Sea surface temperature variations in the western Mediterranean Sea over the last 20 kyr: A dual‐organic proxy (U
            <sup>K′</sup>
            <sub>37</sub>
            and LDI) approach

Rodrigo-Gámiz, Marta; Martı́nez-Ruiz, Francisca; Rampen, Sebastiaan W; Schouten, Stefan; Damsté, Jaap S. Sinninghe

doi:10.1002/2013pa002466

Cited by 85 publications

(59 citation statements)

References 104 publications

(169 reference statements)

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“…However, both the U k 0 37 and TEX 86 proxies have their limitations. Nevertheless, the reconstruction of past SST using the LDI has been successful in various marine environments, predominantly in temperate regions (Jonas et al, 2017;Naafs et al, 2012;Plancq et al, 2015;Rampen et al, 2012;Rodrigo-Gámiz et al, 2014;Smith et al, 2013). Furthermore, studies comparing Recently, a new SST proxy, the long-chain diol index (LDI), was developed based on the distribution of longchain diols (LCDs; Rampen et al, 2012), that is, the ratio of the C 30 1,15-diol over the sum of C 28 1,13; C 30 1,13; and C 30 1,15-diols, with higher fractional abundances of 1,15-diol observed at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…The LDI seems to be independent from salinity but is impacted by freshwater input (De Bar et al, 2016;Lattaud, Kim, et al, 2017) and oxic degradation (Rodrigo-Gámiz et al, 2016). Nevertheless, the reconstruction of past SST using the LDI has been successful in various marine environments, predominantly in temperate regions (Jonas et al, 2017;Naafs et al, 2012;Plancq et al, 2015;Rampen et al, 2012;Rodrigo-Gámiz et al, 2014;Smith et al, 2013). However, the LDI has, up to now, never been applied in subpolar regions.…”

Section: Introductionmentioning

confidence: 99%

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A Comparison of Late Quaternary Organic Proxy‐Based Paleotemperature Records of the Central Sea of Okhotsk

Lattaud

Huang

et al. 2018

Paleoceanog and Paleoclimatol

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The long‐chain diol index (LDI) is a new organic sea surface temperature (SST) proxy based on the distribution of long‐chain diols. It has been applied in several environments but not yet in subpolar regions. Here we tested the LDI on surface sediments and a sediment core from the Sea of Okhotsk, which is the southernmost seasonal sea ice‐covered region in the Northern Hemisphere, and compared it with other organic temperature proxies, that is, U37boldk′ and TEXL86. In the surface sediments, the LDI is correlated with autumn SST, similar to the U37boldk′ but different from the TEXL86 that correlates best with summer sea subsurface temperature. Remarkably, the obtained local LDI calibration was significantly different from the global core‐top calibration. We used the local LDI calibration to reconstruct past SST changes in the central Sea of Okhotsk. The LDI‐SST record shows low glacial (Marine Isotope Stage, MIS 2, 4, and 6) and high interglacial (MIS 1 and MIS 5) temperatures and follows the same pattern as the U37boldk′‐SST and a previously published TEXL86 temperature record. Similar to the modern situation, the reconstructed temperatures during the interglacials likely reflect different seasons, that is, summer for the TEXL86 and autumn for U37boldk′ and LDI. During glacials, the reconstructed temperatures of all three proxies are similar to each other, likely reflecting summer temperatures as this was the only season free of sea ice. Our results suggest that the LDI is a suitable proxy to reconstruct subpolar seawater temperatures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparison of Late Quaternary Organic Proxy‐Based Paleotemperature Records of the Central Sea of Okhotsk

Lattaud

Huang

et al. 2018

Paleoceanog and Paleoclimatol

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“…7.5 and 8.0 °C, for the U K´3 7 and TEX H 86, respectively. Interestingly, other LDI and U K´3 7 applications on 20 glacial-interglacial timescales also show somewhat greater amplitudes for the LDI records as compared to the U K´3 7, (Rampen et al, 2012;Lopes dos Santos et al, 2013;Rodrigo-Gámiz et al, 2014;Jonas et al, 2017). This might potentially suggest that the surface sediment calibration of the LDI requires some modification, e.g., a lower slope.…”

Section: Sea Surface Temperature Evolutionmentioning

confidence: 99%

“…Preliminary applications in sediment cores of these LCD proxies have shown that the LDI, as well as the Diol Index, are promising as paleotemperature and past upwelling proxies (e.g., Pancost et al, 2009;Lopes dos Santos et al, 2012;Rampen et al, 2012;Seki et al, 2012;Rodrigo-Gámiz et al, 2014;Plancq et al, 2015;Jonas et al, 2017). However, a number of uncertainties still exist in the application of these biomarkers.…”

mentioning

confidence: 99%

A Late Quaternary climate record based on long chain diol proxies from the Chilean margin

Bar¹,

Stolwijk²,

McManus³

et al. 2018

Preprint

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Abstract. The primary focus of this study is to test the applicability of different paleoenvironmental proxies based on long chain diols, i.e., the LDI as proxy for past SST, the Diol Index as indicator of past upwelling conditions and the NDI as quantitative proxy for nitrate and phosphate concentrations in seawater. The proxies were analyzed in marine sediments recovered at ODP Site 1234, located within the Peru-Chile upwelling system, with a ~ 2 kyr resolution, covering the last 150 kyrs, i.e., encompassing several glacial and interglacial periods. We also generated TEXH86 and UK´37 temperature and planktonic δ18O records, as well as TOC and accumulation rates (ARs) of TOC and lipid biomarkers (i.e., C37 alkenones, GDGTs, dinosterol and loliolide) to reconstruct past phytoplankton production. The LDI-derived SST record co-varies with TEXH86- and UK´37-derived SST records as well as with the planktonic δ18O record, implying that the LDI reflects past SST variations at this site. TOC and phytoplankton AR records indicate increased export production during the Last Interglacial (MIS 5), simultaneous with a peak in the abundance of preserved Chaetoceros diatoms, suggesting intensified upwelling during this period. The Diol Index is relatively low during the upwelling period, but peaks before and after this period, suggesting that Proboscia diatoms were more dominant before and after the period of upwelling. The NDI reveals the same variations as the Diol Index suggesting that the input of nitrate and phosphate was minimal during upwelling, which is unrealistic. We suggest that the Diol Index should perhaps be considered as an indicator for Proboscia (multiple species) productivity instead of upwelling per se, whereas the NDI likely reflects Proboscia alata productivity, and might therefore not be suitable as a more general paleonutrient proxy.

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“…For instance, in the westernmost Mediterranean Sea, major periodicities at 1300 yr and 1515 yr, linked with North Atlantic climate variability and the African monsoon system were found out along the past 20,000 yr. Other major periodicities of 2000 yr and 5000 yr are related to solar activity. Minor secondary millennial to centennial cycles stretching along 650 yr, 1087 yr, and 3000 yr are still unknown [13]. In this work, the aim was studying the Holocene cyclostratigraphy along a core from an endorheic system (sebkha Sidi Mansour) located at the coast of the Mediterranean Sea.…”

Section: Introduction Sun Activity and Its Effect On Climatic Cyclicitymentioning

confidence: 99%

Spectral Analysis of a Core from the Sebkha of Sidi Mansour, Southern Tunisia: The Holocene Cyclostratigraphy

B¹

2015

J Geophys Remote Sens

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The Milancovitch Theory explaining the ancient cyclostratigraphy does not file a case for the Holocene cyclostratigraphy. Instead, other astronomical and oceanographic mechanisms control the cyclicity within Holocene sediment. This work aimed to find out the climatic cyclicity along a core from the sebkha of Sidi Mansour located along the Mediterranean coast in Tunisia, through using different proxies: the magnetic susceptibility, carbonate percentages and chemical elements (Ca, Na, and K). Based on previous radiocarbon and tephrochrnological dating in the study area, the core was estimated to cover the two last millennia with a sedimentation rate of 0.35 mm/yr. This rate allows the elaboration of a depth-age model to carry the spectral analysis. Not all the proxies visualize the same climatic cycles. For instance, the spectral analysis of the magnetic susceptibility and Sodium data visualized a 1000 yr cycle. The spectral analysis of Potassium data did not visualize significant cycles. The spectral analysis of the carbonate percentages and calcium data visualized dual cycles of 1700-700 yr and 493-329 yr respectively. The about 500 yr and 1000 yr cycles are related to Sun activity. Other oceanographic and atmospheric factors could generate other cycles of 1700 yr, 700 yr, 493 yr, and 329 yr. The majority of these cycles were worldwide recorded as interplay between the oceanography and the solar forcing. Contrary to the earth-driven cyclostratigraphy related to orbital parameters and geographical positions, the Holocene cyclostratigraphy is sun-driven.

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Sea surface temperature variations in the western Mediterranean Sea over the last 20 kyr: A dual‐organic proxy (U ^K′ ₃₇ and LDI) approach

Cited by 85 publications

References 104 publications

A Comparison of Late Quaternary Organic Proxy‐Based Paleotemperature Records of the Central Sea of Okhotsk

A Comparison of Late Quaternary Organic Proxy‐Based Paleotemperature Records of the Central Sea of Okhotsk

A Late Quaternary climate record based on long chain diol proxies from the Chilean margin

Spectral Analysis of a Core from the Sebkha of Sidi Mansour, Southern Tunisia: The Holocene Cyclostratigraphy

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Sea surface temperature variations in the western Mediterranean Sea over the last 20 kyr: A dual‐organic proxy (U K′ 37 and LDI) approach

Cited by 85 publications

References 104 publications

A Comparison of Late Quaternary Organic Proxy‐Based Paleotemperature Records of the Central Sea of Okhotsk

A Comparison of Late Quaternary Organic Proxy‐Based Paleotemperature Records of the Central Sea of Okhotsk

A Late Quaternary climate record based on long chain diol proxies from the Chilean margin

Spectral Analysis of a Core from the Sebkha of Sidi Mansour, Southern Tunisia: The Holocene Cyclostratigraphy

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Product

Resources

About

Sea surface temperature variations in the western Mediterranean Sea over the last 20 kyr: A dual‐organic proxy (U ^K′ ₃₇ and LDI) approach