| Weather and Climate |
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| Reconstruction of East-Asian Summer Sea-level Pressure During 1470-2008
and Its Comparison with Simulated Sea-level Pressure |
| LI Qian1,2,3, WEI Feng-ying2, LI Dong-liang1 |
1.College of Atmospheric Science/Ministry of Education Key Laboratory of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2.State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China; 3.Shanxi Provincial Climate Center, Xian 710014, China |
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Abstract Based on the well coupling relationship between the drought/flood distribution in eastern China and the East-Asian summer sea-level pressure, the East-Asian sea-level pressure (SLP) in summer during 1470-2008 was reconstructed by using the drought/flood grade data from 90 meteorological stations in eastern China, the SLP data during 1850-2008 and the principal component regression (PCR) method. Meanwhile, the reconstructed SLP result was compared with the simulated SLP by FGOALS_gl model. Results showed that the reconstructed SLP in key areas of the East-Asian summer monsoon (EASM), i.e. China and some part of the Northwest Pacific, was more credible than in other areas. The primary spatial variation of the reconstructed SLP during 1470-2008 were existed between high-latitude area and middle-latitude area as well as between sea and land, while the primary spatial variation of the stimulated SLP during 1470-1999 were only between sea and land. The EASM defined by the reconstructed SLP showed obviously periodical change. The strength of reconstructed EASM was relatively strong from mid-16th century to the early 17th century and relatively weak during 17th century. The EASM experienced 4 cycles of "weak-strong-weak-strong-weak" during 18th century and 3 cycles of "strong-weak-strong-weak" during 19th century. During 20th century, the EASM had obvious change of "weak-strong-weak". The primary difference between the reconstructed and simulated EASM appeared at the end of 16th and 18th century, and the trend in the other times was basically consistent.
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Received: 03 December 2011
Published: 20 July 2012
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2012, Vol. 32 
