scholarly journals Temporal increases of phosphate and apparent oxygen utilization in the subsurface waters of western subarctic Pacific from 1968 to 1998

2001 ◽  
Vol 28 (17) ◽  
pp. 3285-3288 ◽  
Author(s):  
T. Ono ◽  
T. Midorikawa ◽  
Y. W. Watanabe ◽  
K. Tadokoro ◽  
T. Saino
Keyword(s):  
Oxygen Utilization ◽  
Subarctic Pacific ◽  
Western Subarctic Pacific ◽  
Subsurface Waters ◽  
Apparent Oxygen Utilization

Mesozooplankton responses to iron-fertilization in the western subarctic Pacific (SEEDS2001)

2005 ◽  
Vol 64 (2-4) ◽  
pp. 237-251 ◽  
Author(s):  
Atsushi Tsuda ◽  
Hiroaki Saito ◽  
Jun Nishioka ◽  
Tsuneo Ono
Keyword(s):  
Subarctic Pacific ◽  
Western Subarctic Pacific ◽  
Iron Fertilization

Laboratory observations on early development of the oncaeid copepod Triconia canadensis from the mesopelagic zone of the western subarctic Pacific

2007 ◽  
Vol 87 (2) ◽  
pp. 479-482 ◽  
Author(s):  
Yuichiro Nishibe ◽  
Tsutomu Ikeda
Keyword(s):  
Lipid Droplets ◽  
Development Time ◽  
Hatching Success ◽  
Egg Development ◽  
Egg Hatching ◽  
Subarctic Pacific ◽  
Western Subarctic Pacific ◽  
Mesopelagic Zone ◽  
Life Cycle Strategy

Egg development time and hatching success were determined for the oncaeid copepod, Triconia canadensis, from the mesopelagic zone of the western subarctic Pacific. The egg development time was estimated to be 74.7–84.5 days at in situ temperature (3°C), which is much longer than those reported previously on the other oncaeid copepods even if the differences in experimental temperatures are taken into account. The egg hatching success varied between 50 and 100%, with a grand mean of 88%. The newly hatched nauplii of T. canadensis were elongate ellipsoid in shape, and had many large-sized lipid droplets in their body. Possible adaptive significance of apparent longer egg developmment time of T. canadensis is discussed in the light of their life cycle strategy.

scholarly journals OKSIGEN TERLARUT DAN APPARENT OXYGEN UTILIZATION DI PERAIRAN WAIGEO BARAT, RAJA AMPAT

2019 ◽  
Vol 7 (2) ◽  
pp. 52-57
Author(s):  
Simon I Patty ◽  
Putri Sapira Ibrahim ◽  
Fione Yukita Yalindua
Keyword(s):  
Oxygen Utilization ◽  
Papua Barat ◽  
Apparent Oxygen Utilization

Pengamatan kadar oksigen terlarut telah dilaksanakan di perairan Waigeo Barat, Raja Ampat, Papua Barat. Penelitian ini bertujuan untuk mengetahui kondisi oksigen terlarut dan Apparent Oxygen Utilization (AOU).  Hasil analisa menunjukkan bahwa kadar oksigen terlarut di lapisan permukaan, 5 meter dan dekat dasar masing-masing berkisar antara 5.90-8.48 mg/l; 6.06-8.04 mg/l dan 6.12-7.98 mg/l. Berdasarkan nilai suhu dan salinitas yang diperoleh dari penelitian ini telah dihitung daya larut, derajat kejenuhan oksigen dan nilai AOU. Di lapisan permukaan nilai AOU berkisar antara (-0.01)-2.77 mg/l, di kedalaman 5 meter dan dekat dasar nilai AOU positif masing-masing berkisar antara 0.10-2.06 mg/l dan (0.16)-1.99 mg/l. Konsentrasi oksigen terlarut di perairan Waigeo Barat, Raja Ampat, belum menunjukkan dampak negatif terhadap lingkungan perairan dan masih sesuai dengan baku mutu air laut untuk biota laut. Kata kunci: Oksigen terlarut, AOU, Salinitas, Waigeo Barat, Raja Ampat

scholarly journals Seasonal variation of CaCO<sub>3</sub> saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean

2016 ◽  
Vol 13 (22) ◽  
pp. 6155-6169 ◽  
Author(s):  
Michiyo Yamamoto-Kawai ◽  
Takahisa Mifune ◽  
Takashi Kikuchi ◽  
Shigeto Nishino
Keyword(s):  
Seasonal Variation ◽  
Bottom Water ◽  
Chukchi Sea ◽  
Early Summer ◽  
Biological Processes ◽  
Oxygen Utilization ◽  
Saturation State ◽  
High Productivity ◽  
Major Factors ◽  
Apparent Oxygen Utilization

Abstract. Distribution of calcium carbonate saturation state (Ω) was observed in the Chukchi Sea in autumn 2012 and early summer 2013. Ω in bottom water ranged from 0.3 to 2.0 for aragonite and from 0.5 to 3.2 for calcite in 2012. In 2013, Ω in bottom water was 1.1–2.8 for aragonite and 1.7–4.4 for calcite. Aragonite and calcite undersaturation was found in high productivity regions in autumn 2012 but not in early summer 2013. Comparison with other parameters has indicated that biological processes – respiration and photosynthesis – are major factors controlling the regional and temporal variability of Ω. From these ship-based observations, we have obtained empirical equations to reconstruct Ω from temperature, salinity and apparent oxygen utilization. Using 2-year-round mooring data and these equations, we have reconstructed seasonal variation of Ω in bottom water in Hope Valley, a biological hotspot in the southern Chukchi Sea. Estimated Ω was high in spring and early summer, decreased in later summer, and remained relatively low in winter. Calculations indicated a possibility that bottom water could have been undersaturated for aragonite on an intermittent basis even in the pre-industrial period, and that anthropogenic CO2 has extended the period of aragonite undersaturation to more than 2-fold longer by now.

Functional roles of interzonal migrating mesozooplankton in the western subarctic Pacific

2003 ◽  
Vol 57 (3-4) ◽  
pp. 279-298 ◽  
Author(s):  
Toru Kobari ◽  
Akiyoshi Shinada ◽  
Atsushi Tsuda
Keyword(s):  
Subarctic Pacific ◽  
Functional Roles ◽  
Western Subarctic Pacific
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