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EA: PASQUILL_ATMOSPHERE_STABILITY_INDEX

Status:

STD 2005/06/07

Code:

945

Concept definition:

A method of categorizing the stability of an <ATMOSPHERE_REGION> of the <EARTH> in terms of the horizontal surface <<WIND_SPEED>>, the amount of solar radiation (insolation), and the <<TOTAL_CLOUD_COVERAGE>>; Pasquill atmosphere stability index.

Attribute value type:

ENUMERATION

Reference type:

Reference:

[GMET, "Pasquill stability classes"]

Supplemental references:

Enumerants (presented in a natural order)

1 / 1 Entries per page: 5 10 20 50 All Custom: 10 entries (displaying 1-10)

Status	Attribute label	Enumerant label ▾	Concept definition	Code	Ref type	Reference
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_A	Extremely unstable: daytime only, surface <<WIND_SPEED>> less than 2 metres per second with strong insolation; Category A.	1	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_A_B	Intermediate between moderate and extremely unstable: daytime only, <<WIND_SPEED>> less than 2 metres per second with moderate insolation, or <<WIND_SPEED>> 2 to 3 metres per second and strong insolation; Category A-B.	2	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_B	Moderately unstable: daytime only, <<WIND_SPEED>> less than 2 metres per second with slight insolation, or <<WIND_SPEED>> 2 to 3 metres per second with moderate insolation, or <<WIND_SPEED>> 3 to 4 metres per second with strong insolation; Category B.	3	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_B_C	Intermediate between slightly and moderate unstable: daytime only, <<WIND_SPEED>> 3 to 4 metres per second with moderate insolation; Category B-C.	4	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_C	Slightly unstable: daytime only, <<WIND_SPEED>> 2 to 4 metres per second with slight insolation, or <<WIND_SPEED>> greater than 4 metres per second with strong insolation; Category C.	5	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_C_D	Intermediate between neutral and slightly unstable: daytime only, <<WIND_SPEED>> 4 to 6 metres per second with moderate insolation; Category C-D.	6	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_D	Neutral conditions: during daytime, <<WIND_SPEED>> 4 to 6 metres per second with slight insolation, or <<WIND_SPEED>> greater than 6 metres per second with moderate or slight insolation; during <<WIND_SPEED>>, wind speed greater than 3 metres per second with thin overcast or more than 1/2 low cloud coverage, or <<WIND_SPEED>> greater than 4 metres per second with less than 3/8 cloud cover; anytime with heavy overcast; Category D.	7	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_E	Slightly stable: night-time only, <<WIND_SPEED>> 2 to 3 metres per second and thin overcast or more than 1/2 low cloud coverage, or <<WIND_SPEED>> 3 to 4 metres per second and less than 3/8 cloud cover; Category E.	8	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_F	Moderately stable, night-time only, <<WIND_SPEED>> 2 to 3 metres per second and less than 3/8 cloud cover; Category F.	9	IR	[APMD, Section 4.8.5]
STD 2005/06/07	PASQUILL_ATMOSPHERE- _STABILITY_INDEX	CATEGORY_G	Extremely stable; Category G.	10	IR	[APMD, Section 4.8.5]

1 / 1 Entries per page: 5 10 20 50 All Custom: 10 entries (displaying 1-10)

Group membership:

ATMOSPHERE

In addition to the status and date information for each entry, a colour coding scheme highlights the database holding to which an entry belongs. The following highlight colours are used:

white - the entry is in the standard
yellow - the entry has been added to the register
pink - the entry has been submitted for inclusion in the register, but it is not approved
cyan - a deprecated entry that was originally either in the standard or was added to the register, but has since been deprecated

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F n - has Figures and, if more than one figure, n figures
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C - has Clarifications

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