USGS · 70213282
No abstract available.
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Francois E. Matthes. 2009-10-27. The new international commission of snow and glaciers. https://doi.org/10.1017/s0032247400064391
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Advanced Very High Resolution Radiometer (AVHRR) satellite data were acquired and composited into twice-a-month periods from 1 May 1991 to 15 October 1991 in order to map vegetation characteristics of the Alaskan landscape. Unique spatial and temporal qualities of the AVHRR data provide information that leads to a better understanding of regional biophysical characteristics of vegetation communities and patterns. These data provided synoptic views of the landscape and depicted phenological diversity, temporal vegetation phenology (green-up, peak of green, and senescence), photosynthetic activity, and regional landscape patterns. Products generated from the data included a phenological class map, phenological composite maps (onset, peak, and duration), and photosynthetic activity maps (mean and maximum greenness). The time-series data provide opportunities to study phenological processes at small landscape scales over time periods of weeks, months, and years. Regional patterns identified on some of the maps are unique to specific areas; others correspond to biophysical or ecoregional boundaries. The data provide new insights to landscape processes, ecology, and landscape physiognomy that allow scientists to look at landscapes in ways that were previously difficult to achieve.
In a recent study (Weeks and Campbell, in press), we made a rather complete examination of the idea that icebergs could advantageously be used as a source of fresh water. The origin of the general idea of transporting icebergs is obscure; it may date from the 1850's when ice was transported from Alaska to California as a commercial venture. The current revival of the idea, in particular as applied to the water problems of southern California, can be credited to John Issacs of the Scripps Institute of Oceanography (Burt, 1956). However no critical evaluation was ever published. We initially undertook the present study because our intuition “told” us that the idea was untenable and we thought that we could easily prove that this was the case, thereby laying the idea to rest. Our intuition proved to be wrong and we now believe that the idea is, indeed, highly attractive when applied to certain locations in the Southern Hemisphere. This note briefly outlines our approach to analyzing the problem and our results.
No abstract available.