Osamu Abe

Nagoya University

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Maki Morimoto

Gifu University

T. Nakamura

National Institute of Technology, Tomakomai College

Yasufumi Iryu

Tohoku University

Kenji Kosugi

National Research Institute for Earth Science and Disaster Resilience

Hiroyuki Hirashima

National Research Institute for Earth Science and Disaster Resilience

Atsushi Sato

Tohoku Institute of Technology

Toshiro Saino

Japan Agency for Marine-Earth Science and Technology

Satoru Yamaguchi

National Research Institute for Earth Science and Disaster Resilience

Shigeto Mochizuki

National Research Institute for Earth Science and Disaster Resilience

Ryuji Asami

Tohoku University

Cooperative Institutions

Nagoya University

The University of Tokyo

Hokkaido University

National Research Institute for Earth Science and Disaster Resilience

Japan Agency for Marine-Earth Science and Technology

Tohoku University

Japan Fisheries Research and Education Agency

Meteorological Research Institute

Japan Meteorological Agency

Chinese Academy of Sciences

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Comparison of carbon cycle between the western Pacific subarctic and subtropical time-series stations: highlights of the K2S1 project

Journal of Oceanography (2017)

Makio C. Honda Masahide Wakita Kazuhiko Matsumoto Tetsuichi Fujiki Eko Siswanto

Subarctic climate

Biogeochemistry

Biological pump

10.1007/s10872-017-0423-3

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Citations (35)

Aeolian dust experiment on climate impact: An overview of Japan–China joint project ADEC

Global and Planetary Change (2006)

Masato Mikami Guangyu Shi Itsushi Uno Sadayo Yabuki Yasunobu Iwasaka

Asian Dust

Dust storm

Mineral dust

10.1016/j.gloplacha.2006.03.001

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Citations (145)

An adjustment for kinetic growth metamorphism to improve shear strength parameterization in the SNOWPACK model

Cold Regions Science and Technology (2009)

Hiroyuki Hirashima Osamu Abe Atsushi Sato Michael Lehning

Snowpack

Shear Strength

10.1016/j.coldregions.2009.05.001

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Citations (23)

Within- and inter-shell variations of carbon and oxygen isotope composition in Permian brachiopod shells from the Indochina terrane in Thailand

Annual Meeting of the Geological Society of Japan The 122nd Annual Meeting(2015' Nagano) (2015)

Mamoru Takizawa Techapinawat Lapone Hideko Takayanagi Thasinee Charoentitirat Ryuji Asami

Carbon fibers

10.14863/geosocabst.2015.0_599

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Comment on bg-2020-448

Hana Jurikova Osamu Abe Fuh‐Kwo Shiah Mao‐Chang Liang

Abstract. The South China Sea (SCS) is the world's largest marginal sea, playing an important role in the regional biogeochemical cycling of carbon and oxygen. However, its overall metabolic balance, primary production rates and links to East Asian Monsoon forcing remain poorly constrained. Here, we report seasonal variations in triple oxygen isotope composition (¹⁷Δ) of dissolved O₂, a tracer for biological O₂, gross primary production (GP; inferred from δ¹⁷O and δ¹⁸O values) and net community production (NP; evaluated from oxygen–argon ratios) from the SouthEast Asian Time-series Study (SEATS) in the SCS. Our results suggest rather stable mixed-layer mean GP rates of ∼ 1500 ± 350 mg C m⁻² d⁻¹ and mean NP of ∼ −13 ± 20 mg C m⁻² d⁻¹ during the summer southwest monsoon season. These values indicate, within uncertainties and variabilities observed, that the metabolism of the system was in net balance. During months influenced by the stronger northeast monsoon forcing, the system appears to be more dynamic and with variable production rates, which may shift the metabolism to net autotrophy (with NP rates up to ∼ 140 mg C m⁻² d⁻¹). Furthermore, our data from the deeper regions show that the SCS circulation is strongly affected by monsoon wind forcing, with a larger part of the water column down to at least 400 m depth fully exchanged during a winter, suggesting the ¹⁷Δ of deep O₂ as a valuable novel tracer for probing mixing processes. Altogether, our findings underscore the importance of monsoon intensity on shifting the carbon balance in this warm oligotrophic sea and on driving the regional circulation pattern.

Life span

Linear span

10.5194/bg-2020-448-rc1

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Process of the Tsushima Current formation revealed by ADCP measurements in summer

Journal of Oceanography (1996)

Osamu Katoh Kazuyuki Teshima Osamu Abe Hitoshi Fujita Kuniaki Miyaji

China sea

Continental Margin

10.1007/bf02239051

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Citations (44)

A striped pattern of snowfall and snow cover

Annals of Glaciology (1993)

Yasuaki Nohguchi Takashi Ikarashi Osamu Abe Atsushi Sato

A striped pattern can be seen by spraying ink on a vertical wall of a snow pit to observe the layered structure of a snow cover. This pattern is caused by variations of snowfall in time, particularly pauses in snowfall, and its structure is related to a kind of fractal. In this paper, we consider snowfall and snow cover from a viewpoint of fractals and show that the layered structure of snow cover is a record of fractals on atmospheric-turbulence phenomena through the time variation of snowfall.

Snow field

Snow line

10.1017/s0260305500011216

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Citations (1)

Snow Shear Strength Under Different Stress Rates and Avalanche Release

2010 International Snow Science Workshop (2010)

Pavel Chernous Nikolay Barashev Yu. V. Fedorenko Evgeniy Podolsky Osamu Abe

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Chemical composition of winter precipitation of the Shinjo City, Yamagata Prefecture. 3. Particulate materials included in the winter precipitation.

Nobutaka OKUMURA Fumitaka Yanagisawa Osamu Abe

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Monte Carlo simulations of spectral albedo for artificial snowpacks composed of spherical and nonspherical particles

Applied Optics (2006)

Tomonori Tanikawa Teruo Aoki Masahiro Hori Akihiro Hachikubo Osamu Abe

The optical properties of snowpacks composed of spherical and nonspherical particles artificially prepared in a cold laboratory are investigated by measuring spectral albedos. The measured spectral albedo in the spectral region lambda=0.35-2.5 microm is compared with the theoretically calculated albedo, for which a Monte Carlo radiative transfer model is employed for multiple scattering combined with the Mie theory and the ray-tracing technique for single scattering by snow particles. Since the spherical particles are a little aggregate, the effects of a cluster of the spheres on snow albedo are examined using a generalized multiparticle Mie-solution model [Appl. Opt. 34, 4573 (1995); J. Quant. Spectrosc. Radiat. Transf. 79-80, 1121 (2003)]. The snow albedo of a cluster of the spheres can be represented with that of the singe sphere slightly larger than its component of the cluster in case of small grains. The observed albedos for the spherical snow particles agree with the theoretically calculated ones for the snow grain size measured in the snow pit work. The snow albedos for the nonspherical particles, which were dendrites, are influenced by the branch width and the branch length, based on a comparison of the theoretically calculated albedo by using circular cylindrical snow particles and the observed albedo. The snow albedo in the near-infrared region depends on the branch width only when the branch length is sufficiently greater than the branch width. The comparison between the spherical and nonspherical snow particles indicates that the spectral albedo of the nonspherical particles can be represented by using an equal volume-area ratio sphere.

Albedo (alchemy)

10.1364/ao.45.005310

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Citations (22)