Read e-book online 3D Radiative Transfer in Cloudy Atmospheres (Physics of PDF

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By Alexander Marshak, Anthony Davis

ISBN-10: 3540239588

ISBN-13: 9783540239581

Advancements in third-dimensional cloud radiation over the last few a long time are assessed and distilled into this contributed quantity. Chapters are authored via subject-matter specialists who address a large viewers of graduate scholars, researchers, and a person drawn to cloud-radiation strategies within the sun and infrared spectral regions. After introductory chapters and a piece at the basic physics and computational thoughts, the quantity largely treats major program components: the influence of clouds at the Earth's radiation funds, that's a vital point of weather modeling; and distant statement of clouds, in particular with the complicated sensors on present and destiny satellite tv for pc missions.

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Extra resources for 3D Radiative Transfer in Cloudy Atmospheres (Physics of Earth and Space Environments)

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Monte Carlo methods really excel when the interest is mainly in the radiance escaping from the structure being sprayed with photons, or when only grand spatial and/or angular averages are needed. If one is interested in internal radiances, or in escaping radiances from every voxel at every angle, Monte Carlo will generally be too inaccurate for any reasonable number of initial photons. For example, you can launch 10M photons, but what if only 10 photons escape from a particular voxel in a particular direction?

It began with the earliest application I made of ATRAD outside the ARPA Program – to Arctic stratus clouds. I compared the output of ATRAD to a few radiative flux measurements by Gunter Weller in Wiscombe (1975), now somewhat a classic in the polar community. One review of that paper stung me to the core, though, and shaped my future in 3D clouds in ways I could never have envisioned at the time. It simply remarked that ATRAD seemed an excessive load of machinery to throw at a few pathetic broadband flux measurements.

A 4D sphere passing through our 3D world would appear like a ghost, growing from a point to full size and then shrinking and finally vanishing. No one would regard this as a trivial extension of a 3D sphere! We can paper over this difficulty by assuming that higher dimensions are just a mathematical cross-product of single dimensions, but such an assumption, tantamount to a miracle, should not be accepted at face value without extensive proof. We were in better shape on the theoretical than on the observational front, due to the extensive work on 3D radiative transfer in the Manhattan Project and after World War II, motivated by nuclear weapon and nuclear reactor problems.

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3D Radiative Transfer in Cloudy Atmospheres (Physics of Earth and Space Environments) by Alexander Marshak, Anthony Davis


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