easyclimate.field.air_sea_interaction.index_amm

Atlantic Meridional Mode (AMM) Index

Functions

calc_index_AMM_Doi_2009(, lon_dim, lat_dim, time_dim, ...)

The calculation of monthly mean Atlantic Meridional Mode (AMM) index is constructed by following method:

Module Contents

easyclimate.field.air_sea_interaction.index_amm.calc_index_AMM_Doi_2009(sst_monthly_data: xarray.DataArray, time_range: slice = slice(None, None), lon_dim: str = 'lon', lat_dim: str = 'lat', time_dim: str = 'time', normalized: bool = False) → xarray.DataArray

The calculation of monthly mean Atlantic Meridional Mode (AMM) index is constructed by following method:

The difference difference between the northern index (SSTA in 5–15°N, 50–20°W) and the southern index (SSTA in 5–15°S, 20°W–10°E). See Fig. 7 in Doi et al. 2009.

Parameters

sst_monthly_data: xarray.DataArray.

The monthly sea surface temperature (SST) dataset.

time_range: slice, default: slice(None, None).

The time range of seasonal cycle means to be calculated. The default value is the entire time range.

lon_dim: str, default: lon.

Longitude coordinate dimension name. By default extracting is applied over the lon dimension.

lat_dim: str, default: lat.

Latitude coordinate dimension name. By default extracting is applied over the lat dimension.

time_dim: str, default: time.

The time coordinate dimension name.

normalized: bool, default True, optional.

Whether to standardize the index based on standard deviation over time_range.

Returns

The monthly mean AMM index (xarray.DataArray).

Reference