OPAC - Artikel Jurnal & Majalah

Pengarang	:	R. G. Tobin
Nama Majalah/Jurnal	:	American Journal of Physics
Volume / Edisi	:	91 (No. 9)
Halaman	:	746-752
Abstrak	:	The ability to track flows of energy in complex and dissipative contexts is essential to understand many aspects of sustainable energy and climate change. Traditional physics instruction largely fails to develop that ability. This work argues that one plausible contributor to this deficiency could be an overemphasis on cases that lend themselves to quantitative calculation. Drawing on examples and data from a small sample of college physics students in a class on sustainable energy, it proposes that practice in semiquantitative energy tracking, using suitable visual and/or manipulable representations, can help develop students' skills in using energy reasoning in real-world, dissipative contexts.

Pengarang	:	-
Nama Majalah/Jurnal	:	American Journal of Physics
Volume / Edisi	:	91 (No. 9)
Halaman	:	731-745
Abstrak	:	Simple models for Earth's climate sensitivity (i.e. its temperature response to radiative forcing) are developed by combining the time-tested idealization of one-dimensional radiative-convective equilibrium (RCE) with simple yet quantitatively reasonable models for  forcing and the water vapor feedback. Along the way, we introduce key paradigms including the emission level approximation, the forcing-feedback decomposition of climate sensitivity, and “Simpson's law” for water vapor thermal emission. We also discuss climate feedbacks unaccounted for in this RCE framework, as well as differing variants of climate sensitivity, all of which may be ripe for their own chalkboard treatments.

Pengarang	:	Philip C. Nelson
Nama Majalah/Jurnal	:	American Journal of Physics
Volume / Edisi	:	91 (No. 9)
Halaman	:	721-730
Abstrak	:	I present a discussion of the effect of increasing carbon dioxide on planetary climate, at a level suitable for insertion as a module into an upper-level Physics course. The treatment includes two key ingredients that are often missing from more elementary discussions, yet are amenable to analytic methods: First, that convection implies a dependence of surface temperature on the height of the outermost infrared-thick layer; and second, that increasing the level of CO2 closes spectral windows of absorption. These themes are applicable not only to an industrializing Earth but also to our neighboring planets.

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