Alkenone Paleotemperature Determinations

Herbert, Timothy D

doi:10.1016/b978-0-08-095975-7.00615-x

Cited by 64 publications

(63 citation statements)

References 262 publications

(591 reference statements)

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“…For instance, a summer temperature derived from pollen records could include a signal related to winter temperature or precipitation (Birks et al, 2010). Furthermore, attributing the signal to a particular period of the year is not always straightforward as, for instance, the sedimentary alkenone signal is usually assumed to reflect the annually averaged sea surface temperature while at high latitudes the alkenone signal is likely phased to the summer months (Bendle and RosellMelé, 2007;Herbert, 2003;Samtleben and Bickert, 1990;Thomsen et al, 1998). In this study, we decided to follow the interpretation proposed in the original studies describing the proxy-based reconstructions.…”

Section: The Proxy-based Data Setmentioning

confidence: 99%

“…These reconstructions are derived from marine, continental and ice archives using different methods such as, among others, the alkenone paleothermometry (Grimalt and Lopez, 2007;Herbert, 2003), the modern analog technique (Brewer et al, 2007a) or the stable isotopes analysis (Brook, 2007). Each quantitative reconstruction has its strengths and weaknesses (Birks et al, 2010;Juggins, 2013;Telford and Birks, 2005).…”

Section: The Proxy-based Data Setmentioning

confidence: 99%

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Investigating the consistency between proxy-based reconstructions and climate models using data assimilation: a mid-Holocene case study

et al. 2013

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Abstract. The mid-Holocene (6 kyr BP; thousand years before present) is a key period to study the consistency between model results and proxy-based reconstruction data as it corresponds to a standard test for models and a reasonable number of proxy-based records is available. Taking advantage of this relatively large amount of information, we have compared a compilation of 50 air and sea surface temperature reconstructions with the results of three simulations performed with general circulation models and one carried out with LOVE-CLIM, a model of intermediate complexity. The conclusions derived from this analysis confirm that models and data agree on the large-scale spatial pattern but the models underestimate the magnitude of some observed changes and that large discrepancies are observed at the local scale. To further investigate the origin of those inconsistencies, we have constrained LOVECLIM to follow the signal recorded by the proxies selected in the compilation using a data-assimilation method based on a particle filter. In one simulation, all the 50 proxy-based records are used while in the other two only the continental or oceanic proxy-based records constrain the model results. As expected, data assimilation leads to improving the consistency between model results and the reconstructions. In particular, this is achieved in a robust way in all the experiments through a strengthening of the westerlies at midlatitude that warms up northern Europe. Furthermore, the comparison of the LOVECLIM simulations with and without data assimilation has also objectively identified 16 proxybased paleoclimate records whose reconstructed signal is either incompatible with the signal recorded by some other proxy-based records or with model physics.

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Section: The Proxy-based Data Setmentioning

confidence: 99%

Section: The Proxy-based Data Setmentioning

confidence: 99%

Investigating the consistency between proxy-based reconstructions and climate models using data assimilation: a mid-Holocene case study

et al. 2013

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“…A global calibration of marine core top U K 0 37 values with modern surface annual mean temperature showed a linear relationship of U K 0 37 ¼ 0:033 Â SSTþ 0:044 (Müller et al, 1998), which is generally considered to be a robust SST proxy and widely used in ocean paleoclimate studies (e.g. Herbert, 2003).…”

Section: Introductionmentioning

confidence: 99%

Archaeal tetraether lipids record subsurface water temperature in the South China Sea

Jia

Zhang

Chen

et al. 2012

Organic Geochemistry

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“…In the lat ter case, the alkenone unsaturation index (U 37 k ¢ ) is com monly con verted into mean an nual sea sur face tem per a ture (SST; e.g., Naafs et al, 2011). How ever, many fac tors, such as depth or sea son al ity of haptophyte blooms, can cause the in dex to de vi ate from the mean an nual val ues and it should not be in ter preted in a sim plis tic man ner (Her bert, 2003). Ac cord ing to Law rence et al (2009), the es ti mates of alkenone tem per a ture in the sub po lar North At lan tic re flect prob a bly sum mer con di tions, be cause the high est pro duc tiv ity of coccolithophorids oc curs from sum mer to early au tumn in this area.…”

Section: Methodsmentioning

confidence: 99%

Terrestrial versus marine archives: biostratigraphical correlation of the Middle Pleistocene lacustrine records from central Europe and their equivalents in the deep-sea cores from the Portuguese margin

Bińka

Marks

2018

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The palaeolake from Ossówka, east ern Po land, is an un usual ex am ple of ba sin, in which sed i men ta tion lasted from the begin ning of the Holsteinian through sev eral cli ma tic os cil la tions un til the Early Saalian, i.e. over a pe riod of ~70,000 years. This pro vides us with the op por tu nity of cor re lat ing the dy nam i cally chang ing events on land with their po ten tial equiv a lents in the ma rine pro files. Alkenone-based tem per a ture re con struc tions us ing U 37 k ¢ are an un usual tool in this re spect. Nev er theless, as a re sult, we suc cess fully re late this pol len se quence to the chang ing SST (sea sur face tem per a ture) val ues in the colder phases of MIS 11. The bi par tite Ferdinandovian Inter gla cial was pre vi ously cor re lated with the up per part of the Cromerian com plex (MIS 13 and MIS 15). Hav ing at our dis posal lim its in the SST alkenone-based re cord, we clearly iden tify the strati graphic po si tion of the sec ond warm phase of MIS 15 and a small frag ment of MIS 14. In our opin ion, the Rhume Inter gla cial, iden ti fied in Ger many, should be lo cated within MIS 13. Us ing the avail able or bit ally tuned chro nol ogy, we also give a sub stan tial in put to es ti mate du ra tion of these ter res trial interglacials, in di cat ing the start ing and end ing points of their equiv a lents in the alkenone re cords.

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Alkenone Paleotemperature Determinations

Cited by 64 publications

References 262 publications

Investigating the consistency between proxy-based reconstructions and climate models using data assimilation: a mid-Holocene case study

Investigating the consistency between proxy-based reconstructions and climate models using data assimilation: a mid-Holocene case study

Archaeal tetraether lipids record subsurface water temperature in the South China Sea

Terrestrial versus marine archives: biostratigraphical correlation of the Middle Pleistocene lacustrine records from central Europe and their equivalents in the deep-sea cores from the Portuguese margin

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