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Effects of double cropping on summer climate of the North China Plain and neighbouring regions

Jeong, Su-Jong and Ho, Chang-Hoi and Piao, Shilong and Kim, Jinwon and Ciais, Philippe and Lee, Yun-Bok and Jhun, Jong-Ghap and Park, Seon Ki (2014) Effects of double cropping on summer climate of the North China Plain and neighbouring regions. Nature Climate Change, 4 (7). pp. 615-619. ISSN 1758-678X. doi:10.1038/nclimate2266.

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The North China Plain (NCP) is one of the most important agricultural regions in Asia and produces up to 50% of the cereal consumed in China each year. To meet increasing food demands without expanding croplands, annual agricultural practice in much of the NCP has changed from single to double cropping. The impact of double cropping on the regional climate, through biophysical feedbacks caused by changes in land surface conditions, remains largely unknown. Here we show that observed surface air temperatures during the inter-cropping season (June and July) are 0.40 degrees C higher over double cropping regions (DCRs) than over single cropping regions (SCRs), with increases in the daily maximum temperature as large as 1.02 degrees C. Using regional climate modelling, we attribute the higher temperatures in DCRs to reduced evapotranspiration during the inter-cropping period. The higher surface temperatures in June and July affect low-level circulation and, in turn, rainfall associated with the East Asian monsoon over the NCP and neighbouring countries. These findings suggest that double cropping in the NCP can amplify the magnitude of summertime climate changes over East Asia.

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Piao, Shilong0000-0001-8057-2292
Additional Information:© 2014 Macmillan Publishers Limited. Received 04 November 2013; Accepted 25 April 2014; Published online 08 June 2014. This work was funded by the Korea Ministry of Environment as ‘Climate Change Correspondence R&D Program’, CATER 2012–2040, and NRF 2009-0083527. The funders had no role in the study design, data collection and analysis, decision to publish, or presentation of the manuscript. Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
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Korea Ministry of Environment 'Climate Change Correspondence R&D Program'UNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20140425-185555419
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45235
Deposited By: George Porter
Deposited On:25 Jun 2014 23:48
Last Modified:10 Nov 2021 17:01

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