研究者詳細 - Stephen P. Obrochta

研究等業績 - 原著論文 - Stephen P. Obrochta

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A new model of Holocene reef initiation and growth in response to sea-level rise on the Southern Great Barrier Reef

Sanborn, K.L., Webster, J.M., Webb, G.E., Braga, J.C., Humblet, M., Nothdurft, L., Patterson, M.A., Dechnik, B., Warner, S., Graham, T., Murphy, R.J., Yokoyama, Y., Obrochta, S.P., Zhao, J.-X., Salas-Saavedra, M.

Sedimentary Geology 397 2020年03月 [査読有り]

研究論文（学術雑誌）国際共著

The fossil record provides valuable data for improving our understanding of both past and future reef resilience and vulnerability to environmental change. The spatial and temporal pattern of the initiation of the Holocene Great Barrier Reef presents a case study of reef response to rapid sea-level rise. Past studies have been limited by the lack of well-dated and closely spaced reef core transects and have not closely examined the composition of the reef-building communities through time. This study presents 80 new high precision U-Th and 5 radiocarbon ages from twelve new cores located along three transects across different geomorphic and hydrodynamic settings of One Tree Reef, southern Great Barrier Reef, to document three distinct stages of Holocene reef development in unprecedented detail. Temporal constraints on changing paleoecological assemblages of coral, coralline algae and associated biota revealed three distinct phases of reef development, consisting of: 1)a fast, shallow and clear-water reef initiation from 8.2 until 8 ka; 2)a shift to slower, deeper and more turbid-water reef growth from 8 to 7 ka; and 3)a return to shallow and rapid branching coral growth in clear-water conditions as the reef "catches up" to sea-level. A minimum lag prior to reef initiation of 700 years was identified, which differs in length depending on reef environment and Pleistocene substrate height. In this new model, reef growth initiated on the topographically lower leeward margin and patch reef, prior to the start of windward margin development, contrary to the traditional reef growth model. While there was a shift to conditions less favorable for reef growth at 8 ka, this did not prevent the slow accretion of more sediment-tolerant coral communities. The majority of the reef reached sea level by similar to 6 ka. This new conceptual model of Holocene reef growth provides new constraints on changes in paleoenvironment that controlled reef community composition and growth trajectories through sea-level rise following inundation. (C) 2019 Elsevier B.V. All rights reserved.

Tsunami deposits refine great earthquake rupture extent and recurrence over the past 1300 years along the Nankai and Tokai fault segments of the Nankai Trough, Japan

Osamu Fujiwara, Akira Aoshima, Toshiaki Irizuki, Eisuke Ono, Stephen P. Obrochta, Yoshikazu Sampei, Yoshiki Sato, Ayumi Takahashi

Quaternary Science Reviews 227 2020年01月 [査読有り]

研究論文（学術雑誌）国内共著

© 2019 Elsevier Ltd Study of prehistoric to medieval-age tsunami deposits along a riverbank site near the eastern Nankai Trough, central Japan, show that, not only did Tokai earthquakes occur with a higher frequency than previously thought, but that contemporaneous ruptures of the Tokai and Nankai fault segments were also more common. The site revealed a ∼1-km long coast-normal cross section of the strand plain and exposed four sandy tsunami deposits, each of which indicates inundation over 2 km inland of the coast. Radiocarbon dating of previously studied and newly discovered deposits in the region indicates a shorter recurrence time for Tokai earthquakes and clarifies their linkage with Nankai earthquakes. We attribute the younger two tsunami deposits to the 1498 and 1096 CE Tokai earthquakes. The older two deposits confirm the occurrence of the Tokai earthquakes in 887 CE and in the latest 7th century. These events are not reliably recorded in historical documents in the Tokai region but were noted in the Nankai area. The 887 CE earthquake likely represents a full-length rupture of the Tokai and Nankai segments, as was the case for the 1707 CE earthquake. Integrated with the previous studies, these new results show that nine Tokai earthquakes occurred over the last 1300 years, the oldest in the latest 7th century, and in 887, 1096, 1361, 1498, 1614, 1707, 1854 and 1944 CE. Recalculated recurrence intervals range from 90 to 265 years. Except for the 1498 Meio Tokai earthquake, the Tokai earthquakes occurred simultaneously with Nankai earthquakes.

Organic carbon accumulation and productivity over the past 130 years in Lake Kawaguchi (central Japan) reconstructed using organic geochemical proxies

Yamamoto, S., Hubert-Ferrari, A., Lamair, L., Miyata, Y., Ochiai, S., Nagao, S., Miyauchi, N., Yoshida, K., Fujiwara, O., Yokoyama, Y., Heyvaert, V.M.A., De Batist, M., Boes, E., Brückner, H., De Rycker, K., Garrett, E., Miyairi, Y., Nakamura, A., Obrochta, S., Riedesel, S., Shishikura, M., Walstra, J., The QuakeRecNankai Team

Journal of Paleolimnology 2020年 [査読有り]

研究論文（学術雑誌）国内共著

A Rapid, Deterministic Age-Depth Modeling Routine for Geological Sequences With Inherent Depth Uncertainty

Lougheed, B.C, Obrochta, S, P

Paleoceanography and Paleoclimatology ( Paleoceanography and Paleoclimatology ) 34 ( 1 ) 122 - 133 2019年01月 [査読有り]

研究論文（学術雑誌）国際共著

本栖湖の湖底堆積物の精密な放射性炭素年代測定が明らかにする富士山の噴火史

Stephen Obrochta, 藤原治, 横山祐典, 宮入陽介

Isotope News 763 22 - 25 2019年06月

研究論文（学術雑誌）国内共著

Mt. Fuji Holocene eruption history reconstructed from proximal lake sediments and high-density radiocarbon dating

Obrochta, S.P., Yokoyama, Y., Yoshimoto, M., Yamamoto, S., Miyairi, Y, Nagano, G., Nakamura, A, Tsunematsu, K, Lamair, L, Hubert-Ferrari, A, Lougheed, B.C., Hokanishi, A., Yasuda, A., Heyvaert, V. M. A., De Batist, M., Fujiwara, O, and the QuakeRecNankai Team

Quaternary Science Reviews 200 395 - 405 2018年10月 [査読有り]

研究論文（学術雑誌）国内共著

Late Weichselian to Holocene history of the Baltic Sea as reflected in ostracod assemblages

Stepanova, A., Obrochta, S.P., Quintana Krupinski, N., Hyttinen, O., Kotilainen, A., Andrén,T.

Boreas 48 761 - 778 2019年07月 [査読有り]

研究論文（学術雑誌）国際共著

湖底堆積物から探る富士山の噴火史 -本栖湖に残されていた未知の噴火の発見-

藤原治, Stephen Obrochta, 横山祐典, 宮入陽介, 常松佳恵

GSJ 地質ニュース 8 ( 3 ) 66 - 69 2019年01月

研究論文（学術雑誌）国内共著

Response of the Great Barrier Reef to sea-level and environmental changes over the past 30,000 years

Jody M. Webster, Juan Carlos Braga, Marc Humblet, Donald C. Potts, Yasufumi Iryu, Yusuke Yokoyama, Kazuhiko Fujita, Raphael Bourillot, Tezer M. Esat, Stewart Fallon, William G. Thompson, Alexander L. Thomas, Hironobu Kan, Helen V. McGregor, Gustavo Hinestrosa, Stephen P. Obrochta, Bryan C. Lougheed

Nature Geoscience 11 426 - 432 2018年05月 [査読有り]

研究論文（学術雑誌）国際共著

A sea-level plateau preceding the Marine Isotope Stage 2 minima revealed by Australian sediments

Ishiwa, T., Yokoyama, Y., Okuno, J., Obrochta, S.P., Uehara, K., Ikehara, M., Miyairi, Y.

Scientific Reports 9 ( 1 ) 2019年01月 [査読有り]

研究論文（学術雑誌）国内共著

Coring induced sediment fabrics at IODP Expedition 347 Sites M0061 and M0062 identified by anisotropy of magnetic susceptibility (AMS): criteria for accepting palaeomagnetic data

Snowball, I., Almqvist, B., Lougheed, B C., Wiers, S., Obrochta, S., Herrero-Bervera, E.

Geophysical Journal International 217 ( 2 ) 1089 - 1107 2019年02月 [査読有り]

研究論文（学術雑誌）国際共著

Use of high-resolution seismic reflection data for paleogeographical reconstruction of shallow Lake Yamanaka (Fuji Five Lakes, Japan)

Lamair, L., Hubert-Ferrari, A., Yamamoto, S., Fujiwara, O., Yokoyama, Y., Garrett, E., De Batist, M., Heyvaert, V.M.A., Boes, Evelien, Nakamura, Atsunori, Obrochta, Stephen, Shishikura, Masanobu, Miyairi, Yosuke, Brückner, Helmut, Ono, Eisuke, Riedesel, Svenja, De Rycker, Koen, Sato, Yoshiki, Walstra, Jan

Palaeogeography, Palaeoclimatology, Palaeoecology 514 233 - 250 2019年01月 [査読有り]

研究論文（学術雑誌）国際共著

Microbial biomass turnover times and clues to cellular protein repair in energy-limited deep Baltic Sea sediments

Mahtre, S, Kaufmann, S, Marshall, I.P.G., Obrochta, S.P., Andren, T., Jørgensen, B.B, Lomstein, B.A.

FEMS Microbiology Ecology 95 ( 6 ) 2019年05月 [査読有り]

研究論文（学術雑誌）国際共著

Assessment of northeastern Japan tree-ring oxygen isotopes for reconstructing early summer hydroclimate and spring Arctic Oscillation

Wataru Sakashita, Yusuke Yokoyama, Hiroko Miyahara, Takahiro Aze, Stephen P. Obrochta, Motonari Ohyama, and Hitoshi Yonenobu

Geochemistry, Geophysics, Geosystems 19 ( 3520 ) 3528 2018年09月 [査読有り]

研究論文（学術雑誌）国内共著

The undatables: Quantifying uncertainty in a highly expanded Late Glacial - Holocene sediment sequence recovered from the deepest Baltic Sea basin - IODP Site M0063

Stephen P. Obrochta, Thomas Andrén, Szilárd Z. Fazeka, Bryan C. Lougheed, Ian Snowball, Yusuke Yokoyama, Yosuke Miyairi, Reisuke Kondo, Aarno, T. Kotilainen, Outi Hyttinen, and Annick Fehr

Geochemistry, Geophysics, Geosystems 18 2017年02月 [査読有り]

研究論文（学術雑誌）国際共著

Bulk sediment 14C dating in an estuarine environment - How accurate can it be?

Bryan C. Lougheed, Stephen P. Obrochta, Conny Lenz, Anette Mellström, Brett Metcalfe, Raimund Muscheler, Maja Rinholdsson, Ian Snowball Lovisa Zillén

Paleoceanography 32 2017年02月 [査読有り]

研究論文（学術雑誌）国際共著

MatCal: Open Source Bayesian 14C Age Calibration in Matlab

Bryan C. Lougheed, Stephen P. Obrochta

Journal of Open Research Software 4 ( 1 ) 2016年11月 [査読有り]

研究論文（学術雑誌）国際共著

Relationship between the Northern Pacific Gyre Oscillation and tree-ring cellulose oxygen isotopes in northeastern Japan

Sakasita, W., Miyahara, H., Yokoyama, Y., Axe, T., Obrochta, S.P., and Nakatsuka, T.

Geoscience Letters 4 ( 29 ) 2017年12月 [査読有り]

研究論文（学術雑誌）国内共著

Volcanic influence of Mt. Fuji on the watershed of Lake Motosu and its impact on the lacustrine sedimentary record

Laura Lamair, Aurélia Hubert-Ferrari, Yamamoto Shinya, Meriam El Ouahabi, Jacqueline Vander Auwera, Stephen P. Obrochta, Evelien Boes, Atsunori Nakamura, Osamu Fujiwara, Masanobu Shishikura, Sabine Schmidt, Giuseppe Siani, Yosuke Miyairi, Yusuke Yokoyama, Marc De Batist, Vanessa M.A. Heyvaert, and the QuakeRecNankai Team

Sedimentary Geology 363 200 - 220 2018年01月 [査読有り]

研究論文（学術雑誌）国際共著

Seasonal hypoxia was a natural feature of the coastal zone in the Little Belt, Denmark, during the past 8ka

van Helmond, Niels A.G.M., Quintana Krupinski, Nadine B., Lougheed, Bryan C., Obrochta, Stephen P., Andrén, Thomas, Slomp, Caroline P.,

Marine Geology 387 45 - 57 2017年05月 [査読有り]

研究論文（学術雑誌）国際共著

Holocene Refreshening and Reoxygenation of a Bothnian Sea Estuary Led to Enhanced Phosphorus Burial

Nikki Dijkstra, Nadine B. Quintana Krupinski, Masako Yamane, Stephen P. Obrochta, Yosuke Miyairi, Yusuke Yokoyama, Caroline P. Slomp

Estuaries and Coasts 41 139 - 157 2017年04月 [査読有り]

研究論文（学術雑誌）国際共著

Climate variability and ice-sheet dynamics during the last three glaciations

Stephen P. Obrochta, Thomas J. Crowley, James E.T. Channell, David A. Hodell, Paul A. Baker, Arisa Seki, Yusuke Yokoyama

Earth and Planetary Science Letters 406 198 - 212 2014年11月 [査読有り]

研究論文（学術雑誌）国際共著

Conversion of GISP2-based sediment core age models to the GICC05 extended chronology, Quaternary Geochronology

Stephen P. Obrochta, Yusuke Yokoyama, Jan Morén, Thomas J. Crowley

Quaternary Geochronology 20 1 - 7 2014年04月 [査読有り]

研究論文（学術雑誌）国際共著

Sedimentary environmental change induced from late Quaternary sea-level change in the Bonaparte Gulf, northwestern Australia

Ishiwa, T., Yokoyama, Y., Miyairi, Y., Ikehara, M., Obrochta, S.P.

Geoscience Letters 3 ( 1 ) 2 - 11 2016年12月 [査読有り]

研究論文（学術雑誌）国内共著

Holocene stratigraphy of the Ångermanälven River estuary, Bothnian Sea

Hyttinen, O., Kotilainen, A. T., Virtasalo, J. J., Kekäläinen, P., Snowball, I., Obrochta, S., Andrén, T.

Geo-Marine Letters 37 273 - 288 2016年12月 [査読有り]

研究論文（学術雑誌）国際共著

Reappraisal of sea-level lowstand during the Last Glacial Maximum observed in the Bonaparte Gulf sediments, northwestern Australia

Takeshige Ishiwaa, Yusuke Yokoyamaa, Yosuke Miyairi, Stephen Obrochta, Takenori Sasaki, Akihisa Kitamura, Atsushi Suzuki, Minoru Ikehara, Ken Ikehara, Katsunori Kimoto, Julien Bourget, Hiroyuki Matsuzaki

Quaternary International 397 373 - 379 2016年03月 [査読有り]

研究論文（学術雑誌）国内共著

Relationship between early summer precipitation in Japan and the El Niño-Southern and Pacific Decadal Oscillations over the past 400 years

Wataru Sakashita, Yusuke Yokoyama, Hiroko Miyahara, Yasuhiko T. Yamaguchi, Takahiro Aze, Stephen P. Obrochta, Takeshi Nakatsuka

Quaternary International 397 ( 0 ) 1 - 7 2016年03月 [査読有り]

研究論文（学術雑誌）国際共著

Determining the likelihood of pauses and surges in global warming

Andrew P. Shurer, Gabriele C. Hegerl, Stephen P. Obrochta

Geophysical Research Letters 42 ( 12 ) 2015年06月 [査読有り]

研究論文（学術雑誌）国際共著

Exposure age and ice-sheet model constraints on Pliocene East Antarctic ice sheet dynamics

Masako Yamane, Yusuke Yokoyama, Ayako Abe-Ouchi, Stephen Obrochta, Fuyuki Saito, Kiichi Moriwaki & Hiroyuki Matsuzaki

Nature Communications 6 ( 7016 ) 2015年04月 [査読有り]

研究論文（学術雑誌）国際共著

Paleoenvironmental evolution of the Baltic Sea Basin through the last glacial cycle

Thomas Andrén, Bo Jørgensen, Carol Cotterill, Stephen P. Obrochta et al.

IODP Preliminary Report 347 2015年02月 [査読有り]

研究論文（学術雑誌）国際共著

Recent global temperature "plateau" in the context of a new proxy reconstruction

Thomas J. Crowley, Stephen P. Obrochta, Junhua Liu

Earth's Future 2 ( 5 ) 281 - 294 2014年05月 [査読有り]

研究論文（学術雑誌）国際共著

Larger CO2 source at the equatorial Pacific during the last deglaciation

Kaoru Kubota, Yusuke Yokoyama, Tsuyoshi Ishikawa, Stephen P. Obrochta, Atsushi Suzuki

Scientific Reports 4 2014年06月 [査読有り]

研究論文（学術雑誌）国際共著

Melting history of the Patagonian Ice Sheet during Termination I inferred from marine sediments

Kazuyo Shiroya, Yusuke Yokoyama, Stephen P. Obrochta, Naomi Harada, Yosuke Miyairi, Hiroyuki Matsuzaki

Geochemical Journal 47 ( 2 ) 107 - 117 2013年11月 [査読有り]

研究論文（学術雑誌）国際共著

Holocene sea-level change and Antarctic melting history derived from geological observations and geophysical modeling along the Shimokita Peninsula, northern Japan

Yokoyama Yusuke, Jun'ichi Okuno, Yosuke Miyairi, Stephen P. Obrochta, Nobuhiro Demboya, Yoshinori Makino, Hodaka Kawahata

Geophysical Research Letters 39 ( 13 ) 2012年07月 [査読有り]

研究論文（学術雑誌）国際共著

A re-examination of evidence for the North Atlantic "1500-year cycle" at Site 609

Stephen P. Obrochta, Hiroko Miyahara, Yusuke Yokoyama Thomas J. Crowley

Quaternary Science Reviews 55 23 - 33 2012年11月 [査読有り] [招待有り]

研究論文（学術雑誌）国際共著

Late Holocene Asian monsoon variations recorded in Lake Rara sediment, western Nepal

Atsunori Nakamura, Yusuke Yokoyama, Hideaki Maemoku, Hiroshi Yagi, Makoto Okamoto, Hiromi Matsuoka, Nao Miyake, Toshiki Osaka, Hirofumi Teramura, Danda Pani Adhikari, Vishnu Dangol, Yosuke Miyairi, Stephen P. Obrochta, Hiroyuki Matsuzaki

Journal of Quaternary Science 27 ( 2 ) 125 - 128 2012年02月 [査読有り]

研究論文（学術雑誌）国際共著

Data Report: Variations in Bulk Carbonate Content, Hole 1198A, 14.52-41.13 and 67.42-100.12 mbsf

Stephen P. Obrochta, Albert C. Hine

Proceedings ODP Scientific Results 194 1 - 9 2007年02月 [査読有り]

研究論文（学術雑誌）国際共著

Proceedings of the Integrated Ocean Drilling Program

Channel, James E.T., Tokiyuki Sato, Toshiya Kanamatsu, Rudiger Stein, Mitch J. Malone, Carlos A., Alvarez-Zarikian, Stephen P. Obrochta et al.

Proceedings of the Integrated Ocean Drilling Program 303/306 2006年01月 [査読有り]

研究論文（学術雑誌）国際共著

Expeditions 303 and 306 Monitor Miocene- Quaternary Climate in the North Atlantic

Channel, James E.T., Toshiya Kanamatsu, Tokiyuki Sato, Rudiger Stein, Carlos A., Alvarez-Zarikian, Mitch J. Malone, Stephen P. Obrochta et al.

Scientific Drilling 2 4 - 10 2006年01月 [査読有り]

研究論文（学術雑誌）国際共著

Hardbottom development and significance to the sediment-starved west-central Florida inner continental shelf

Stephen P. Obrochta, David S. Duncan, Gregg R. Brooks

Marine Geology 200 ( 1-4 ) 291 - 306 2003年09月 [査読有り]

研究論文（学術雑誌）国際共著

MERIDIONAL MIGRATIONS of the INTERTROPICAL CONVERGENCE ZONE during the LAST DEGLACIATION in the TIMOR SEA DETECTED by EXTENSIVE RADIOCARBON DATING

Nemoto K.

Radiocarbon ( Radiocarbon ) 66 ( 6 ) 1958 - 1967 2024年12月 [査読有り]

研究論文（学術雑誌）

At the Intertropical Convergence Zone (ITCZ), the northern and southern Tradewinds converge, and this region is characterized by low atmospheric pressure and high precipitation. The climate in the Timor Sea is characterized by seasonal precipitation changes driven by meridional migrations of the ITCZ and the monsoonal front. The ITCZ shifts in response to changes in the thermal balance between the northern and southern hemispheres. Thus, reconstruction of paleo-precipitation in the Timor Sea is expected to reveal past changes in both regional and global climate, the latter through inference of the ITCZ position. To reconstruct paleo-precipitation in the Timor Sea, we performed extensive radiocarbon analysis on both planktonic foraminifera and total organic carbon (TOC), which is derived from terrestrial and marine sources. Increased precipitation enhances the fraction of relatively old, terrestrial carbon to the core site, which in turn increases the difference between the ages of TOC and planktonic foraminifera. Variations in radiocarbon ages reveal that during northern hemisphere cooling intervals such as Heinrich Stadial 1 and the Younger Dryas, the ITCZ was in a southern position, thus increasing precipitation in the Timor Sea. However, the Timor Sea was dryer during the Bølling-Allerød warming as the ITCZ shifted northward.

A Lake at the Mt. Fuji (Lake Motosu) Recording Prolonged Negative Arctic Oscillation as Reduction of Aeolian Dust Due To Westerly Pathways During the Holocene

Nemoto K.

Paleoceanography and Paleoclimatology ( Paleoceanography and Paleoclimatology ) 39 ( 9 ) 2024年09月

研究論文（学術雑誌）

Abstract

East Asia is a major source of dust accounting for 20% of the global dust emission. Work on reconstructing past changes in dust transport in East Asia is complicated by difficulties in distinguishing local sedimentation from aerial material and lack of suitable material for age determination. Here, we address these issues and present a new dust proxy record from Lake Motosu, located on the Pacific side of Japan. The record is anchored by a high‐quality tephra and radiocarbon chronology. Because Lake Motosu is situated in a quartz‐free basaltic volcanic province, all quartz deposited in the lake is likely to be aerially sourced, and variations in quartz content should reflect past changes in dust transport. Our new record detects a low dust deposition event from 3.0 to 2.0 ka. This event corresponds to elevated sea surface temperature in the Sea of Japan and climate conditions similar to a negative phase of the Arctic Oscillation, indicating an association with the weakened Westerlies and with less frequent dust storms in the source region. The increase in spatial resolution of past dust transport reconstructions will further improve our understanding of the mechanism related to dust emission from East Asia.

Development of an automated extraction and radiocarbon dating method for fossil pollen deposited in lake Motosu, Japan

Ota K.

Quaternary Science Advances ( Quaternary Science Advances ) 15 100207 - 100207 2024年09月 [査読有り]

研究論文（学術雑誌）

An initial attempt to date Pleistocene marine terraces in the south coast of Japan using in situ cosmogenic <sup>10</sup>Be and <sup>26</sup>Al

Yokoyama Y.

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms ( Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms ) 535 255 - 260 2023年02月

研究論文（学術雑誌）

Occurrence mode of Holocene tsunami overwash controlled by the geomorphic development along the eastern Nankai Trough, central Japan

Fujiwara O.

Quaternary Science Reviews ( Quaternary Science Reviews ) 292 107639 - 107639 2022年09月 [査読有り]

研究論文（学術雑誌）

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