一种新型人工“流体包裹体”：融合二氧化硅毛细管技术          下载免费PDF全文

倪培  丁俊英  I-Ming Chou  Jean Dubessy 《地学前缘》2011,18(5):132-139

利用融合二氧化硅毛细管技术制作了纯H2O体系、纯CO2体系、H2O-NaCl体系和H2O-CO2体系的人工包裹体样品,并对样品进行了显微测温和激光拉曼光谱测试工作。实验结果显示毛细管样品中的流体成分具有代表性,而且常规的流体包裹体显微测温和显微激光拉曼光谱分析技术完全适于毛细管样品的测试。对样品的显微测温和拉曼光谱研究...  相似文献   

²²²Rn flux and soil air concentration profiles in West-Germany. Soil ²²²Rn as tracer for gas transport in the unsaturated soil zone     

HELMUT DÖRR  KARL OTTO MÜNNICH 《Tellus. Series B, Chemical and physical meteorology》1990,42(1):9-19

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Climate changes during the last c. 7500 years as recorded by the degree of peat humification in the Lofoten region,Norway     

KARL‐DAG VORREN  CHRISTIN ELDEGARD JENSEN  EILIF NILSSEN 《Boreas: An International Journal of Quaternary Research》2012,41(1):13-30

Vorren, K.‐D., Jensen, C. E. & Nilssen, E. 2012 (January): Climate changes during the last c. 7500 years as recorded by the degree of peat humification in the Lofoten region, Norway. Boreas, Vol. 41, pp. 13–30. 10.1111/j.1502‐3885.2011.00220.x. ISSN 0300‐9483. Two peat cores from two neighbouring bogs in Lofoten, northern Norway were densely AMS dated and analysed for humification. The two cores have been influenced by human agricultural impact, especially c. 1600 cal. a BP, which may have affected the local hydrology of the bogs. From 7400 cal. a BP onwards, 19 distinct wet‐shifts are recorded in the two cores. Eight or nine of these correspond chronologically to periods of low solar activity. This correlation is most convincing during the last 2000 years. Some wet‐shifts are connected with a solar low‐activity period during the Subboreal/Subatlantic transition, which in central Europe is dated at 2750–2565 cal. a BP. For Lofoten, the corresponding Subboreal/Subatlantic transition – or the wet‐shift marking this transition – is dated at c. 2600 cal. a BP. Some wet‐shifts occur just before or just after solar low‐activity periods, but only four of the nineteen wet‐shifts are clearly not temporally connected with periods of low solar activity. Compared with the wet‐shifts in NW European (mainly British Isles) bogs, there are more frequent wet‐shifts in northern Norway. Compared with other peat cores in northern Norway, especially for the interval 6500–5000 cal. a BP, Lofoten deviates by its lack of wet‐shifts. As in England, Scotland and Ireland, there is regional variability in the temporal formation of wet‐shifts in northern Norway.  相似文献   

THE RESPONSE OF PARTIALLY DEBRIS‐COVERED VALLEY GLACIERS TO CLIMATE CHANGE: THE EXAMPLE OF THE PASTERZE GLACIER (AUSTRIA) IN THE PERIOD 1964 TO 2006     

ANDREAS KELLERER‐PIRKLBAUER  GERHARD KARL LIEB  MICHAEL AVIAN  JOSEF GSPURNING 《Geografiska Annaler: Series A, Physical Geography》2008,90(4):269-285

Long‐term observations of partly debris‐covered glaciers have allowed us to assess the impact of supra‐glacial debris on volumetric changes. In this paper, the behaviour of the partially debris‐covered, 3.6 km² tongue of Pasterze Glacier (47°05′N, 12°44′E) was studied in the context of ongoing climate changes. The right part of the glacier tongue is covered by a continuous supra‐glacial debris mantle with variable thicknesses (a few centimetres to about 1 m). For the period 1964–2000 three digital elevation models (1964, 1981, 2000) and related debris‐cover distributions were analysed. These datasets were compared with long‐term series of glaciological field data (displacement, elevation change, glacier terminus behaviour) from the 1960s to 2006. Differences between the debriscovered and the clean ice parts were emphasised. Results show that volumetric losses increased by 2.3 times between the periods 1964–1981 and 1981–2000 with significant regional variations at the glacier tongue. Such variations are controlled by the glacier emergence velocity pattern, existence and thickness of supra‐glacial debris, direct solar radiation, counter‐radiation from the valley sides and their changes over time. The downward‐increasing debris thickness is counteracting to a compensational stage against the common decrease of ablation with elevation. A continuous debris cover not less than 15 cm in thickness reduces ablation rates by 30–35%. No relationship exists between glacier retreat rates and summer air temperatures. Substantial and varying differences of the two different terminus parts occurred. Our findings clearly underline the importance of supra‐glacial debris on mass balance and glacier tongue morphology.  相似文献   

Marine transgression in Younger Dryas in Norway   总被引：1，自引：0，他引：1  

KARL ANUNDSEN 《Boreas: An International Journal of Quaternary Research》1978,7(1):49-60

BOREAS Anundsen, K. 1978 03 01: Marine transgression in Younger Dryas in Norway. Boreas, Vol. 7, pp. 49–60. Oslo. ISSN 0300–9483.
The lithostratigraphy and biostratigraphy of sediment cores from two basins in southwestern Norway have been studied and radiocarbon dated. The diatom and the Hystrix content indicates a marine Younger Dryas transgression that reached its maximum level at the transition Younger Dryas/Preboreal Chronozone. No Allerød transgression to the same altitude can be demonstrated, and the suggested Allerød transgression at Bømlo (Faegri 1944) is most likely of Younger Dryas age, too.  相似文献   

PETROGENESIS AND PALAEOENVIRONMENT OF DEVONIAN ALGAL LIMESTONES OF NEW SOUTH WALES   总被引：1，自引：0，他引：1  

KARL H. WOLF 《Sedimentology》1965,4(1-2):113-178

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THE KNUD RASMUSSEN MEMORIAL EXPEDITION Introduction     

dr. phil. N. KINGO JACOBSEN  CHR. BAY  B. FREDSKILD  B. GRøNNOW  B. HOLM JAKOBSEN  M. MELDGAARD 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2013,113(1):29-44

Jacobsen, N. Kingo, et.al. Report of activities at Tugtuligssuaq, Melville Bugt, 1978–79. Geografisk Tidsskrift 80: 29–44. Copenhagen, June 1980.

A joint cooperative Greenland/Danish expedition to the Melville Bugt area, Tugtuligssuaq/Kap Seddon to throw light on the Eskimos' immigration routes to Greenland seen in relation to climatic fluctuations. Studies of geography, botany, zoology, archaeology, and ethnohistory have been carried out.  相似文献   

Rapid flooding of the southern Vietnam shelf during the early to mid‐Holocene          下载免费PDF全文

RIK TJALLINGII  KARL STATTEGGER  PAOLO STOCCHI  YOSHIKI SAITO  ANDREAS WETZEL 《第四纪科学杂志》2014,29(6):581-588

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Chronology and paleoenvironments during the late Weichselian deglaciation of the southwest Iceland shelf     

ANNE JENNINGS  JAMES SYVITSKI  LINDA GERSON  KARL GRÖNVOLD  ÁSLAUG GEIRSDÓTTIR  JÓRUNN HARDARDÓTTIR  JOHN ANDREWS  SVEINUNG HAGEN 《Boreas: An International Journal of Quaternary Research》2000,29(3):163-183

Foraminifera, sedimentology, and tephra geochemistry in core 93030-006 LCF from the southwestern Iceland shelf were used to reconstruct paleoenvironments between 12.7 and 9.4 ¹⁴C ka BP. Seismic-reflection profiles place the core in glacial-marine and marine sediments within one meter of the underlying glacial till. Foraminifers in the earliest glacial-marine sediments provide a record of ice-distal conditions and immigration of slope species onto the shelf in association with warm Atlantic water. Meltwater increased during the Allerød under a weakened Atlantic water influence. Arctic conditions began by 11.14 ₁₄C ka BP with an abrupt increase in meltwater and near exclusion of boreal fauna from the shelf. Meltwater diminished in the early Younger Dryas, coinciding with sea-surface cooling between 11.14 and 10.5 ¹⁴C ka BP. A slight warming recorded in the uppermost glacial-marine sediments was interrupted by an inferred jökulhlaup event emanating from glacier ice on the Western Volcanic Zone. Retreat of the ice margin from the sea sometime between c. 10.3 and 9.94 ¹⁴C ka BP coincided with this event. The onset of postglacial marine sedimentation occurred along with increasing evidence of Atlantic water c. 9.94 ¹⁴C ka BP and was interrupted by a short-lived Pre-boreal cooling of the Irminger Current c. 9.91 ¹⁴C ka BP. Conditions similar to those today were established by 9.7 ¹⁴C ka BP.  相似文献   

The 'common vole' in Svalbard identified as Microtus epiroticus by chromosome analysis     

KARL FREDGA  MAARIT JAAROLA  ROLF ANKER IMS  HARALD STEEN  NIGEL G. YOCCOZ 《Polar research》1990,8(2):283-290

The chromosomes were studied in six individuals from a population of Microtus from Grumantbyen, Svalbard, and in six Microtur arualis (Pallas 1778) from Lauwersee, Holland. It was shown that the voles from Svalbard did not belong, as earlier supposed, to the species M. arualis (2n = 46) but to M . epiroticus (Ondrias, 1966) (2n = 54). We suggest that the Svalbard voles were introduced by man between 1920 and 1960 together with hay on Russian ships from the vicinity of Leningrad, USSR.  相似文献