Orbital- and millennial-scale variations in Asian dust transport path to the Japan Sea

Nagashima, Kana; Tada, Ryuji; Matsui, Hiroyuki; Irino, Tomohisa; Tani, Atsushi; Toyoda, Shin

doi:10.1016/j.palaeo.2006.11.027

Cited by 129 publications

(107 citation statements)

References 41 publications

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“…Though studies of East Asian dust in Japan Sea sediments have attempted to distinguish between Taklimakan and Inner Mongolian dust sources (e.g., Nagashima et al, 2007Nagashima et al, , 2011, we are unable to determine the relative importance of these sources in the SNP sediments included in this study. We therefore determined the weighted mean eolian dust endmember concentrations from the 0-4 and 4-8 μm size fractions of samples from these sources, with all size fractions equally contributing to the mean value ( 4 He dust EM and 232 Th dust EM , respectively; Supplementary Information, Section 4.1).…”

Section: He Terr and 232 Th Approachesmentioning

confidence: 97%

Eolian dust input to the Subarctic North Pacific

Serno

Winckler

Anderson

et al. 2014

Earth and Planetary Science Letters

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Eolian dust is a significant source of iron and other nutrients that are essential for the health of marine ecosystems and potentially a controlling factor of the high nutrient-low chlorophyll status of the Subarctic North Pacific. We map the spatial distribution of dust input using three different geochemical tracers of eolian dust, 4 He, 232 Th and rare earth elements, in combination with grain size distribution data, from a set of core-top sediments covering the entire Subarctic North Pacific. Using the suite of geochemical proxies to fingerprint different lithogenic components, we deconvolve eolian dust input from other lithogenic inputs such as volcanic ash, ice-rafted debris, riverine and hemipelagic input. While the open ocean sites far away from the volcanic arcs are dominantly composed of pure eolian dust, lithogenic components other than eolian dust play a more crucial role along the arcs. In sites dominated by dust, eolian dust input appears to be characterized by a nearly uniform grain size mode at ∼4 μm.Applying the 230 Th-normalization technique, our proxies yield a consistent pattern of uniform dust fluxes of 1-2 g/m 2 /yr across the Subarctic North Pacific. Elevated eolian dust fluxes of 2-4 g/m 2 /yr characterize the westernmost region off Japan and the southern Kurile Islands south of 45 • N and west of 165 • E along the main pathway of the westerly winds. The core-top based dust flux reconstruction is consistent with recent estimates based on dissolved thorium isotope concentrations in seawater from the Subarctic North Pacific. The dust flux pattern compares well with state-of-the-art dust model predictions in the western and central Subarctic North Pacific, but we find that dust fluxes are higher than modeled fluxes by 0.5-1 g/m 2 /yr in the northwest, northeast and eastern Subarctic North Pacific. Our results provide an important benchmark for biogeochemical models and a robust approach for downcore studies testing dust-induced iron fertilization of past changes in biological productivity in the Subarctic North Pacific.

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Section: He Terr and 232 Th Approachesmentioning

confidence: 97%

Eolian dust input to the Subarctic North Pacific

Serno

Winckler

Anderson

et al. 2014

Earth and Planetary Science Letters

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“…Nagashima et al (2007a) proposed that the Crystallinity Index (CI) measured using X ray diffraction is another proxy to reveal the source of the aeolian dust. From the number of oxygen vacancies and the crystallinity index, Nagashima et al (2007b) calculated the ratios of the contributions from three sources, Taklamakan, Siberia, and Japanese river, to the sediments taken from a core in Japan Sea down to 150 ka. It was found that the contribution from Taklamakan dominates in warmer period while that from Siberia is larger in colder period (Fig.…”

Section: The Horizontal Axis For the Natural Quartz (Closed Circlesmentioning

confidence: 99%

“…6), and that the Taklamakan contribution correlates with the isolation at 30ºN in June. (Nagashima et al, 2007b). Yamamoto et al (2010) investigated, the number of oxygen vacancies in quartz of atmospheric deposition to Japanese cities in recent past.…”

Section: The Horizontal Axis For the Natural Quartz (Closed Circlesmentioning

confidence: 99%

The E1’ center in natural quartz: Its formation and applications to dating and provenance researches

Toyoda

2011

Geochronometria

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Quartz is one of the minerals useful for electron spin resonance (ESR) dating. The E 1 ' center is one of well-known paramagnetic defects in crystalline quartz. This center has a unique feature; its intensity increases on heating. An electronic process to explain this increase was found to be controlled not only by the number of oxygen vacancies, which are the precursors, but also by the number of Al hole centers, which depend on the previous radiation dose and on the Al concentration. The maximum intensity on heating is called the heat treated E 1 ' center, which has been posited to correspond to the number of oxygen vacancies in quartz and was found to be correlated with the ages of the host granites (Toyoda and Hattori, 2000). The experimental results on spin-spin relaxation times of the E 1 ' center indicate that external beta and gamma rays create oxygen vacancies in natural quartz rather than alpha or alpha recoil particles (Toyoda et al., 2005). The correlation between the numbers of the oxygen vacancies in quartz and the ages of the host granite made it possible to distinguish the quartz of a sedimentary reservoir from another with different age of crystallization (Toyoda and Naruse, 2002). Quartz fractions extracted from leoss and atmospheric deposition in Japan and from sediments in Japan sea were analyzed by ESR. The temporal change of the contributions from two dust sources in China were discussed in the context of climate change.

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“…Naruse (2003) and Nagashima et al (2007) suggested that the summer polar front migrated from ca. 30 to more than 45°N since the last glacial maximum to the present.…”

Section: Estimation Of Paleo-latitude Using the Carbon Isotopic Compomentioning

confidence: 99%

“…Millennial-scale climatic variability recorded in Chinese loess dust preserved in Japan Sea sediments, suggested the presence of high-frequency variation of the summer monsoon-related rainfall in central to East Asia (Irino and Tada, 2000). Nagashima et al (2007) examined the grain size, flux and provenance of aeolian dust in two sediment cores from northern and southern Japan Sea. These parameters suggested orbital-scale variations related to the insolation change at 30°N in June.…”

Section: Introductionmentioning

confidence: 99%

Carbon isotopic compositions of fatty acids from the Japan Sea and their inferred terrestrial palaeoenvironment in Late Pleistocene

et al. 2011

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Abundance and carbon isotopic composition (δ 13 C) of monocarboxylic fatty acids (n-FA) and n-alkanes in sediments spanning the last 24 kyrs from the southeastern Oki Trough, Japan Sea (core KT96-17, P-2) are presented. The δ 13 C values of n-alkanes, ranging from -36.9 to -25.6‰, are consistent with those (from -44.9 to -23.3‰) measured in sediments of C-3 and L-3 cores, located ca. 10 km southeast from KT96-17, P-2 core. We employed multiple regression analysis for n-C 16-30 FA as a function of latitude and distance from the adjacent landmasses, using the δ 13 C database obtained in sediments of the northeastern Asia. Calculated latitudes from even n-C 20-30 FA ranged from 54 to 37°N over the last 24 kyrs. Although the regression accounts for 59% of the total, the result is strongly supported by other evidences, i.e.: (i) a latitudinal migration from the last glacial period to the Present corresponding to the summer polar front migration observed from loess analysis; (ii) temperature estimated from the latitudes ranged from 2.5 to 15°C, corresponding to those estimated from pollen data; and (iii) C 4 plant evolution at ca. 10 ka estimated from their temperatures, which is consistent with historical and archeological studies.

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Orbital- and millennial-scale variations in Asian dust transport path to the Japan Sea

Cited by 129 publications

References 41 publications

Eolian dust input to the Subarctic North Pacific

Eolian dust input to the Subarctic North Pacific

The E1’ center in natural quartz: Its formation and applications to dating and provenance researches

Carbon isotopic compositions of fatty acids from the Japan Sea and their inferred terrestrial palaeoenvironment in Late Pleistocene

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