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Mass budgets of the Lambert, Mellor and Fisher Glaciers and basal fluxes beneath their flowbands on Amery Ice Shelf

Science China Earth Sciences 2007年第11期50卷 1693-1706页

作者： Kenneth C. JEZEK Beata M. CSATHó Ute C. HERZFELD Katy L. FARNESS Philippe HUYBRECHTS Byrd Polar Research Center The Ohio State University Columbus OH 43210 USA CIRES/NSIDC University of Colorado Boulder Boulder CO 80309-0449 USA departement geografie Vrije Universiteit Brussel Pleinlaan 2 B-1050 Brussels Belgium Alfred-Wegener-Institut für Polar-und Meeresforschung Postfach 120161 D-27515 Bremerhaven Germany

We used in situ measurements and remote-sensing data sets to evaluate the mass budgets of the Lambert, Mellor and Fisher Glaciers and the basal melting and freezing rates beneath their flowbands on the Amery Ice Shelf. Our findings show the Lambert and Mellor Glaciers upstream of the ANARE Lambert Glacier Basin (LGB) traverse may have positive imbalances of 3.9±2.1 Gt a-1 and 2.1±2.4 Gt a-1, respectively, while the Fisher Glacier is approximately in balance. The upstream region as a whole has a positive imbalance of 5.9±4.9 Gt a-1. The three same glaciers downstream of the ANARE LGB traverse line are in negative imbalance, where the whole downstream region has a negative imbalance of -8.5±5.8 Gt a-1. Overall the mass budgets of the Lambert, Mellor, and Fisher Glaciers are close to bal-ance, and the collective three-glacier system is also nearly in balance with a mass budget of -2.6±6.5 Gt a-1. The significant positive imbalances for the interior basin upstream of the ice-movement stations established in the early 1970s (GL line) reported previously are possibly due to an overestimate of the total accumulation and an underestimate of the ice flux through the GL line. The mean melting rate is -23.0±3.5 m ice a-1 near the southern grounding line, which decreases rapidly downstream, and transitions to refreezing at around 300 km from the southern extremity of the Amery Ice Shelf. Freezing rates along the flowbands are around 0.5±0.1 to 1.5±0.2 m ice a-1. The per-centage of ice lost from the interior by basal melting beneath the flowbands is about 80%±5%. The total basal melting and refreezing beneath the three flowbands is 50.3±7.5 Gt ice a-1 and 7.0±1.1 Gt ice a-1, respectively. We find a much larger total basal melting and net melting than the results for the whole Amery Ice Shelf derived from previous modeling and oceanographic measurements.

关键词： mass budget basal melting and freezing Lambert Glacier Basin Amery Ice Shelf East Antarctica

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The Global Boundary Stratotype Section and Point for the base of the Danian Stage （Paleocene, Paleogene,＂Tertiary＂, Cenozoic） at El Kef, Tunisia—Original definition and revision

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Episodes 2006年第4期29卷 263-273页

作者： Eustoquio Molina Laia Alegret Ignacio Arenillas José A. Arz Njoud Gallala Jan Hardenbol Katharina von Salis Etienne Steurbau Noeel Vandenberghe Dalila Zaghbib-Turki Departamento de Ciencias de la Tierra Universidad de Zaragoza. E-50009 Zaragoza Spain. Département de Geologie Faculté des Sciences de Tunis 2092 Tunis El Manar Tunisia. Global Sequense Chronostratigraphy Inc. 826 Plainwood Drive Houston Texas 77079-4227 USA. Via Maistra 9 CH-7513 Silvaplana Switzerland. Royal Belgian Institute of Natural Sciences Vautierstraat 29 B-1000 Brussels Belgium. departement geografie-Geologle Afdeling Geologie B-3000 Leuven Belgium.

The Cretaceous/Paleogene （K/Pg） Working Group, after many years of studies, voted to define the Global Stratotype Section and Point （GSSP） for the base of the Danian Stage at the base of the boundary clay at a section near El Kef Tunisia. The GSSP was approved by the International Commission on Stratigraphy （ICS） and ratified by the International Union of Geological Sciences （IUGS） in 1991. Nevertheless, the GSSP was not officially published, although some papers dealing with geological aspects of the K/Pg boundary at El Kef have been published and this is quite well known. In April 2006, the GSSP was revisited, a marker was put in place and protection of the site was requested. Many correlation criteria are present at the GSSP of which the most useful are the meteorite impact evidence （iridium anomaly, Ni-rich spinel, etc.） and the mass extinction of planktic micro- and nannofossils. This event coincides with the GSSP, allowing us to propose that the K/Pg boundary is marked exactly by the moment of the meteorite impact, which implies that all the sediments generated by the impact belong to the Danian. This definition solves problems of correlation in the Yucatan peninsula （Mexico） and its surroundings.

关键词：全球层型解剖面和点古新世第三纪新生界地质环境

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南极Lambert,Mellor和Fisher冰川的物质平衡及Amery冰架底部物质通量的估算

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中国科学（D辑） 2007年第9期37卷 1192-1204页

作者：温家洪 Kenneth C.Jezek Beata M.Csathó Ute C.Herzfeld Katy L.Farness Philippe Huybrechts 上海师范大学地理系 Byrd Polar Research Center The Ohio State UniversityColumbusOH 43210USA CIRES/NSIDC University of Colorado BoulderBoulderCO 80309-0449USA departement geografie Vrije Universiteit BrusselPleinlaan 2B-1050BrusselsBelgium Alfred-Wegener-Institut für Polarund MeeresforschungPostfach 120161D-27515 BremerhavenGermany

利用现场观测与遥感数据对Lambert,Mellor和Fisher冰川的物质平衡及其在Amery冰架的底部融化与冻结状况进行了估算.结果表明,澳大利亚组织的Lambert冰川盆地(LGB)考察路线的上游地区,Lambert与Mellor冰川分别为(3.9±2.1)和(2.1±2.4)Gt... 详细信息

利用现场观测与遥感数据对Lambert,Mellor和Fisher冰川的物质平衡及其在Amery冰架的底部融化与冻结状况进行了估算.结果表明,澳大利亚组织的Lambert冰川盆地(LGB)考察路线的上游地区,Lambert与Mellor冰川分别为(3.9±2.1)和(2.1±2.4)Gt·a-1的正平衡,而Fisher冰川基本处于平衡状态.上游地区总的正平衡为(5.9±4.9)Gt·a-1.考察路线以下,3条冰川均处于负平衡,总的负平衡为(-8.5±5.8)Gt·a-1.整个Lambert,Mellor和Fisher冰川均接近于平衡状态.3条冰川总净平衡为(-2.6±6.5)Gt·a-1.前人认为GL线(1970年代初澳大利亚在LGB建立的冰川运动观测点的连线)以上的内陆盆地处于显著正平衡,可能是因为过高地估算了总积累量,并低估了穿过GL线的冰通量.靠近Amery冰架南端着地线,冰架底部的平均融化速率为(-23.0±3.5)m冰·a-1,向下游方向快速减小,并在距冰架最南端约300km处过渡为底部冻结.沿3条冰川在Amery冰架的冰流带(flowband),冻结速率约介于(0.5±0.1)^(1.5±0.2)m冰·a-1.由于冰流带底部的融化,流入冰架的内陆冰损失了大约80%±5%.3条冰流带底部总融化和总冻结分别为(50.3±7.5)和(7.0±1.1)Gt冰·a-1,这要比前人通过模拟和海洋观测估算的整个Amery冰架底部总融化和总冻结还要大很多.

关键词：物质平衡底部融化与冻结 Lambert冰川盆地 Amery冰架南极

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