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排序方式: 共有85条查询结果,搜索用时 31 毫秒
51.
A regional atmosphere-ocean coupled model,RegCM3-POM,was developed by coupling the regional climate model(RegCM3) with the Princeton Ocean Model(POM).The performance of RegCM3-POM in simulating a persistent snow storm over southern China and the impact of the Madden-Julian oscillation(MJO) on this persistent snow storm were investigated.Compared with the stand-alone RegCM3,the coupled model performed better at reproducing the spatial-temporal evolution and intensity of the precipitation episodes.The power spectral analysis indicated that the coupled model successfully captured the dominant period between 30 and 60 days in the precipitation field,leading to a notable improvement in simulating the magnitude of intraseasonal precipitation variation,and further in enhancing the intensity of the simulated precipitation.These improvements were mainly due to the well-simulated low-frequency oscillation center and its eastward propagation characteristics in each MJO phase by RegCM3-POM,which improved the simulations of MJO-related low-frequency vertical motions,water vapor transport,and the deep inversion layer that can directly influence the precipitation event and that further improved the simulated MJOprecipitation relationship.Analysis of the phase relationship between convection and SST indicated that RegCM3-POM exhibits a near-quadrature relation between the simulated convection and SST anomalies,which was consistent with the observations.However,such a near-quadrature relation was not as significant when the stand-alone RegCM3 was used.This difference indicated that the inherent coupled feedback process between the ocean and atmosphere in RegCM3-POM played an important part in reproducing the features of the MJO that accompanied the snow storm. 相似文献
52.
利用1/30°分辨率三维POM(Princeton Ocean Model)模式,以M2、S2、K1、O14大分潮作为潮汐边界条件,模拟南海西北部(105.5-115°E,16-23°N)海域正压潮,分析琼州海峡及其附近区域正压潮能通量分布特征。结果表明,研究海域内M2分潮和全日潮都是顺时针传入北部湾,然后自西向东通过琼州海峡,直至琼州海峡东口;计算所得穿过琼州海峡中部(110°E断面)能通量为M2,0.2GW或m1,0.47GW;穿过北部湾湾口(18.5°N断面)能通量为M2,1.0GW或m1,2.5GW;海南岛西部和琼州海峡处潮能耗散最强。 相似文献
53.
Anukul Buranapratheprat Tetsuo Yanagi K. Olaf Niemann Satsuki Matsumura Pramot Sojisuporn 《Journal of Oceanography》2008,64(5):639-656
Although plankton bloom incidents in the upper Gulf of Thailand (UGoT) have been reported, no dynamic investigation of the
phenomenon has been conducted. To address this need, a simple pelagic ecosystem model coupled with the Princeton Ocean Model
(POM) was employed to investigate seasonal variations in surface chlorophyll-a (chl-a) distributions to clarify phytoplankton
dynamics in this area. The results revealed patterns of seasonal chl-a distribution that correspond to local wind, water movement
and river discharge. High chl-a patchiness was found to be concentrated near the western coast following westward circulation
near the northern coast developed during the northeast monsoon. During the southwest monsoon high concentrations were observed
around the northeastern coast due to eastward flow. The simulated results could explain the seasonal shifting of phytoplankton
blooms, which typically arise along the western and eastern coasts during the northeast and the southwest monsoons, respectively.
Sensitivity analyses of simulated chl-a distributions demonstrate that water stability, including wind-induced vertical currents
and mixing, plays significant roles in controlling phytoplankton growth. Nutrients in the water column will not stimulate
strong plankton blooms unless upwelling develops or vertical diffusivity is low. This finding suggests an alternative aspect
of the mechanism of phytoplankton bloom in this region. 相似文献
54.
To assess settling particulate organic matter (POM) seasonality and its availability to the benthic community, settling particulate matter was studied in terms of mass fluxes and main biogeochemical characteristics (including organic carbon (OC), nitrogen, and stable carbon and nitrogen isotopic values) at two Lake Superior offshore sites over the course of a year. Fourier transform infrared spectroscopy (FTIR) and hydrolysis, extraction, and derivatization were used to provide further compositional information. Carbon and nitrogen content, isotopic and wet chemical data, and FTIR spectra show that summer particulate material is mainly autochthonous, with higher proportions of amide and carbohydrate. FTIR shows that spring particulate material contains relatively high proportions of clay minerals, indicating major sources from sediment resuspension and/or spring runoff. Distinct amino acid distributions at the two sites, revealed by principal component analysis (PCA) based on amino acid mol% composition, possibly result from differences in OM sources and the degree of degradation occurring at the two sites. Carbohydrate (PCHO), total hydrolyzable amino acid (THAA) and FTIR data suggest that the nutritional value of bulk POM to benthic heterotrophs should be lower in spring than summer-fall, although both periods exhibited high sinking fluxes of total mass and OC. Due to sediment resuspension events and an oxic water column, organic matter eventually buried in Lake Superior’s sediments has probably experienced extensive alteration due to several cycles through the water column and the bacterially-active sediment-water interface. 相似文献
55.
Abstract. In order to evaluate the effect of epibenthic suspension-feeding organisms on nepheloid-layer processes, a novel flow-through 'Benthic Ecosystem Tunnel' was used on sublittoral marine sediment substrate. Our test organism was the ascidian Microcosmus sulcatus . Particle and chlorophyll a reduction were recorded. The correlation of seasonal fluctuations of chlorophyll a concentrations with chlorophyll a reduction by M. sulcatus indicates the potential for Microcosmus to control local phytoplankton input to the subtidal nepheloid layer. However, the relatively low density of Microcosmus at the study site, the nature of the sediment surface and the susceptibility of ascidians to high turbidity ( i.e. , high sedimentation rates of total particular matter (TPM) causing frequent periods of siphon closure and inactivity) makes it unlikely that M. sulcatus is an important element controlling the composition of the nepheloid layer on a large scale. 相似文献
56.
基于POM模式的"blending"同化法,构建了天津港及附近海域分辨率为1'×1'、13个主分潮的精密潮汐模型。构建过程中重点关注水深数据格网化与潮汐模型的精度评估。水深数据格网化过程基于尽量扩大覆盖范围、分辨率与水深数据相匹配以及保持岸线形状基本不变等原则。潮汐数值模拟过程采用分批同化T/P点与验潮站,实现对潮汐模型精度的可靠评估。经估计,在天津港附近的9个主分潮RSS在10cm内。 相似文献
57.
A coupled ice-ocean model for the Bohai Sea Ⅱ. Case study 总被引:2,自引:0,他引:2
1 Introduction As mentioned in the previous paper (Su et al., 2004), investigation and application of the coupled ice- ocean model play an important role in the polar and climate research. In recent years, great attention is paid to the research on coupled models of ice margin zone and regional seas and its application in marine engineering and forecasting. For example, simulation study on seasonal evolution rule of sea ice and upper layer ocean during a winter in the Labrador Sea was conduct… 相似文献
58.
59.
60.
Stable Carbon and Nitrogen Isotopic Characterization of Organic Matter in a Mangrove Ecosystem on the Southwestern Coast of Thailand 总被引:1,自引:0,他引:1
Organic matter in a tropical mangrove ecosystem was characterized by stable carbon and nitrogen isotopic analyze, conducted
on various organic samples, including land and mangrove plants, soils, particulate organic matter (POM), and sea and river
sediments along the southwestern coast of Thailand. The δ13C values of land plants and POM in river water can be explained in terms of a greater influence of C3 plants than C4 plants in this area. The POM and sediments from the Trang River and Ko Talibong area showed systematically higher δ15N values than those from Ko Muk and other coastal areas. Organic matter in the Trang River might be influenced by nitrogen
released from agricultural or human waste, which could affect the isotopic composition of POM and sediments in the Trang River
estuary and along the coast near the river mouth. We used a stochastic method to estimate the contributions of four organic
end-members, identifiable by their δ13C and δ15N values. The results implied that seagrasses were a major source of sedimentary organic matter, contributing 42 ± 5% in the
Ko Muk area and 36 ± 5% in the Ko Talibong area. The contribution of coastal POM to sediments was estimated to be only 13%
in Ko Muk and 19% in Ko Talibong. Mangrove plants contributed approximately 23% in both areas. It was concluded that seagrasses
are an important source of sedimentary organic matter in this coastal region of southwestern Thailand.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献