Geophysical Research Letters

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Direct simulation of electrical and hydraulic tortuosity in porous solids
Geophysical Research Letters - Tập 22 Số 17 - Trang 2333-2336 - 1995
Xiaodong Zhang, Mark Knackstedt
We directly evaluate the fluid‐flow and electrical conductivity of model three dimensional random porous medium at a microscopic level. This allows a direct test of the popular assumption that fluid‐flow and electrical current follow equivalent flow paths in porous solids. Visualisation of the fluid‐flow and electric‐current streamlines within identical porous sa...... hiện toàn bộ
Infrared reflectance spectra (2.2–15 μm) of plagioclase feldspars
Geophysical Research Letters - Tập 18 Số 6 - Trang 1151-1154 - 1991
Douglas B. Nash, John W. Salisbury
Laboratory results show that (1) the Christiansen frequency (CF) feature in mid‐infrared reflectance spectra of powders can be used to accurately distinguish plagioclase composition, and (2) the wavelength position of the CF is not affected by vitrification of the plagioclase. Although the CF position does not distinguish glass from crystalline forms of plagioclase, other features (combina...... hiện toàn bộ
Stratospheric NO2 and H2O mixing ratio profiles from high resolution infrared solar spectra using nonlinear least squares
Geophysical Research Letters - Tập 7 Số 7 - Trang 489-492 - 1980
E. Niple, William G. Mankin, Alan S. Goldman, D. G. Murcray, F. J. Murcray
Nonlinear least squares spectral curve fitting has been used to derive vertical mixing ratio profiles for NO2 and H2O above 16 km from high resolution (∼.02 cm−1) solar spectra collected during sunset with a balloon borne interferometer. The NO2 profile shows a sharp peak of ˜8 ppbv at 32 km falling rapidly...... hiện toàn bộ
Pre‐ and post‐fire behavioral trends revealed in satellite NDVI time series
Geophysical Research Letters - Tập 33 Số 14 - 2006
Luciano Telesca, Rosa Lasaponara
Pre‐ and post‐fire vegetational dynamical behaviours in a forest site of Northern Italy were investigated, using the 1998 to 2003 time series of Normalized Difference Vegetation Index (NDVI) from SPOT‐VEGETATION sensor. The detrended fluctuation analysis (DFA) was adopted to detect persistent behaviour, in order to characterize the stability/instability properties of vegetation dynamics. O...... hiện toàn bộ
Partial anhysteretic remanence and its anisotropy: Applications and grainsize‐dependence
Geophysical Research Letters - Tập 15 Số 5 - Trang 440-443 - 1988
Mike Jackson, William Gruber, Jim Marvin, Subir K. Banerjee
The distribution of remanence coercivities in a rock sample can be obtained by differentiating alternating field (AF) demagnetization curves of anhysteretic remanent magnetization (ARM); however, significant errors can be introduced by grain interactions and by the noise inherent in differentiation. We have found that 1) this error can be significantly reduced by measuring partial ARM's (p...... hiện toàn bộ
Rootless cones on Mars indicating the presence of shallow equatorial ground ice in recent times
Geophysical Research Letters - Tập 28 Số 12 - Trang 2365-2367 - 2001
P. D. Lanagan, A. S. McEwen, L. Keszthelyi, T. Thórdarson
High resolution Mars Orbiter Camera (MOC) images have revealed the existence of clusters of small cones in the Cerberus plains, Marte Valles, and Amazonis Planitia, Mars. These cones are similar in both morphology and planar dimensions to the larger of Icelandic rootless cones, which form due to explosive interactions between surficial lavas and near‐surface groundwater. Impact crater size...... hiện toàn bộ
Interdecadal modulation of PDO on the impact of ENSO on the east Asian winter monsoon
Geophysical Research Letters - Tập 35 Số 20 - 2008
Lin Wang, Wen Chen, Ronghui Huang
The interdecadal modulation of the Pacific Decadal Oscillation (PDO) upon the impact of the El Niño‐Southern Oscillation (ENSO) on the east Asian winter monsoon (EAWM) is investigated. When the PDO is in its high phase, there is no robust relationship between ENSO and EAWM on the interannual timescale. When the PDO is in its low phase, ENSO exerts strong impact on the EAWM, with robust and...... hiện toàn bộ
Definition of Antarctic Oscillation index
Geophysical Research Letters - Tập 26 Số 4 - Trang 459-462 - 1999
Daoyi Gong, Shaowu Wang
Following Walker's work about his famous three oscillations published during the 1920–30s, many papers were written about atmospheric oscillations. A fourth atmospheric oscillation in the middle and high southern latitudes was found, and named the Antarctic Oscillation (AO). AO refers to a large scale alternation of atmospheric mass between the mid‐latitudes and high latitudes surface pres...... hiện toàn bộ
The landslide‐generated tsunami of November 3, 1994 in Skagway Harbor, Alaska: A case study
Geophysical Research Letters - Tập 26 Số 19 - Trang 3009-3012 - 1999
Alexander B. Rabinovich, Richard E. Thomson, E. A. Kulikov, Brian D. Bornhold, I. Fine
We examine the origin and behavior of the catastrophic tsunami that impacted Skagway Harbor at the head of Taiya Inlet, Alaska, on November 3, 1994. Geomorphologic and tide gauge data, combined with numerical simulation of the event, reveal that the tsunami was generated by an underwater landslide formed during the collapse of a cruise‐ship dock undergoing construction. Use of a fine‐grid ...... hiện toàn bộ
Near‐field modeling of the July 17, 1998 tsunami in Papua New Guinea
Geophysical Research Letters - Tập 27 Số 19 - Trang 3037-3040 - 2000
Philippe Heinrich, A. Piatanesi, Emile A. Okal, Hélène Hébert
Modest earthquakes may trigger large submarine landslides, responsible for disastrous tsunami waves, as demonstrated by the Papua New Guinea event of July 17, 1998. The relatively small earthquake was followed by unexpectedly high waves, up to 15 m, wiping out 3 villages and killing more than 2200 people. Numerical simulations show that seismic dislocation sources are not energetic enough ...... hiện toàn bộ
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