American Geophysical Union (AGU)

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Wind‐driven inner‐shelf circulation off central Oregon during summer
American Geophysical Union (AGU) - Tập 110 Số C10 - 2005
Anthony Kirincich, John A. Barth, Brian A. Grantham, Bruce A. Menge, Jane Lubchenco
Velocity measurements from 17 deployments of moored acoustic Doppler current profilers obtained during four summer upwelling seasons are used to describe the cross‐shelf divergence of Ekman transport in the inner shelf off Oregon. For each deployment the measured surface and bottom cross‐shelf transports were compared with estimates of the theoretical Ekman transports to find the fraction ...... hiện toàn bộ
Partition coefficients of Hf, Zr, and ree between phenocrysts and groundmasses
American Geophysical Union (AGU) - Tập 89 Số S02 - 1984
Haruyuki Fujimaki, M. Tatsumoto, Kenichiro Aoki
Partition coefficients of Hf, Zr, and REE between olivine, orthopyroxene, clinopyroxene, plagioclase, garnet, amphibole, ilmenite, phlogopite, and liquid are presented. Samples consist of megacrysts in kimberlite, phenocrysts in alkaline basalts, tholeiitic basalts and andesitic to dacitic rocks, and synthetic garnet and clinopyroxene in Hawaiian tholeiites. The Hf‐Lu and Zr‐Lu elemental f...... hiện toàn bộ
Patterns of ocean current variability on the West Florida Shelf using the self‐organizing map
American Geophysical Union (AGU) - Tập 110 Số C6 - 2005
Yonggang Liu, Robert H. Weisberg
Patterns of ocean current variability are examined on the West Florida Shelf by a neural network analysis based on the self‐organizing map (SOM), using time series of moored velocity data that span the interval October 1998–September 2001. Three characteristic spatial patterns are extracted in a 3 × 4 SOM array: spatially coherent southeastward and northwestward flow patterns with strong c...... hiện toàn bộ
An upwelling case study on Florida's west coast
American Geophysical Union (AGU) - Tập 105 Số C5 - Trang 11459-11469 - 2000
Robert H. Weisberg, B. Black, Zhenjiang Li
Using a combination of satellite sea surface temperature imagery; in situ currents, temperature, and sea level data; and a numerical circulation model, we describe an upwelling event observed along Florida's west coast. Although ubiquitous features of continental shelves, descriptions of coastal upwellings (or downwellings) are generally complicated by the continuum of processes in which t...... hiện toàn bộ
Vibrational kinetics of air plasmas induced by sprites
American Geophysical Union (AGU) - Tập 115 Số A5 - 2010
Francisco J. Gordillo‐Vázquez
The vibrational kinetics of air plasmas produced by the presence of sprites in the mesosphere of the Earth is studied in detail. The present model solves the coupled electron Boltzmann equation and rate equations for electrons, neutrals (ground and excited), and ions. Special attention is paid to the vibrational kinetics of N2 (X1Σg... hiện toàn bộ
Auroral N2 emissions and the effect of collisional processes on N2 triplet state vibrational populations
American Geophysical Union (AGU) - Tập 101 Số A1 - Trang 261-274 - 1996
J. S. Morrill, W. Benesch
Previous model results have shown that the N2 triplet vibrational level populations in the aurora are strongly affected by cascade and quenching by atomic and molecular oxygen. As the aurora penetrates to lower altitudes (less than 100 km) the role of quenching by atomic oxygen becomes less important and processes involving N2 collisions begin to p...... hiện toàn bộ
Intercomparison of oxygenated volatile organic compound measurements at the SAPHIR atmosphere simulation chamber
American Geophysical Union (AGU) - Tập 113 Số D20 - 2008
E. C. Apel, T. Brauers, R. Koppmann, Benjamin A. Musa Bandowe, J. Boßmeyer, C. Holzke, Ralf Tillmann, Andreas Wahner, Robert Wegener, A. Brunner, Markus Jocher, T. M. Ruuskanen, Christoph Spirig, D. Steigner, R. Steinbrecher, E. Álvarez, K. Müller, J. P. Burrows, Gunnar W. Schade, S. J. Solomon, A. Ladstätter‐Weißenmayer, Peter G. Simmonds, Dickon Young, James R. Hopkins, Alastair C. Lewis, Geir Legreid, Stefan Reimann, Armin Hansel, Armin Wisthaler, Robert S. Blake, Andrew M. Ellis, P. S. Monks, Kevin Wyche
This paper presents results from the first large‐scale in situ intercomparison of oxygenated volatile organic compound (OVOC) measurements. The intercomparison was conducted blind at the large (270 m3) simulation chamber, Simulation of Atmospheric Photochemistry in a Large Reaction Chamber (SAPHIR), in Jülich, Germany. Fifteen analytical instruments, representing a wid...... hiện toàn bộ
Major‐element abundances on the surface of Mercury: Results from the MESSENGER Gamma‐Ray Spectrometer
American Geophysical Union (AGU) - Tập 117 Số E12 - 2012
Larry G. Evans, P. N. Peplowski, E. A. Rhodes, D. J. Lawrence, T. J. McCoy, L. R. Nittler, Sean C. Solomon, A. L. Sprague, K. R. Stockstill‐Cahill, R. Starr, S. Z. Weider, W. V. Boynton, D. Hamara, J. Goldsten
Orbital gamma‐ray measurements obtained by the MESSENGER spacecraft have been analyzed to determine the abundances of the major elements Al, Ca, S, Fe, and Na on the surface of Mercury. The Si abundance was determined and used to normalize those of the other reported elements. The Na analysis provides the first abundance estimate of 2.9 ± 0.1 wt% for this element on Mercury's surface. The ...... hiện toàn bộ
Minor flux adjustment near mixing ratio extremes for simplified yet highly accurate monotonic calculation of tracer advection
American Geophysical Union (AGU) - Tập 105 Số D7 - Trang 9335-9348 - 2000
Chris J. Walcek
A simplified but very accurate method for calculating advection of mixing ratios in a mass conservative and absolutely monotonic manner in divergent or nondivergent multidimensional flows is presented. This scheme uses a second‐order‐accurate, upstream approximation with monotone limiters and additionally adjusts fluxes at two cell edges around local extremes of a tracer distribution to si...... hiện toàn bộ
Four climate change scenarios for the Indian summer monsoon by the regional climate model COSMO-CLM
American Geophysical Union (AGU) - Tập 116 Số D24 - Trang n/a-n/a - 2011
Andreas Dobler, Bodo Ahrens
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