Hodaka Kawahata

Datos Biográficos

ID4131681
NOMBREHodaka Kawahata
NOMBRESHodaka
APELLIDOKawahata
FIRMAKAWAHATA H
AFILIACIONESNational Institute of Advanced Industrial Science and Technology
ORCID0000-0003-4236-7356
VERIFICADOSí
TOTAL DE OBRAS8
TOTAL DE CITAS0
TOTAL COMO AUTOR8
TOTAL COMO EDITOR0
PRIMER AÑO DE PUBLICACIÓN2002
AÑO MÁS RECIENTE DE PUBLICACIÓN2025
ÍNDICE H0

  • Year History of Important Climate Events Experienced by Ancestors of the Most of Modern Japanese

    Open AccessHodaka KawahataARTICLEJournal of Geography (Chigaku…2025

    Biologically, human beings are termed Homo sapiens. The first was born in Africa about 200,000 years ago. Some groups migrated from there about 60,000 years ago under a humid climate. The first ancestors of the modern Japanese arrived in the Japanese archipelago about 37,500 years ago. The ancestors of the most of modern Japanese experienced 10 innovative events: (1) First immigration of Homo sapiens to Japan during the Paleolithic period, (2) In…

  • Historical trend of polycyclic aromatic hydrocarbons in a sediment core from Osaka Bay during the Meghalayan

    Open AccessKai Nils Nitzsche, Naoto F Ishikawa et al.ARTICLEThe Holocene2024

    Polycyclic aromatic hydrocarbons (PAHs) are produced by incomplete combustion of biomass and fossil fuel, yet PAHs have been rarely analyzed in coastal sediment cores as a tracer for human activities before industrialization. The aim of this study was to assess if the historical trend of PAHs can be related to past human activities. To this end, we have determined the concentrations of PAHs in a 9 m-long sediment core from Osaka Bay, which record…

  • Climatic change and its influence on human society in western Japan during the Holocene

    Open AccessHodaka Kawahata, Megumi Matsuoka et al.ARTICLEQuaternary International2017

  • Centennial- to millennial-scale change of Holocene shallow marine environments recorded in ostracode fauna, northeast Japan

    Open AccessToshiaki Irizuki, Miki Kobe et al.ARTICLEQuaternary Research2015

    Using the record of shallow-marine ostracode fauna and sediment grain size data from an 865-cm-long piston core obtained from Mutsu Bay, northeast Japan, paleoceanographic changes of the bay were determined at high resolution for the early to middle Holocene. Changes in the relative frequencies of several species showed periodicities of 1300–1800 years similar to Bond cycles. At around 10,300 cal yr BP and again, at 9500–9300 cal yr BP, cold wate…

  • Using foraminiferal Mg/Ca ratios to detect an ocean-warming trend in the twentieth century from coastal shelf sediments in the Bungo Channel, southwest Japan

    Open AccessMichinobu Kuwae, Yuichi Hayami et al.ARTICLEThe Holocene2009Referencias: 1

    To assess abnormal warming of temperature in southwest Japan's coastal seas during the twentieth century, we developed a 200 yr interannually resolved record of planktonic and benthic foraminiferal Mg/Ca-based temperature using neritic coastal sediment cores. The winter to late spring bottom temperature (50 m) record, based on benthic foraminiferal ( Nonion japonicum) Mg/Ca ratios in the Bungo Channel (BC), showed consistent variation with observ…

  • Radiocarbon Marine Reservoir Ages in the Northwestern Pacific Off Hokkaido Island, Japan, During the Last Deglacial Period

    Open AccessKen'ichi Ohkushi, Masao Uchida et al.ARTICLERadiocarbon2007Referencias: 15

    We measured radiocarbon ages of planktic foraminifera in 4 sediment cores from the northwestern Pacific region off northern Japan in order to estimate marine reservoir ages during the B⊘lling-Aller⊘d period. The ages of deglacial tephra markers from 2 Japanese source volcanoes identified in these sediment cores had been previously estimated from 14 C ages of terrestrial charcoal and buried forests. By comparing the foraminiferal and tephra ages, …

  • Amino acids and hexosamines in the Hess Rise core during the past 220,000 years

    Open AccessLallan P Gupta, Hodaka KawahataARTICLEQuaternary Research2003

    Core sediment samples collected from the Hess Rise, North Pacific, were analyzed for 20 common amino acids (AA) and two hexosamines (HA) to understand the relation between glacial–interglacial variations and deposition/preservation of sedimentary organic matter (OM). The sediments are predominantly carbonaceous (carbonates 35–80%). AA-based parameters—aspartic acid/glycine ratio and serine+threonine relative mole content—suggest that calcareous p…

  • Fluctuations in Terrestrial–Marine Environments in the Western Equatorial Pacific during the Late Pleistocene

    Open AccessHodaka Kawahata, Rena Maeda et al.ARTICLEQuaternary Research2002

    Large heat storage capacity in the western equatorial Pacific has played an important role in modulating global climate. The fluctuation in pollen and spore abundances, together with organic matter (OM) and lithogenics sedimentation, was investigated to reconstruct terrestrial and marine environmental change around New Guinea during the Late Pleistocene. Although appreciable contribution from Indonesian Maritime Continent was expected, the majori…