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South American Summer Monsoon Index (SAMSMI)
The South American summer monsoon index (SAMSMI) is defined as an area-averaged seasonally (DJFM) dynamical normalized seasonality (DNS) at 925 hPa within the South American monsoon domain (17.5°-10°S, 50°-62.5°W) (Li and Zeng, 2002, 2003, 2005).
The South American Summer Monsoon Index (SAMSMI)
The normalized time series of SAMSMI (1948-2010).
The summer here is DJFM. The thick solid lines indicate 9-year Gaussian-type filtered values.
Correlation between precipitation and the SAMSMI (shading) and regression of 850-mb winds against the monsoon index (vectors) for December, January, February and March from 1979 to 2006, respectively. The shaded areas and vectors indicate significant at the 95% confidence level.
Related
References
Li, J. and Q. Zeng, 2005: A new monsoon index, its interannual variability and relation with monsoon precipitation. Climatic and Environmental Research, 10(3): 351-365. Electronic version PDF
Li, J. and Q. Zeng, 2003: A new monsoon index and the geographical distribution of the global monsoons, Adv. Atmos. Sci., 20, 299-302. Electronic version PDF
Li, J. and Q. Zeng, 2002: A unified monsoon index, Geophysical Research Letters, 29(8), 1274, doi:10.1029/2001GL013874. Electronic version PDF
Li, J., and Q. Zeng, 2000: Significance of the normalized seasonality of wind field and its rationality for characterizing the monsoon, Science in China (D), 43(6): 647-653. Electronic version PDF
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The Monthly South American Summer Monsoon Index (SAMSMI) Data |
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4 kilobytes |
South American Summer Monsoon Index (SAMSMI) |
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You can download this file from here (right-click then select "Save Target As" or "Save Link As"). |
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File format |
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for year = 1948 to 2010 format (1x, i4, 10f7.3) year, Dec, Jan, Feb, Mar and summer (DJFM) raw values, Dec, Jan, Feb, Mar and summer (DJFM) normalized values |
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Note: Missing values represented by 99.99. |
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The Daily South American Summer Monsoon Index (SAMSMI) Data will soon be available |
Last updated: 2010-10-12 (Jianping Li: ljp@lasg.iap.ac.cn)