Abstract
Under the background of global warming, summer (JJA) low temperature events in Northeast China had not occurred for about 15 yr since 1994, but one such event took place in 2009. By using the NCEP/NCAR reanalysis data, the 100-yr station temperature data at Harbin and Changchun, and the Hadley Center sea surface temperature (SST) data, this paper intends to reveal the cause, circulation background, and influencing factors of this event. Analysis of both horizontal and vertical circulations of a low-value system over Northeast China in summer 2009 during the low temperature event shows that anomalous activities of the Northeast China cold vortex (NECV) played the most direct role. A decadal cooling trend of — 0.8°C (10 yr)−1 over 1999–2008 at Changchun and Harbin was found, which is obviously out-of-phase with the linear warming trend (0.2°C (10 yr)−1) over 1961–2000 for Northeast China in response to the global warming. The previous winter North Pacific polar vortex (NPPV) area index, significantly positively related to the observed summer temperatures of Harbin and Changchun, was also in a significantly declining tendency. These provide favorable decadal backgrounds for the 2009 low temperature event. Different from the average anomaly field of 500-hPa height for summer 1994–2008 in Northeast China, in the summer of 2009, the Arctic Oscillation (AO) showed a strong negative phase distribution, and significant negative height anomalies dominated Northeast Asia, Aleutian Islands, and North Atlantic. Furthermore, the negative phase of North Pacific Oscillation (NPO) in the winter of 2008 was obviously strong, and it maintained in the spring of 2009. Meanwhile, the SSTA in the equatorial eastern-central Pacific Ocean in the winter of 2008 showed a La Niña phase, but the strength of the La Niña weakened obviously in the spring of 2009. The abnormally strong activities of NECV in June and July of 2009 were related to the disturbances of stationary waves that replaced the original ultra-long waves over the North Pacific region in April and May 2009. The singular value decomposition (SVD) and harmonic analysis results suggest that the anomalous phase of NPO is an important precursor for summer temperature variations over Northeast China, and also a stable planetary-scale component that can be extracted from the atmospheric circulation in addition to the chaotic components on the synoptic scale.
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Supported by the National Natural Science Foundation of China (41175083, 41275096, and 40705036), National Science and Technology Support Program of China (2009BAC51B04 and 2007BAC29B01), and China Meteorological Administration Special Public Welfare Research Fund (GYHY 20106020 and 201106016).
(Chinese version published in Vol. 69, No. 2, 320–333, 2011)
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Shen, B., Liu, S., Lian, Y. et al. The 2009 summer low temperature in northeast china and its association with prophase changes of the air-sea system. Acta Meteorol Sin 26, 438–453 (2012). https://doi.org/10.1007/s13351-012-0404-9
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DOI: https://doi.org/10.1007/s13351-012-0404-9