Late Quaternary water temperature variations of the Northwest Pacific based on the lipid paleothermometers TEXH86, UK´37 and LDI

Jonas, A.-S.; Schwark, Lorenz; Bauersachs, Thorsten

doi:10.1016/j.dsr.2017.04.018

Cited by 29 publications

(16 citation statements)

References 123 publications

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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: 98%

“…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.…”

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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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“…This oceanographic boundary currently migrates north and south seasonally, and the path and speed of the Kuroshio Current fluctuate in response to the El Niño-Southern Oscillation (ENSO) events (e.g., Teramoto & Kawabe, 1985). In the Late Pleistocene, oscillations in ENSO-like events have been documented in the sedimentary successions (Pisias, 1978;Wang et al, 2000), indicating that currents and their relative mixing zones were displaced northward or southward in response to global climate change (Bordiga et al, 2013(Bordiga et al, , 2014Chinzei et al, 1987;Gallagher et al, 2015;Jian et al, 2000;Jonas et al, 2017;Koizumi & Yamamoto, 2010;Oba et al, 2006;Yasudomi et al, 2014).…”

Section: Odp Site 1209: Oceanographic Settingmentioning

confidence: 99%

Calcareous Nannofossil Response to Climate Variability During the Middle Pleistocene Transition in the Northwest Pacific Ocean (Ocean Drilling Program Leg 198 Site 1209)

Lupi

Bordiga

Sacchi

et al. 2019

Paleoceanog and Paleoclimatol

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The Middle Pleistocene Transition represents an important reorganization of climate that switched from a 41‐kyr periodicity to a quasiperiodic 100‐kyr cycle. Here, we have investigated this time interval using calcareous nannofossils from a midlatitude well‐preserved sedimentary record from the Ocean Drilling Program Site 1209 in the North West Pacific Ocean. We studied samples from 1.45 to 0.45 Ma, looking for significant changes in the nannofossil assemblages. Micropaleontological data were processed using an information theoretic model comparison that deconvolutes variations in nannofossil assemblages using different predictors. The major findings are that calcareous nannofossils permit the detection of discrete events during the Middle Pleistocene Transition. They display three different associations belonging, respectively, to the 41‐kyr world, the transition, and the 100‐kyr world. The statistical approach demonstrated that nannofossils responded abruptly at the boundaries of the transition developing in two rapid steps superimposed on a more gradual process. Moreover, a strong decrease in the genus Reticulofenestra and the beginning of the Gephyrocapsa caribbeanica acme permitted us to pinpoint climate events within the Middle Pleistocene Transition. Finally, through the nannofossil paleoecology, we documented an anomalous long‐term warming trend that could be related to an intensification of the Walker circulation and the stabilization of long‐term conditions like La Niña at the midlatitudes of the NW Pacific during the Middle Pleistocene Transition.

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Late Quaternary water temperature variations of the Northwest Pacific based on the lipid paleothermometers TEXH86, UK´37 and LDI

Cited by 29 publications

References 123 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

Calcareous Nannofossil Response to Climate Variability During the Middle Pleistocene Transition in the Northwest Pacific Ocean (Ocean Drilling Program Leg 198 Site 1209)

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