把海洋经济作为“1号工程”全力抓好

荣成市确立了把海洋经济作为“1号工程”全力抓好的经济发展思路,决心继续保持全国第一渔业大县的位次。为此,提出了三条措施：①对海洋经济的地位和作用还要再认识;②要有建设国内外一流大企业的雄心壮志;③要找准今后海洋经济大发展的“起重杠杆”。     

Eustatic and hydrodynamic controls on the architecture of a deep shelf sand bank (Celtic Sea)

The architecture of a tidal sand bank in the south-eastern Celtic Sea was examined using very high-resolution seismic surveys. The bank comprises four depositional units. The lowest unit 1 is characterized by gently dipping (1–8°) strata that strike parallel to the length of the bank. Unit 1 is erosionally overlain by unit 2, which forms the bulk of the bank. This unit consists of stacked sets of downcurrent-dipping (7–12°) master bedding formed by climbing, sinuous-crested tidal dunes that are up to 20 m high. These deposits are locally incised by an anastomosed channel network (unit 3) that may represent a buried swatchway system. The upper part of the bank comprises wave-related deposits that are mainly preserved on the bank flanks (unit 4). The outer bank surface is erosional. The bank is believed to have formed during the last post-glacial sea-level rise. The facies evolution from unit 1 to unit 3 indicates an upward increase in tidal energy, mainly characterized by the thickening of dune cross-bed sets in unit 2. The majority of bank growth is inferred to have occurred in water depths of the order of 60 m. This evolution was controlled by relative sea-level rise, which is likely to have caused an episode of tidal resonance with associated strong tidal currents that were responsible for the incision of the deep, cross-cutting channels of unit 3. The transition to wave-dominated sedimentation in unit 4 is related to the decay of resonance with continued sea-level rise.     

Fractal analysis of bathymetry and gravity profiles across the Chagos-Laccadive Ridge and the Carlsberg Ridge in the Indian Ocean

Gravity and bathymetry data have been extensively used to infer the thermo-mechanical evolution of different segments of the oceanic lithosphere. It is now understood that magmatic fluid processes involved in the accretion of oceanic crust are spatially complex and episodic. The nature of these processes which are in general nonlinear, can be described using fractal analysis of marine geophysical data. Fractal analysis has been carried out for gravity and bathymetry profiles over the aseismic Chagos-Laccadive Ridge and the spreading Carlsberg Ridge. The Iterated Function Systems (IFS) have been used to generate synthetic profiles of known dimension (D) and these are compared with the observed profiles. The D for the data sets are in the range of 1–1.5. The D for gravity profiles is less than those of bathymetry and the D for gravity and bathymetry over spreading ridge is higher than the aseismic ridge. The low fractal dimension indicates that the processes generating them are of low dimensional dynamical systems.     

深海橄榄岩研究进展

很久以来,深海橄榄岩一直被认为是洋中脊下地幔熔融残留体,但最近深海橄榄岩实际矿物组分研究和全岩化学成分重建的结果表明,深海橄榄岩是洋脊下地幔熔融残留体和过量橄榄石的混合物。深海橄榄岩的成因是洋脊下上隆地幔降压熔融作用和熔体上升通过地幔最上部的热边界层时发生冷却、结晶出橄榄石的联合作用的结果。地幔熔融程度越高,深海橄榄岩越亏损,则含有越多的过量橄榄石。为此,只要把深海橄榄岩中过量的橄榄石剔除后,其实际矿物组分就能有效地反映洋脊下地幔熔融作用和熔融萃取过程。     

一种模拟三维海流运动的差分方法

提出了一种模拟三维海流运动的隐式差分方法,井给出其计算步骤。通过对该差分方法的稳定性分析可以发现,它的时间步长取值有较大的灵活性。该方法被用于崖门海域的海流模拟。实例计算表明,该差分方法计算过程稳定,计算结果合理,能较好地反映出三维海流运动的特征。     

Model calculation of air-sea heat fluxes over ocean area near Chinawith GEOS DAS system

INTRODUCTIONThebulktransfermethodanddirectmeasurementorgradientmeasurementmethodareusuallyusedforthefluxobservationandcalculation.ThesemethodsprovidethefluxvaluesonlyinthelOCationwherethemeasurementsarecarriedout.Inrecentyearsscientistsbegantousemodelcombinedwithremotesensingdataforcalculationofflux.Itsmainpropertyistoobtainthefluxdistributionoverawideareasimultaneouslyandunderstandthegeographicaldistributioncharacterisiticsoffluxconvenientlyanddirectly.Inthispaper,wewillcalculatethegeog…     

联合国“海洋十年”规划实施之初动态与展望

近几十年来,全球的海洋健康状况明显下降。为了防止、减缓和扭转未来海洋健康和功能的恶化趋势,联合国启动了海洋科学促进可持续发展十年(2021—2030年)(简称“海洋十年”)规划,以整合全球海洋相关领域的资源与力量,科学地保护海洋并实现海洋资源的可持续开发和利用。联合国“海洋十年”规划为海洋领域的科学家、政策制定者、私营部门、非政府组织和地方群体更加高效、合理地共同保护和开发海洋资源提供了一个广阔平台,也为中国实现海洋强国战略、发展海洋科技带来了机遇与挑战。本研究通过梳理联合国“海洋十年”规划的发展过程和已批准的行动与活动,结合文献信息分析,深度解析了“海洋十年”规划的发展和实施动态,探讨了“海洋十年”规划的热点研究主题。自2020年9月,联合国正式发布“海洋十年”规划以来,共有来自60个国家的409项行动获得“海洋十年”的批准,其中包括47项计划、277个项目和85项捐助,研究热点主要是海洋政策制定与海洋管理、海洋生态系统健康和海洋生物多样性等。在此基础上,本文从“海洋十年”活动的实施与协调、能力建设、资金支持、人才培养和宣传推广的角度,进一步提出了促进我国全面参与“海洋十年”规划实施...     

洞体应变对高频气压波响应的传递函数——以陕西宁强台为例

自2011年观测以来,陕西宁强台洞体应变的高频气压效应甚为显著,但其频率依存性至今尚不明晰。为此,本文尝试采用相干函数和传递函数等方法,对该台2019年1月1日—4月2日的洞体应变和气压数据进行了系统诊断。结果表明,在8～40cpd频段内,洞体应变对气压具有较强的频率依赖性,即气压系数和相移均会随频率的变化而呈现非线性变化,其中,最大气压系数为7.80×10^-9/hPa,相位超前可达108.27°,且NS和EW分量的气压响应有所差异。上述结果将有助于该台高频噪声的物理溯源,同时还能为高频气压效应的分频段改正等提供量化依据。