Micro-erosion meter modified for use under water     

Robert W. Askin  Robin G.D. Davidson-Arnott 《Marine Geology》1981,40(3-4):M45-M48

Modifications, resulting in increased simplicity and ruggedness, have been made to the design of a micro-erosion meter to permit it to be used under water by SCUBA divers. In its modified form the instrument has been used successfully in a study measuring rates of nearshore erosion in overconsolidated glacial till.  相似文献   

Concentrations of the elements Ag,Al, Ca,Cd, Cu,Fe, Mg,Mn, Pb and Zn,and the radionuclides ²¹⁰Pb and ²¹⁰Po in the digestive gland of the squid Nototodarus gouldi     

J. David Smith  Lorraine Plues  Mireille Heyraud  Robin D. Cherry 《Marine environmental research》1984,13(1):55-68

Ag, Al, Ca, Cd, Cu, Fe, Mg, Mn, Pb and Zn concentrations and ²¹⁰Po and ²¹⁰Pb activities were measured in 26 specimens of the squid Nototodarus gouldi taken from the waters of Bass Strait in one jigging operation. All the elements show wide ranges in concentrations in specimens apparently subject to the same environmental conditions. Copper concentration was 27-1 200 μg/g, and ²¹⁰Po activity 4·8–24·2 Bq/g. The animal wet weights, the elements Ag, Al, Cd, Fe and Zn, and the radionuclide ²¹⁰Po have coefficients of variation in the range 40–60%; Ca, Mg and Mn show the smallest variability (CV = < 30%), and Cu the greatest (CV = 12%). Significant correlations (p < 0·001) were found between the following pairs of elements: Cd-Zn, Cd-Cu, Zn-Cu, Mg-Mn, Fe-Mn, Ca-Mg and Fe-²¹⁰Po.  相似文献   

Wave behavior in the solar photosphere: A comparison of theory and observation     

Marmolino  Ciro  Stebbins  Robin T. 《Solar physics》1989,124(1):23-36

We report detailed comparisons between theoretical and empirical eigenfunctions of velocity and intensity for the 5-min modes in the photosphere. The comparison process is accomplished by obtaining synthetic profiles of the Fei 5434 Å line in the presence of waveforms given by dynamical calculations and then applying a common procedure of reduction both to the observed and to the synthetic data. For the velocity waveforms, our results show a general agreement between theory and observations together with some systematic differences; in particular the theory systematically underestimates the observations in the low photosphere. These systematic differences are stressed by the intensity results since both the computed amplitudes and phases appear to be wrong in the deeper layers.  相似文献   

Layers and gaps: the nature of the stratigraphical record          下载免费PDF全文

Robin Bailey 《Geology Today》2017,33(1):24-31

The fundamentals of stratigraphy have been well understood for more than three centuries and there is now a detailed stratigraphical record reaching back more than one billion years. But this sedimentary rock record is everywhere unpredictably incomplete and yet everywhere similar in its layered character. Computer analyses now reveal the fundamental nature of these two aspects of the record: gaps and layers are governed by simple, seemingly universal, laws that operate regardless of age and sediment type.  相似文献   

Governance characteristics of large marine ecosystems     

Robin Mahon  Lucia Fanning  Patrick McConney  Richard Pollnac 《Marine Policy》2010

The Large Marine Ecosystem (LME) concept is widely established as a large-scale approach to coastal and marine management. LME-oriented activities have focused mainly on natural sciences. Socioeconomic and governance aspects have only recently been receiving increased attention. The 64 LMEs that have been defined appeared to exhibit considerable diversity in characteristics that would be expected to affect governability. This paper explores two questions: (1) Do the LMEs vary widely enough in geopolitical complexity that different approaches to governance may be required for different LMEs? (2) Are there groups of LMEs within which one might take similar approaches to governance? The analysis demonstrates that there is considerable heterogeneity among LMEs with regard to characteristics that would be expected to affect governability. It concludes that a diversity of governance approaches will be required to cope with this heterogeneity. It also appears that LMEs can be grouped according to these characteristics. This suggests that different approaches could be considered for clusters rather than for individual LMEs and that there can be sharing of experience and learning within clusters. The types of relationships between features of LMEs and the ‘best’ approaches to marine governance are discussed in the context of emerging governance ideas.  相似文献   

Human migration and occupation of Eurasia     

Robin W. Dennell 《《幕》》2008,31(2):207-210

The main current benefit of collaboration between Quaternary scientists and palaeoanthropologists （especially palaeolithic archaeologists） lies in providing a unique perspective on how human populations respond to longterm climate change. Eurasia has a superlative record of climatic changes over the last two million years, and an archaeological record that is regionally variable in quality, but which is drawn from a wide range of environmental and chronological contexts.  相似文献   

Natural disasters and 150th commemoration of Canada as a country     

Agrawal  Nirupama  Cox  Robin 《Natural Hazards》2019,98(1):3-7

  相似文献   

Quantifying groundwater–surface water interactions in a proglacial valley,Cordillera Blanca,Peru          下载免费PDF全文

Lauren D. Somers  Ryan P. Gordon  Jeffrey M. McKenzie  Laura K. Lautz  Oliver Wigmore  AnneMarie Glose  Robin Glas  Caroline Aubry‐Wake  Bryan Mark  Michel Baraer  Thomas Condom 《水文研究》2016,30(17):2915-2929

A myriad of downstream communities and industries rely on streams fed by both groundwater discharge and glacier meltwater draining the Cordillera Blanca, Northern Peruvian Andes, which contains the highest density of glaciers in the tropics. During the dry season, approximately half the discharge in the region's proglacial streams comes from groundwater. However, because of the remote and difficult access to the region, there are few field methods that are effective at the reach scale to identify the spatial distribution of groundwater discharge. An energy balance model, Rhodamine WT dye tracing, and high‐definition kite‐borne imagery were used to determine gross and net groundwater inputs to a 4‐km reach of the Quilcay River in Huascaran National Park, Peru. The HFLUX computer programme ( http://hydrology.syr.edu/hflux.html ) was used to simulate the Quilcay River's energy balance using stream temperature observations, meteorological measurements, and kite‐borne areal photography. Inference from the model indicates 29% of stream discharge at the reach outlet was contributed by groundwater discharge over the study section. Rhodamine WT dye tracing results, coupled with the energy balance, show that approximately 49% of stream water is exchanged (no net gain) with the subsurface as gross gains and losses. The results suggest that gross gains from groundwater are largest in a moraine subreach but because of large gross losses, net gains are larger in the meadow subreaches. These insights into pathways of groundwater–surface water interaction can be applied to improve hydrological modelling in proglacial catchments throughout South America. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Planning for resettlement: building partnerships for,by, and with Indigenous peoples     

Kumasaka  Osamu  Bronen  Robin  Harrington  Elise  Knox-Hayes  Janelle  Laska  Shirley  Naquin  Albert  Patrick  Andy  Peterson  Kristina  Tom  Stanislaus 《GeoJournal》2021,87(2):307-327

Efforts in the United States to plan or implement relocation in response to climate risks have struggled to improve material conditions for participants, to incorporate local knowledge, and to keep communities intact. Mixed methodologies of community geography provide an opportunity for dialogue and knowledge-sharing to collaboratively diagnose the challenges of climate adaptation led by communities. In this article, we advance a participatory practice model for the co-creation of knowledge initiated during a two-day workshop with members from the Biloxi-Chitimacha-Choctaw Tribe from Isle de Jean Charles in Louisiana, Yup’ik people from Newtok Village in Alaska, and researchers from the MIT Resilient Communities Lab. Building on prior scholarship of indigenizing climate change research, this article shares the experience of the workshop to support knowledge exchange and dialogue, with the goal of understanding how to build participatory and non-extractive community-academic partnerships. We reflect on the community values and principles used to guide this workshop to inform more inclusive and co-produced research partnerships, and pedagogies that can improve and assist the self-determination of groups impacted by climate change. Workshop presentations and discussions highlight interconnected themes of resources, systems & structures, regulatory imbalance, and resilience that underpin climate resettlement. We reflect on the narratives presented by members of both Indigenous tribes and NGO partners that illustrate the shortcomings of resettlement planning practices past and present as perpetuating existing inequality. In response to this structured knowledge exchange, we identify potential roles for community-academic partnerships that aim to improve the equity of existing resettlement models. We propose approaches for incorporating traditional knowledge into the pedagogy, discourse, and practice of academic planning programs.

  相似文献   

Bioaccumulation and enantiomeric profiling of organochlorine pesticides and persistent organic pollutants in the killer whale (Orcinus orca) from British and Irish waters   总被引：1，自引：0，他引：1  

McHugh B  Law RJ  Allchin CR  Rogan E  Murphy S  Foley MB  Glynn D  McGovern E 《Marine pollution bulletin》2007,54(11):1724-1731

Concentrations and enantiomeric profiles for a range of organochlorine compounds are reported in blubber samples from a number of individual killer whales (Orcinus orca) from British and Irish waters. Elevated contaminant levels and enriched isotopic ratios were determined in one individual whale sampled in the Scottish Western Isles compared to the others suggesting marine mammal based dietary influences. The potential application of isotopic ratios to model contaminant uptake, enantioselective enrichment and accumulation is demonstrated. Data are presented which provide information on enantioselective enrichment factors (EFs) for o,p'-DDT, alpha-HCH and toxaphene congeners CHB26 and CHB 50. This dataset further improves the current database on reported levels of a number of contaminants and provides additional background information on potential metabolic processes in killer whales from British and Irish waters.  相似文献