Controls on deposition of shallow marine carbonates and evaporites – lower Permian Gipshuken Formation,central Spitsbergen,Arctic Norway     

Tone Sorento  Snorre Olaussen  Lars Stemmerik 《Sedimentology》2020,67(1):207-238

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A strict formula for geoid-to-quasigeoid separation   总被引：3，自引：2，他引：1  

Lars E. Sjöberg 《Journal of Geodesy》2010,84(11):699-702

The paper presented by Flury and Rummel (J Geod 83:829–847, 2009) discusses an important topographic correction to the traditional formula for the quasigeoid-to-geoid separation. Nevertheless, as their formula is approximate, the reader may ask for its relation to the strict one (defined as the one consistent with Bruns’s formula and the boundary condition of physical geodesy), which is now derived. Although the result formally differs from that of Flury and Rummel, we show that the two formulas agree to the centimetre level all over the Earth. We also discuss the practical computation of the topographic correction.  相似文献   

The hydrodynamic foundation for salmon lice dispersion modeling along the Norwegian coast     

Asplin  Lars  Albretsen  Jon  Johnsen  Ingrid Askeland  Sandvik  Anne Dagrun 《Ocean Dynamics》2020,70(8):1151-1167

Ocean Dynamics - Norway has complicated dynamics in the coastal ocean and in the fjords. In this area is also the largest salmon aquaculture industry in the world. The salmon industry is valuable...  相似文献   

Temperature assimilation into a coastal ocean-biogeochemical model: assessment of weakly and strongly coupled data assimilation     

Goodliff  Michael  Bruening  Thorger  Schwichtenberg  Fabian  Li  Xin  Lindenthal  Anja  Lorkowski  Ina  Nerger  Lars 《Ocean Dynamics》2019,69(10):1217-1237

Ocean Dynamics - Satellite data of both physical properties as well as ocean colour can be assimilated into coupled ocean-biogeochemical models with the aim to improve the model state. The physical...  相似文献   

3D CFD MODELING OF WATER AND SEDIMENT FLOW IN A HYDROPOWER RESERVOIR     

Nils Reidar B.OLSEN  Oscar F.JIMENEZ  Lars ABRAHAMSEN  and Aslak L*IVOLL 《国际泥沙研究》1999,(1)

１ＩＮＴＲＯＤＵＣＴＩＯＮＲｅｓｅｒｖｏｉｒｓｅｄｉｍｅｎｔａｔｉｏｎｉｓｒｅｃｏｇｎｉｚｅｄａｓｏｎｅｏｆｔｈｅｍａｉｎｐｒｏｂｌｅｍｓａｆｅｃｔｉｎｇｔｈｅｅｃｏｎｏｍｉｃｓｏｆｍａｎｙｗａｔｅｒｒｅｓｏｕｒｃｅｓｐｒｏｊｅｃｔｓ．Ｍａｎｍａｄ...  相似文献   

Depletion and recharge of soil water in two stands of norway spruce (picea abies (l.) karst)     

Lars G. Nordn 《水文研究》1990,4(3):197-213

Depletion and recharge dynamics of soil water were studied at two forest sites in Northern and Southern Sweden during three growing seasons. At each site, having a stand of Norway spruce (Picea abies (L.) Karst), soil water potential was measured with 90 gypsum blocks in 30 profiles at depths of 6, 20, and 50 cm from the soil surface. The size of the rectangular plots was 250 m². The large variation in soil water potential during desiccation periods extended throughout the measuring range of the gypsum blocks. The soil water potentials, at different times and depths, were log-normally distributed during only parts of the desiccation periods. Due to the large variation and skewed distribution of soil water potentials the nonparametric Spearman rank correlation statistics was used to analyse the pattern of desiccation and rewetting of the soil. In the beginning of a dry period the topsoil was more efficiently desiccated than the subsoil at both sites. This difference lasted throughout all droughts at the southern site and was explained by a higher root density in the topsoil. At the northern site, however, there was no difference in the degree of desiccation at different soil depths during an extended desiccation period. While certain microsites tended to be more depleted than others during desiccation periods, this did not prove to be significantly correlated to the rewetting of the soil after the different droughts. There was a vertical relationship in soil water desiccation in which an accentuated water depletion at the 6 cm soil depth was followed by a similar strong depletion 14 cm lower in the same observation profile. Strongly desiccated observation profiles were not necessarily situated close to each other but seemed randomly spread over the site. There was no relationship between extracted water at any of the three soil depths in the different observation profiles and proximity to trees or tree size.  相似文献   

Predicted wavelengths of coronal transitions in the configurations 3s 23p 2, 3s 23p 3 and 3s 23p 4     

Lars Åke Svensson 《Solar physics》1971,18(2):232-243

The level intervals in the ground configurations 3s ²3p ^k(k = 2, 3, 4) have been studied through the isoelectronic sequences up to Ni. Semiempirical expressions for the parameters F ₂(pp) and _p, are derived from observed data and the intervals are recalculated from interpolated or extrapolated values of the parameters. As a result, predicted wavelengths of magnetic-dipole transitions within the configurations are obtained with an estimated uncertainty of one or two Å.  相似文献   

Grazing by a colourless flagellate on a green algal bloom     

Lars Ramberg 《Aquatic Sciences - Research Across Boundaries》1987,49(3):294-302

A dense bloom of a green algae was reduced by 97% within 5 days. This was probably caused by grazing by a colourless flagellate that increased logarithmic to high number under these days and disappeared as quickly. After this the green algae increased rapidly and mucilage lumps excreated by the flagellate was colonized by a specialistChlomydomonas. The flagellate attack was probably enhanced by the high cell density and the physiological weakness of the green algae, due to a very low growth caused by shortage of inorganic carbon. The grazing seems to have caused an increase of inorganic nutrients that promoted the following growth of the green algae.  相似文献   

Models to predict Secchi depth in small glacial lakes     

Lars Håkanson 《Aquatic Sciences - Research Across Boundaries》1995,57(1):31-53

This study quantifies and ranks variables of significance to predict mean values of Secchi depth in small glacial lakes. The work is based on a new, extensive set of data from 88 Swedish lakes and their catchments. Several empirical models based on catchment and lake morphometric parameters are presented. These empirical models can only be used to predict Secchi depth for lakes of the same type, and the models based on geological map parameters can evidently not be used for time-dependent and site typical predictions of Secchi depth. However, many of the principles behind the results ought to be valid for lakes in general. Various hypotheses concerning the factors regulating the variability in mean Secchi depth among lakes are formulated and tested. The most important variables are: Lake colour (expressing allogenic input of different types of humic materials), total-P and lake temperature (measures of production of autogenic materials). The most important map parameters are: The mean depth (linked to resuspension and lake morphometry) and the ratio between the drainage area and lake area (expressing the linkage between catchment and lake). The predictability of some of the models cannot be markedly improved by accounting for the distribution of the characteristics in the drainage area (using the drainage area zonation technique). The variability in mean Secchi depth from other factors, such as precipitation and anthropogenic load, may then be quantitatively differentiated from the impact of these geological factors, which can statistically explain 68% of the variability in Secchi depth among these lakes. The model based on map parameters can also be used to estimate natural, preindustrial reference values of Secchi depth.  相似文献   

Radiation pressure correction to meteor orbits     

Bo ». S. Gustafson  Lars G. Adolfsson 《Earth, Moon, and Planets》1995,71(3):327-332

We present a method to calculate the radiation pressure force to gravity ratio on meteoroids from their atmospheric flight. Radiation pressure corrections to meteor orbits are negligible for fireballs; of the order of or less than the measurement errors ( 1%) for photographic meteors; of the order of and in some cases substantially larger than the measurement errors ( 10%) for radar meteors.  相似文献