搜索结果: 76-90 共查到“知识库 物理海洋学”相关记录186条 . 查询时间(4.691 秒)
Unprecedented slow growth and mortality of the rare colonial cyanobacterium, Nostoc zetterstedtii, in oligotrophic lakes
Unprecedented slow growth rare colonial cyanobacterium
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2014/4/4
Centimeter-large colonies of Nostoc zetterstedtii from a Swedish oligotrophic lake had the lowest growth and
mortality rates of any studied temperate macrophyte. Annual growth rates at two shallow si...
Phosphatases relieve carbon limitation of microbial activity in Baltic Sea sediments along a redox-gradient
carbon limitation Baltic Sea sediments
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2014/4/4
The relationship between phosphatase activity and the element limiting microbial activity (carbon [C], nitrogen
[N], or phosphorus [P]) was studied experimentally in sediment from four stations in th...
Comparative effects of urea, ammonium, and nitrate on phytoplankton abundance, community composition, and toxicity in hypereutrophic freshwaters
Comparative effects of urea ammonium nitrate
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2014/4/4
Dissolved nitrogen (N) as urea ([NH2
]2CO), nitrate (NO{
3
), and ammonium (NHz
4
) was added to naturally
phosphorus (P)-rich lake water (up to 175 mg P L21
) to test the hypotheses that pollu...
Crenarchaeol tracks winter blooms of ammonia-oxidizing Thaumarchaeota in the coastal North Sea
ammonia-oxidizing Crenarchaeol tracks winter
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2014/4/4
We followed the abundance and distribution of ammonia-oxidizing Archaea (AOA) in the North Sea from
April 2003 to February 2005 and from October 2007 to March 2008 by quantification of archaeal genes...
利用FVCOM海洋数值模式,在球坐标系统下考虑非线性效应和天体引潮力的影响,基于非结构的三角形网格建立了包括中国近海、日本海、鄂霍次科海和部分西北太平洋海域的高分辨率海洋潮汐数值模型,并采用趋近法同化84个沿岸验潮站的观测资料。模拟结果与175个验潮站的实测结果拟合良好,M2,S2,K1,O1四个主要分潮振幅和迟角的绝对平均误差分别为4.0 cm和5.6°,2.4 cm和7.5°,2.6 cm和6...
Influence of Forward Speed on the Lateral Vibration of a Slender Structure in Water
forward speed vibration in water slender structure fluid-structure interaction
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2011/9/9
In this paper, the effects of forward speed on the lateral vibration of a slender structure in an infinite fluid are considered. By equating the bending stress of the structure with the hydrodynamic f...
Analysis of Properties of Thrust Bearing in Ship Propulsion System
thrust bearing thrust pad lubrication properties ship propulsion shaft geometrical factors
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2011/9/9
Thrust bearing is a key component of the propulsion system of a ship. It transfers the propulsive forces from the propeller to the ship’s hull, allowing the propeller to push the ship ahead. The perfo...
Optical characterization of chromophoric dissolved organic matter using wavelength distribution of absorption spectral slopes
Optical characterization chromophoric dissolved organic matter wavelength distribution absorption spectral
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2014/4/17
We use a new approach to characterize the absorption characteristics of chromophoric dissolved organic matter (CDOM) in standard solutions and in several tropical lake ecosystems (Lake Victoria, Lake ...
Physical and biogeochemical limits to internal nutrient loading of meromictic Lake Kivu
Physical biogeochemical internal nutrient loading meromictic Lake Kivu
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2014/4/17
Lake Kivu is one of the large African Rift lakes situated between the Democratic Republic of the Congo and Rwanda. In its permanently stratified hypolimnion, unusually high methane concentrations have...
Abundance and single-cell activity of bacterial groups in Antarctic coastal waters
Abundance single-cell activity
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2014/4/17
We estimated the abundance and single-cell activity of bacterial groups in waters off the West Antarctic
Peninsula (WAP) using a combination of microautoradiography and fluorescent in situ hybridizat...
The influence of river plume dynamics on trace metal accumulation in calanoid copepods
iver plume dynamics calanoid copepods
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2014/4/17
The concentrations of Ag, Cd, Cu, Hg(II), monomethylmercury (MeHg), Pb, and Zn were measured and
modeled in calanoid copepods collected from the Hudson River plume in April 2005 and May 2006. Copepod...
Contribution of picophytoplankton to carbon export in the equatorial Pacific: A reassessment of food web flux inferences from inverse models
Contribution of picophytoplankton equatorial Pacific
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2014/4/17
The paradigm that carbon export is derived almost exclusively from the primary production of large
phytoplankton has been challenged by inverse ecosystem modeling studies that suggest that most carbo...
Killer storms: North Atlantic hurricanes and disease outbreaks in sea urchins
disease outbreaks sea urchins North Atlantic hurricanes
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2014/4/17
An increase in the incidence of disease in various marine organisms over the past few decades has been linked
to ocean climate change. In Nova Scotia, Canada, mass mortalities of sea urchins, due to ...
Carbonate mineral saturation states along the U.S. East Coast
Carbonate mineral saturation states the U.S. East Coast
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2014/4/17
To assess the impact of ocean acidification on the carbonate chemistry of the shelf waters off the southeastern
United States (South Atlantic Bight [SAB]), we measured carbonate mineral saturation st...
Decomposition of plankton-derived dissolved organic matter in permeable coastal sediments
plankton-derived dissolved organic matter coastal sediments
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2014/4/16
We tested the hypothesis that dissolved organic carbon (DOC) is degraded when filtered through permeable
shelf sediments. In a laboratory flume experiment the concave shape of DOC profiles observed i...