VOLCANO MADNESS: Re: [Geology2] The Haboobs of Arizona -the How's and Why's

Thursday, October 13, 2011

Re: [Geology2] The Haboobs of Arizona -the How's and Why's

Language often defines the real desert folk. Bre knows, as she's been there and done that, re: the haboob. So have I, but at a later age. For example, caliche is the word I use for desert pavement; just try putting a shovel in it. Ha! Bajada is a word I use for an alluvial fan at the base of a mountain or range. I've seen some really gorgeous ones, too.

More common terminology contributed to the Spanish in geology are butte, canyon, playa, and mesa. Don't have to define those for you. Also, caldera, from the Sp. word for caldron. Arroyo is a word you either recognize right away for just don't know; but I use the term for desert stream beds whether they are wet or dry.

A coquina is a type of sedimentary rock that forms a concretion and is common in fossil sites in the lower states of the SE US. A Savanna(h) is common all over the US, but it, too, is Spanish based.

That's all I can remember for the moment. At least I didn't spend 4 years in Spanish class for nothing. lol Learning loanwords from other languages is really fun and of course, the Icelandic folks contributed their lot to geology, too. Next time, kiddies. :-)

Lin

On Thu, Oct 13, 2011 at 9:29 PM, <LadyTozi@aol.com> wrote:

No he's not. The land between Phoenix and Tucson is flat and barren, at least to uneducated eye. The wind that whips through there can get very strong and intense. When I was a kid, we used to have them so strong that the wind would tear up patio furniture and toss light items into the next yard. We called them haboob after the Arabic word. We also had a monsoon season where there is a lot of moisture in the air. It's nothing like what happens in India and other places.

Bre

In a message dated 10/13/2011 10:46:59 A.M. Central Daylight Time, allison.m.loukanis@att.net writes:

Ok this must be another obscure reference to some climate phenomenon or desert condition... because I read the article very carefully and there was no word such as haboobs. S I looked it up and I found that Wikipedia, ( and this is for the laypeople on this list) defines haboobs which is an Arabic word thusly: "A haboob (Arabic:"هَبوب", "strong wind") is a type of intense duststorm commonly observed in arid regions throughout the world."

Kim is having his little joke.

From: Kim Noyes <kimnoyes@gmail.com>
To: geology2@yahoogroups.com
Sent: Thursday, October 13, 2011 10:24 AM
Subject: Re: [Geology2] The Haboobs of Arizona -the How's and Why's

I love haboobs. ;-p

On Thu, Oct 13, 2011 at 6:07 AM, Lin Kerns <linkerns@gmail.com> wrote:

Dust Storms Roll Across Arizona

USGS Science Explains the Phenomenon
Posted on October 6, 2011 By Seth M. Munson, Jayne Belnap, and Richard L. Reynolds

A car approaches a dust storm near Winslow, Arizona, in April 2011. In drought years, low vegetation cover and disturbance to soil surfaces leads to more dust storms.

A dust storm that rolled across the Arizona desert on Tuesday, October 4, 2011, effectively blinded motorists, leading to a large string of motor vehicle crashes, multiple injuries, and at least one death.

Both this storm and another storm that passed through Phoenix on July 5, 2011, carried large quantities of airborne particulates and caused considerable property damage and potential harm to human health.

But what is causing these storms?

USGS and partner science show that there are many causes of dust storms. Two contributing factors are low vegetation cover and disturbance to soil surfaces.

Vegetation contributes to ecological integrity. The presence of plants reduces soil erosion and dust storms, because it keeps the soil intact, reduces wind momentum, and traps moving soil particles (See Figure 1). In spaces between the plants, many undisturbed desert soils are naturally armored by hardened physical and biological crusts.

Low vegetation cover can especially be a problem in drought years in abandoned agricultural fields, which are generally dominated by annual plants. This means that the consequences of dust storms, including motor vehicle crashes, are high in a drought year and low in years with more precipitation (See Figure 2).

Similarly, in places where land-use activities destroy or reduce soil crusts and weaken soil stability, experts know to assume higher dust storm activity than in places where soils are left undisturbed.

Future climate scenarios predict that drought conditions will worsen, and therefore more dust storms are likely.

Nevertheless, site restoration and reduced disturbance can mitigate some of the factors that promote dust emission.The USGS and land managers are working together to better understand the causes and sources of dust storm activity in the southwestern United States.

Figure 1: The presence of plants reduces soil erosion and dust storms because it keeps the soil intact, reduces wind momentum, and traps moving soil particles. Intact soil surfaces, which may include soil crusts, can also reduce the risk of dust storms.

Figure 2: The number of motor vehicle crashes caused by dust storms in Arizona has generally been lower when the annual precipitation has been higher. In a changing climate, climate scenarios predict more drought, which will likely mean more dust storms. But site restoration and reduced disturbance can mitigate some factors that promote dust emission

source

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