Zobrazeno 1 - 10
of 48
pro vyhledávání: '"David C. Lewellen"'
Publikováno v:
Monthly Weather Review. 150:1233-1246
Mobile, polarimetric radar data were collected on a series of tornadoes that occurred near Dodge City, Kansas. A poststorm survey revealed a series of tornadic debris swaths in several dirt fields and high-resolution pictures of the tornado documente
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7bc8ce83fba01341beafd64f253b63cd
https://doi.org/10.1175/mwr-d-21-0262.1
https://doi.org/10.1175/mwr-d-21-0262.1
Autor:
David J. Bodine, Caleb Fulton, Howard B. Bluestein, Robert D. Palmer, Takashi Maruyama, David C. Lewellen
Publikováno v:
Journal of the Atmospheric Sciences. 73:2783-2801
Past numerical simulation studies found that debris loading from sand-sized particles may substantially affect tornado dynamics, causing reductions in near-surface wind speeds up to 50%. To further examine debris loading effects, simulations are perf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::85d2796de4c6c998f6aed15c443c4946
https://doi.org/10.1175/jas-d-15-0188.1
https://doi.org/10.1175/jas-d-15-0188.1
Publikováno v:
Journal of the Atmospheric Sciences. 71:4399-4419
Large-eddy simulations with size-resolved microphysics are used to model persistent aircraft contrails and contrail-induced cirrus from a few wing spans behind the aircraft until their demise after many hours. Schemes for dynamic local ice binning an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e96987230a1bcb242bc1c0d5936dff8e
https://doi.org/10.1175/jas-d-13-0316.1
https://doi.org/10.1175/jas-d-13-0316.1
Publikováno v:
Earth and Planetary Science Letters. 383:7-15
Aeolian processes are the most active processes modifying the surface of Mars under present day climatic conditions. Besides wind streak changes and dune and ripple migrations, active dust devils occur frequently leaving numerous tracks on the Martia
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::06413db27f2feb9bc8931dd9ed8ffbe0
https://doi.org/10.1016/j.epsl.2013.09.033
https://doi.org/10.1016/j.epsl.2013.09.033
Autor:
John Cardy, David C. Lewellen
In conformal field theory on a manifold with a boundary, there is a short-distance expansion expressing local bulk operators in terms of boundary operators at an adjacent boundary. We show how the coefficients of such an expansion are given solely by
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a344c27cc565e05264945dce471602e4
https://ora.ox.ac.uk/objects/uuid:00b2d9dc-61f5-436f-a00a-493c50654575
https://ora.ox.ac.uk/objects/uuid:00b2d9dc-61f5-436f-a00a-493c50654575
Autor:
David C. Lewellen
Publikováno v:
Journal of the Atmospheric Sciences. 69:417-434
Motivated by simulations of slow-growing contrail cirrus, the solution of the diffusional growth equations for a population of spherical ice crystals or water droplets is reexamined. For forcing specified by the evolution of the total water content a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5049e8ee28155332475842db2fa444ee
https://doi.org/10.1175/jas-d-11-029.1
https://doi.org/10.1175/jas-d-11-029.1
Autor:
Andrew S. Ackerman, Steven K. Krueger, Margreet C. Vanzanten, Verica Savic-Jovcic, Kozo Nakamura, Sonja Weinbrecht, Hongli Jiang, Chin-Hoh Moeng, Mike A. Zulauf, David C. Lewellen, Christopher S. Bretherton, Jefferson R. Snider, Jean-Christophe Golaz, Andreas Chlond, Adrian Lock, Bjorn Stevens, Marat Khairoutdinov, Markus D. Petters
Publikováno v:
Monthly Weather Review
Photosynthesis rates and photosynthesis–leaf nutrient relationships were analysed in nine tropical grass and sedge species growing in three different ecosystems: a rain-fed grassland, a seasonal floodplain, and a permanent swamp, located along a hy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d175f01f4c22bf17ecbfc716584e01a5
https://doi.org/10.1175/2008mwr2582.1
https://doi.org/10.1175/2008mwr2582.1
Publikováno v:
Journal of the Atmospheric Sciences. 65:3247-3262
Debris clouds provide an important visual signature of tornadoes and can potentially significantly affect the wind structure, damage potential, and Doppler radar measurements of tornado wind speeds. To study such issues, the dynamics of finescale deb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a9fd59baeee03d271029b549fbbfeb2a
https://doi.org/10.1175/2008jas2686.1
https://doi.org/10.1175/2008jas2686.1
Autor:
W. S. Lewellen, David C. Lewellen
Publikováno v:
Journal of the Atmospheric Sciences. 64:2176-2194
An idealized analytical model and numerical large-eddy simulations are used to explore fluid-dynamic mechanisms by which tornadoes may be intensified near the surface relative to conditions aloft. The analytical model generalizes a simple model of Ba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::51decd42e686339ffe4b56bf4fdb6c13
https://doi.org/10.1175/jas3965.1
https://doi.org/10.1175/jas3965.1
Autor:
W. S. Lewellen, David C. Lewellen
Publikováno v:
Journal of the Atmospheric Sciences. 64:2195-2209
Results are presented from a large set of large-eddy simulations of a class of unsteady vortex evolution that may sometimes play a role in tornadogenesis or tornado variability. Beginning with a high-swirl parent vortex with an excess of low-swirl fl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5808be11fbca6de5cd8b7c6d88c3bf5
https://doi.org/10.1175/jas3966.1
https://doi.org/10.1175/jas3966.1