著者

Koichi Watanabe Liu Yang Satoru Nakamura Takuya Otani Kenzaburo Mori

出版者

Meteorological Society of Japan

雑誌

SOLA (ISSN:13496476)

巻号頁・発行日

vol.17, pp.109-112, 2021 (Released:2021-05-22)

参考文献数

18

被引用文献数

3

---

Aerosol number concentrations and trace gases (SO2, O3, HCHO, and H2O2) were measured over Imizu City, Toyama Prefecture, Japan on 5 August 2020, from a helicopter. The concentrations of fine particles (0.3-0.5 μm) were high at ground level and at an altitude of approximately 1200 m due to the volcanic plume from Nishinoshima. However, concentrations of aerosol particles were low at an altitude of approximately 2400 m. The volcanic plume did not significantly affect the lower free troposphere. High concentrations of SO2 were also observed. The H2O2 concentrations (0.27-0.56 ppb) were much lower than those during previous observations in the summer (2.0-6.7 ppb) and significantly lower than the SO2 concentrations (1.8-3.3 ppb). The concentrations of HCHO (2.1-2.5 ppb) were higher than those of H2O2. The oxidation of S(IV) to H2SO4 in cloud water might have been suppressed over the studied area.

著者

Koichi Watanabe Liu Yang Satoru Nakamura Takuya Otani Kenzaburo Mori

出版者

Meteorological Society of Japan

雑誌

SOLA (ISSN:13496476)

巻号頁・発行日

pp.2021-017, (Released:2021-04-21)

被引用文献数

3

---

Aerosol number concentrations and trace gases (SO2, O3, HCHO, and H2O2) were measured over Imizu City, Toyama Prefecture, Japan on August 5, 2020, from a helicopter. The concentrations of fine particles (0.3-0.5 μm) were high at ground level and at an altitude of approximately 1200 m due to the volcanic plume from Nishinoshima. However, concentrations of aerosol particles were low at an altitude of approximately 2400 m. The volcanic plume did not significantly affect the lower free troposphere. High concentrations of SO2 were also observed. The H2O2 concentrations (0.27-0.56 ppb) were much lower than those during previous observations in the summer (2.0-6.7 ppb) and significantly lower than the SO2 concentrations (1.8-3.3 ppb). The concentrations of HCHO (2.1-2.5 ppb) were higher than those of H2O2. The oxidation of S(IV) to H2SO4 in cloud water might have been suppressed over the studied area.

著者

Takuya Otani Tohru Takahashi Shuhei Matsuura

出版者

The Japanese Society of Fisheries Science

雑誌

Fisheries science (ISSN:09199268)

巻号頁・発行日

vol.62, no.5, pp.670-674, 1996 (Released:2008-06-30)

参考文献数

20

被引用文献数

6 5

---

Larvae of the swimming pea crab Tritodynamia horvathi hatched in the laboratory were reared to adult, and were bred successfully. Zoeal larvae were obtained from ovigerous females collected at Yatsushiro Sound, and they were reared on rotifers, Artemia nauplii and artificial diet. Zoeae hatched in April passed through five zoeal stages during 15-22 days, and the duration of the megalopal stage was 5-11 days. First stage crabs reached the fifth crab stage within two months. Ovigerous females first appeared from September 14, 6 days after the first copulation was observed. However, the percentage of ovigerous females over this period was less than 7%. Copulation and ovigerous females were not detected during November to January. After February 8, copulation resumed and ovigerous females appeared again. The percentage of ovigerous females in the latter breeding season reached 78%. When the crabs were swimming in the aquarium, they were constantly moving their maxillipeds in a regular pattern, and fed on Artemia nauplii or powder of pellets. This suggests that the swimming behavior of T. horvathi is not apeculiar behavior restricted to mating as the copulatory swimming recorded in some other pinnotherids, but a behavior for feeding.