Home (English) Home (Chinese)
North American Summer Monsoon Index (NASMI)
The North American summer monsoon index (NASMI) is defined as an area-averaged seasonally (JAS) dynamical normalized seasonality (DNS) at 700 hPa within the North American monsoon domain (17.5°-35°N, 100°-120°W) (Li and Zeng, 2002, 2003, 2005).
The North American Summer Monsoon Index (NASMI)
The normalized time series of NASMI (1948-2010).
The summer here is JAS. The thick solid lines indicate 9-year Gaussian-type filtered values.
Correlation between precipitation and the NASMI (shading) and regression of 850-mb winds against the monsoon index (vectors) for July, August and September 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
|
The Monthly North American Summer Monsoon Index (NASMI) Data |
||
|
Filename |
Size |
Description |
|
4 kilobytes |
North American Summer Monsoon Index (NASMI) |
|
|
You can download this file from here (right-click then select "Save Target As" or "Save Link As"). |
||
|
File format |
|
for year = 1948 to 2010 format (1x, i4, 8f7.3) year, Jul, Aug, Sep, and summer (JAS) raw values, Jul, Aug, Sep, and summer (JAS) normalized values |
|
Note: Missing values represented by 99.99. |
|
The Daily North American Summer Monsoon Index (NASMI) Data will soon be available |
Last updated: 2010-10-12 (Jianping Li: ljp@lasg.iap.ac.cn)