Audience Response to Session IX — Waterborne Disease     

Elmer E. Jones Jr.   《Ground water》1979,17(2):198-198

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DISCUSSION OF "Grout-Induced Temperature Rise Surrounding Wells," by Fred J. Molz and Carl E. Kurt, May-June 1979 issue, v. 17, no. 3, pp. 264-269     

Elmer E. Jones Jr.   《Ground water》1979,17(5):502-502

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Strontium isotopic geochemistry of intrusive rocks,Puerto Rico,Greater Antilles     

Lois M. Jones  Stephen E. Kesler 《Earth and Planetary Science Letters》1980,50(1):219-224

The strontium isotopic geochemistry is given for three Puerto Rican intrusive rocks: the granodioritic Morovis and San Lorenzo plutons and the Rio Blanco stock of quartz dioritic composition. The average calculated initial⁸⁷Sr/⁸⁶Sr ratios are 0.70370, 0.70355 and 0.70408, respectively. In addition, the San Lorenzo data establish a whole-rock isochron of71 ± 2m.y., which agrees with the previously reported K-Ar age of 73 m.y. Similarity of most of the intrusive rocks in the Greater Antilles with respect to their strontium isotopic geochemistry regardless of their major element composition indicates that intrusive magmas with a wide range of composition can be derived from a single source material. The most likely source material, in view of the available isotopic data, is the mantle wedge overlying the subduction zone.  相似文献   

Tests for size and shape dependency in deep-sea mixing     

W.F. Ruddiman  G.A. Jones  T.-H. Peng  L.K. Glover  B.P. Glass  P.J. Liebertz 《Sedimentary Geology》1980,25(4):257-276

Bioturbation is generally not a strongly size-dependent or shape-dependent process in deep-sea sediments. Different sizes of ash (11–250 μm) deposited during a single eruption are usually mixed about equally, although in a few cores we found minor tendencies toward greater mixing of finer ash. Platey volcanic ash and spherical microtektites initially deposited within a few centimeters of each other in the sediment column are mixed with roughly comparable intensity. Radiocarbon dating of three sizes of CaCO₃ near the top of one box core produced ages within the analytical error; this also suggests no size dependency in the mixing process. Another core showed age differences opposite in sense to those that would be predicted if the finer fractions were more intensely mixed than the coarser fractions.The sizes examined (11–250 μm) encompass most of the sedimentary components used in paleoclimatic analyses of deep-sea cores. From these findings, we infer that significant artificial lead/lag offsets in paleoclimatic signals will not be created by size-selective or shape-selective mixing. Mixing models calibrated on one sediment size fraction should be generally applicable to other sizes and kinds of material.  相似文献   

Accurate Derivation of Total and Stratospheric Vertical Columns of NO2 from Ground-Based Zenith-Sky Measurements     

K. E. Preston  D. J. Fish  H. K. Roscoe  R. L. Jones 《Journal of Atmospheric Chemistry》1998,30(1):163-172

A new method for retrieving the vertical profile of NO2 from ground-based measurements is applied to four months of measurements made at Aberdeen (57°N) during part of SESAME from November 1994 to April 1995. The retrieval method is shown to be an invaluable tool both for deriving the true NO2 vertical column and for removing the tropospheric contribution to the vertical column. This dramatically reduces the effects of tropospheric pollution in the observations and enables a more appropriate comparison with stratospheric 3-D model results. The comparison confirms the accuracy of the model's transport and its reactive nitrogen photochemistry, although there are some detailed discrepancies.  相似文献   

Characterization of an Unregulated Landfill Using Surface-Based Geophysics and Geostatistics     

Wayne E. Woldt  Michael E. Hagemeister  David D. Jones 《Ground water》1998,36(6):966-974

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A numerical study of the topographic effect on electromagnetic fields in a three-dimensional conductivity model     

V. Ramaswamy  F. W. Jones  H. W. Dosso 《Pure and Applied Geophysics》1976,114(4):653-662

Summary The topographic effect on electromagnetic fields in a three-dimensional conductivity model is investigated using a finite-difference numerical method. The model is that of a conducting block buried in the host Earth beneath a conducting hill. The altitude effect as well as the effect of conductivity of the hill has been studied by comparing the results for the field components at the surface of the hill with those at the surface of a flat half-space. The results indicate that both altitude and the hill conductivity influence the behaviour of the electromagnetic fields. For certain traverses beyond the edge of the block, it is seen that the variations in some field components are mainly due to the topographic effect and that the contribution from the block itself is negligible.  相似文献   

Distribution of nutrient salts in the southern North Sea during early 1974     

A.R. Folkard  P.G.W. Jones 《Marine pollution bulletin》1974,5(12):181-185

Nutrient salt surveys in the southern North Sea have shown that the level of phosphate and nitrate off the continental coast during January, 1974 was two to three times higher than during the same period in 1962. The level of phosphate has also increased in the Thames Estuary but to a lesser degree. It is suggested that these increases are related to the discharge of waste material from terrestrial sources and that such changes must be considered in the context of eutrophication in the southern North Sea.  相似文献   

Introduction to modeling convection in planets and stars     

Chris Jones 《地球物理与天体物理流体动力学》2015,109(2):199-202

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Mapping complex vent eruptive activity at Santiaguito,Guatemala using network infrasound semblance     

K.R. Jones  J.B. Johnson 《Journal of Volcanology and Geothermal Research》2011,199(1-2):15-24

Pyroclastic-laden explosive eruptions from Santiaguito Volcano (Guatemala) are vented from the 200-m diameter Caliente Dome summit and result in a superposition of spatially extensive and temporally sustained (tens of seconds to minutes) acoustic sources. A network of infrasonic microphones distributed on various sides of the volcano record distinct waveforms, which are poorly correlated across the network and suggestive of acoustic interference from multiple sources. Presuming the infrasound wavefield is a linear superposition of spatially and temporally distinct sub-events, we introduce a semblance mapping technique to recover the time history of the spatially evolving sources during successive time windows. Coincident high-resolution video footage corroborates that both rapid dome uplift and individual explosive pulses are likely sources of high semblance infrasound that are identifiable during short (2 s) time windows. This study suggests that complex and network-variable infrasound waveforms are produced whenever a volcanic vent source dimension is large compared to the wavelength of the sound being produced. Non-compact infrasound radiators are probably commonplace at silicic volcanic systems, where venting often occurs across a dome surface.  相似文献