排序方式： 共有19条查询结果，搜索用时 31 毫秒
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V. P. Shevchenko O. S. Pokrovsky A. S. Filippov A. P. Lisitsyn V. A. Bobrov A. Yu. Bogunov N. N. Zavernina E. O. Zolotykh A. B. Isaeva N. M. Kokryatskaya V. B. Korobov M. D. Kravchishina A. N. Novigatsky N. V. Politova 《Doklady Earth Sciences》2010,430(2):228-234
New data on the elemental composition of the Severnaya Dvina River, the largest one in the White Sea region, are presented. The elemental composition of the river water in May, the period of the snowmelt flood, is similar to the upper layer of the Earth’s continental crust due to the active erosion of the earth material in the catchment area. In August, the period of the summer low water, the impact of biogenic components increases and elevated concentrations of Cd, Sb, Mn, Zn, Pb, and Cu are observed. At other times, no significant pollution by heavy and rare-earth elements is registered. 相似文献
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Doklady Earth Sciences - This work presents data on the study of the sorption of heavy metal cations in sediments of the Central Depression of the Barents Sea. During experiments the naturally... 相似文献
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Nazarova L. B. Razjigaeva N. G. Diekmann B. Grebennikova T. A. Ganzey L. A. Belyanina N. I. Arslanov K. A. Kaistrenko V. M. Gorbunov A. O. Kharlamov A. A. Golovatyuk L. V. Syrykh L. S. Subetto D. A. Lisitsyn A. P. 《Doklady Earth Sciences》2019,486(1):494-497
Doklady Earth Sciences - Results of a paleolimnological investigation of a well-dated lake sediment section from Shikotan Island (Southern Kurils) showed that from ca 8.0 to 5.8 cal ka BP a warm... 相似文献
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M. D. Kravchishina A. A. Klyuvitkin V. N. Lukashin N. V. Politova A. N. Novigatsky A. P. Lisitsyn 《Russian Meteorology and Hydrology》2018,43(10):697-705
The distribution of suspended particulate matter (SPM) and chlorophyll a in the Caspian Sea water column from April to November in 2008–2016 is analyzed. It is shown that the spatiotemporal variability of SPM concentration is defined by its sources, especially by the autochthonous (primary production) and allochthonous (particulate river runoff, aerosols) components. The effect of marginal filters of rivers on the volume of coming allochthonous SPM is considered. It is revealed that chlorophyll a is a reliable marker of the autochthonous component of SPM and biogenic sedimentation conditions. The stable vertical stratification defines the distribution of allochthonous and autochthonous SPM in the water column. Vertical profiles of these SPM components in the active layer (its thickness is usually up to ~60 m, more rarely to ~100 m) of the sea are similar in April and October-November and differ much in May-September. 相似文献
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Doklady Earth Sciences - Data on the assessment of the dynamics of sedimentary waves over the western slope of the Caspian Sea are presented. The process of formation of the wave structure of... 相似文献
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A.P. Lisitsyn 《Russian Geology and Geophysics》2009,50(4):278-298
According to recent data from seas and oceans, marine sediments have extremely uneven thicknesses varying from tens of meters to 15–20 km. Sedimentary material is localized mainly at three global levels: river–sea boundary (zero level, continental base of erosion), continental rise (3–5 km), and trenches (6–11 km). As a result of extremely rapid (“avalanche”) deposition in trenches, large amounts of organic matter accumulate in bottom sediments, thus providing their high petroleum reservoir potential. Sediments in areas of rapid sedimentation have a particular rheology, which causes them to move downslope hundreds of kilometers on the sea floor. Continental rise is a global area where gravitites accelerate, with their potential energy due to a depth difference of 3 to 5 km. Global-scale drift of sedimentary masses driven by eustatic sea level change produces very large deposition zones rich in oil and gas at the continental rise (global piedmont), i.e., at the second level. Predicted oil and gas fields of this kind have been discovered recently at sea depths over 3.5 km, which lie in stock for future development through the 21st century. 相似文献
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AP® GIS&T Study Group 《The Journal of geography》2018,117(4):165-173
This article presents the findings of a study to determine the degree of consistency in what is taught and learned in high school and college-level introductory courses in geographic information science and technology (GIS&T). A content analysis identified sixteen topics that are generally representative of the knowledge, skills, and abilities developed in introductory undergraduate courses. The findings were used to propose a standard college-level survey course in GIS&T that could inform future efforts to introduce more academically rigorous GIS&T coursework in high schools, such as through the Advanced Placement Program. 相似文献