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1.
1 IntroductionNervous necrosis virus( NNV) is one of theworldwide pathogens in cultured species and breed-ing from the late 1980s (Bovo et al.,1999; Tan etal., 2001; Breuil et al., 2001; Munday et al.,2002; Lin et al., 2001). The virus is isometric andnon…  相似文献   

2.
1 IntroductionThe carbon cycle in the ocean, related to theglobal warming and human food, is of great scientificsignificance. Studies for the carbon transfer and trans-formation in the ocean, including the assimilative andmetabolic capacity, have become one of key researchfoci in global biogeochemical studies (Tsunogai et al.,1997; Hu and Yang, 2001; Hansell et al., 2003; Wei etal., 2003; Yang et al., 2004; Yuan et al., 2004).As is known, POC is composed of living fractionsand organic debr…  相似文献   

3.
1 IntroductionIt is well known that varying dietary fatty acidprofile affects the tissue fatty acid composition and e-ven the growth performance in fish ( Bell et al.,2002; Figueiredo -Silva et al., 2005; Harel andPlace, 2003; Schulz et al., 2005; Tocher et al.,2003). Docosahexaenoic acid (DHA), an importantessential fatty acid for marine species, has the effectnot only on the fatty acid profile of fish body tissue,but also on biological and physiological conditions(Ishizaki et al., 2000; …  相似文献   

4.
1IntroductionTunicates(Chordata:Thaliacea)are large pe-lagic gelatinous zooplankton.They can be used as in-dicator species for ocean currents and water bodies(Chen et al.,1980;Chen et al.,1988;Lin,1988,1990;Lin and Zhang,1993;Thompson,1948).They also play…  相似文献   

5.
I~IOXWith regard tO the 5,tudy on the planktonic copeal distributions in the Kuroshio waters ofthe East China Sea and its adjacent areas, a great ~nt of reSearch work has been made by somescholars at home (He and Yang, 1990; Meng et al., 1990; He, 1990; Liu et al., 1991; He etal., 1992; He et al., 1994). HOwever, the most of them were made in a single season, and it isabet about in the research of the various aspects of species comPOSition, abundance distributionand ecological characte…  相似文献   

6.
1 Introduction Indonesian Throughflow (ITF) connects the Indian and Pacific Oceans at low latitudes. There is the well- known interannual variability, El Ni%o, over the tropical Pacific. The recent finding of Indian Ocean Dipole (IOD) (Saji et al., 1999; …  相似文献   

7.
1 IntroductionThe empirical and simple model studies suggestthe existence of a SST dipole mode in the tropical At-lantic which is antisymmetric about the annual-meanthe intertropical convergence zone (ITCZ) and in-volves air- sea interaction through the wind- SST-evaporation (WES) feedback (Carton, 1996; Chang etal., 1997; Zhao et al., 2003). Chang et al. (2000)found that the dominant near-surface atmospheric re-sponse in the tropical Atlantic sector primarily comesfrom the local SST f…  相似文献   

8.
1 IntroductionKnowledge of suspended particle size and distri-bution is the key elements for better understandingthe sediment transport processes ( Wang et al.,2004), primary production (Ning et al., 2004),water quality controlling and pollution predictio…  相似文献   

9.
正The South China Sea (SCS), in particular the northern SCS, is one of ocean areas where energetic internal solitary waves (ISWs)occur most frequently (Cai et al., 2012; Zheng, 2017). Based on the re-appearance period (RP) at an observation station, Ramp et al.(2004) divided the ISWs into two types:Type-a and Type-b. Type-a ISWs arrive regularly at the same time every day, i.e., the RP is about 24 h, and Type-b ISWs arrive about one hour late every day, i.e., the RP is about 25 h. The discovery of the Types-a and b ISWs  相似文献   

10.
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11.
1 IntroductionFor several reasons, the Arctic Ocean and itsmarginal seas are key areas for understanding ocean-ic circulation and global climate system ( Clark,1982; Hansen et al., 1983; Walsh et al., 1996;Overpeck et al., 1997). First, the Arctic Ocean i…  相似文献   

12.
IrocrIowThere is a linkage in shallow marine systerns between sea-noor biOgaxhemical pmeessesand water column pnductivity (Bereson et al., l998). Benthic fluxes provide a significantsource of nutrients to the overlying water tO supPOrt primary pnduction and play a role in de-.creasing oxygen concentrations (van et al., l999; Cowan and Boynton, l996; Berelson etal., 1998; Friedl et al., l998; Zabel et al., l998). TherefOre, it is imPOrtant to define theediment di8genetic pathways for the …  相似文献   

13.
<正>The typhoon,as a mature tropical cyclone that develops in the western part of the North Pacific Ocean with high wind speed and heavy rainfall,is one of the most lethal and costly of natural disasters for the densely populated countries of East Asia.It can be easily detected by space-borne sensors operated at microwave,visible or infrared bands(Liu et al.,2014).Synthetic Aperture Radar(SAR)is  相似文献   

14.
Experimental Investigation of the Decay from A Ship’s Propeller   总被引：1，自引：0，他引：1  
In the present study,an experimental investigation of the decay of the maximum velocity and its turbulent characteristics behind a ship propeller,in "bollard pull" condition(zero speed of advance),is reported.Velocity measurements were performed in laboratory by use of a Laser Doppler Anemometry(LDA) measurement system.Earlier researchers described that the maximum axial velocity is constant at the initial stage of a ship’s propeller jet(Fuehrer and Rmisch,1977;Blaauw and van de Kaa,1978;Berger et al.,1981;Verhey,1983) as reported in a pure water jet(Albertson et al.,1950;Lee et al.,2002;Dai,2005),but a number of researchers disagreed with the constant velocity assumption.The present study found that the maximum axial velocity decays in the zone of flow establishment and the zone of established flow with different rates.The investigation provides an insight into the decays of both the maximum velocity and the maximum turbulent fluctuation in axial,tangential and radial components and the decay of the maximum turbulent kinetic energy.Empirical equations are proposed to allow coastal engineers to estimate the jet characteristics from a ship’s propeller.  相似文献   

15.
1 Introduction Meiofauna is an important group in benthic small food web energetically due to their small size, high abundance and fast turnover rates. The production of meiofauna is equal to or higher than that of macrofau- na in estuaries, shallow waters and deep sea (Gerlach, 1971; Platt and Warwick, 1980; Heip et al., 1985; Zhang et al., 2004). A role of meiofauna may be the recycling of nutrients. Marine nematodes may keep the bacterial colonies on sand grains in active phase of growth …  相似文献   

16.
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17.
1 IntroductionThe study of SAR remote sensing of surface wake of a semi-elliptical submerged body is of great importance actually in the ocean. The dynamics and the SAR remote sensing mechanism of this wake are very complicated. Numerous researches (Bergmann et al., 1958; Miles, 1968a,b; Huppert and Miles, 1969; Bon-neton et al., 1993) indicate that in the ocean the imagery and dynamics of this wake are quite different when a semi-elliptical submerged body moves horizontally at high speed …  相似文献   

18.
I~crIOWIn the coastal area, especially at the sandy seashore, wave and nearshore current are the major factors which affect sediment transPOrt and the motyhChdynamics.The numerical models of predicting the beach evolution can be classified intO the medi~term and long-term models according to their space and time scales (De Briend et al., 1993;Watanabe, 1990; Watanabe et al., 1986; Tao, 1996). In the medium-term model the effects ofwave, nearshore current and sediment transport are conside…  相似文献   

19.
The understanding of the distribution of trace heavy metals in the world ocean has greatlyimProved in the past decades. But most of the data are of vertical profiles of certain stations(Bruland, l980; Paul et al., l992; RObert et al., l990) and large--scale study of temporaland spatial variability of trace heaVy metals in the ocean is rather few. In fact, affected by ver-tical mixing by upwelling or convection, biogenic removal, atmospheric fallout and continentalinput frorn rivers, the dist…  相似文献   

20.
1 .IntroductionWhile surface solitary waves arefoundin many physical phenomena (Chouand Shih,1996 ;Chouand Quyang,1999 ;Chouet al .,2003 ; Chenet al .,2004 ; Wang,2004 ;Tsenget al .,2005) ,internal solitary waves (ISWs) have been observed since the beginning of the 20th century.In fact ,some internal waves have alarge enoughamplitudeto cause consequence onthe surface .Hence obser-vation of the oceansurface may helpto detect the activities of internal waves . We require observationsthrough…  相似文献   

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