中国东部夏季降水年际变化与同期东海潜热通量的关系

摘要/Abstract

摘要： 利用1985~2008年OAflux3、NCEP＼NCAR再分析资料与中国大陆东部108个站点的降水资料,应用回归和合成方法,分析了中国东部夏季降水的年际变化与同期东海及邻近海域潜热通量变异的关系。结果表明:东海及邻近海域(以下称东海)夏季潜热通量年际变化显著的区域位于东海区域,为与同期中国东部降水密切相关的关键区域。当东海的潜热通量偏高(低)时,中国东部长江以南地区上空盛行偏东北(西南)风异常,这将不(有)利于水汽由南向北的输送,从而可能使到达长江中下游流域及以北地区的水汽偏少(多);并且,长江中、下游流域为下沉(上升)气流和低层水汽辐散(辐合)正异常,对应降水偏少(偏多);华南地区为上升(下沉)气流和低层水汽辐合(辐散)正异常,对应降水偏多(偏少)。分析结果还表明,东海的潜热通量可通过影响东亚大气环流而成为引起中国东部夏季汛期降水年际异常的重要原因之一。

关键词: 潜热通量, 大气环流, 夏季降水, 东海

Abstract: Based on the OAFlux3, the NCEP/NCAR reanalysis data for the period of 1985-2008 and the daily data of summer precipitation at 108 observational stations of eastern China, the relationship between the inter-annual variations of summer precipitation in eastern China and the latent heat flux anomalies in the East China Sea (ECS) are analyzed by using the composite and the linear regression analysis methods. The mechanism of summer precipitation anomalies in eastern China caused by the latent heat flux in ECS is also further analyzed from the perspective of atmospheric zonal and meridional circulation and water vapor transport in East Asian area. In order to focus on the inter-annual timescles, the long-term trend in the variations of laten heat flux in ECS, summer precipitation in eastern China and atmospheric circulation over East Asia have been removed in this study. The analyzed results show that the latent heat flux displays strong inter-annual variations signal in ECS and is closely related to summer precipitation in eastern China. When the latent heat flux in ECS is above (below) normal in summer, an anomalous anticyclonic (cyclonic) circulation appears over the northwest Pacific and the northeasterly (southwesterly) anomalies appear over eastern China, which are unfavorable (favorable) for the northward transportation of water vapor and result in more (less) water vapor in South China and less (more) water vapor in the middle and lower reaches of the Changjiang River and north areas. Furthermore, the atmospheric zonal and meridional circulations will be manifested as a downward (upward) motion with a divergence (convergence) in low level and a convergence (divergence) in upper level can appear over the middle and lower reaches of the Changjiang River, which may result in less (more) summer rainfall. While in South China, the atmospheric zonal and meridional circulations will be manifested as upward (downward) anomaly and convergence (divergence) at low levels,which may result in more (less) summer rainfall. The variations of atmospheric zonal and meridional circulation and water vapor transportation over East Asia caused by the latent heat flux anomalies in ECS could lead to the precipitation anomalies in the above mentioned area. It is suggested that the abnormal change of the latent heat flux in ECS may be one of the most important factors for the abnormal of summer rainfall in East China on the inter-annual timescales.

Key words: latent heat flux, atmospheric circulation, summer precipitation, East China Sea

中图分类号:

P461

李翠华, 蔡榕硕, 谭红建. 中国东部夏季降水年际变化与同期东海潜热通量的关系[J]. 海洋学研究, 2013, 31(1): 26-34.

LI Cui-hua, CAI Rong-shuo, TAN Hong-jian. The relationship between inter-annual variations of summer precipitation in eastern China and latent heat flux in East China Sea[J]. Journal of Marine Sciences, 2013, 31(1): 26-34.

参考文献

[1] HUANG Rong-hui, CAI Rong-shuo, CHEN Ji-long, et al. Interdecaldal variations of drought and flooding disasters in China and their association with the East Asian climate system[J]. Chinese Journal of Atmospheric Sciences,2006,30(5):730-742.
黄荣辉,蔡榕硕,陈际龙,等.我国旱涝气候灾害的年代际变化及其与东亚气候系统变化的关系[J].大气科学,2006,30(5):730-742.
[2] ZHANG Qing-yun,TAO Shi-yan,PENG Jing-bei. The studies of meteorological disasters over China[J]. Chinese Journal of Atmospheric Sciences,2008,32(4):815-825.
张庆云,陶诗言,彭京备.我国灾害性天气气候事件成因机理的研究进展[J].大气科学,2008,32(4):815-825.
[3] HUANG Rong-hui, XU Yu-hong, ZHOU Lian-tong. The interdecadal variation of summer precipitaions in China and the drought trend in North China[J]. Plateau Meteorology,1999,18(4):465-476.
黄荣辉,徐予红,周连童.我国夏季降水的年代际变化及华北干旱化趋势[J].高原气象,1999,18(4):465-476.
[4] ZHANG Qing-yun, LV Jun-mei,YANG Lian-mei,et al. The interdecadal variation of precipitation pattern over China during summer and its relationship with the atmospheric internal dynamic processes and extra-forcing factors[J]. Chinese Journal of Atmospheric Sciences,2007,30(6):1 290-1 300.
张庆云,吕俊梅,杨莲梅,等.夏季中国降水型的年代际变化与大气内部动力过程及外强迫因子关系[J].大气科学,2007,30(6):1 290-1 300.
[5] PING Fan, LUO Zhe-xian, JU Jian-hua. The difference between the factors of the interdecadal and interannual variations in the Yangtze River Basin[J]. Chinese Science Bulletin,2006,51(1):104-109.
平凡,罗哲贤,琚建华.长江流域汛期降水年代际变化和年际变化影响因子的差异[J].科学通报,2006,51(1):104-109.
[6] LIANG Ping, DING Yi-hui, HE Jin hai. Relations between summer rainfall over the lower reach of Yangtze River and East Asian summer monsoon as well as sea surface temperature over the Pacific in spring[J]. Plateau Meteorology,2008,27(4):772-777.
梁萍,丁一汇,何金海.长江下游夏季降水与东亚夏季风及春季太平洋海温的关系[J].高原气象,2008,27(4):772-777.
[7] ZHANG Tian-yu, SUN Zhao-bo, LI Zhong-xian,et al. Relation between spring Kuroshio SSTA and summer rainfall in China[J]. Journal of Tropical Meteorology,2007,23(2):189-195.
张天宇,孙照渤,李忠贤,等.春季黑潮区海温异常与我国夏季降水的关系[J].热带气象学报,2007,23(2):189-195.
[8] CAI Rong-shuo, TAN Hong-jian, HUANG Rong-hui. The relationship between interannual variations of summer precipitation in eastern China and the SST anomalies in the East China Sea and its adjacent seas[J]. Chinese Journal of Atmospheric Science(in chinese),2012,36(1):35-46.
蔡榕硕,谭红建,黄荣辉.中国东部夏季降水年际变化与东中国海及邻近海域海温异常的关系[J].大气科学,2012,36(1):35-46.
[9] WU Ren-guang, YANG Song, WEN Zhi-ping, et al. Interdecadal change in the relationship of southern China summer rainfall with tropical Indo-Pacific SST[J]. Theor Appl Climatol,2012,108:119-133.
[10] LIU Xuan-fei, YUAN Hui-zhen, GUAN Zhao-yong. Effects of ENSO on the relationship between IOD and China summer rainfall[J]. Journal of Tropical Meteorology,2008,24(5):502-506.
刘宣飞,袁慧珍,管兆勇.ENSO对IOD与中国夏季降水关系的影响[J].热带气象学报,2008,24(5):502-506.
[11] TAO Yi-wei, SUN Zhao-bo, LI Wei-jing, et al. Relationships between ENSO and Qinghai-Tibetan plateau snow depth and their influences on summer rainfall anomalies in China[J]. Meteorological Monthly,2011,37(8):919-928.
陶亦为,孙照渤,李维京,等.ENSO与青藏高原积雪的关系及其对我国夏季降水异常的影响[J].气象,2011,37(8):919-928.
[12] LI Chun, HAN Xiao. Relationship of northern boundary of East Asian summer monsoon and summer precipitation in Eastern Part of China[J]. Plateau Meteorology,2008,27(2):325-330.
李春,韩笑.东亚夏季风北界与我国夏季降水关系的研究[J].高原气象,2008,27(2):325-330.
[13] ZHANG Li-ping, DING Yi-hui, CHEN Zheng-hong, et al. Association between global OLR and summer rainfall over the middle reachof Yangtze River[J]. Acta Meteorologica Sinica,2007,65(1):75-83.
张礼平,丁一汇,陈正洪,等.OLR与长江中游夏季降水的关联[J].气象学报,2007,65(1):75-83.
[14] SONG Yan, ZHANG Jing, LI Zhi-cai, et al. Interdecadal change of winter snow depth on tibetan plateau and its effect on summer precipitation in China[J]. Plateau Meteorology,2011,30(4):843-851.
宋燕,张菁,李智才,等.青藏高原冬季积雪年代际变化及对中国夏季降水的影响[J].高原气象,2011,30(4):843-851.
[15] XU Wen-ming, SUN Zhao-bo, ZENG Gang, et al. Summer precipitation in the middle-lower reaches of Yangtze River and its relationship with Global heat flux fields[J]. Journal of Nanjing Institute of Meteorology,2007,30(1):26-33.
徐文明,孙照渤,曾刚,等.长江中下游夏季降水及其与全球热通量的关系[J].南京气象学院学报,2007,30(1):26-33.
[16] DAI Cai-ti, ZHANG Ming. Correlation between latent heat transport over South China Sea and summer rainfall in Yangtze River Basin[J]. Meteorology and Disaster Reduction Research,2008,31(2):19-23.
戴彩悌,张铭.南海地区潜热输送与长江流域夏季降水的关系[J].气象与减灾研究,2008,31(2):19-23.
[17] LI Cui-hua, CAI Rong-shuo, CHEN Ji-long. Temporal and spatial characteristics of latent heat flux in the East China Sea and its association with summer rainfall in East China[J]. Plateau Meteorology,2010,29(6):1 485-1 492.
李翠华,蔡榕硕,陈际龙.东中国海夏季潜热通量的时空特征及其与中国东部降水的关联[J].高原气象,2010,29(6):1 485-1 492.
[18] CAI Rong-shuo, CHEN Ji-long, HUANG Rong-shui. The response of marine environment in the offshore area of China and its adjacent ocean to recent global climate change[J]. Chinese Journal of Atmospheric Science(in Chinese),2006,30(5):1 019-1 033.
蔡榕硕,陈际龙,黄荣辉.我国近海和邻近海的海洋环境对最近全球气候变化的响应[J].大气科学,2006,30(5):1 019-1 033.
[19] CAI Rong-shuo, ZHANG Qi-long, QI Qing-hua. Spatial and temporal oscillation and long-term variation in sea surface temperature field of the South China Sea[J].Journal of Oceanography in Taiwan Strait,2009,28(4):559-568.
蔡榕硕,张启龙,齐庆华.南海表层水温场的时空特征与长期变化趋势[J].台湾海峡,2009,28(4):559-568.
[20] CAI Rong-shuo, TAN Hong-jian. Influence of interdecadal climate variation over East Asia on offshore ecological system of China[J]. Journal of Oceanography in Taiwan Strait,2010,29(2):173-183.
蔡榕硕,谭红建.东亚气候的年代际变化对中国近海生态的影响[J].台湾海峡,2010,29(2):173-183.
[21] CAI Rong-shuo, CHEN Ji-long, TAN Hong-jian. Variations of sea surface temperature in the offshore area of China to their relationship with the East Asian monsoon under the global warming[J].Climatic and Environmental Research,2011,16(1):94-104.
蔡榕硕,陈际龙,谭红建.全球变暖背景下中国近海表层海温变异及其与东亚季风的关系[J].气候与环境研究,2011,16(1),94-104.
[22] YU L, JIN X, WELLER R A. Multidecade global flux datasets from the Objectively Analyzed air-sea Fluxes (OAFlux) Project: latent and sensible heat fluxes, ocean evaporation, and related surface meteorological variables[R]//Woods Hole Oceanographic Institution. OAFlux Project Technical Report.OA-2008-01:64.
[23] KALNAY E, KANAMITSU M, KISTLER R, el al. The NCEP/NCAR 40-year reanalysis project[J]. Bull. Amer. Meteor. Soc., 1996,77:437-471.
[24] LIU Na,WU De-xing,LIN Xiao-pei. Variations of eatent heat flux in the East China Sea during the last 50 Years[J]. Periodical of Ocean University of China,2010,40(4):19-25.
刘娜,吴德星,林霄沛.近50年东中国海潜热通量的变化[J].中国海洋大学学报,2010,40(4):19-25.
[25] WU R., KIRTMAN B, PEGION K. Local air-sea relationship in observations and model simulations[J]. J. Climate,2006,19:4 914-4 932.
[26] SUN Shu-qing, CHEN Juan. The varications of wind and thermodynamatics fields in the South China Sea in summer during the anomaly winter monsoon[J]. Climatic and Environmental Research,2000,4(5):400-416.
孙淑清,陈隽.异常东亚季风对夏季南海地区风场和热力场的影响[J].气候与环境研究,2000,4(5):400-416.