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238
THE ATMOSPHERE AND METEOROLOGY.
the north-east re-assumes the supremacy, and traverses the whole of
Northern Africa obliquely to the south, toward the coasts of Southern
Guinea. Very violent at first, it soon becomes weaker, and hardly lasts
but two or three weeks, when it again gives place to the marine monsoon.
During its short prevalence the current coming from the desert does not
cease to bring with it a white dust having the appearance of a thick fog.
It is the sand of the Sahara, which in the regions situated immediately to
the north of Guinea is almost white, while farther the dust raised from
the ground by the Harmattan is nearly red.*
Pig. 107.—Trade-winds and Monsoons of the Atlantic.
On the coasts of Chili, on those of California, in the islands of the
Pacific, around the Gulf of Mexico and the sea of the Antilles, analogous
phenomena occur. In summer the valley of the Mississippi and the plateaux of Texas are traversed by real monsoons, which distribute^the rain
over that part of the continent, and then are in turn replaced by those
dangerous winds from the north or ttorth-east (nortes), which are themselves trade-winds, more or less turned aside from their route. On their
side, the western shores of Mexico present a similar alternation of winds,
those from the south-west coming in summer, and those from the northeast in winter. On coasts parallel or merely oblique to the path of the
trade-winds, a part of these winds is not brought back, as in the West
Indies or at Guinea, but it is more or less attracted by the centre of heat,
which lies out of its regular course. It is thus that on the coast of Mo-
* Borghero, Bulletin de la Society Geographic, July, 1866.
| Title | The ocean, atmosphere, and life |
| Creator | Reclus, Elisée |
| Publisher | Harper |
| Place of Publication | New York |
| Date | 1873 |
| Language | eng |
| Type | Books/Pamphlets |
| Title | 00000263 |
| Type | Books/Pamphlets |
| Transcript | 238 THE ATMOSPHERE AND METEOROLOGY. the north-east re-assumes the supremacy, and traverses the whole of Northern Africa obliquely to the south, toward the coasts of Southern Guinea. Very violent at first, it soon becomes weaker, and hardly lasts but two or three weeks, when it again gives place to the marine monsoon. During its short prevalence the current coming from the desert does not cease to bring with it a white dust having the appearance of a thick fog. It is the sand of the Sahara, which in the regions situated immediately to the north of Guinea is almost white, while farther the dust raised from the ground by the Harmattan is nearly red.* Pig. 107.—Trade-winds and Monsoons of the Atlantic. On the coasts of Chili, on those of California, in the islands of the Pacific, around the Gulf of Mexico and the sea of the Antilles, analogous phenomena occur. In summer the valley of the Mississippi and the plateaux of Texas are traversed by real monsoons, which distribute^the rain over that part of the continent, and then are in turn replaced by those dangerous winds from the north or ttorth-east (nortes), which are themselves trade-winds, more or less turned aside from their route. On their side, the western shores of Mexico present a similar alternation of winds, those from the south-west coming in summer, and those from the northeast in winter. On coasts parallel or merely oblique to the path of the trade-winds, a part of these winds is not brought back, as in the West Indies or at Guinea, but it is more or less attracted by the centre of heat, which lies out of its regular course. It is thus that on the coast of Mo- * Borghero, Bulletin de la Society Geographic, July, 1866. |
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