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Green icebergs: A problem in geophys...

Lee, Raymond L., Jr.

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Green icebergs: A problem in geophysics and atmospheric optics.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Green icebergs: A problem in geophysics and atmospheric optics./
作者:	Lee, Raymond L., Jr.
面頁冊數:	245 p.
附註:	Co-Advisers: Alistair B. Fraser; Craig F. Bohren.
Contained By:	Dissertation Abstracts International50-07B.
標題:	Geophysics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8922076

Green icebergs: A problem in geophysics and atmospheric optics.
Lee, Raymond L., Jr.

Green icebergs: A problem in geophysics and atmospheric optics. - 245 p.

Co-Advisers: Alistair B. Fraser; Craig F. Bohren.

Thesis (Ph.D.)--The Pennsylvania State University, 1989.

The curious phenomenon of green icebergs has intrigued polar travelers for centuries. Although some researchers have speculated that this ice contains colorants, an investigator who has actually examined a green iceberg sample found very little intrinsically green material. This supports our idea that at least some green icebergs are due to the combined effects of reddened sunlight illuminating intrinsically blue-green ice. In this case, "intrinsic" refers to the blue-green absorption minimum of pure ice. Naturally occurring ice containing a few inclusions that scatter light with little or no spectral selectivity also exhibits this same absorption minimum.Subjects--Topical Terms:

535228
Geophysics.

Green icebergs: A problem in geophysics and atmospheric optics.
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245 1 0 $a Green icebergs: A problem in geophysics and atmospheric optics.
300 $a 245 p.
500 $a Co-Advisers: Alistair B. Fraser; Craig F. Bohren.
500 $a Source: Dissertation Abstracts International, Volume: 50-07, Section: B, page: 2976.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 1989.
520 $a The curious phenomenon of green icebergs has intrigued polar travelers for centuries. Although some researchers have speculated that this ice contains colorants, an investigator who has actually examined a green iceberg sample found very little intrinsically green material. This supports our idea that at least some green icebergs are due to the combined effects of reddened sunlight illuminating intrinsically blue-green ice. In this case, "intrinsic" refers to the blue-green absorption minimum of pure ice. Naturally occurring ice containing a few inclusions that scatter light with little or no spectral selectivity also exhibits this same absorption minimum.
520 $a Artists' and travelers' accounts of colored ice tell us that, while remarkable, it is not uncommon. The few 20th-century scientific reports on green icebergs agree with the earlier accounts on the unusual denseness and translucence of highly colored ice. We see the same correlation between ice colors and ice denseness in accounts of glacier ice. When we examine the optical properties of dense, relatively bubble-free ice, we find that we can nearly match its reflectance spectra with either of two multiple-scattering models for ice optics. If we pair these models' reflectance spectra with estimates of polar daylight spectra, we can duplicate the observed colors of green icebergs.
520 $a Our psychophysical model of human color perception is the 1931 CIE chromaticity space. Although this form of colorimetry has some perceptual faults, we may nonetheless use it as a means of comparing the observed and theoretical colors of green icebergs. In the absence of in situ spectral reflectance measurements, we use video digitizing and spectrodensitometry to extract colorimetric information from color photographs of green icebergs. However, before using these remote sensing techniques, first we must solve the intricate problem of calibrating them against known color standards. After doing this, we find that our analyses of green iceberg photographs support the idea that some of these icebergs result from the combination of ice's intrinsic optical properties and its illumination by reddened sunlight.
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650 4 $a Physics, Atmospheric Science. $3 1019431
650 4 $a Psychology, Psychometrics. $3 1017742
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