排序方式： 共有12条查询结果，搜索用时 0 毫秒
11.
P. N. Makkaveev P. A. Stunzhas Z. G. Mel’nikova P. V. Khlebopashev Sh. Kh. Yakubov 《Oceanology》2010,50(5):688-697
Hydrochemical studies of the Kara Sea were included into the program of the integrated expedition during cruise 54 of the
R/V Akademik Mstislav Keldysh (September 9–30, 2007). In several sea areas quite different in their weather conditions, a large set of hydrochemical analyses
was carried out, including the determination of the primary nutrients (silicon and different forms of nitrogen and phosphorus),
the dissolved oxygen content, and the total alkalinity and pH values. The report presents the hydrochemical conditions in
the southwestern part of the Kara Sea and the most striking results from the authors’ viewpoint. The data were compared to
those of the integrated oceanographic expedition of cruise 49 of the R/V Dmitry Mendeleev in 1993. 相似文献
12.
Results of plankton biota studies in the southwestern Kara are presented. The spatial distribution of hydrochemical and hydrophysical parameters related to structural and functional characteristics of phytoplankton in the surface water is considered. The chlorophyll a concentration varied in the surface layer of the Kara Sea from 0.08 to 3.22 mg m–3 (mean value 0.62 mg m–3). Primary production varied from 0 to 1.92 mg C m–3 day–1 (the mean value of 0.42 mg C m–3 day–1) in the ice-covered water areas and was greater by a factor of four, ranging from 1.01 to 3.46 mg C m–3 day–1 (the mean value of 1.79 mg C m–3 day–1) in ice-free areas. In this case, the total algal biomass varied from 0.8 to 110.7 mg C m–3 (mean value 10.6 mg C m–3). It is shown that in the study period, waters from the western Kara Sea were more productive than the estuarine water areas of the Ob and Yenisei rivers. The activity of phototrophic phytoplankton in river waters was almost completely absent. It is established that the contents of nutrients and iron were higher than the threshold for limitation of phytoplankton development. The experiments showed that the production activity of phototrophic algae is restrained by light deficit beneath the ice. 相似文献