珠江三角洲及珠江口海区的空气微生物含量     

陈皓文 《热带海洋学报》1996,(3)

１９９４年６，７月，调查了广州、深圳、珠海及珠江口海区的空气微生物粒子沉降量状况。发现空气微生物粒子总量、真菌粒子量、真菌粒子数／总菌粒子数百分比在三市中不一致。这三种数据一般是陆上的高于海上。随着距陆的增加，都市影响的减弱和海面的开阔，空气微生物含量呈减少之势，显示出海洋新鲜空气对陆上污染空气的调节、净化作用。文中还分析了空气微生物有关参数与气温、风力或相对湿度间的相关关系。  相似文献   

水面皮层破坏-复原过程的实验室模拟研究     

吴永森  吴隆业 《海洋与湖沼》2001,32(6):605-611

依据水面红外发射和红外遥感测温原理，采用HDG－高灵敏度红外测温仪和常规测量仪器相结合的方法，在实验室空气稳定条件下，模拟测得了水面皮层破坏－复原（重建）的热力过程和气－水温差对水面皮层复原过程的影响，获得了大量的测量数据。数据分析表明，当气－水温差从3．0℃变为11．5℃时，水面皮层破坏可导致皮温增量从气－水温差3．0℃时的0．15℃变到11．5℃时的0．45℃，并发现恢复时间与气－水温差呈负线性关系。  相似文献   

Northward transport of pacific summer water along the Northwind Ridge in the Western Arctic Ocean     

Hiroshi Sumata  Koji Shimada 《Journal of Oceanography》2007,63(3):363-378

The recent sea-ice reduction in the Arctic Ocean is not spatially uniform, but is disproportionally large around the Northwind Ridge and Chukchi Plateau compared to elsewhere in the Canada Basin. In the Northwind Ridge region, Pacific Summer Water (PSW) delivered from the Bering Sea occupies the subsurface layer. The spatial distribution of warm PSW shows a quite similar pattern to the recent ice retreat, suggesting the influence of PSW on the sea-ice reduction. To understand the regionality of the recent ice retreat, we examine the dynamics and timing of the delivery of the PSW into this region. Here, we adopt a two-layer linearized potential vorticity equation to investigate the behavior of Rossby waves in the presence of a topographic discontinuity in the high latitude ocean. The analytical results show a quite different structure from those of mid-latitude basins due to the small value of β. Incident barotropic waves excited by the sea-ice motion with large annual variation can be scattered into both barotropic and baroclinic modes at the discontinuity. Since the scattered baroclinic Rossby wave with annual frequency cannot propagate freely, a strong baroclinic current near the topographic discontinuity is established. The seasonal variation of current near the topographic discontinuity would cause a kind of selective switching system for shelf water transport into the basin. In our simple analytical model, the enhanced northward transport of summer water and reduced northward transport of winter water are well demonstrated. The present study indicates that these basic dynamics imply that a strengthening of the surface forcing during winter in the Canada Basin could cause sea-ice reduction in the Western Arctic through the changes of underlying Pacific Summer Water.  相似文献   

光照强度对海洋微藻脂肪含量及脂肪酸组成影响的研究   总被引：1，自引：0，他引：1  

李荷芳  周汉秋 《海洋科学集刊》2001,(43):178-183

近年来，海洋微藻脂肪酸组成的研究及其应用越来越受到国内外科学家的重视。高度不饱和脂肪酸(PUFA)，特别是长链的n-3 PUFA，如二十碳五烯酸(EPA)和二十二碳六烯酸(DHA)对海洋动物和人类都具有营养学和医学上的价值。在海洋微藻的培养过程中，光照强度是海洋微藻生长的条件之一，光线的明与暗，光度的强与弱，不仅对微藻的生长速率、产量有影响，而且对其脂肪含量和脂肪酸的组成也有影响(Teshima et al.，1983；Thompson et al.，1990； Renaud et al., 1991)。 作者在以往研究的基础上，选择了3种有代表性的海洋微藻：(1)小球藻Chlorella sp-2(李荷芳等，1999)，此藻脂肪酸中EPA含量高、且不含DHA；(2)球等鞭金藻(Isochrysis galbana)，该藻DHA含量较高，但几乎不含EPA；(3)前沟藻(Amphidinium sp.)的EPA、DHA含量均高。将以上3种微藻作为原料，在不同的光照强度下进行培养，测定并分析藻体中的脂肪含量和脂肪酸组成的变化，从而了解光强对海洋微藻脂肪含量及其脂肪酸组成的影响。  相似文献   

Atlas of Japan (East) Sea hydrographic properties in summer, 1999     

Lynne D. Talley  Pavel Tishchenko  Vladimir Luchin  Alexander Nedashkovskiy  Sergey Sagalaev  Dong-Jin Kang  Mark Warner  Dong-Ha Min 《Progress in Oceanography》2004,61(2-4):277

Hydrographic properties from CTD and discrete bottle sample profiles covering the Japan (East) Sea in summer, 1999, are presented in vertical sections, maps at standard depths, maps on isopycnal surfaces, and as property–property distributions. This data set covers most of the Sea with the exception of the western boundary region and northern Tatar Strait, and includes nutrients, pH, alkalinity, and chlorofluorocarbons, as well as the usual temperature, salinity, and oxygen observations.  相似文献   

Preliminary optical classification of lakes and coastal waters in Estonia and south Finland     

Anu Reinart  Antti Herlevi  Helgi Arst  Liis Sipelgas 《Journal of Sea Research》2003,49(4):357

A preliminary optical classification of lakes in Estonia and south Finland which can also be used for small bays of the Baltic Sea is elaborated. The classification is based on the optical properties of water (diffuse attenuation coefficient, diffuse reflectance) and parameters that are routinely monitored in water bodies (Secchi depth, concentration of chlorophyll-a, total suspended matter and yellow substance). The data complex used for our classification covers different types of water ecosystems (ranging from oligotrophic to hypertrophic) and the variability of water constituent concentrations in the ice-free period in Estonia and south Finland. Using cluster analysis, we found 5 optical classes of waters: clear (C), moderate (M), turbid (T), very turbid (V) and brown (B). There is satisfactory correspondence between class of water, shape of diffuse attenuation coefficient and diffuse reflectance spectra and trophic state of the lakes.  相似文献   

Outflow of the Intermediate Oyashio Water from Sagami Bay to the Shikoku Basin     

Yoshihiko Sekine  Keita Uchiyama 《Journal of Oceanography》2002,58(4):531-537

Since the Intermediate Oyashio Water (IOW) gradually accumulates in Sagami Bay, it can reasonably be supposed that the IOW also flows out from Sagami Bay, even though it may be altered by mixing with other waters. We have occasionally observed a water less than 34.2 psu with a potential density of 26.8 at the southeastern area off Izu Peninsula in July 1993 by the training vessel Seisui-maru of Mie University. Observational data supplied by the Japan Meteorological Agency and the Kanagawa Prefectural Fisheries Experimental Station show that the IOW of less than 34.1 psu was observed at northern stations of the line PT (KJ) off the Boso Peninsula and to the east of Oshima in the late spring 1993. Based upon these observations, it is concluded that the IOW flows out from Sagami Bay into the Shikoku Basin along southeastern area off the Izu Peninsula. The less saline water (<34.2 psu) was also observed to the west of Miyake-jima during the same cruise, and the westward intrusion of IOW from south of the Boso Peninsula to the Shikoku Basin through the gate area of the Kuroshio path over the Izu Ridge was detected. This event indicated that the IOW branched south of the Boso Peninsula and flowed into Sagami Bay and/or into the gate area over the Izu Ridge. The southward intrusion of IOW into the south of the Boso Peninsula is discussed in relation to the latitudinal location of the main axes of the Kuroshio and the Oyashio. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

海鳗肌肉及鱼头营养成分的比较研究   总被引：5，自引：0，他引：5  

曾少葵  章超桦  蒋志红 《海洋科学》2002,26(5):13-15

对海鳗肌肉和头的营养成分进行分析研究的结果表明：海鳗肌肉和头的粗蛋白含量分别为19.6%和15.2%，第一限制氨基酸均为色氨酸（Trp）、氨基酸价分别为92和80；必需氨基酸分别各占氨基酸总量的45.5%和36.3%，谷氨酸(Glu)、天门冬氨酸（Asp）、丙氨酸（Ala）和甘氨酸（Gly）等呈味氨基酸在肌肉和头中的含量基本持平，两者均含有丰富的钙、磷等无机元素。从蛋白质和氨基酸的分析结果看，肌肉的营养价值比头高。  相似文献   

加州鲈鱼的繁殖习性,早期胚胎发育以及孵化与水温的关系   总被引：2，自引：0，他引：2  

吴庆龙 《海洋湖沼通报》1993,(1):64-70

作者对加州鲈鱼繁殖习性及早期胚胎发育进行了阐述,对受精卵孵化与水温的关系进行了研究。结果表明:加州鲈鱼2龄即达性成熟,3—6月繁殖产卵,水温20℃—24℃时达产卵盛期;雄鱼具有筑巢护卵及护苗等生殖习性;水温17.4℃—19.5℃,平均18.3℃时,受精卵孵化时数为74小时25分钟;在实验温度范围内,孵化时数与水温负相关,而与有效积温正相关。有效积温与平均水温负相关。  相似文献   

Spatial and temporal variability of heat content above the thermocline in the tropical Pacific Ocean   总被引：1，自引：0，他引：1  

Pu Shuzhen  Yu Fei  Hu Xiaomin  Chen Xingrong 《海洋学报(英文版)》2003,22(2):179-190

Abstract-Heat content of the upper layer above the 20℃ isotherm in the tropical Pacific Ocean isestimated by using the sea temperature data set with a resolution 2°latitude×5°longitude (1980～1993)for the water depths (every 10 m) from 0 m to 400 m, and its temporal and spatial variabilities are an-alyzed. (1) The temporal variability indicates that the total heat in the upper layer of the equatorial Pa-cific Ocean is charcterized by the interannual variability. The time series of the equatorial heat anomaly5 months lead that of the El Nino index at the best positive lag correlation between the two, and theformer 13 months lag behind the latter at their best negative lag correlation. Therefore the equatorialheat content can be used as a better predictor than the El Nino index for a warm or cold event. In addi-tion, it is also found that less heat anomaly in the equator corresponds to the stronger warm events inthe period (1980～1993) and much more heat was accumulated in the 4 years including 1992/1  相似文献