福建省前汛期旱涝年前冬季500hPa高度场特征及其与东亚冬季风的关系

通过对1961～2001年福建前汛期降水与东亚前冬季冬季风强弱与副高强度间的相关性等统计分析表明：前冬季冬季风强（弱）年，前汛期西太平洋副高偏弱（强），福建降水偏多（少），此外，本文利用ECMWF再分析资料，对比分析了旱涝年份前冬季500hPa环流形势差异．其结果显示：旱（涝）年前冬季，东亚大槽偏弱（强），冬季风减弱（增强），副热带高压偏强（弱）。     

Intersexuality incidence, sex ratio fluctuations and intersex reproductive output as factors affecting the temporal variation of intersexed populations of the marine amphipod Echinogammarus marinus

The occurrence of intersexuality in populations of the marine amphipod Echinogammarus marinus has been related to several causes, including anthropogenic contamination, microsporidian parasites and environmental sex determination (ESD). At the individual-level, the costs of intersexuality in E. marinus are reflected in reduced reproductive output of intersexes compared to normal specimens. The impacts of intersexuality and other reproductive disorders in nature will only be fully understood when individual-level effects are upscale to the population-level, which can be achieved through ecological models. The aim of the present work is to simulate the density variation of real populations of E. marinus with different intersexuality incidence, proportions of phenotypes and intersex female reproductive rates. To achieve that, we have incorporated empirical data obtained at the individual-level from three intersexed populations of E. marinus into a population dynamic model. The original model was calibrated and validated for a long-term stable population without intersexuality and sex ratio 1. In the present version, the model includes an extra population group, intersex females, but the total sum of flow rates from juveniles to adults was kept the same as in the original model to respect the previous validation. In these circumstances, results indicate that the male-biased population is very sensitive to intersexuality, even at low incidence levels, and exhibits significant density decrease if conditions do not change. On the contrary, the two populations with a preponderance of female-biased sex ratios, low or moderate intersexuality incidence (up to an average value of 9% of the population) and with intersex reproductive rates corresponding to 80% the value of normal specimens, exhibit long-term persistence.The model is highly sensitive to adult female parameters (e.g. mortality), indicating that small variations on its values can significantly change population responses.Overall the present results suggest that, in spite the costs of intersexuality in E. marinus, the temporal variation of intersexed populations depend on intersex incidence level, sex ratio fluctuations and reproductive output of intersexes. Simulations also suggest that other processes (e.g. mortality rates of normal females) may play important roles in the maintenance of populations with intersexuality. In the future, it will be crucial to improve and validate this type of models with long-term observations and monitoring of intersexed populations.     

Effect of low salinity on the survival of recently hatched veliger of Nassarius reticulatus (L.) in estuarine habitats: A case study of Ria de Aveiro

The effect of low salinity on the survival of recently hatched veliger of the gastropod Nassarius reticulatus (L.) was studied under laboratory conditions at 17 °C ± 1 °C. Significant mortality occurred for salinities ≤ 17 psu and the LS₅₀ (salinity that causes 50% mortality) varied from 14.5 psu to 17.2 psu for exposures between 1 h and 48 h, respectively. The results were included in a mathematical model in order to estimate the mortality of N. reticulatus veliger in Ria de Aveiro under different salinity scenarios determined by numerical simulation. The model predicts a massive mortality of veliger immediately after their eclosion (1 h) in Ria de Aveiro during spring tide when the river input reaches its expected maximum — a situation that has been observed occasionally and may overlap a massive eclosion of veliger in the water. Except in this extreme situation, the mortality in Ria de Aveiro is generally restricted to the upstream limits of the channels. The results indicate that N. reticulatus recruitment in estuaries may strongly depend on the prevailing salinity regime.     

An excess of very bright stars in the inner bulge

From an analysis of the stars remaining in central regions of the Galaxy after subtracting those belonging to the disc and the bulge, we deduce that the inner bulge must have an extra young population with respect to the rest of the bulge. It is shown that there is a higher ratio of very bright stars in the central bulge than there is in the outer bulge. This is interpreted as being an additional young component due to the presence of star formation regions near the Galactic Centre which is absent in the outer bulge.     

On coherent ice drift features in the southern Beaufort sea

Previous studies have highlighted reversals in the Beaufort Gyre on regional scales during summer months, and more recently, throughout the annual cycle. In this study we investigate coherent ice drift features associated with individual ice beacons during winter 2008 that may be a signature of ice–coast interactions, atmospheric and/or oceanic forcing. Examined in particular are three case studies associated with reversals in ice beacon trajectories in January and April of 2008; case I corresponds to a meander reversal event in January, case II to a loop reversal event in April, and case III to a meander reversal event located to the northeast of the Mackenzie Canyon in April. An assessment of atmospheric and oceanic conditions during these reversal events shows enhanced ocean–sea-ice–atmosphere dynamical coupling during the Case I meander reversal event in January and comparatively weak coupling during the Case II loop and Case III meander reversal event in April. Absolute (single-particle/beacon) and relative (two-particle/beacon) dispersion results demonstrate dominant meridional ice drift displacement and inter-beacon separation for Case I relative to Cases II and III indicative of ice–ice and ice–coast interactions in January. The results from this investigation provide an ice drift case study analysis relevant to, and template for, high-resolution sea ice dynamic modeling studies essential for safety and hazard assessments of transportation routes and shipping lanes, ice forecasting, and nutrient and contaminant transport by sea ice in the Arctic.     

国土资源科技管理统计指标体系的设计

科技统计指标体系是对科技活动进行统计的重要工具。本文从国土资源科技管理的角度对科技统计指标体系进行分析和补充,细化了科技投入与研发、科技人才培养、科技产出、国际科技合作的量化值,进一步丰富和完善了科技统计的指标体系。