Occurrence of the toxic dinoflagellate Ostreopsis cf. ovata in relation with environmental factors in Monaco (NW Mediterranean)

To study environment characteristics favoring the toxic benthic dinoflagellate Ostreopsis cf. ovata, a survey was conducted in Monaco (NW Mediterranean Sea), in summers 2007 and 2008. Epiphytic and planktonic blooms occurred almost simultaneously and a high variation of abundances at low spatial scales was observed. An early and very marked bloom occurred in 2007, compared to a later and less abundant development in 2008. These distinct patterns in bloom timing corresponded with very different hydroclimatic scenarios in 2007 (hot spring and relatively cold summer) and 2008 (standard year compared to the median year profile estimated with data from 1995 to 2008). No clear impacts of summer seawater temperature, rainfall or nutrient concentrations were evident. Strong wind may favor the dispersal of benthic and planktonic cells. Our study suggests that further investigations are needed to examine the potential role of Ostreopsis nutritional mode (i.e. autotrophy vs. mixotrophy).     

板块构造与地幔流的动力学：从局部尺度到全球尺度

板块构造受控于集中在板块边界的推动力和阻力,然而由观测资料所约束的高精度全球地幔流模型仍面临着计算上的挑战。我们利用最新的自适应网格细化算法,将板块边界的分辨尺度下降到1km,通过分析相接板块的运动,在并行计算机上模拟全球地幔流。在上地幔中,当消减板块向下俯冲时,往往会产生弧后扩张和板片回退现象。下地幔中冷的热异常通过狭窄的高粘性的板块与洋壳相耦合,导致洋壳运动速度的下降。在海沟区域,弯曲岩石层内的粘性耗散占整个岩石层和地幔总耗散的5％至20％。     

All Season Observations of Meromictic Regime at Lake Doroninskoye

正1 Introduction Soda Lake Doroninskoye(Uleoti District of Transbaikalian Region,Russia)belongs to a rare type of meromictic basins.For meromictic basins,the vertical stratification in the form of sufficiently thin water layers with significantly differing physical and chemical properties is typical,as well as peculiar biota.The main characteristics of the lake Doroninskoye are:     

余震空间分布的构造约束

对由大地震引起的静应力变化的计算结果说明,余震的空间分布是能够在一级精度上做出预测的,因为余震首先发生在正的应力变化地区。这些地区的划分需要将应力扰动分解到已知取向的平面上;通常的做法是用了解不多的区域应力信息来计算最佳取向的破裂面,并假设这些面无处不在。本文我们说明这种假设未得到观测的支持,而是余震破裂面受地质构造的控制。我们坚持认为,用构造取向的统计量度代替区域应力信息做出的余震危险性评估更有价值。     

Distribution and Sources of Polycyclic Aromatic Hydrocarbon （PAH） in Marine Environment of China

1INTRODUCTIONPolycyclicaromatichydrocarbons (PAHs)depo sit edinmarineenvironmentsfromavarietyofsourcessuchaswastewater,industrialanddomesticdischarges,andoilspills.Themajorityofthesesourcesfrompetrogenicoriginischaracterizedbyadominanceoflowmolecularweightaromaticcompounds,especiallynaphthaleneandalkylatedPAHs(Sportoletal.,1 983 ) .Crudeoilanditsrefinedproductssuchasgasoline,keroseneandotherfu eloilshaveahighcontentofalkylatedPAHsduetotheirslowformationattemperatureslowerthanthatofcomb…     

Ophiolitic Chromitites Originated from Ancient SCLM

<正>Ophiolitic chromitites are traditionally considered as the products of melt-mantle interaction in the supra-subduction zone after partial melting of mantle peridotites during upwelling of asthenosphere at oceanic spreading centers.The occurrence of natural diamonds in situ in chromitites and peridotites in southern Tibet(Yang et al.,2013;Griffin     

Metal contamination in southern Brazil vineyard soils

The viticulture is a rapidly developing agricultural branch in the Rio Grande do Sul State (southern Brazil). Situated in a region with a humid temperate climate, Brazilian vine-growing areas are dampest in the world (annual precipitation close to 2000 mm…     

Optical Photometric Observations of 7-Ray Loud Blazars

We report results of our optical photometric observations of ten gamma-ray loud blazers, namely: 0219+428 (3C66A), PKS 0420-014 (OA 129), S5 0716+714, 0754+100 (OI 090.4), 0827+243 (OJ248), 1652+398 (Mrk 501), 2200+420 (BL Lacertae), 2230+114 (CTA 102), 2251+158 (3C 454.3) and 2344+514. The observations were carried out in September-October, 2000 using the 70 cm optical telescope at Abstumani Observatory, Georgia. We found intra-day variations in 0420-014, S5 0716+714, BL Lacertae and CTA 102. A variation of 0.3 magnitude over a time scale of about 3 hours was observed in the R passband in BL Lacertae on JD 2451827. We did not detect any variation in 3C 66A, Mrk 501, or 3C 454.3 during our observations. Nor did we detect any clear evidence of variation in 1ES 2344+514 during our two weeks' observing run of the TeV gamma-ray source.