Enhancement of the summer North Atlantic Oscillation influence on Northern Hemisphere air temperature |
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Authors: | Wei Yuan Jianqi Sun |
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Institution: | [1]China Meteorological Administration Training Centre, Beijing 100081 [2]Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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Abstract: | This study investigates the relationship between the summer North Atlantic Oscillation (SNAO)
and the simultaneous Northern Hemisphere (NH) land surface air temperature (SAT) by using the Climate
Research Unit (CRU) data. The results show that the SNAO is related to NH land SAT, but this linkage has
varied on decadal timescales over the last 52 years, with a strong connection appearing after the late
1970s, but a weak connection before. The mechanism governing the relationship between the SNAO and NH
land SAT is discussed based on the NCEP/NCAR reanalysis data. The results indicate that such a variable
relationship may result from changes of the SNAO mode around the late 1970s. The SNAO pattern was centered
mainly over the North Atlantic before the late 1970s, and thus had a weak influence on the NH land SAT.
But after the late 1970s, the SNAO pattern shifted eastward and its southern center was enhanced in
magnitude and extent, which transported the SNAO signal to the North Atlantic surrounding continents and
even to central East Asia via an upper level wave train along the Asian jet. |
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Keywords: | Summer North Atlantic Oscillation surface air temperature wave train |
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