the common viewpoint is that optimum conditions prevailed during the midHolocene, when ENSO variability is considered to have been greatly reduced (Braconnet et al, 2011;Chiang et al, 2009;Cobb et al, 2013;Donders et al, 2008).…”

Section: Study Location and Backgroundmentioning

confidence: 99%

“…There are divergent views regarding the Holocene evolution of ENSO, with the common view that ENSO variability was greatly reduced during the early to midHolocene (Braconnet et al, 2011;Chiang et al, 2009;Cobb et al, 2013;Donders et al, 2007).…”

Section: Disentangling Holocene Drivers: Sea Level and Enso-climatementioning

confidence: 99%

Holocene benthic foraminiferal assemblages indicate long-term marginality of reef habitats from Moreton Bay, Australia

Narayan

Lybolt

Zhao

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Please cite this article as: Roshni Narayan, Y., Lybolt, Matt, Zhao, Jian-xin, Feng, Yuexing, Pandolfi, John M., Holocene benthic foraminiferal assemblages indicate long-term marginality of reef habitats from Moreton Bay, Australia, Palaeogeography, Palaeoclimatology, Palaeoecology (2014), doi: 10.1016/j.palaeo.2014 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Evidence for suppressed mid-Holocene northeastern Australian monsoon variability from coral luminescence

et al. 2014

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Summer monsoon rainfall in northeastern (NE) Australia exhibits substantial interannual variability resulting in highly variable river flows. The occurrence and magnitude of these seasonal river flows are reliably recorded in modern inshore corals as luminescent lines. Here we present reconstructed annual river flows for two~120 year mid-Holocene windows based on luminescence measurements from five cores obtained from three separate coral colonies. We were able to cross-date the luminescence signatures in four cores from two of the colonies, providing confidence in the derived reconstruction. Present-day NE Australian rainfall and river flow are sensitive to El Niño-Southern Oscillation (ENSO) variability, with La Niña (El Niño) events typically associated with wetter (drier) monsoon seasons. Thus, our replicated and annually resolved coral records provide valuable insights into the northern Australian summer monsoon and ENSO variability at a key period (6 ka) when greenhouse gas levels and ice sheet cover were comparable to the preindustrial period but orbital forcing was different. Average modern and mid-Holocene growth characteristics were very similar, suggesting that sea surface temperatures off NE Australia at 6 kyr were also close to present values. The reconstructed river flow record suggests, however, that the mid-Holocene Australian summer monsoon was weaker, less variable from year to year (possibly indicative of reduced ENSO variability), and characterized by more within-season flood pulses than present. In contrast to today, the delivery of moisture appears to have been dominated by eastward propagating convective coupled waves associated with the Madden-Julian Oscillation.

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Impact of Earth’s orbit and freshwater fluxes on Holocene climate mean seasonal cycle and ENSO characteristics

Cited by 63 publications

References 52 publications

ENSO in the Mid-Holocene according to CSM and HadCM3

ENSO in the Mid-Holocene according to CSM and HadCM3

Holocene benthic foraminiferal assemblages indicate long-term marginality of reef habitats from Moreton Bay, Australia

Evidence for suppressed mid-Holocene northeastern Australian monsoon variability from coral luminescence

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