Backyard spectroscopy and photometry of Titan, Uranus and Neptune     

Ralph D Lorenz  Jessica M DooleyJ.Doug West  Mitsugu Fujii 《Planetary and Space Science》2003,51(2):113-125

We present and discuss observations of Titan (photometry and spectroscopy) and Uranus and Neptune (spectroscopy only) obtained using off-the-shelf equipment, affordable and available to many amateur astronomers and small colleges. Spectral observations compare well with published results from front-line observatories, and some evidence of seasonal change is evident in both spectra and narrowband photometry. Scattered Saturn light presents a significant problem for Titan observations, in particular, for slitless spectroscopy, and our attempts to reproduce Titan's lightcurve have so far been unsuccessful.  相似文献   

Improvements in the integration of remote sensing and rock slope modelling     

Francioni  Mirko  Salvini  Riccardo  Stead  Doug  Coggan  John 《Natural Hazards》2018,94(2):975-977

Natural Hazards - Forests are always dangerous to fire in China’s forested regions, and forest fire hazard has long been a serious issue in China. Zhejiang province is one of the key forest...  相似文献   

The Science and Policy of the Verified Carbon Standard Methodology for Tidal Wetland and Seagrass Restoration     

Brian A. Needelman  Igino M. Emmer  Stephen Emmett-Mattox  Stephen Crooks  J. Patrick Megonigal  Doug Myers  Matthew P. J. Oreska  Karen McGlathery 《Estuaries and Coasts》2018,41(8):2159-2171

The restoration of tidal wetland and seagrass systems has the potential for significant greenhouse gas benefits, but project-level accounting procedures have not been available at an international scale. In this paper, we describe the Verified Carbon Standard Methodology for Tidal Wetland and Seagrass Restoration, which provides greenhouse gas accounting procedures for marsh, mangrove, tidal forested wetland, and seagrasses systems across a diversity of geomorphic conditions and restoration techniques. We discuss and critique the essential science and policy elements of the methodology and underlying knowledge gaps. We developed a method for estimating mineral-protected (recalcitrant) allochthonous carbon in tidal wetland systems using field-collected soils data and literature-derived default values of the recalcitrant carbon that accompanies mineral deposition. We provided default values for methane emissions from polyhaline soils but did not provide default values for freshwater, oligohaline, and mesohaline soils due to high variability of emissions in these systems. Additional topics covered are soil carbon sequestration default values, soil carbon fate following erosion, avoided losses in organic and mineral soils, nitrous oxide emissions, soil profile sampling methods, sample size, prescribed fire, additionality, and leakage. Knowledge gaps that limit the application of the methodology include the estimation of CH₄ emissions from fresh and brackish tidal wetlands, lack of validation of our approach for the estimation of recalcitrant allochthonous carbon, understanding of carbon oxidation rates following drainage of mineral tidal wetland soils, estimation of the effects of prescribed fire on soil carbon stocks, and the analysis of additionality for projects outside of the USA.  相似文献   

Oldrich Hungr (1947–2017)     

Doug VanDine  Scott McDougall  Matthias Jakob  Erik Eberhardt 《Landslides》2018,15(2):385-386

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Hydraulic modeling of the 2011 New Madrid Floodway activation: a case study on floodway activation controls   总被引：2，自引：2，他引：0  

Adam Luke  Brad Kaplan  Jeff Neal  Jeremiah Lant  Brett Sanders  Paul Bates  Doug Alsdorf 《Natural Hazards》2015,77(3):1863-1887

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The importance of population,climate change and CO2 plant physiological forcing in determining future global water stress     

Andrew Wiltshire  Jemma Gornall  Ben Booth  Emily Dennis  Pete Falloon  Gillian Kay  Doug McNeall  Carol McSweeney  Richard Betts 《Global Environmental Change》2013,23(5):1083-1097

Future levels of water stress depend on changes in several key factors including population, climate-change driven water availability, and a carbon dioxide physiological-forcing effect on evaporation and run-off. In this study we use an ensemble of the HadCM3 climate model forced with a range of future emissions scenarios combined with a simple water scarcity index to assess the contribution of each of these factors to the projected population living in water stress over the 21st century.Population change only scenarios increase the number of people living in water stress such that at peak global population 65% of people experience some level of water stress. Globally, the climate model ensemble projects an increase in water availability which partially offsets some of the impacts of population growth. The result is 1 billion fewer people living in water stress by the 2080s under the high end emissions scenarios than if population increased in the absence of climate change.This study highlights the important role plant-physiological forcing has on future water resources. The effect of rising CO₂ is to increase available water and to reduce the number of people living in high water stress by around 200 million compared to climate only projections. This effect is of a similar order of magnitude to climate change.  相似文献   

Modelling ice–bed coupling during a glacier speed‐up event: Haut Glacier d'Arolla,Switzerland     

Urs H. Fischer  Doug Mair  Jeffrey L. Kavanaugh  Ian Willis  Peter Nienow  Bryn Hubbard 《水文研究》2011,25(9):1361-1372

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Editorial Report 2011     

Doug Mountfort 《新西兰海洋与淡水研究杂志》2013,47(1)

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Decadal predictions of the cooling and freshening of the North Atlantic in the 1960s and the role of ocean circulation     

Jon Robson  Rowan Sutton  Doug Smith 《Climate Dynamics》2014,42(9-10):2353-2365

In the 1960s North Atlantic sea surface temperatures (SST) cooled rapidly. The magnitude of the cooling was largest in the North Atlantic subpolar gyre (SPG), and was coincident with a rapid freshening of the SPG. Here we analyze hindcasts of the 1960s North Atlantic cooling made with the UK Met Office’s decadal prediction system (DePreSys), which is initialised using observations. It is shown that DePreSys captures—with a lead time of several years—the observed cooling and freshening of the North Atlantic SPG. DePreSys also captures changes in SST over the wider North Atlantic and surface climate impacts over the wider region, such as changes in atmospheric circulation in winter and sea ice extent. We show that initialisation of an anomalously weak Atlantic Meridional Overturning Circulation (AMOC), and hence weak northward heat transport, is crucial for DePreSys to predict the magnitude of the observed cooling. Such an anomalously weak AMOC is not captured when ocean observations are not assimilated (i.e. it is not a forced response in this model). The freshening of the SPG is also dominated by ocean salt transport changes in DePreSys; in particular, the simulation of advective freshwater anomalies analogous to the Great Salinity Anomaly were key. Therefore, DePreSys suggests that ocean dynamics played an important role in the cooling of the North Atlantic in the 1960s, and that this event was predictable.  相似文献   

Natural Bioremediation of Organic Contaminants in Ground Water Cliffs-Dow Superfund Site   总被引：1，自引：0，他引：1  

Gary M. Kle&#;ka  John W. Davis  Doug R. Gray  Steve S. Madsen 《Ground water》1990,28(4):534-543

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