Modeling studies of the bioluminescence potential dynamics in a high Arctic fjord during polar night     

Shulman  Igor  Cohen  Jonathan H.  Moline  Mark A.  Anderson  Stephanie  Metzger  E. Joseph  Rowley  Clark 《Ocean Dynamics》2022,72(1):37-48

Ocean Dynamics - During polar nights in January 2012 and 2017, significantly higher bioluminescence (BL) potential emissions in the upper 50 m were observed in the fjord Rijpfjorden...  相似文献   

Biostratigraphy of large benthic foraminifera from Hole U1468A (Maldives): a CT-scan taxonomic approach     

Giovanni Coletti  Stephanie Stainbank  Alessio Fabbrini  Silvia Spezzaferri  Anneleen Foubert  Dick Kroon  Christian Betzler 《Swiss Journal of Geoscience》2018,111(3):523-536

Large benthic foraminifera are important components of tropical shallow water carbonates. Their structure, developed to host algal symbionts, can be extremely elaborate and presents stratigraphically-significant evolutionary patterns. Therefore their distribution is important in biostratigraphy, especially in the Indo-Pacific area. To provide a reliable age model for two intervals of IODP Hole U1468A from the Maldives Inner-Sea, large benthic foraminifera have been studied with computed tomography. This technique provided 3D models ideal for biometric-based identifications, allowing the upper interval to be placed in the late middle-Miocene and the lower interval in the late Oligocene.  相似文献   

The effects of climate sensitivity and carbon cycle interactions on mitigation policy stringency     

Katherine Calvin  Ben Bond-Lamberty  James Edmonds  Mohamad Hejazi  Stephanie Waldhoff  Marshall Wise  Yuyu Zhou 《Climatic change》2015,131(1):35-50

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Overview of the special issue: a multi-model framework to achieve consistent evaluation of climate change impacts in the United States     

Stephanie T. Waldhoff  Jeremy Martinich  Marcus Sarofim  Benjamin DeAngelo  Jim McFarland  Lesley Jantarasami  Kate Shouse  Allison Crimmins  Sara Ohrel  Jia Li 《Climatic change》2015,131(1):1-20

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Multi-platform Observations Characterizing the Afternoon-to-Evening Transition of the Planetary Boundary Layer in Northern Alabama,USA     

Stephanie M. Wingo  Kevin R. Knupp 《Boundary-Layer Meteorology》2015,155(1):29-53

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Long-Term Performance of an In Situ "Iron Wall" for Remediation of VOCs   总被引：10，自引：0，他引：10  

Stephanie F. O'Hannesin  Robert W. Gillham 《Ground water》1998,36(1):164-170

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Recognition and palaeoclimatic implications of late Quaternary niche glaciation in eastern Lesotho     

Stephanie C. Mills  Stefan W. Grab  Simon J. Carr 《第四纪科学杂志》2009,24(7):647-663

Geomorphic evidence of former glaciation in the high Drakensberg of southern Africa has proven controversial, with conflicting glacial and non‐glacial interpretations suggested for many landforms. This paper presents new geomorphological, sedimentological and micromorphological data, and glacier mass‐balance modelling for a site in the Leqooa Valley, eastern Lesotho, preserving what are considered to be moraines of a former niche glacier that existed during the Last Glacial Maximum (LGM). The geomorphology and macro‐sedimentology of the deposits display characteristics of both active and passive transport by glacial processes. However, micromorphological analyses indicate a more complex history of glacial deposition and subsequent reworking by mass movement processes. The application of a glacier reconstruction technique to determine whether this site could have supported a glacier indicates a reconstructed glacier equilibrium line altitude (ELA) of 3136 m a.s.l. and palaeoglacier mass balance characteristics comparable with modern analogues, reflecting viable, if marginal glaciation. Radiocarbon dates obtained from organic sediment within the moraines indicate that these are of LGM age. The reconstructed palaeoclimatic conditions during the LGM suggest that snow accumulation in the Drakensberg was significantly higher than considered by other studies, and has substantial relevance for tuning regional climate models for southern Africa during the last glacial cycle. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

Late Pleistocene dust deposition in the Patagonian steppe - extending and refining the paleoenvironmental and tephrochronological record from Laguna Potrok Aike back to 55 ka     

Torsten Haberzettl  Flavio S. Anselmetti  Sabine W. Bowen  Michael Fey  Christoph Mayr  Bernd Zolitschka  Daniel Ariztegui  Barbara Mauz  Christian Ohlendorf  Stephanie Kastner  Andreas Lücke  Frank Schäbitz  Michael Wille 《Quaternary Science Reviews》2009,28(25-26):2927-2939

Paleoenvironmental records extending well into the last glacial period are scarce in the steppe regions of southern South America. Here, we present a continuous record for the past 55 ka from the maar lake Laguna Potrok Aike (51°58′ S, 70°23′ W, southern Patagonia, Argentina). Previous studies on a sedimentary core from a lake level terrace near the northern margin of the lake covered parts of Oxygen Isotope Stage (OIS) 3 (59–29 ka) whereas a second core from the centre of the basin comprised the last 16 ka. Tephrostratigraphical constraints and OSL ages from a third core located below the lake level terrace provide the crucial piece to close the gap between the previous coring sites. High-resolution XRF and magnetic susceptibility as well as grain size data indicate a positive hydrological balance alongside with relatively high aeolian activity during the glacial which is contemporaneous with increased dust fluxes in Antarctica. This is therefore the first evidence for contemporaneity of aeolian deposition in both the target area (Antarctica) and in the major source area of Patagonia. During the Holocene climatic conditions driving sediment deposition seem to have been more variable and less dominated by wind compared to glacial times. The identification of a minor lake level lowering at approximately 4 cal ka BP allows to refine earlier paleoenvironmental reconstructions for the Holocene. Within error margins the OSL ages are consistent with published radiocarbon-dated records offering hence a valuable tool for further studies of the sediments from Laguna Potrok Aike. The new chronology confirms the age of three tephra layers up to now only found in Laguna Potrok Aike sediments and ascribed to OIS 3.  相似文献   

Wood enhances crayfish (Paranephrops planifrons) habitat in a forested stream     

Stephanie M. Parkyn  Mark A. Meleason  Robert J. Davies‐Colley 《新西兰海洋与淡水研究杂志》2013,47(3):689-700

The mechanisms of interaction between stream life and habitat are often complex and poorly understood. We explored the response of a freshwater crayfish (Paranephrops planifrons) to the functions of large wood with a view towards possible future use of wood in stream restoration in New Zealand. We compared three sub‐reach types within a native forest stream in the central North Island, New Zealand; complex wood‐rich, simple (straight) woodless, and geomorphically complex woodless. Stable logs embedded across the channel created considerable habitat heterogeneity, particularly diversity of substrate, water depths and velocities, that was associated with a significantly higher abundance and biomass of crayfish compared with a straight woodless reach. Although undercut banks in woodless sub‐reaches also supported abundant crayfish, wood increased the proportion of stream area used as habitat, apparently by providing surrogate edge habitat. Wood appeared to increase stream complexity by retaining streambed substrate and providing microhabitat with stable cover.  相似文献   

Climate science news in brief     

Stephanie Hänsel 《Environmental Earth Sciences》2013,69(4):1491-1494

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