Inter-annual variability in larval supply to populations of three invertebrate taxa in the northern California Current

We investigated sources of inter-annual variability in larval supply to crab and sea urchin populations at Bodega Head and Point Reyes in northern California. During the spring and summer upwelling seasons of the years 1992 through 1997 we monitored the weekly settlement rates of nine species of crabs and two species of sea urchins. As observed in previous studies, daily values of alongshore windstress, temperature and salinity provided evidence for the poleward flow of relatively warm, low salinity water from south of Point Reyes, an apparent retention zone, during upwelling relaxation events. In years dominated by these events (1992, 1993, 1995 and 1996) we observed that alongshore windstress, temperature and salinity were coherent and temperature was significantly correlated with cancrid crab settlement. During these years the magnitude of cancrid crab settlement and the fraction of cancrid crabs relative to other crab species settling were high. Over four years of concurrent sampling there was consistently greater cancrid crab settlement at the Point Reyes site, within the retention zone, than at Bodega Head. Settlement of non-cancrid crabs (porcellanids, grapsids, pagurids and majids) was not as closely linked to intra-annual patterns of upwelling and relaxation, possibly due to the shorter seasonal availability of larvae allowing for the influence of fewer relaxation events. Settlement of this group among years was positively correlated with environmental indicators of strong seasonal upwelling; high salinity, Bakun upwelling index and low temperature. Sea urchin settlement events were observed in June and July of 1992, 1994 and 1997 during warming periods when salinity and temperature were increasing and alongshore windstress was low. Across the six years of the study, we found that cancrid crab larvae had a more even seasonal availability than larvae of non-cancrid species, which settled in greatest numbers during the early portion of the upwelling season. Sea urchins settled in greatest numbers during the later part of the upwelling season. Together these patterns demonstrate the taxon-specific way that inter-annual variability in larval supply is forced by the coincidence of larval availability with favorable physical transport mechanisms.     

海洋遥感文献库系统设计

以中国国家海洋信息中心出版的《海洋文摘》为主要信息源 ,兼顾其它国内外渠道的相关信息 ,设计了电子版的海洋遥感文献库。该库为适合于海洋遥感的专用文献库 ,在查询内容和种类上多于普通的文献库存。文摘与全文混合编排 ,一般文献只录入摘要 ,重点文章全文录入。文献录入前先经过海洋遥感专家的信息评估和质量控制     

赤潮生物种类特征光谱获取技术

较为系统地研究了赤潮生物水体反射率曲线获取方法。通过对 2类反射率反演方法得出的反射率曲线与实际反射率曲线进行比较 ,得出在不具备大气环境参数的情况下 ,经验线性法的反演结果与实际反射率曲线最接近的结论 ,并进一步对正常海水和赤潮生物水体的光谱特性进行分析 ,提取出赤潮生物水体的特征光谱。这是进行赤潮监测和识别的重要前提     

两种荧光分析法在海洋浮游植物叶绿素测定中的应用

以湛江叉鞭金藻为材料．用普通荧光分析法测定了ｃｈｌａ、ｃｈｉｃ的荧光发射光谱，以四乳突扁藻为材料，用普通荧光分析法和同步荧光分析法测定了ｃｈｌａ、ｃｈｌｂ的荧光发射光谱，结果表明：ｃｈｌａ、ｃｈｌｂ、ｃｈｉｃ的荧光发射峰分别为６７０ｎｍ、６５５ｎｍ、６４０ｎｍ，普通荧光分析法适于进行浮游植物所含的ｃｈｌａ、ｃｈｌｃ的定性、定量测定，而不适于进行ｃｈｌａ、ｃｈｌｂ的同时测定；同步荧光法则适于进行浮游植物中ｃｈｌａ、ｃｈｌｂ的定性、定量的同时测定。     

九龙江河口区水体中的226Ra和228Ra

用ＭｎＯ２－纤维富集大体积水样中的Ｒａ同位素，并用直接射气法测定２２６Ｒａ和２２８Ａｃ的β计数法测定２２８Ｒａ的方法，研究了九龙江河口区２２６Ｒａ，２２８Ｒａ的行为，结果表明：在该河口区２２６Ｒａ，２２８Ｒａ均呈非保守行为，２２６Ｒａ，２２８Ｒａ的最高值分别在盐度为１９和９处测得。２２８Ｒａ／２２６Ｒａ）Ａ．Ｒ．值在盐度小于１９的区域约为３左右。与世界其他河口区相比，九龙江河口区的２２６Ｒａ，２２     

海洋中的烃及其迁移和衰变

对海洋中有关烃类的研究工作进行回顾和总结，分别介绍海洋中烃的来源，迁移和衰变及石油对海洋的污染。     

长江三角洲北翼全新统底界和“硬粘土层”的讨论

本文以钻孔资料为依据,通过岩石地层学、生物地层学和~(14)C测年分析,认为应以第一海相层底板作为Q_4/Q_(1-3)界线,而不能机械地划在“硬粘土层”顶板;上更新统顶部属河漫、湖沼相沉积,后经暴露、脱水局部层段硬化而成为所谓的杂色“硬粘土层”;本区晚更新世末古地形呈由东、东南向西、西北逐渐抬升的掀斜状,并控制着全新世的海侵方向和范围。     

分潮波模型多资料数值计算方法研究 Ⅱ.有限差分最小二乘方法

对含多资料的分潮波模型的超定问题进行探讨，建立一种有限差分—最小二乘方法，该方法使得岸边资料直接进入了计算方程，并保证岸界法向流速为零条件。通过对渤海的四大分潮的试算，证实本方法可行。     

Virgin rock temperatures from well logs — accuracy analysis for some advanced inversion models

Temperature data from 18 measurement series obtained during logging of the Oseberg field in the northern North Sea are presented. Because the measurement series are taken at approximately the same depth, they should give identical temperatures after depth correction, and are suitable for assessing the performance of different models used to determine virgin rock temperatures from well log information.We have used this data set to test the properties of the different models given by Shen and Beck (1986). Although these models were built to simulate closely the thermal recovery of a well and are unbiased, the uncertainties in the temperature estimates when applied to real data are found to be no less than those from simpler (biased) models. This fact confirms the conclusion of Hermanrud (1989a) who showed that physical factors other than those presently accounted for significantly influence the thermal recovery of a borehole.