Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-833-2018 |
Vertical distributions of N2O isotopocules in the equatorial stratosphere | |
Toyoda, Sakae1; Yoshida, Naohiro1,2; Morimoto, Shinji3; Aoki, Shuji3; Nakazawa, Takakiyo3; Sugawara, Satoshi4; Ishidoya, Shigeyuki5; Uematsu, Mitsuo6; Inai, Yoichi3; Hasebe, Fumio7; Ikeda, Chusaku8; Honda, Hideyuki8; Ishijima, Kentaro9 | |
2018-01-23 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
![]() |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:2页码:833-844 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | Vertical profiles of nitrous oxide (N2O) and its isotopocules, isotopically substituted molecules, were obtained over the Equator at altitudes of 16-30 km. Whole air samples were collected using newly developed balloonborne compact cryogenic samplers over the eastern equatorial Pacific in 2012 and Biak Island, Indonesia, in 2015. They were examined in the laboratory using gas chromatography and mass spectrometry. The mixing ratio and isotopocule ratios of N2O in the equatorial stratosphere showed a weaker vertical gradient than the previously reported profiles in the subtropical and mid-latitude and high-latitude stratosphere. From the relation between the mixing ratio and isotopocule ratios, further distinct characteristics were found over the Equator: (1) observed isotopocule fractionations (epsilon values) in the middle stratosphere (25-30 km or [N2O] < ca. 260 nmol mol(-1)) are almost equal to epsilon values reported from broadband photolysis experiments conducted in the laboratory; (2) epsilon values in the lower stratosphere (< ca. 25 km or [N2O] > ca. 260 nmol mol(-1)) are about half of the experimentally obtained values, being slightly larger than those observed in the mid-latitude and high-latitude lower stratosphere ([N2O] > ca. 170 nmol mol(-1)). These results from the deep tropics suggest the following. (i) The timescale for quasi-horizontal mixing between tropical and mid-latitude air in the tropical middle stratosphere is sufficiently slow relative to the tropical upwelling rate that isotope fractionation approaches the Rayleigh limit for N2O photolysis. (ii) The air in the tropical lower stratosphere is exchanged with extratropical air on a timescale that is shorter than that of photochemical decomposition of N2O. Previously observed epsilon values, which are invariably smaller than those of photolysis, can be explained qualitatively using a three-dimensional chemical transport model and using a simple model that assumes mixing of "aged" tropical air and extratropical air during residual circulation. Results show that isotopocule ratios are useful to examine the stratospheric transport scheme deduced from tracer-tracer relations. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423232500003 |
WOS关键词 | BREWER-DOBSON CIRCULATION ; NITROUS-OXIDE ; ISOTOPIC FRACTIONATION ; UV PHOTOLYSIS ; AIR ; ISOTOPOMERS ; ENRICHMENT ; TRANSPORT ; N-15 ; (NNO)-N-14-N-14-O-18 |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17272 |
专题 | 地球科学 |
作者单位 | 1.Tokyo Inst Technol, Sch Mat & Chem Technol, Dept Chem Sci & Engn, Yokohama, Kanagawa 2268502, Japan; 2.Tokyo Inst Technol, Earth Life Sci Inst, Tokyo 1528550, Japan; 3.Tohoku Univ, Grad Sch Sci, Ctr Atmospher & Ocean Studies, Sendai, Miyagi 9808578, Japan; 4.Miyagi Univ Educ, Sendai, Miyagi 9800845, Japan; 5.Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058569, Japan; 6.Univ Tokyo, AORI, Kashiwa, Chiba 2778564, Japan; 7.Hokkaido Univ, Fac Environm Earth Sci, Sapporo, Hokkaido 0600810, Japan; 8.Japan Aerosp Explorat Agcy JAXA, ISAS, Sagamihara, Kanagawa 2525210, Japan; 9.Japan Agcy Marine Earth Sci & Technol JAMSTEC, Project Team HPC Adv Predict Using Big Data, Yokohama, Kanagawa 2360001, Japan |
推荐引用方式 GB/T 7714 | Toyoda, Sakae,Yoshida, Naohiro,Morimoto, Shinji,et al. Vertical distributions of N2O isotopocules in the equatorial stratosphere[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(2):833-844. |
APA | Toyoda, Sakae.,Yoshida, Naohiro.,Morimoto, Shinji.,Aoki, Shuji.,Nakazawa, Takakiyo.,...&Ishijima, Kentaro.(2018).Vertical distributions of N2O isotopocules in the equatorial stratosphere.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(2),833-844. |
MLA | Toyoda, Sakae,et al."Vertical distributions of N2O isotopocules in the equatorial stratosphere".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.2(2018):833-844. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论