Gulf of Mexico,ocean-color surface-truth measurements     

R. W. Austin 《Boundary-Layer Meteorology》1980,18(3):269-285

In October 1977, a major remote sensing experiment was conducted in the Gulf of Mexico, in preparation for the launch of NIMBUS-7 which carried the Coastal Zone Color Scanner. Two major vessels obtained surface-truth measurements, while two jet aircraft at altitudes of 12.5 and 19.5 km obtained images of the surrounding ocean in 10 spectral bands. Measurements obtained in the surface water from the NOAA vessel Researcher of the spectral downwelling irradiances, upwelling radiances, attenuation and scattering properties are described.  相似文献   

Zinc and copper levels in Belfast Lough     

M.S. McGrath  J. Austin 《Marine pollution bulletin》1979,10(3):86-88

A survey of dissolved zinc, copper, oxygen and biochemical oxygen demand in Belfast Lough has been carried out. Zinc and to a lesser extent copper occur at elevated levels compared with a non-industrialized area of the Irish Sea. Zinc levels are particularly high in the marginal waters of the north shore of the lough. Dissolved oxygen and biochemical oxygen demand levels indicate that pollution of the lough by oxygendemanding wastes is not a serious problem.  相似文献   

Book reviews     

Vecchione  Michael  Maples  Robert  Williams  Austin B.  Anderson  Franz E.  Herrgesell  Perry L. 《Estuaries and Coasts》1984,7(3):265-268

Estuaries and Coasts -  相似文献   

Strain localization in the Morcles nappe (Helvetic Alps, Switzerland)     

Nicholas Austin  Brian Evans  Marco Herwegh  Andreas Ebert 《Swiss Journal of Geoscience》2008,101(2):341-360

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Range-wide population structure and history of the northern quahog (Merceneria merceneria) inferred from mitochondrial DNA sequence data     

Baker  Patrick; Austin  James D.; Bowen  Brian W.; Baker  Shirley M. 《ICES Journal of Marine Science》2008,65(2):155-163

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Construction of the casa grande by sequential high precision C-14 dating     

Austin Long  John Andresen  Jeffrey Klein 《Geoarchaeology》1987,2(3):217-222

Two composite radiocarbon dates on wood beams from a unique, prehistoric building in southern Arizona are the result of growth series subsampling of the beams and statistical evaluation of radiocarbon dates on the subsamples. This procedure avoids some of the problems caused by secular variations in the biospheric ¹⁴C activity and by the dating of specimens grown over a range of years. This procedure yields results similar to more precise tree-ring dates from other sites in the southwestern United States. The procedure illustrated here is applicable to any archaeological tree specimen consisting of at least the last 40 growth rings.  相似文献   

Compositional variability of ice‐rafted debris in Heinrich layers 1 and 2 on the northwest European continental slope identified by environmental magnetic analyses     

John Walden  Emilie Wadsworth  William E. N. Austin  Clare Peters  James D. Scourse  Ian R. Hall 《第四纪科学杂志》2007,22(2):163-172

The composition of ice‐rafted debris (IRD) within a sediment core from the European continental slope (core OMEX‐2K; 49° 5′ N, 13° 26′ W) has been examined using environmental magnetic analyses. The data demonstrate compositional variability of the IRD within Heinrich layers 2 (H2) and 1 (H1) and these differences are most readily explained by changes in the contribution of different IRD sources to the core site. Some IRD within the main Heinrich layers show magnetic signatures that are similar to IRD derived from the Laurentide ice sheet found in cores from within the main North Atlantic IRD‐belt. In contrast, other IRD‐rich layers, both prior to and within the main Heinrich layers, demonstrate different magnetic behaviour, suggesting a contribution from a non‐Laurentide sourced IRD, most likely derived from ice streams discharging from northeast Atlantic ice sheets such as the British and Fennoscandian ice sheets. These data are consistent with published compositional data from the same core and, given the rapid, highly sensitive and non‐destructive nature of the method, suggest that environmental magnetic analysis has considerable potential for characterising IRD materials within Heinrich layers for the purposes of defining provenance. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Fine-scale acoustic tomographic imaging of shallow water sediments     

Dezhang Chu Dajun Tang Austin  T.C. Hinton  A.A. Arthur  R.I.  Jr. 《Oceanic Engineering, IEEE Journal of》2001,26(1):70-83

In acoustic tomographic system capable of performing in situ two-dimensional (2D) acoustic imaging of shallow water sediments is described. This system is capable of resolving inhomogeneities greater than 10 cm and differentiating sound-speed variations greater than 2%, A tomographic inversion is performed in a 2D vertical slice of about 1 m ² (1 m×1 m) using three identical probes, with each consisting of 70 evenly distributed transducers. In normal deployments, two of the probes are oriented vertically and are separated by about 1 meter, and the third is positioned horizontally right above the two vertical probes. The additional horizontal probe greatly improves the horizontal resolution of the system compared to conventional crosshole tomographic setups. Numerical simulations are performed to evaluate the influences of arrival time detection error and transducer position error on the performance of the tomography system. For an arrival time of 500 ns (standard deviation) and a position error of 4 mm (standard deviation), sound-speed anomalies of greater than 0.8% can be correctly predicted near the upper portion (close to the horizontal probe) and are resolvable near the lower portion. A controlled laboratory experiment was conducted to evaluate the performance of the system. The location of a polyurethane block (Conap EN22) used as a known target is correctly predicted while the inverted sound speed is about 9% lower than that from its actual value. Field data taken from a saturated muddy site are presented and analyzed. The inverted mean sound speed and attenuation are about 1480 ms^-1 and 20 dBm^-1, respectively  相似文献   

Modelling Holocene tides on the NW European continental shelf     

Roger M. Austin 《地学学报》1991,3(3):276-288

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Macrofossil evidence of alder (Alnus sp.) in Britain early in the Late Glacial Interstadial: implications for the northern cryptic refugia debate     

D. S. Young  C. P. Green  C. R. Batchelor  P. Austin  S. A. Elias  J. Athersuch  P. Lincoln 《第四纪科学杂志》2021,36(1):40-55

Wood macrofossil remains of alder and willow/poplar have been recovered from a sediment sequence in the valley of the Turker Beck in the Vale of Mowbray, North Yorkshire. These remains have yielded radiocarbon dates early in the Devensian Late Glacial (14.7–14k cal a bp ), equivalent to the early part of the Greenland Interstadial (GI-1e) of the GRIP ice-core record. These are the earliest dates recorded for the presence of alder in the Late Glacial in the British Isles. Associated biological remains have provided a palaeoenvironmental record for this early part of the Greenland Interstadial, generally indicative of open environments dominated by herbaceous taxa on both the wetland and dryland surfaces. However, stands of alder, birch and willow woodland were also present, and indicate the possibility that such tree species survived in cryptic refugia in Britain as elsewhere in northern Europe during the Last Glacial Maximum. The absence of alder pollen at Turker Beck, in a sequence in which its macrofossil remains are relatively abundant, lends support to the view that pollen can be a poor indicator of the presence of tree species in Late Glacial sequences in northern and western Europe.  相似文献