排序方式： 共有7条查询结果，搜索用时 15 毫秒
1
1.
Abstract The potential of stable isotope ratios (2H/1H and 18O/160) of water as a modern tool for palaeoclimatic reconstructions on continents is reviewed. Examples of stable isotope records of palaeo-precipitation preserved in various continental archives (polar ice sheets, mid- and low latitude glaciers, lacustrine deposits, groundwater) are presented, and the methodology of their interpretation in terms of climatic changes is briefly discussed. To interpret quantitatively the isotope records preserved in continental archives, the response of the isotopic composition of precipitation to long-term fluctuations of key climatic parameters (temperature, precipitation amount, relative humidity) over the given area should be known. Further, the transfer functions relating the climate-induced changes of the isotopic composition of precipitation to the isotope record preserved in the given archive should be established. Since the isotopic composition of precipitation has been monitored only for the past three decades, alternatives ways of assessing the long-term climatic sensitivity of the isotopic signature of precipitation are being investigated. The isotope composition of precipitation should be viewed not only as a powerful proxy climatic indicator but also as an additional hydrometeorological parameter which should be explored as a diagnostic tool for the modelling of climate-induced changes in the water cycle, both on a regional and a global scale. 相似文献
2.
LESZEK LINDNER LESZEK MARKS KAZIMIERZ PEKALA 《Boreas: An International Journal of Quaternary Research》1984,13(1):35-47
On the basis of field and laboratory studies supported by thermoluminescence dates, an occurrence of marine and glacial sediments is described from South Spitsbergen. These deposits are thought to date from the Holsteinian interglacial and the Saalian glacial stages respectively. In addition, the evidence and extent of Vistulian and Holoccne glacial advances in South Spitsbergen are presented. These advances occurred at 50,000–43,000, 30,000–10,000, 3,000–2,500 and 600–100 years B.P. The latter have been tentatively correlated with those recorded in other parts of Svalbard, as well as in East Greenland, the Barents Sea, Scandinavia, the Baltic Sea, North Poland and the Russian Plain. 相似文献
3.
Sources of precipitation over South-Eastern Spain and groundwater recharge. An isotopic study 总被引：2，自引：0，他引：2
4.
5.
KAZIMIERZ WIIKOWSKI 《Boreas: An International Journal of Quaternary Research》1989,18(4):357-358
A new simple method of using a stretching device to stabilize coring rods in deep water is described. The method can be used for sediment coring with rod-operated samplers in lakes of a water depth down to 30–40 m. 相似文献
6.
Six-year record of atmospheric carbon dioxide and methane at a high-altitude mountain site in Poland 总被引：2，自引：0，他引：2
7.
Abstract The natural variability of precipitation in agricultural regions both in time and space is modelled using extensions of Box & Jenkins (1976) methodology based on the ARMA procedure. This broad class of aggregate regional models belongs to the general family of Space-Time Autoregressive Moving Average (STARMA) processes. The paper develops a three-stage iterative procedure for building a ST ARMA model of multiple precipitation series. The identified model is STMA (13). The emphasis is placed on the three stages of the model building procedure, namely identification, parameter estimation and diagnostic checking. In the parameter estimation stage the polytope (or simplex) method and three further classical nonlinear optimization algorithms are used, namely two conjugate gradient methods and a quasi-Newton method. The polytope method has been adopted and the developed model performed well in describing the spatio-temporal characteristics of the multiple precipitation series. Application has been attempted in a rural watershed in southern Canada. 相似文献
1