lambWT: Calculation of Lamb Weather types (WT).

In SantanderMetGroup/climate4R.indices: Climate Index calculation for climate4R data

Calculation of Lamb Weather types (WT).

Description

Calculate automated Lamb WT as defined in Trigo daCamara 2000 and Jones et al. 2012, both Int J Climatol

Usage

lambWT(grid, center.point = c(-5, 55), base = NULL, ref = NULL)

Arguments

grid	A grid (gridded or station dataset), or multimember grid object of MSLP values.
center.point	A two value vector that must include lon and lat from a location that will work as center point for the Lamb WT. See details.
base	Baseline grid to be substracted for the calculation of anomalies. Default: NULL. See ?scaleGrid.
ref	Reference grid to be added for the calculation of anomalies. Default: NULL. See ?scaleGrid.

Details

According to Jones et al. 2012 (Int J Climatol), Lamb WT is only applied on North Atlantic domain. The input grid units must be Pa, not hPa/mbar. If it is not in Pa, the units will be converted automatically. A center location point must be specified by the user. Then, the function calculates from left to right and from first to 16st the rest of the location point from the grid specified by Jones et al. 2012:

						01			02
			03			04			05			06
			07			08			09			10
			11			12			13			14
						15			16

where the north-south distance is 5º and the west-east distance is 10º.

Value

The Lamb WT circulation index (and members, if applicable) with:

• index: vector with the corresponding weather type from each point of the series, that is defined as follows:

  purely anticyclonic = 1

  directional anticyclonic from NE to N = 2 to 9

  purely directional from NE to N = 10 to 17

  purely cyclonic = 18

  directional cyclonic from NE to N = 19 to 26

  light indeterminate flow N = 27 .

• pattern: Array with the spatial pattern of the 27 weather types obtained.

• dates and coordinates.

• further arguments related to the Lamb WT index.

Examples

## Not run: 
data(NCEP_slp_2001_2010)
lamb.wt <- lambWT(grid = NCEP_slp_2001_2010)

## End(Not run)

SantanderMetGroup/climate4R.indices documentation built on July 3, 2023, 11:02 p.m.