A loess is a periglacial or aeolian (windborne) sediment, defined as an accumulation of 20% or less of clay with a balance of roughly equal parts sand and silt (with a typical grain size from 20 to 50 micrometers), [3][4] often loosely cemented by calcium carbonate.

LOESS curve fitted to a population sampled from a sine wave with uniform noise added. The LOESS curve approximates the original sine wave. Local regression or local polynomial regression, [1] also known as moving regression, [2] is a generalization of the moving average and polynomial regression. [3] .

2022年12月5日 · Loess are silt-sized particles deposited on the Earth's surface by winds. Extensive loess deposits formed during the Ice Ages in areas bordering large, continental glaciers. Paleosols are past soil horizons preserved in a geologic section, indicative of changes in variables such as temperature and precipitation.

Loess is a sedimentary deposit composed largely of silt-size grains that are loosely cemented by calcium carbonate. It is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs.

2020年2月1日 · Loess is a loose aeolian deposit of yellowish silt-sized dust mostly formed during the Quaternary period. Generally, it has a homogenous and porous structure and consists primarily of quartz and felspar particles. Ancient Chinese scholars linked the formation of loess to wind-blown dust 2000 years ago.

Dust storms derived from such rock units are frequent even today in the continental deserts of Asia; the silt content of “continental loesses” is derived in this manner. Another significant source of dust may have been the marginal zone of the Pleistocene ice …

In North America loess covers the plains of the Platte, Missouri, Mississippi, and Ohio rivers and the Columbia Plateau. In the Southern Hemisphere, between latitudes 30° and 40° S, the most significant loess regions include the “pampas loesses” …

The meaning of LOESS is an unstratified usually buff to yellowish brown loamy deposit found in North America, Europe, and Asia and believed to be chiefly deposited by the wind.

Loess can be defined simply as a terrestrial clastic sediment, composed predominantly of silt-sized particles, which is formed essentially by the accumulation of wind-blown dust.

LOESS definition: 1. a type of light brown or greyish soil, consisting of very small pieces of quartz and clay, that…. Learn more.