Zobrazeno 1 - 10
of 19
pro vyhledávání: '"R. W. Portmann"'
Autor:
Y. Zhu, R. W. Portmann, D. Kinnison, O. B. Toon, L. Millán, J. Zhang, H. Vömel, S. Tilmes, C. G. Bardeen, X. Wang, S. Evan, W. J. Randel, K. H. Rosenlof
Publikováno v:
Atmospheric Chemistry and Physics, Vol 23, Pp 13355-13367 (2023)
Near-term in-plume ozone depletion was observed for about 10 d by the Aura Microwave Limb Sounder (MLS) right after the January 2022 Hunga Tonga–Hunga Ha'apai (HTHH) eruption. This work analyzes the dynamic and chemical causes of this ozone depleti
Externí odkaz:
https://doaj.org/article/1e9b71a187a14417b1400564363f0534
Publikováno v:
Atmospheric Chemistry and Physics, Vol 23, Pp 3347-3361 (2023)
Several analyses of satellite-based ozone measurements have reported that lower-stratospheric ozone has declined since the late 1990s. In contrast to this, lower-stratospheric ozone was found to be increasing in specified-dynamics (SD) simulations fr
Externí odkaz:
https://doaj.org/article/e06f59d8a9d34467b1cca21ecb96f6b1
Autor:
L. Hu, S. A. Montzka, F. Moore, E. Hintsa, G. Dutton, M. C. Siso, K. Thoning, R. W. Portmann, K. McKain, C. Sweeney, I. Vimont, D. Nance, B. Hall, S. Wofsy
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 2891-2907 (2022)
The detection of increasing global CFC-11 emissions after 2012 alerted society to a possible violation of the Montreal Protocol on Substances that Deplete the Ozone Layer (MP). This alert resulted in parties to the MP taking urgent actions. As a resu
Externí odkaz:
https://doaj.org/article/6c9bc159fa9149db9d600defdbdf134a
Publikováno v:
Geoscientific Model Development, Vol 13, Pp 717-734 (2020)
Specified dynamics (SD) schemes relax the circulation in climate models toward a reference meteorology to simulate historical variability. These simulations are widely used to isolate the dynamical contributions to variability and trends in trace gas
Externí odkaz:
https://doaj.org/article/67978cb7decc48f89ed7aa108ec84a4a
Autor:
J. Mao, A. Carlton, R. C. Cohen, W. H. Brune, S. S. Brown, G. M. Wolfe, J. L. Jimenez, H. O. T. Pye, N. Lee Ng, L. Xu, V. F. McNeill, K. Tsigaridis, B. C. McDonald, C. Warneke, A. Guenther, M. J. Alvarado, J. de Gouw, L. J. Mickley, E. M. Leibensperger, R. Mathur, C. G. Nolte, R. W. Portmann, N. Unger, M. Tosca, L. W. Horowitz
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 2615-2651 (2018)
Concentrations of atmospheric trace species in the United States have changed dramatically over the past several decades in response to pollution control strategies, shifts in domestic energy policy and economics, and economic development (and res
Externí odkaz:
https://doaj.org/article/123642babe61495ebed33c682a0d99fe
Autor:
B. Hassler, P. J. Young, R. W. Portmann, G. E. Bodeker, J. S. Daniel, K. H. Rosenlof, S. Solomon
Publikováno v:
Atmospheric Chemistry and Physics, Vol 13, Iss 11, Pp 5533-5550 (2013)
Climate models that do not simulate changes in stratospheric ozone concentrations require the prescription of ozone fields to accurately calculate UV fluxes and stratospheric heating rates. In this study, three different global ozone time series that
Externí odkaz:
https://doaj.org/article/df2a765767d3476d87390d520f0c3720
Publikováno v:
Earth System Science Data, Vol 5, Iss 1, Pp 31-43 (2013)
High vertical resolution ozone measurements from eight different satellite-based instruments have been merged with data from the global ozonesonde network to calculate monthly mean ozone values in 5° latitude zones. These ''Tier 0'' ozone number den
Externí odkaz:
https://doaj.org/article/c3dea273186f40acba9f3f3914039616
Autor:
J. S. Daniel, E. L. Fleming, R. W. Portmann, G. J. M. Velders, C. H. Jackman, A. R. Ravishankara
Publikováno v:
Atmospheric Chemistry and Physics, Vol 10, Iss 16, Pp 7697-7707 (2010)
Hypothetical reductions in future emissions of ozone-depleting substances (ODSs) and N2O are evaluated in terms of effects on equivalent effective stratospheric chlorine (EESC), globally-averaged total column ozone, and radiative forcing through 2100
Externí odkaz:
https://doaj.org/article/6d3bd763f7ae4c07b639c4b4d5ed37c1
Autor:
A. O. Langford, R. Schofield, J. S. Daniel, R. W. Portmann, M. L. Melamed, H. L. Miller, E. G. Dutton, S. Solomon
Publikováno v:
Atmospheric Chemistry and Physics, Vol 7, Iss 3, Pp 575-586 (2007)
The "filling-in" (FI) of Fraunhofer lines, often referred to as the Ring effect, was examined using measurements of near ultraviolet sunlight scattered from the zenith sky above Boulder, Colorado during July and August 2005. The FI of the 344.1 nm Fe
Externí odkaz:
https://doaj.org/article/a5d56cdc7108479ba8298d38b4b3eae0
