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Doklady Earth Sciences - The 147Sm–143Nd systematics of 14 samples of basalts, tuffs, silicites, and dolerites from the interval 6925.2–8250 m of the SG-7 superdeep borehole (En-Yakha),... 相似文献
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Oceanology - The characteristics of the abiotic environmental parameters obtained during in situ observations and significant for the survival of cod eggs and larvae (water salinity, water... 相似文献
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Validation of high-resolution TRMM-3B43 precipitation product using rain gauge measurements over Kyrgyzstan 总被引：3，自引：2，他引：1
Marina O. Karaseva Satya Prakash R. M. Gairola 《Theoretical and Applied Climatology》2012,108(1-2):147-157
This paper presents the validation of monthly precipitation using Tropical Rainfall Measuring Mission Multisatellite Precipitation Analysis (TMPA)—3B43 product with conventional rain gauge observations for the period 1998–2007 over Kyrgyzstan. This study is carried out to quantify the accuracy of TMPA-3B43 product over the high latitude and complex orographic region. The present work is quite important because it is highly desirable to compare the TMPA precipitation product with the ground truth data at a regional scale, so that the satellite product can be fine-tuned at that scale. For the validation, four different types of spatial collocation have been used: station wise, climatic zone wise, topographically and seasonal. The analysis has been done at the same spatial and temporal scales in order to eliminate the sampling biases in the comparisons. The results show that TMPA-3B43 product has statistically significant correlation (r?=?0.36–0.88) with rain gauge data over the most parts of the country. The minimum linear correlation is observed around the large continental water bodies (e.g., Issyk-Kul lake; r?=?0.17–0.19). The overall result suggests that the precipitation estimated using TMPA-3B43 product performs reasonably well over the plain regions and even over the orographic regions except near the big lake regions. Also, the negative bias suggests the systematic underestimation of high precipitation by TMPA-3B43 product. The analyses suggest the need of a better algorithm for precipitation estimation over this region separately to capture the different types of rain events more reliably. 相似文献
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The impact of the Major Baltic Inflows (MBIs) of 1976, 1993, and 2003 on cod reproduction in the Gotland Basin of the Baltic Sea is considered based on calculations of the eastern Baltic cod egg abundance and offspring survival indices. The reproductive success (1976–1977) was defined by the elevation of the 11 psu isohaline and deepening of the 2 mL/L isooxygene surface, which provided the formation of a water layer suitable for cod spawning at a depth of 90–130 m. Prerequisites of the appearance of the reproductive layer in 1976–1977 were a previously high salinity level and penetrating two successive MBIs in one year. The cause of the weak MBI impact in 1993 was the previous salinity minimum; in 2003 it was rapid oxygen depletion due to an increase in temperature. As a result of their weaker influence, small and fragmented cod spawning biotopes appeared in the Gotland Basin. 相似文献
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Correlations have been revealed between the distribution of the different ichthyoplankton species and the fluctuations of the environmental factors along transects in the Baltic Sea during the autumn of 2005 and spring and autumn of 2006. The early ontogenetic stages of the cod and other bottom fish species were confined to the Bornholm Basin located in the southwestern part of the sea with near-bottom salinity of more than 16?? and the absence of an oxygen deficiency in the isohaline zone of 11?C14??. Eggs and larvae of the Baltic sprat were distributed in June throughout all the deep-sea regions with near-bottom water salinity of no less than 8%., up to the western Gulf of Finland. In the spring of 2006, the abundance of sprat eggs was found to drop significantly compared with the average long-term data for the recent period; this was due to the cold winter of 2006. 相似文献
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M.?G.?Frick D.?I.?Vasyanina T.?V.?Karaseva O.?V.?Kuznetsova V.?I.?Gorbachev 《Geochemistry International》2010,48(3):226-237
The distribution of stable carbon isotopes was investigated in the organic matter, bitumoids, and bitumoid fractions from
the rocks of the section of the En-Yakhinskaya superdeep parametric well (8250 m) drilled in northern West Siberia, within
the world’s largest gas region. The formation of the isotopic composition of organic matter and bitumoids under the conditions
of advanced catagenetic stages (up to AC3) was evaluated. A tendency was established of a decrease in the δ13C value of bitumoids and fractions of various polarity with increasing depth. A relation was reliably detected between the
isotopic compositions of carbon from organic matter, bitumoids, and particular bitumoid fractions. The main factors affecting
the distribution of carbon isotopes in the organic matter of deep-seated sequences were distinguished. The genesis of bitumoids
below the oil window is related to the destruction of organic matter under the conditions of advanced catagenesis resulting
in anomalous features in the distribution of carbon isotopes in bitumoids. 相似文献
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