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Figure 1. Typical anomalies of SST and lower-tropospheric circulation associated with pure positive IOD events in the mature stage. H and L denote anti-cyclonic and cyclonic circulation anomalies, respectively. |
Table 1. Historical IOD events observed since 1949
|
Positive IOD | Negative IOD |
---|---|
summer 1949 - autumn 1949 | summer 1952 - autumn 1952 |
summer 1954 - autumn 1954 | |
summer 1956 | |
summer 1958 - autumn 1958 | |
summer 1961 - autumn 1961 | |
summer 1963 - autumn 1963 | |
summer 1967 - autumn 1967 | |
summer 1972 - autumn 1972 | autumn 1975 |
summer 1981 - autumn 1981 | |
summer 1982 - autumn 1982 | summer 1984 - autumn 1984 |
summer 1985 | |
summer 1989 - autumn 1989 | |
summer 1994 - autumn 1994 | summer 1996 - autumn 1996 |
summer 1997 - autumn 1997 | summer 1998 - autumn 1998 |
summer 2006 - autumn 2006 | |
summer 2007 - autumn 2007 | |
summer 2008 | summer 2010 - autumn 2010 |
summer 2011 - autumn 2011 | |
summer 2012 - autumn 2012 | summer 2013 - autumn 2013 |
summer 2015 - autumn 2015 | summer 2016 - autumn 2016 |
summer 2019 - autumn 2019 | summer 2020 - autumn 2020 |
summer 2021 - autumn 2021 (concurrent La Niña event in autumn) | |
summer 2022 - autumn 2022 |
Figure 3. Dipole Mode Index (DMI) time series representation
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Saji, N., Goswami, B., Vinayachandran, P. and T. Yamagata, 1999: A dipole mode in the tropical Indian Ocean, Nature, 401, 360-363, doi.org/10.1038/43854.