Radar Picture of Typhoon ‘Susan’ taken by a Ship on the China Sea,September 18, 1953     

Ernest Gherzi 《Pure and Applied Geophysics》1968,71(1):198-200

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Long-term variation of fiddler crab populations in North Carolina salt marshes     

Cammen  Leon M.  Seneca  Ernest D.  Stroud  Linda M. 《Estuaries and Coasts》1984,7(2):171-175

Estuaries and Coasts - Total biomass of the fiddler crabsUca pugnax andU. minax in fourSpartina marshes in the lower Cape Fear River estuary, North Carolina, declined by 65 to 70% between the...  相似文献   

The influence of morphology in determining the decomposition of two salt marsh macrophytes   总被引：1，自引：0，他引：1  

Karen L. McKee  Ernest D. Seneca 《Estuaries and Coasts》1982,5(4):302-309

Annual decomposition rates of Spartina alterniflora height forms and Juncus roemerianus were determined in situ in three North Carolina salt marshes using the litter bag method. The decomposition of Spartina was significantly influenced by size, i.e., height form, with the taller plants which had greater amounts of stem tissue, being more resistant to decay. Instantaneous decay rates for short and medium Spartina were not significantly different at any site, but they were both significantly greater than that of the tall form at two of the three study sites. Juncus decomposed more slowly than Spartina during the first 8 months, but had decomposed as completely as all three height forms of Spartina at two of the study sites by the end of the 13-month study period. Constant submergence appeared to inhibit decomposition since there was twice as much undecomposed plant material remaining in bags placed in tidal creeks as in those on the marsh surface.  相似文献   

Comparative Determination of Uranium In Silicates by Delayed Neutron Activation Analysis     

C.P. CONRAD  M.W. ROWE§  Ernest S. GLADNEY 《Geostandards and Geoanalytical Research》1982,6(1):1-4

Results of the measurement of uranium in silicate reference materials on the same samples at two different facilities, both using delayed neutron activation analysis, are compared. Good agreement was observed between the results of our two laboratories. Discrepancies have been observed occasionally between different laboratories which utilize delayed neutron activation analysis. On the basis of the results observed in this work, we conclude that discrepant results are not due to variations in the physical facilities of the laboratories.  相似文献   

Determination of Radium-226 in CCRMP Reference Samples by Independent Nuclear Methods     

Ernest S. GLADNEY  Wanita EBERHARDT  Richard J. PETERS 《Geostandards and Geoanalytical Research》1982,6(1):5-6

Radium-226 concentrations have been determined in 11 CCRMP reference rock and ore samples using instrumental gamma-ray spectrometry and radiochemical radon emanation procedures. Results are compared to the best available data.  相似文献   

Determination of Uranium in Seventeen CRPG Rock Reference Samples by Independent Nuclear Methods     

Daniel R. PERRIN  Ernest S. GLADNEY 《Geostandards and Geoanalytical Research》1982,6(1):7-9

Instrumental epithermal neutron activation analysis and delayed neutron assay have both been used to measure uranium in CRPG reference samples. Excellent agreement between the methods was achieved. Results are compared with data from other laboratories.  相似文献   

Estimating the world's potentially available cropland using a bottom-up approach   总被引：1，自引：0，他引：1  

E.F. Lambin  H.K. Gibbs  L. Ferreira  R. Grau  P. Mayaux  P. Meyfroidt  D.C. Morton  T.K. Rudel  I. Gasparri  J. Munger 《Global Environmental Change》2013,23(5):892-901

Previous estimates of the land area available for future cropland expansion relied on global-scale climate, soil and terrain data. They did not include a range of constraints and tradeoffs associated with land conversion. As a result, estimates of the global land reserve have been high. Here we adjust these estimates for the aforementioned constraints and tradeoffs. We define potentially available cropland as the moderately to highly productive land that could be used in the coming years for rainfed farming, with low to moderate capital investments, and that is not under intact mature forests, legally protected, or already intensively managed. This productive land is underutilized rather than unused as it has ecological or social functions. We also define potentially available cropland that accounts for trade-offs between gains in agricultural production and losses in ecosystem and social services from intensified agriculture, to include only the potentially available cropland that would entail low ecological and social costs with conversion to cropland. In contrast to previous studies, we adopt a “bottom-up” approach by analyzing detailed, fine scale observations with expert knowledge for six countries or regions that are often assumed to include most of potentially available cropland. We conclude first that there is substantially less potential additional cropland than is generally assumed once constraints and trade offs are taken into account, and secondly that converting land is always associated with significant social and ecological costs. Future expansion of agricultural production will encounter a complex landscape of competing demands and tradeoffs.  相似文献   

Simulation of severe thunder storm event: a case study over Pune,India     

S. Fadnavis  Medha Deshpande  Sachin D. Ghude  P. Ernest Raj 《Natural Hazards》2014,72(2):927-943

Numerical simulation of a typical tropical thunder storm event at Pune (18.53°N, 73.85°E), India, has been performed using the three nested domain configuration of Weather Research and Forecasting-Advanced Research Weather Model (version 3.2). The model simulations have been compared with observations. Sensitivity to cumulus parameterization schemes, namely Betts–Miller (BM), Grell–Devenyi (GD), and Kain–Fritsch (KF), for simulation of vertical structure and time evolution of weather parameters has been evaluated using observations from automatic weather station and global positioning system radiosonde ascents. Comparison of spatial distribution of 24-h accumulated rain with Tropical Rainfall Measuring Mission data shows that BM scheme could simulate better rain than GD and KF schemes. The BM scheme could well simulate the development of storm and heavy rain as it could generate sufficiently humid and deep layer in the lower and middle atmosphere, along with co-existence of updrafts and downdrafts and frozen hydrometeors at the middle level and rain water near the surface.  相似文献   

Results from a sixteen year study on the effects of oiling from the Exxon Valdez on adult pink salmon returns     

Brannon EL  Maki AW  Moulton LL  Parker KR 《Marine pollution bulletin》2006,52(8):892-899

For sixteen years following the 1989 Exxon Valdez oil spill adult returns of pink salmon in Prince William Sound, Alaska were monitored to assess spill effects on survival. No evidence of spill effects was detected for either intertidal or whole-stream spawning fish. From 1989 through 2004 mean densities for oiled and reference streams tracked each other, illustrating similar responses of oiled and reference stream adult populations to naturally changing oceanographic and climactic conditions. Hatchery fish strayed into the study streams, but similar incursions occurred in oiled and reference streams, and their presence was compensated for to eliminate their influence on determining the success of the returning natural populations. These results, showing no detectable effects of oiling on pink salmon spawning populations, are supported by published field studies on pink salmon incubation success in oiled streams.  相似文献