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Scientists Reveal Large-scale Drivers of Prolonged Spring-Summer Drought over North China

May 07, 2018     Email"> PrintText Size

North China, where almost half of China's population lives and most wheat and corn are grown, is facing serious water crisis. Since the late 1990s, severe and extreme droughts have frequently occurred and the affected areas have been increasing by 3.72% per decade in the past five decades, posing great challenges for regional sustainable development.

Scientists have been concerned that if climate continues to warm, drought over North China may continue to increase. Thus, it is of great importance to identify the drivers and dynamic mechanisms of North China drought in order to improve drought prediction and better water management.

Scientists from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences, Met Office Hadley Centre and Beijing Climate Center revealed the large-scale dynamic drivers of the prolonged spring-summer drought (PSSD) over North China, where prolonged drought tends to begin in spring and persist to summer with severe societal impacts. Their findings were published in Journal of Climate.

  

Conceptual plot of air-sea interaction in (a) MAM and (b) JJA on sustaining the crucial circulations associated with PSSD over North China. Dash and solid lines denote the low-level and up-level circulation anomalies, respectively, while shading shows SSTA. (Image by IAP) 

Their study shows that seven of the selected eight North China PSSD events occurred when La Ni?a transited to El Ni?o with a negative North Pacific Oscillation (NPO) phase in preceding winter. The two key circulation anomalies in spring are set directly by a negative NPO phase generated in the preceding winter.

The NPO, in turn, forces an El Ni?o onset in summer through the so-called "seasonal footprinting mechanism". Consequently, sea surface temperature anomalies of El Ni?o in summer suppress Indian monsoon rainfall, triggering the tropospheric temperature cooling over East Asia through a circumglobal teleconnection along the East Asia upper-level westerly jet.

This study demonstrates that ENSO phase transition from La Ni?a to El Ni?o is one of the important precursors of North China PSSD. 

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(Editor: LI Yuan)

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