Subpolar Link to the Emergence of the Modern Equatorial Pacific Cold Tongue

Martínez‐García, Alfredo; Rosell-Melé, Antoni; McClymont, Erin L.; Gersonde, Rainer; Haug, Gerald H.

doi:10.1126/science.1184480

Cited by 191 publications

(197 citation statements)

References 31 publications

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“…In order to test this hypothesis, we compare our results with records of ice rafted detritus (an indicator for the presence of icebergs) and sea surface temperature (SST) reconstructions obtained at ODP Site 1090 (22,23) (Fig. 3 C and D) which monitor past meridional changes in the position of both the subantarctic zone (SZ) and the STF in the Southern Ocean (Fig.…”

Section: G Menardii As a Tracer Of Past Indian To Atlantic Leakage Smentioning

confidence: 99%

Agulhas leakage as a key process in the modes of Quaternary climate changes

Caley

Giraudeau

Malaizé

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

115

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Heat and salt transfer from the Indian Ocean to the Atlantic Ocean (Agulhas leakage) has an important effect on the global thermohaline circulation and climate. The lack of long transfer record prevents elucidation of its role on climate changes throughout the Quaternary. Here, we present a 1,350-ka accumulation rate record of the planktic foraminiferal species Globorotalia menardii. We demonstrate that, according to previous assumptions, the presence and reseeding of this fauna in the subtropical southeast Atlantic was driven by interocean exchange south of Africa. The Agulhas transfer strengthened at glacial ice-volume maxima for every glacial-interglacial transition, with maximum reinforcements organized according to a 400-ka periodicity. The long-term dynamics of Agulhas leakage may have played a crucial role in regulating meridional overturning circulation and global climate changes during the Mid-Brunhes event and the Mid-Pleistocene transition, and could also play an important role in the near future.

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Section: G Menardii As a Tracer Of Past Indian To Atlantic Leakage Smentioning

confidence: 99%

Agulhas leakage as a key process in the modes of Quaternary climate changes

Caley

Giraudeau

Malaizé

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

115

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“…Between 1.5 and 1.0 Ma, the observed SST cooling of glacial stages records is accompanied by cooling of the abyssal Atlantic (Figure 2) (Sosdian and Rosenthal, 2009), elevated dust input to the Subantarctic Atlantic ( Figure 5) (Diekmann and Kuhn, 2002;Martinez-Garcia et al, 2011), and more expansive subpolar water masses in the Subantarctic Atlantic followed shortly thereafter by the Pacific and north Atlantic (Martinez-Garcia et al, 2010;McClymont et al, 2008). The efficiency of the biological pump in the modern Southern…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…430 ka (Lang and Wolff, 2011;Masson-Delmotte et al, 2010;Jouzel et al, 2008;Elderfield et al, 2012;Lawrence et al, 2006Lawrence et al, , 2009Martinez-Garcia et al, 2010), when interglacial CO 2 concentrations also increase (Hönisch et al, 2009;Lang and Wolff, 2011;MassonDelmotte et al, 2010). Although the global expression of these events has been questioned (Candy et al, 2010), the "warm" late Pleistocene interglacials observed in many records (e.g.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Pleistocene sea-surface temperature evolution: Early cooling, delayed glacial intensification, and implications for the mid-Pleistocene climate transition

McClymont

Sosdian

Rosell-Melé

et al. 2013

Earth-Science Reviews

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164

171

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Citation for published item:w glymontD iFvF nd osdi nD FwF nd osellEwel¡ e D eF nd osenth lD F @PHIQA 9i rly leisto ene se Esurf e temper ture trends X e rly oolingD gl i l intensi( tionD nd impli tions for the midE leisto ene lim te tr nsitionF9D i rthEs ien e reviewsFD IPQ F ppF IUQEIWQF Further information on publisher's website:httpXGGdxFdoiForgGIHFIHITGjFe rs irevFPHIQFHRFHHT Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Earth-science reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Earth-science reviews. 123, 2013, 10.1016/j.earscirev.2013.04.006 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. 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.A C C E P T E D M A N U S C R I P T A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 AbstractThe mid-Pleistocene climate transition (MPT) is defined by the emergence of high amplitude, quasi-100 ka glacial-interglacial cycles from a prior regime of more subtle 41 ka cycles. This change in periodicity and amplitude cannot be explained by a change in 'external' astronomical forcing. Here, we review and integrate published records of sea-surface temperatures (SSTs) to assess whether a common global expression of the MPT in the surface ocean can be recognized, and examine our findings in light of mechanisms proposed to explain climate system reorganization across the MPT. Weshow that glacial-interglacial variability in SSTs is superimposed upon a longer-term cooling trend in oceanographic systems spanning the low-to high-latitudes. Regional Alongside the long-term SST cooling trends, quasi-100 ka cycles begin to emerge in both the SST and  18 O records at 1.2 Ma, and become dominant with the expansion of the ice-sheets at 0.9 Ma. We show that the intensified glacial-stage cooling is accompanied by...

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“…The modelled surface-air temperature change, T NH , has already been compared with three independent proxy-based records of sea surface temperature (SST) change in the North Atlantic , the equatorial Pacific (Herbert et al, 2010), and the Southern Ocean (Martínez-Garcia et al, 2010) which cover at least the last 3.5 Myr. The main features of the simulated temperature change and the data-based SST reconstruction agree: the overall cooling trend from about 3.5 to 1 Myr ago is found in the simulation results and in all SST records and so is the strong glacial-interglacial (100 kyr) variability thereafter.…”

Section: Global Temperature Change ∆T Gmentioning

confidence: 99%

On the state dependency of the equilibrium climate sensitivity during the last 5 million years

et al. 2015

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Abstract.It is still an open question how equilibrium warming in response to increasing radiative forcing -the specific equilibrium climate sensitivity S -depends on background climate. We here present palaeodata-based evidence on the state dependency of S, by using CO 2 proxy data together with a 3-D ice-sheet-model-based reconstruction of land ice albedo over the last 5 million years (Myr). We find that the land ice albedo forcing depends non-linearly on the background climate, while any non-linearity of CO 2 radiative forcing depends on the CO 2 data set used. This nonlinearity has not, so far, been accounted for in similar approaches due to previously more simplistic approximations, in which land ice albedo radiative forcing was a linear function of sea level change. The latitudinal dependency of icesheet area changes is important for the non-linearity between land ice albedo and sea level. In our set-up, in which the radiative forcing of CO 2 and of the land ice albedo (LI) is combined, we find a state dependence in the calculated specific equilibrium climate sensitivity, S [CO 2 ,LI] , for most of the Pleistocene (last 2.1 Myr). During Pleistocene intermediate glaciated climates and interglacial periods, S [CO 2 ,LI] is on average ∼ 45 % larger than during Pleistocene full glacial conditions. In the Pliocene part of our analysis (2.6-5 Myr BP) the CO 2 data uncertainties prevent a well-supported calculation for S [CO 2 ,LI] , but our analysis suggests that during times without a large land ice area in the Northern Hemisphere (e.g. before 2.82 Myr BP), the specific equilibrium climate sensitivity, S [CO 2 ,LI] , was smaller than during interglacials of the Pleistocene. We thus find support for a previously proposed state change in the climate system with the widespread appearance of northern hemispheric ice sheets. This study points for the first time to a so far overlooked non-linearity in the land ice albedo radiative forcing, which is important for similar palaeodata-based approaches to calculate climate sensitivity. However, the implications of this study for a suggested warming under CO 2 doubling are not yet entirely clear since the details of necessary corrections for other slow feedbacks are not fully known and the uncertainties that exist in the ice-sheet simulations and global temperature reconstructions are large.

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Subpolar Link to the Emergence of the Modern Equatorial Pacific Cold Tongue

Cited by 191 publications

References 31 publications

Agulhas leakage as a key process in the modes of Quaternary climate changes

Agulhas leakage as a key process in the modes of Quaternary climate changes

Pleistocene sea-surface temperature evolution: Early cooling, delayed glacial intensification, and implications for the mid-Pleistocene climate transition

On the state dependency of the equilibrium climate sensitivity during the last 5 million years

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