Readme for East Asian Monsoon Toolkit

Project contains code for a range of indices/metrics for monsoon intensity, onset, withdrawal and duration. Code requires numpy and xarray

Code is organised by region/monsoon feature:

easm: East Asian Summer Monsoon

• wang_fan_1999.py: Intensity index from https://doi.org/10.1175/1520-0477(1999)080%3C0629:COSASM%3E2.0.CO;2

scsm: South China Sea Monsoon

• wang_etal_2004.py: Onset index described in https://doi.org/10.1175/2932.1
• gao_etal_2001.py: Onset index described in https://doi.org/10.1007/s00376-018-8100-z

meiyu: Meiyu-Baiu rainband

• li_etal_2018.py: Front identification as described in https://doi.org/10.1007/s00382-017-3975-4

general: Indices broadly applicable across Asia/globe

• wang_linho_2002.py: Identify pentads of monsoon onset, withdrawal and peak based on value relative to Jan climatological mean https://doi.org/10.1175/1520-0442(2002)015%3C0386:RSOTAP%3E2.0.CO;2
• kitoh_uchiyama_2006.py: Identify pentads of monsoon onset, withdrawal and peak based on Normalised Pentad Precipitation Index https://doi.org/10.2151/jmsj.84.247
• li_zhang_2009.py: Identify pentads of monsoon onset and withdrawal based on wind rotation criteria https://doi.org/10.1007/s00382-008-0465-8
• yim_etal_2014_vorticity.py: Evaluate vorticity/wind metrics as a proxy for intensity of various regional monsoons https://doi.org/10.1007/s00382-013-1956-9
• yim_etal_2014_precip.py: Calculate regional monsoon precipitation intensities as per https://doi.org/10.1007/s00382-013-1956-9

Work in progress:

• Clean up code further, aim to make input data format needed consistent
• Add further tools as useful, e.g. list in https://doi.org/10.1175/2008JCLI2183.1
• Expand to South Asian and other regional monsoons