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Monitoring and Data >
Oceanic & Atmospheric Data >
Northern Hemisphere Teleconnection Patterns >
Asian Summer
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Map (Positive Phase) |
Plotted Historical Time Series : (January 1950-February
1997) |
| Table Archive of
Indices Dating Back to 1950 |
| Back to contents |
| Table showing Calendar months when specific teleconnection
patterns are important |
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| The Asian Summer pattern is a
prominent mode from June-August. The pattern is monopole in nature, with anomalies of the
same sign observed throughout southern Asia and northeastern Africa. A positive phase of
the pattern is indicated by above-normal heights throughout southern Asia and northeastern
Africa. The Asian Summer pattern exhibits considerable interannual and interdecadal
variability, with a pattern of one sign observed for several consecutive years, followed
by a pattern of the opposite sign for several consecutive years. For example, a positive
phase of the pattern dominated the summertime circulation from 1987-1990. This period was
preceded by a three-year period (1984-1987) in which the negative phase of the pattern was
prominent. |
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