Re: [Precolumbian_Inscriptions] desertification
- Something I havn't seen mentioned is the over-irrigation of many of these areas. When you irrigate an area such as was the case around the city of Babylon what happens is a high evaporation rate and this leaves a high salt content. The area is then a saline sterile area. And if U. S. farmers aren't careful this will happen in california and Florida. rwscruffy
mike <sparky@...> wrote:several ancient sages, noted for their knowledge of geography, had stated that the equator belt, and several degrees either side of it, were less hot than the areas beyond it. they were thought foolish by their contemporaries, and by myself - until i read of the aridity of the counter-convergence air currents being pumped into the area between the 20th and 30th degree of lattitude.this knowledge explains so much, and i hope the experts grasp it and rewrite their text books. their current theories of excess tree cutting and over-grazing to explain the desertification are ridiculous. it would mean the rains and clouds were the same as before, which is far from true. the result would be erosion and sand storms - but it does not explain the dry air and lack of clouds and rains in these lattitudes.the great pyramid is on 30 degree north lattitude, and one might expect the area north of it across north africa to be less affected by this phenomena. this may explain why libya and egypt continued to supply grain in excess quantities thru roman times. not that we should expect that the scientist did more than estimate the general boundaries of the aridity pattern.they speak of the advance of the desert - but in what direction? does the desert begin in the middle of the region, say 25 degree parallel then advance in both directions, or begin closer to the 20th parallel and march outward from the equator? i suppose scientists would have to make relative humidity measurements in a line, north and south, to determine this.david, are you listening?----- Original Message -----From: mikeSent: 2004��6��30�� 20:34Subject: [Precolumbian_Inscriptions] desertification
" The compensating air flow for the trade wind is a kind of anti-trade wind in the uppermost troposphere, located above the trades, where the flow of air is going east and away from the convergence. The compensating flow for the rise of the air in the convergence is the downward motion of air in the desert zone, centered between 20 and 30� latitude. This falling air heats up as the pressure increases and is therefore greatly under-saturated with water vapor. This produces clear skies, evaporation at the sea surface (or soil) and general aridity. (To verify this check the positions of the major deserts on a map.) Surface air from subtropical regions returns towards the equator (as the Trade Winds) to replace the rising air, so completing the cycle of air circulation within the Hadley cell. "ive read many studies of the reasons for the spread of deserts, and most list other causes, mostly blaming man, such as the cutting of trees and overgrazing. i believe the above factors are more responsible. its too big a coincidence that these regions of desert lie between 20 and 30 degrees of lattitude.this is very important to our studies, and had impact upon the fertile crescent of mesopotamia, egypt, libya, the atacama, even our american southwest. it caused major migrations, and was the stimulus for voyages of exploration, in advance of colonies.this desertification happened during historical times, and affected high civilizations that had been very fertile areas as recently as 2000 years ago in some cases. there should be records to study that will inform us of the extent of desert at various times. iraq, egypt, and libya had been the breadbaskets for the old world - and now can barely grow enough to feed themselves.for these reasons, im inclined to think there must have been a poleshift more recently than 10,000 bce. the rate of desertification of the sahara is 1km per year during the last 500 years. it points to an axis shift somewhere about the years of 3100 and 2100 bce.
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- the persians irrigated so extensively that the euphrates dried up before reaching the sea.if it were not for the gulfstream the climate of florida would be very different.if man would block the passage that allows the labrador currents to penetrate new england, the gulfstream would enter and give the area a wonderful climate, much warmer winters than they now suffer.----- Original Message -----From: robert walshSent: 2004Äê6ÔÂ30ÈÕ 20:57Subject: Re: [Precolumbian_Inscriptions] desertificationSomething I havn't seen mentioned is the over-irrigation of many of these areas. When you irrigate an area such as was the case around the city of Babylon what happens is a high evaporation rate and this leaves a high salt content. The area is then a saline sterile area. And if U. S. farmers aren't careful this will happen in california and Florida. rwscruffy
- this has been brought up before, but its importance deserves further attention.when the polar axis shifts, the equator relocates. the regions 15 degrees, north and south of the equator get tropical rains. the regions 15 to 35 degrees north and south of the new equator are made arid by the trade winds.the last poleshift circa 3107 bce, caused north africa and australia to become deserts.above the equator, the trade winds come out of the northeast, drying out the ground. in the southern hemisphere, they come out of the southeast. this adds moisture to the southeast coast of australia, while drying out the rest of it.even a minor poleshift, could cause a dramatic climate change in these places.if the andes had not uplifted further, the west coast of peru would be jungle down to 15 degrees south lattitude. as far as nazca would be jungle had the andes not uplifted further. there are proofs that it was jungle during the time of cultured man, so this points to a recent uplift of the andes. its almost certain that some ranges uplifted circa 10,000 bce, perhaps that included tiwanaku, and its toxodons, and portions of columbia, where the mammoth died of exposure at 2 miles elevation.mike