It is largely outdated, but since it’s your chosen formula, we shall apply it.

Unfortunately, as you supply neither the average mean annual temperature (T) of Ashcroft, nor Ashcroft’s R value, but only Ashcroft’s mean annual precipitation of 200mm, we are unable to work out Ashcroft’s Koppen AI. We only have your word that it is more arid than Eureka.

Nor do you if Ashcroft’s precipitation occurs in the colder months, the warmer months, or is evenly distributed.

However, for your application of the formula to yield a rating of Arid for Ashcroft, the annual average temperature would have to be below 6C, assuming precipitation occurs mainly in the warmer months. I have taken the liberty of using P/10 to represent annual precipitation in cm, since it actually measured in mm.

P/10 x 2 = 200/10 x 2 = 40

(40 – 28)/2 = 6

So let’s give Ashcroft the benefit of the doubt, and say it’s mean annual temperature is 5C.

However, your application of the formula for Eureka is skewed.

Using the formula you mention, 2 x T + 28, we get this: 2 x -15.5 = -31 + 28 = -3

I am pretty sure that -3 is less than twice 7.91 (P/10x 2), or 15.82.

That would mean Eureka is, by your application of the formula, well and truly classified as ‘arid’.

However, I am not sure from where you get twice 7.91 (P/10 x 2). That’s not in the formula.

The formula on the wikipedia link you give is this:

Arid regions are defined as those where annual rainfall accumulation (in centimetres) is less than R/2, where R = 2 x T + 28 if rainfall occurs mainly in the hot season.

Applying this formula likewise to an assumed annual temperature of 5C for Ashcroft (less than 6C, as was stated above), we get this:

2 x 5 = 10 + 28 = 38

Therefore R = 38, and R/2 = 19.

Annual rainfall in Ashcroft is definitely above 19cm (20cm, didn’t you say?), so would be not classed as ‘arid’ within Koppen’s Aridity Index. For Ashcroft to be classified as ‘arid’ using the formula applied properly, R would have to equal 37 or less. This would mean the average temperature would have to be 4.5C or lower. Perhaps it is. I am not debating whether Ashcroft is a desert or not. Simply that it is not Canada’s only desert.

Applying the above formula to Eureka, and not the strange one you inserted, gives us: R = -3, and R/2 = -6.

Of course, polar deserts don’t really have a ‘hot season’, do they? But the summers do average temperatures from 0-10C, so it is certainly warmer than the winter. In fact, they don’t really even have rainfall either, but do have precipitation.

It is worth noting even the language in that this formula is set up intuitively for non-polar regions, and is inapplicable to polar conditions.

As is obvious from the result, this formula cannot be applied to Eureka, because you cannot have annual rainfall that is a negative number.

The Aridity Index cannot be applied to polar climates because water is in an unavailable, frozen state, with temperatures averaging below -10C.

The result of applying this formula inappropriately to polar deserts requires negative precipitation, which is, of course, impossible.

That does not mean Polar Deserts cannot be classified as arid: it simply means their aridity cannot be measured using the same criteria as temperate climates.

“The Arctic and Antarctic contain polar deserts…Arid environments occur at the poles, along the equator, on mountains, plateaus, below sea level, along coasts, and within mid-continents. They may be hot or cold climate types.”

In Koppen’s system, the world is divided into 5 climate zones, and in only one of these zones (B), does the AI apply. The other 4 climate zones are defined by temperature alone, including the Polar zone (E).

One cannot pick and chose to apply formulas when they are neither applicable nor appropriate.

“Köppen’s classification is based on a subdivision of terrestrial climates into five major types, which are represented by the capital letters A, B, C, D, and E. Each of these climate types except for B is defined by temperature criteria. Type B designates climates in which the controlling factor on vegetation is dryness (rather than coldness). Type E climates (the coldest) are conventionally divided into tundra (ET) and snow/ice climates (EF).”

https://www.britannica.com/science/Koppen-climate-classification

And here, you can see that Koppen’s ‘E’ zones are not even mentioned in the below table, because the formula does not apply:

Table K1 Climatic regions classification

Full humid Semihumid Semiarid Arid

Af As/Aw

Cf Cs/Cw BS BW

Df Ds/Dw

This table also demonstrates that Polar regions are in a separate classification to temperate humid/arid classifications:

Table C3

Correspondence between climatic and vegetation types

Climate Vegetation type name Vegetation

Rainy tropical Malayan Evergreen rain forest

Subhumid tropical Nicaraguan Deciduous or monsoon forest

```
Timoran Savanna forest or woodland
Visayan Tropic grassland
```

Warm semiarid Tampicoan Thorn forest, thorn scrub

```
Tamaulipan Desert savanna, wetter parts
```

Warm arid Tamaulipan Desert savanna, drier parts

```
Sonoran Subtropic desert
Tripolian Short grass; desert grass
```

Hyperarid Atacaman “Barren” desert

Rainy subtropical Kyushun Warm temperate rain forest

```
Argentinean Prairie
```

Summer-dry subtropical Mediterranean Sclerophyll woodland and scrub

Rainy marine Tasman Subantarctic forest

Wet-winter temperate Oregonian Conifer forest

Rainy temperate. Virginian Mixed deciduous and conifer forest

Cool semiarid Patagonian Cold desert, wetter parts

Cool arid Patagonian Cold desert, drier parts

Subpolar Alaskan Taiga forest

Polar Aleutian Tundra and polar barrens

After Putnam et al. (1960).

]]>Given the fact that it gets a mere 79.1 mm per year (by far the driest spot in the Canadian Arctic), the temperature is very cold, even in summer, so there’s hardly any evaporation to speak of. I will look into the numbers later when I have time and report back.

]]>https://geology.com/records/largest-desert.shtml

The Largest Desert:

The two largest deserts on Earth are in the polar areas. The Antarctic Polar Desert covers the continent of Antarctica and has a size of about 5.5 million square miles. The second-largest desert is the Arctic Polar Desert. It extends over parts of Alaska, Canada, Greenland, Iceland, Norway, Sweden, Finland, and Russia. It has a surface area of about 5.4 million square miles. ]]>

Have some courtesy and tact next time it goes a long way not the bubble you seem to be living in. ]]>

For example, Osoyoos averages 1945 hours of sunshine per year while Victoria, which gets about twice the annual precipitation as Osoyoos is tried with Cranbrook as the sunniest place in the province with 2200 hours of sunshine annually.

]]>Because really, what scientific research is conducted in the Antarctic and Arctic?

And there’s no environmental devastation, or melting polar ice caps & species eradication, so who really does care?

Thanks for demonstrating that real way to prove one’s worth and to win a debate is through insults, not facts.

Viva Les Alternative Facts!

Live long and prosper:-) ]]>