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Interdecadal Variations of Different Types of Summer Heat Waves in Northeast China Associated with AMO and PDO

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  • 1 a Key Laboratory of Meteorological Disaster of Ministry of Education, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China
  • | 2 b Regional Climate Center of Shenyang, Shenyang, China
  • | 3 c Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
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Abstract

The summer heat waves (HWs) in Northeast China (NEC) during 1961–2016 can be classified into two types, namely, wave train HWs and blocking HWs based on the hierarchical clustering algorithm by using ERA-Interim daily datasets. Wave train HWs occurred accompanied by eastward-moving wave trains with a “− + − +” structure formed over Eurasia, while the blocking HWs occurred with blocking circulation anomalies over Eurasia. In general, the blocking HWs could cause the positive temperature anomalies in NEC to last longer than wave train HWs. During the period from 1961 to 2016, the wave train HWs experienced an interdecadal variation from less to more, while the blocking HWs experienced interdecadal variations of less–more–less. Regression analysis and information flow indicate that the interdecadal variation of the wave train HWs is associated with Atlantic multidecadal oscillation (AMO) and Pacific decadal oscillation (PDO), while the interdecadal variation of the blocking HWs is more likely associated with PDO. The positive phase of AMO (negative phase of PDO) could increase the wave train (blocking) HWs by strengthening the zonal wave train similar to the Silk Road pattern (the arched wave train like the polar–Eurasian pattern). The observed results are in agreement with the numerical experiments with the NCAR Community Atmosphere Model, version 5.3.

Significance Statement

As global warming continues, heat waves continue to have severe impacts on human lives and the social economy. The heat waves in Northeast China can be objectively divided into wave train heat waves and blocking heat waves. In general, the wave train (blocking) heat waves have shorter (longer) durations. The Atlantic multidecadal oscillation and Pacific decadal oscillation are important causes of the interdecadal variation of the wave train heat waves and the blocking heat waves, respectively. The numerical experiments further verify the proposed mechanism. This study reveals the formation mechanism and interdecadal variations of two types of heat waves in Northeast China and provides some reference for future projection.

© 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Gang Zeng, zenggang@nuist.edu.cn

Abstract

The summer heat waves (HWs) in Northeast China (NEC) during 1961–2016 can be classified into two types, namely, wave train HWs and blocking HWs based on the hierarchical clustering algorithm by using ERA-Interim daily datasets. Wave train HWs occurred accompanied by eastward-moving wave trains with a “− + − +” structure formed over Eurasia, while the blocking HWs occurred with blocking circulation anomalies over Eurasia. In general, the blocking HWs could cause the positive temperature anomalies in NEC to last longer than wave train HWs. During the period from 1961 to 2016, the wave train HWs experienced an interdecadal variation from less to more, while the blocking HWs experienced interdecadal variations of less–more–less. Regression analysis and information flow indicate that the interdecadal variation of the wave train HWs is associated with Atlantic multidecadal oscillation (AMO) and Pacific decadal oscillation (PDO), while the interdecadal variation of the blocking HWs is more likely associated with PDO. The positive phase of AMO (negative phase of PDO) could increase the wave train (blocking) HWs by strengthening the zonal wave train similar to the Silk Road pattern (the arched wave train like the polar–Eurasian pattern). The observed results are in agreement with the numerical experiments with the NCAR Community Atmosphere Model, version 5.3.

Significance Statement

As global warming continues, heat waves continue to have severe impacts on human lives and the social economy. The heat waves in Northeast China can be objectively divided into wave train heat waves and blocking heat waves. In general, the wave train (blocking) heat waves have shorter (longer) durations. The Atlantic multidecadal oscillation and Pacific decadal oscillation are important causes of the interdecadal variation of the wave train heat waves and the blocking heat waves, respectively. The numerical experiments further verify the proposed mechanism. This study reveals the formation mechanism and interdecadal variations of two types of heat waves in Northeast China and provides some reference for future projection.

© 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Gang Zeng, zenggang@nuist.edu.cn
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