Comments on: WRSHP the desert

By: WILL CAMPBELL

WILL CAMPBELL — Wed, 05 Aug 2009 00:15:49 +0000

Calling Southern California a desert is destined to become as rebuttal-inducing as calling Silver Lake the “eastside.” And rightly so.

As for those who classify our mountains as “reasonable” because they don’t aspire to five-digit elevations, I’d invite ascents of either the 10,064′ rock named Mt. San Antonio (Mt. Baldy) in the San Gabriels or the 11,490′ San Gorgonio in the San Bernardino range.

By: Lulu of the Lotus-Eaters

Lulu of the Lotus-Eaters — Tue, 04 Aug 2009 23:07:03 +0000

Really my post was just a few snapshots of a pretty walk. I am glad the bimodal precipitation comment encouraged some comments though. My kudos to lamapnerd as well. I think my brief not also tried to observe something else as well though: along with the bimodal distribution of precipitation, we tend to have more microclimatic variation over a small geographic range than do many other steppes. Turning on the local weather channel shows that just a few miles makes for a pretty huge variation in temperature, rainfall… and consequently, of course, localized vegetation. Again, LA is not unique, but it is more-so than most places.

By: frazgo

frazgo — Tue, 04 Aug 2009 22:58:11 +0000

LA Mapnerd is my hero too.

By: Lucinda Michele

Lucinda Michele — Tue, 04 Aug 2009 20:53:37 +0000

LA Mapnerd, I love you.

By: lamapnerd

lamapnerd — Tue, 04 Aug 2009 20:26:15 +0000

By most classification systems (particularly the Modified Köppen classification system generally used by climatologists), the climate in the dry phase of our wet/dry cycle would be regarded as a steppe (Köppen class BSh) rather than a desert (Köppen class BWh) – average precipitation less than the total potential evapotranspiration, but more than half the total. (Deserts have average annual precip less than half the total.)

That classification would be consistent with the persistence of extensive native grasslands – typical of a steppe climate, but not a desert – even in the driest years.

(Before it was farmed, the San Fernando Valley was thickly covered with wild oats; and in the late 19th century, before the LA aqueduct was built, it was cultivated as one of the nation’s largest wheat farms without supplemental irrigation.)

But trying to classify the climate as “a desert in the driest years” (or even a steppe) sort of misses the point, since climate classification is based on long-term averages, not short-term variations.

LA’s climate type is “Mediterranean” (Köppen class CSa). Many areas with type CSa Mediterranean climates have strongly bimodal precipitation – it’s a common component of the overall pattern.

By: Lucinda Michele

Lucinda Michele — Tue, 04 Aug 2009 17:46:28 +0000

No, our mountains are “reasonable.” Take it from someone who got in over her head at 10,000 feet in the western Sierras, east of the Central Valley, a few weeks back: THOSE are unreasonable mountains. Our Santa Monicas & San Gabriels, not so much.

By: theparsley

theparsley — Tue, 04 Aug 2009 15:18:10 +0000

“reasonable” mountains?

the implacable granite of the San Gabriels awaits you. not the Rockies, but they can do some damage (see John McPhee, “Los Angeles Versus the Mountains”)

southern california nature: beautiful, to be sure, but not so benign. or reasonable. no reason it should be, really.