Abstract
The modern atmospheric observation and literatural historical drought-flood records were used to extract the inter-decadal signals of dry-wet modes in eastern China and reveal the possible relationship of global and China temperature changes associated with the East Asian summer monsoon advances. A climate pattern of “wet-north and dry-south” in eastern China and cool period in China and globe are associated with the strong summer monsoon that can advance further to the northernmost part in the East Asian monsoon region. On the contrary, a climate pattern of “dry-north and wet-south” in eastern China and a warm period in China and globe are associated with the weaker summer monsoon that only reaches the southern part in the region. An interdecadal oscillation with the timescale about 60 years was found dominating in both the dry-wet mode index series of the East Asian summer monsoon and the global temperature series after the secular climate states and long-term trend over inter-centennial timescales have been removed.
Highlights
The modern atmospheric observation and literatural historical drought-flood records were used to extract the inter-decadal signals of dry-wet modes in eastern China and reveal the possible relationship of global and China temperature changes associated with the East Asian summer monsoon advances
A climate pattern of “wet-north and dry-south” in eastern China and cool period in China and globe are associated with the strong summer monsoon that can advance further to the northernmost part in the East Asian monsoon region
A climate pattern of “dry-north and wet-south” in eastern China and a warm period in China and globe are associated with the weaker summer monsoon that only reaches the southern part in the region
Summary
Five datasets with different analysis methods were used in study. The first is the US Climate Prediction Center (CPC) Merged Analysis of Precipitation (CMAP) and it is derived from http://www.esrl.noaa.gov/psd/, during 1979–2007 with spatial resolution of 2.5° grids [7]. Four long-term series of summer/annual precipitation and temperature for about a century are derived from the Beijing and Macao stations. The fifth type of data is the China annual-mean temperature in the last century [12] and the global-mean temperature based on the Mann’s series reconstructed for the past two millennia [13], including temperature change in decadal, inter-decadal and centennial timescales. In order to analyze the relationship between the global-mean temperature change and the drywet mode variation in eastern China, two long-term climate states from the MWP and LIA and a long-term trend for the period of the GWP have been removed [14]. After removing climate states and the long-term trend, a temperature anomaly series was derived and used to find its decadal and interdecadal signals
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