The first Holocene relative sea-level curve from the middle part of Hardangerfjorden, western Norway     

ANDERS ROMUNDSET  ØYSTEIN S. LOHNE  JAN MANGERUD  JOHN INGE SVENDSEN 《Boreas: An International Journal of Quaternary Research》2010,39(1):87-104

Romundset, A., Lohne, Ø. S., Mangerud, J. & Svendsen, J. I. 2009: The first Holocene relative sea-level curve from the middle part of Hardangerfjorden, western Norway. Boreas , 10.1111/j.1502-3885.2009.00108.x. ISSN 0300-9483.
The first relative sea-level (RSL) curve from the mid-Hardangerfjorden area covering the entire Holocene is presented. The curve is based on a series of AMS ¹⁴C dates on terrestrial plant macrofossils across the isolation level in each of five lakes located between 3.5 and 74.5 m a.s.l. During the first 1200 years, the RSL fell very rapidly from the marine limit at 98 m a.s.l. to 33 m a.s.l., i.e. at a rate of 5.4 cm yr⁻¹. The emergence rate then slowed considerably and was close to standstill 8000–6500 cal. yr BP. However, an emergence of 16.5 m has taken place during the past 6000 years. Radiocarbon dates of terrestrial plant macrofossils from the basal strata in a lake above the marine limit and mollusc shells from glaciomarine silt in the isolation basins yielded a mean age for the local ice-margin retreat of 11 300 cal. yr BP. This verifies that Hardangerfjorden was glaciated during the Younger Dryas – an interpretation that has recently been disputed. The ice margin retreated at a rate of about 300 m yr⁻¹ from the position of the Younger Dryas moraine to this site some 60 km further into the fjord.  相似文献   

Sensitivity of atmosphere–ocean heat exchange and heat content in the North Sea and the Baltic Sea     

CORINNA SCHRUM  JAN O. BACKHAUS 《地球，A辑:动力气象学与海洋学》1999,51(4):526-549

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''Cosmogenic ¹⁰Be ages on the Pomeranian Moraine, Poland'': Reply to comments     

VINCENT R. RINTERKNECHT  LESZEK MARKS  JAN A. PIOTROWSKI  GRANT M. RAISBECK  FRANCOISE YIOU  EDWARD J. BROOK  PETER U. CLARK 《Boreas: An International Journal of Quaternary Research》2006,35(3):605-606

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WEATHER,GEOGRAPHY, AND VEHICLE‐RELATED HYPERTHERMIA IN CHILDREN*     

ANDREW GRUNDSTEIN  JAN NULL  VERNON MEENTEMEYER 《Geographical review》2011,101(3):353-370

Vehicle‐related hyperthermia is an unfortunate tragedy that leads to the accidental deaths of children each year. This research utilizes the most extensive dataset of child vehicle‐related hyperthermia deaths in the United States, including 414 deaths between 1998 and 2008. Deaths follow a seasonal pattern, with a peak in July and no deaths in December or January. Also, deaths occurred over a wide range of temperature and radiation levels and across virtually all regions, although most of them took place across the southern United States. In particular, the Phoenix, Houston, Dallas, and Las Vegas metropolitan areas had the greatest number of deaths. We utilize our vehicle hyperthermia index (vhi ) to compare expected deaths versus actual deaths in a metropolitan area, based on the number of children in the area who are under the age of five and on the frequency of hot days in the area. The vhi indicates that the Memphis, West Palm Beach‐Boca Raton, and Las Vegas metropolitan areas are the most dangerous places for vehicle‐related hyperthermia. We conclude by discussing several recommendations with public health policy implications.  相似文献   

Deforming bed conditions on the Danischer Wohld Peninsula, northern Germany': Comments     

JAN A. PIOTROWSKI  UTE DORING  ANJA HARDER  RASAQ QADIRIE  SUSANNE WENGHOFER 《Boreas: An International Journal of Quaternary Research》1997,26(1):73-77

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The Storegga tsunami along the Norwegian coast, its age and run up     

STEIN BONDEVIK  JOHN INGE SVENDSEN  GEIR JOHNSEN  JAN MANGERUD  PETER EMIL KALAND 《Boreas: An International Journal of Quaternary Research》1997,26(1):29-53

The statigraphy in 25 coastal lakes shows that most of the Norwegian coastline was impacted by a large tsunami about 7200 ¹⁴C BP. The methodology has been to core a staircase of lake basins above the contemporary sea level in several areas and to map the tsunami deposit to its maximum elevation. The tsunami was identified in the sedimentary record as an erosional unconformity overlain by graded or massive sand with shell fragments, followed by redeposited organic detritus. The greatest recorded runup along the coast (10–11 m above high tide) is found in areas most proximal to the Storegga slide scar on the Norwegian continental slope (Sunnmøre). To the north and south, runup is less, about 6–7 m at Bjugn (250 km north of Sunnmøre) and about 3–5 m in Austrheim (200 km to the south of Sunnmerre). This runup pattern supports the suggestion that the tsunami was generated by the Second Storegga Slide. The recorded runup heights are consistent within and between the investigated areas, and imply that the tsunami wave was not significantly influenced by the local topography, suggesting a very long wave length. The mapped runup estimates are in good agreement with a numerical model of the tsunami generated by the Second Storegga slide, and indicate that the slide was a single major event rather than a set of smaller slides.  相似文献   

Hydrographic changes in the southern Kattegat (Scandinavia) during the early Holocene transgression     

CHRISTIAN CHRISTIANSEN  KELD CONRADSEN  EMIL EMELYANOV  EGIS TRIMONIS  JAN HEINEMEIER  NIELS RUD 《Boreas: An International Journal of Quaternary Research》1993,22(4):349-356

Detailed sedimentological, micropalaeontological, mineralogical and geochemical investigations as well as ¹⁴C datings were carried out on a core from the southern part of the Kattegat Sea. According to the micropalaeontological interpretations, sea level rose by approximately 20 m in the period c. 9610 BP to 8200 BP. The core therefore provides evidence of the hydrographical conditions in the southern Kattegat during the early Holocene transgression. In the sediment there is geochemical evidence of strong stratification in the water column possibly related to inflow of saline water around 9080 BP. After the sediments dated to 8200 BP there is a hiatus followed by very young (<300 BP?) sediments. It is suggested that this hiatus might be associated with the opening of the Danish Straits.  相似文献   

Postglacial marine and lacustrine sediments in Lake Linnevatnet, Svalbard     

JOHN INGE SVENDSEN  JON Y. LANDVIK  JAN MANGERUD  GIFFORD H. MILLER 《Polar research》1987,5(3):281-283

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Naturgeografin i högskolan och samhället i Sverige     

JAN O. MATTSSON 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2013,113(1):4-6

Mattsson, Jan O.: Naturgeografin i högskolan och samhället i Sverige. Geografisk Tidsskrift 83: 4–6. Copenhagen, June 1, 1983.

Geography as a national science in Sweden: Research and University training as well as the aplication of geography in the community. 1982.  相似文献   

Prediction uncertainty of conceptual rainfall-runoff models caused by problems in identifying model parameters and structure     

STEFAN UHLENBROOK  JAN SEIBERT  CHRISTIAN LEIBUNDGUT  ALLAN RODHE 《水文科学杂志》2013,58(5):779-797

Abstract

The uncertainties arising from the problem of identifying a representative model structure and model parameters in a conceptual rainfall-runoff model were investigated. A conceptual model, the HBV model, was applied to the mountainous Brugga basin (39.9 km”) in the Black Forest, southwestern Germany. In a first step, a Monte Carlo procedure with randomly generated parameter sets was used for calibration. For a ten-year calibration period, different parameter sets resulted in an equally good correspondence between observed and simulated runoff. A few parameters were well defined (i.e. best parameter values were within small ranges), but for most parameters good simulations were found with values varying over wide ranges. In a second step, model variants with different numbers of elevation and landuse zones and various runoff generation conceptualizations were tested. In some cases, representation of more spatial variability gave better simulations in terms of discharge. However, good results could be obtained with different and even unrealistic concepts. The computation of design floods and low flow predictions illustrated that the parameter uncertainty and the uncertainty of identifying a unique best model variant have implications for model predictions. The flow predictions varied considerably. The peak discharge of a flood with a probability of 0.01 year^?1, for instance, varied from 40 to almost 60 mm day^?1. It was concluded that model predictions, particularly in applied studies, should be given as ranges rather than as single values.  相似文献