研究者詳細 - 大橋　勝文

論文 - 大橋　勝文

分割表示 >> ／全件表示 9 件中 1 - 9 件目

大橋勝文, 中山智喜 . ひまわり8号の画像解析による桜島噴火後の火山灰追尾 . エアロゾル研究37 ( 1 ) 57 - 62 2022年3月招待査読

Masafumi Ohashi, Akihiro Kameda, Osamu Kozan, Masahiro Kawasaki, Windy Iriana, Kenichi Tonokura, Daisuke Naito and Kayo Ueda . Correlation of publication frequency of newspaper articles with environment and public health issues in fire-prone peatland regions of Riau in Sumatra, Indonesia . Humanities and Social Sciences Communications8 ( 1 ) 1 - 8 2021年12月査読国際共著

Muhammad Arif Rahman, Devis Styo Nugroho, Manabu D. Yamanaka, Masahiro Kawasaki, Osamu Kozan, Masafumi Ohashi, Hiroyuki Hashiguchi, Shuichi Mori . Weather radar detection of planetary boundary layer and smoke layer top of peatland fire in Central Kalimantan, Indonesia . Scientific reports11 367 - 375 2021年1月査読

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Nature.com

During the dry period of August–October 2015, a C-band Doppler weather radar of the BMKG station in a fire-prone peatland area, Palangka Raya, detected echoes with reflectivity values between − 19 and + 34 dBZ at a height below 2–3 km and a slant range of 100 km. The MERRA-2/NASA atmospheric reanalysis database is used to obtain the vertical profiles of refractive index and equivalent potential temperature of the air. The temporal variation of the radar image is due to the tropical diurnal cycle of planetary boundary layer formation, which is consistent with the results of the database analysis. The echo images are discussed in terms of Bragg scattering of microwaves at the top of the planetary boundary layer. Weather radar monitoring of the fire smoke layer-top images has a potential feasibility to support real-time management of peatland fires.

DOI： 10.1038/s41598-020-079486-6

Xiu-Chun Qin, Tomoki Nakayama, Yutaka Matsumi, Masahiro Kawasakia, Ryoichi Imasu, Isamu Morino, Yoshihiro Tanaka, Shigeyuki Ishidoya, Kenta Sato, Masafumi Ohashi . Observation of column-averaged molar mixing ratios of carbon dioxide in Tokyo . Atmospheric Environment: X2 1 - 8 2019年4月査読

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier

The metropolitan area of Tokyo, the capital of Japan, emits a large amount of carbon dioxide (CO2), an anthropogenic greenhouse gas. We measured the day-time column-averaged dry-air molar mixing ratios of atmospheric CO2, XCO2, in the central area of Tokyo during September 2014 – August 2016 using a desktop optical spectrum analyzer. The observed seasonal cycle is compared with the seasonal cycle that is observed at the Total Carbon Column Observing Network (TCCON) site in Tsukuba, which is located 60 km to the northeastern direction of Tokyo. The differences in XCO2 between the two sites are high (∼5 ppm) during December – February and low (∼0.5 ppm) during June – September. The characteristic variations of XCO2 in Tokyo are interpreted in terms of local emission sources and surface meteorological data, by referring to the variations in the concentrations of surface CO2. The sharp peaks in XCO2 at both the Tokyo and Tsukuba sites in July are interpreted in terms of local air retention in the areas, as indicated by the aircraft profiles and wind-flow forward trajectory calculations. Finally, we compare the ground-based column measurements with the top-down satellite column observations.

DOI： 10.1016/j.aeaoa.2019.100022

Scopus

Windy Iriana, Kenichi Tonokura, Gen Inoue, Masahiro Kawasaki Osamu Kozan, Kazuki Fujimoto, Masafumi Ohashi, Isamu Morino, Yu Someya, Ryuichi Imasu, Muhammad Arif Rahman & Dodo Gunawan . Ground-based measurements of column-averaged carbon dioxide molar mixing ratios in a peatland fire-prone area of Central Kalimantan, Indonesia . Scientific Reports2018 ( 8 ) 1 - 7 2018年5月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Nature Publishing Group

Tropical peatlands in Indonesia have been disturbed over decades and are a source of carbon dioxide
(CO2) into the atmosphere by peat respiration and peatland fire. With a portable solar spectrometer,
we have performed measurements of column-averaged CO2 dry-air molar mixing ratios, XCO2, in
Palangka Raya, Indonesia, and quantify the emission dynamics of the peatland with use of the data for
weather, fire hotspot, ground water table, local airport operation visibility and weather radar images.
Total emission of CO2 from surface and underground peat fires as well as from peatland ecosystem is
evaluated by day-to-day variability of XCO2. We found that the peatland fire and the net ecosystem CO2
exchange contributed with the same order of magnitude to the CO2 emission during the non-El Niño
Southern Oscillation year of July 2014-August 2015.

DOI： 10.1038/s41598-018-26477-3

Scopus

uthor(s): Xiu-Chun Qin; Tomoki Nakayama; Yutaka Matsumi; Masahiro Kawasaki; Akiko Ono; Sachiko Hayashida; Ryoichi Imasu; Li-ping Lei; Isao Murata; Takahiro Kuroki; Masafumi Ohashi . Ground-based measurement of column-averaged mixing ratios of methane and carbon dioxide in the Sichuan Basin of China by a desktop optical spectrum analyzer . JOURNAL OF APPLIED REMOTE SENSING12 ( 1 ) 12002 - 12014 2017年9月査読

Xiuchun Qin, Liping Lei, Zhonghua He, Zhao-Cheng Zeng, Masahiro Kawasaki, Masafumi Ohashi, YutakaMatsumi . Preliminary Assessment of Methane Concentration: Variation Observed by GOSAT in China . Advances in Meteorology2015 1 - 11 2015年9月査読

HIDEMORI Takehiro, NAKAYAMA Tomoki, MATSUMI Yutaka, KINUGAWA Takashi, YABUSHITA Akihiro, OHASHI Masafumi, MIYOSHI Takao, IREI Satoshi, TAKAMI Akinori, KANETASU Naoki, YOSHINO Ayako, SUZUKI Ryota, YUMOTO Yayoi, HATAKEYANA Shiro . Characteristics of atmospheric aerosols containing heavy metalsmeasured on Fukue Island, Japan . Atmospheric Environment97 447 - 455 2014年11月査読

Qin Xiu-chun, Lei Li-ping, Masahiro, Kawasaki, Ohashi, Masafumi, Kuroki, Takahiro, Zeng Zhao-cheng, Zhang Bing . Retrieval and Analysis of Atmospheric XCO2 UsingGround-Based Spectral Observation . SPECTROSCOPY AND SPECTRAL ANALYSIS ・Chinese Optical Society34 ( 7 ) 1729 - 1735 2014年7月査読

　前のページ - 次のページ　

<大橋 勝文>

論文 - 大橋 勝文

<大橋　勝文>

論文 - 大橋　勝文