Aerial observation of nitrogen compounds over the East China Sea in 2009 and 2010

Fujiwara, Hiroshi; Sadanaga, Yasuhiro; Urata, Junki; Masui, Yoshihiko; Bandow, Hiroshi; Ikeda, Keisuke; Hanaoka, Sayuri; Watanabe, Izumi; Arakaki, Takemitsu; Kato, S.; Kajii, Yoshizumi; Zhang, Daizhou; Hara, Kazutaka; Fujimoto, Toshiyuki; Seto, Takafumi; Okuyama, Kikuo; Ogi, Takashi; Takami, Akinori; Shimizu, Atsushi; Hatakeyama, Shiro

doi:10.1016/j.atmosenv.2014.01.064

Cited by 10 publications

(6 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A short transport time results in a short reaction time for NO x oxidation to occur during transport from the Asian continent to the Fukue site, allowing NO x emitted from the Asian continent to arrive at the Fukue site before being oxidized. Previous research (Takashima et al, 2011;Fujiwara et al, 2014) also suggests the long-range transport of unoxidized NO x from the Asian continent, and transboundary pollutions of nitrogen compounds from the Asian continent, including various oxidation states of NO y , are important contributions to nitrogen pollution in East Asia. …”

Section: Discussionmentioning

confidence: 99%

“…In this case, NO x oxidation and T.NO 3 formation occur mainly via photochemical reaction in the presence of solar radiation during long-range transport. In fact, the aerial observations over the East China Sea showed that T.NO 3 /NO y ratios in autumn were higher than in winter (Fujiwara et al, 2014). This reflects the fact that solar radiation in winter is weaker, yielding lower photochemical activity, than in autumn.…”

Section: Introductionmentioning

confidence: 93%

“…Low photochemical activity results in slower oxidation reaction rates of NO x . The aerial observations over the East China Sea suggested that NO x originating from the Asian continent remained unoxidized over the East China Sea in winter (Fujiwara et al, 2014). Continuous measurements of NO 2 at altitudes of 0-1 km using Multi-Axis Differential Optical Absorption Spectroscopy at Cape Hedo showed that NO 2 concentrations increased, when air masses were transported from China, within a period of about 24 h (Takashima et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneous observations of NO y and T.NO 3 at Cape Hedo and Fukue Island, Nagasaki, Japan, indicated that the ratio of T.NO 3 to NO y increased during transport from Fukue Island to Cape Hedo, especially in fresh air masses (i.e., initially low T.NO 3 /NO y ratios) (Yuba et al, 2014). Fujiwara et al (2014) performed aerial observations of NO y , HNO 3 , and NO 3 -(p) over the East China Sea in autumn and winter. They showed that NO 3 -(p)/T.NO 3 ratios were less than 0.5 in most cases, suggesting that the main formation process of NO 3 -(p) was through heterogeneous reaction of HNO 3 on sea salt surfaces, except during Asian dust events.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Transboundary Transport of Nitrogen Oxides from the Asian Continent to Fukue Island, Japan: Analyses of Long-Range Transport of Nitrogen Compounds

Sadanaga

Takaji

Takami

et al. 2017

Aerosol Air Qual. Res.

Self Cite

View full text Add to dashboard Cite

To investigate long-range transport and oxidation states of nitrogen compounds from the Asian continent, especially of total odd nitrogen species (NO y ), we carried out continuous observations of NO y , total nitrate (T.NO 3 ; the sum of gaseous nitric acid and particulate nitrate) and NO x (= NO + NO 2 ) at Fukue Island, located in westernmost Japan. NO y and T.NO 3 exhibited similar seasonal cycles, with maximum concentrations observed during winter-spring seasons, and minimum concentrations during summer. NO x had a seasonal cycle, with maximum and minimum concentrations in winter and summer, respectively; NO x concentrations also decreased markedly from winter to spring. High-concentration event analyses to assess transboundary pollution of NO y were performed. Transboundary pollution events for NO y were extracted, and classified as either "Case 1" or "Case 2". Case 1 involved transport of NO y , T.NO 3 , and NO x from the Asian continent to Fukue Island, while Case 2 involved transport of NO y and T.NO 3 , but not NO x . Case 1 and Case 2 occurred predominantly in winter and spring, respectively. Air mass trajectories indicated that in Case 1, 52% of air masses passed through Korea, while only 5% passed through Korea in Case 2. These results indicate that some NO x emitted from the Asian continent is transported to Fukue Island as NO x , without it undergoing oxidation, reflecting low photochemical activity and/or short transport times.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transboundary Transport of Nitrogen Oxides from the Asian Continent to Fukue Island, Japan: Analyses of Long-Range Transport of Nitrogen Compounds

Sadanaga

Takaji

Takami

et al. 2017

Aerosol Air Qual. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ambient temperature and other flight observation data (e.g., atmospheric pressure and flight speed) were monitored onboard the aircraft. The flight system is also described in other works (Hatakeyama et al, 2011;Fujiwara et al, 2014;Hatakeyama et al, 2014).…”

Section: Airborne Observation and Sample Collectionmentioning

confidence: 99%

UV-Tolerant Culturable Bacteria in an Asian Dust Plume Transported over the East China Sea

Hara

Zhang

Matsusaki

et al. 2015

Aerosol Air Qual. Res.

Self Cite

View full text Add to dashboard Cite

Airborne bacteria are dispersed along with Asian dust and have various influences on atmospheric characteristics, downwind ecosystems, and public health. In this study, aircraft observations were conducted during Asian dust passage and non-dust conditions over the East China Sea in December 2010, and the composition of culturable bacteria within the dust was investigated using culture-based gene analysis. The 16S rRNA gene analysis revealed that the 34 cultured strains isolated from the transported dust could be grouped into Bacillales and Actinomycetales. Highly tolerant endospore-forming bacteria (25 isolates) were predominant in the composition. On the other hand, all non-endospore-forming bacteria (9 isolates) were gram-positive bacteria with high guanine and cytosine contents, which have substantial ultraviolet (UV) resistance. Thus, the isolated culturable bacteria were strains having some tolerance for exposure to UV radiation. Although the atmosphere is an extreme environment for bacterial survival, Asian dust can facilitate atmospheric dispersion of culturable bacteria that are resistant to the harsh ambient air environment.

show abstract

Significant parameter for controlling the partition of ambient nitrate species between HNO3(g) and NH4NO3(p)

Oniwa,

Abe,

Aikawa

2023

Environ Monit Assess

View full text Add to dashboard Cite

Aerial observation of nitrogen compounds over the East China Sea in 2009 and 2010

Cited by 10 publications

References 41 publications

Transboundary Transport of Nitrogen Oxides from the Asian Continent to Fukue Island, Japan: Analyses of Long-Range Transport of Nitrogen Compounds

Transboundary Transport of Nitrogen Oxides from the Asian Continent to Fukue Island, Japan: Analyses of Long-Range Transport of Nitrogen Compounds

UV-Tolerant Culturable Bacteria in an Asian Dust Plume Transported over the East China Sea

Significant parameter for controlling the partition of ambient nitrate species between HNO3(g) and NH4NO3(p)

Contact Info

Product

Resources

About