English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The first airborne radio-echo sounding of a temperate glacier was performed in 1978 at Columbia Glacier, a large (1,100-squarekilometer), grounded, iceberg-calving glacier 38 kilometers west of Valdez, Alaska. The sounding system used a low frequency (about 1.5 megahertz) to overcome scatterings from water-filled voids in the ice, a short pulse, and an untuned receiver. Transverse and longitudinal profiles were flown over the lower 7 kilometers of the glacier. The received signal, the horizontal position of the airplane, and its altitude above the glacier surface were recorded by an FM tape recorder. For the data analysis, pictures of received energy from each flight profile were reconstructed from the taped data using an oscilloscope. Use of intersecting profiles allowed an internal consistency check to determine whether the correct bed reflection had been chosen. A three-dimensional geometric method of determining the envelope of the reflection lobes was developed for interpreting the data, instead of the differential method used by previous investigators. This analysis provided bedrock altitude determinations at every node of a 200-meter square grid. The probable error in the inferred bed altitudes was estimated to be 30 meters; the greatest depth was 370 meters below sea level.

Bed topography inferred from airborne radio-echo sounding of Columbia Glacier, Alaska