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of 155
pro vyhledávání: '"van Wijngaarden, W."'
Using feedback-free estimates of the warming by increased atmospheric carbon dioxide (CO2) and observed rates of increase, we estimate that if the United States (U.S.) eliminated net CO2 emissions by the year 2050, this would avert a warming of 0.008
Externí odkaz:
http://arxiv.org/abs/2406.07392
Autor:
van Wijngaarden, W. A., Happer, W.
Greenhouse gases, most importantly water vapor, increase the emissivity and decrease the albedo of clouds for thermal radiation. The modifications, which can be of order 10% for optically thick clouds, depend on the attenuation coefficient $\alpha^{\
Externí odkaz:
http://arxiv.org/abs/2401.03061
Autor:
van Wijngaarden, W. A., Happer, W.
For 2n-stream radiation transfer theory, a stack of m clouds can be represented as an equivalent cloud. Individual clouds, indexed by c = 1, 2, 3, ..., m are characterized by 2n x 2n scattering matrices S^{c}, that describe how the cloud interacts wi
Externí odkaz:
http://arxiv.org/abs/2310.10622
Autor:
van Wijngaarden, W. A., Happer, W.
The clear sky instantaneous radiative forcings of the 14 halogenated gases previously shown to have the largest contribution to global warming, were found. The calculation used the absorption cross sections for the halogenated gases which are assumed
Externí odkaz:
http://arxiv.org/abs/2306.13642
Autor:
van Wijngaarden, W. A.
The effect of changing greenhouse gas concentrations on climate was examined. Calculations of the climate sensitivity, the warming of the Earth due to a doubling of atmospheric CO2, are discussed. Ontario was responsible for 0.35% of the world's CO2
Externí odkaz:
http://arxiv.org/abs/2305.05500
Autor:
van Wijngaarden, W. A., Happer, W.
We discuss how greenhouse gases affect radiation transfer in Earth's atmosphere. We explain how greenhouse gases like water vapor or carbon dioxide, differ from non-greenhouse gases like nitrogen or oxygen. Using simple thermodynamics and fluid mecha
Externí odkaz:
http://arxiv.org/abs/2303.00808
Autor:
van Wijngaarden, W. A., Happer, W.
We analyze thermal emission of radiation in homogeneous clouds. The clouds have negligible horizontal variation, but the temperature can vary vertically. The radiation at optical depth $\tau$ above the cloud bottom is characterized by intensity value
Externí odkaz:
http://arxiv.org/abs/2301.08129
Higher concentrations of atmospheric nitrous oxide (N2O) are expected to slightly warm Earth's surface because of increases in radiative forcing. Radiative forcing is the difference in the net upward thermal radiation flux from the Earth through a tr
Externí odkaz:
http://arxiv.org/abs/2211.15780
Autor:
van Wijngaarden, W. A., Happer, W.
We show how to use matrix methods of quantum mechanics to efficiently and accurately calculate axially symmetric radiation transfer in clouds, with conservative scattering of arbitrary anisotropy. Analyses of conservative scattering, where the single
Externí odkaz:
http://arxiv.org/abs/2207.03978
Autor:
van Wijngaarden, W. A., Happer, W.
We use 2n streams, where n is an integer, of axially symmetric radiation to solve the equation of transfer for a layered medium. This is a generalization of Schuster's classic 2 stream model. As is well known, using only the first 2n Legendre polynom
Externí odkaz:
http://arxiv.org/abs/2205.09713