ZHANG Lichuan,HUA Wei.Variation Characteristics of the Spring Asian-Pacific Oscillation and its Relationship with Winter Sea Level Pressure in the Northern Indian Ocean[J].Journal of Chengdu University of Information Technology,2026,41(01):102-107.[doi:10.16836/j.cnki.jcuit.2026.01.014]
春季亚洲-太平洋涛动变化特征及与前期冬季北印度洋海平面气压的关系
- Title:
- Variation Characteristics of the Spring Asian-Pacific Oscillation and its Relationship with Winter Sea Level Pressure in the Northern Indian Ocean
- 文章编号:
- 2096-1618(2026)01-0102-06
- 分类号:
- P467
- 文献标志码:
- A
- 摘要:
- 为分析近几十年来春季亚洲-太平洋涛动APO的基本特征及其前期影响因子,基于英国东英格利亚大学气候研究所(CRU)降水量资料、全球陆面数据同化系统(GLDAS)土壤湿度资料以及美国国家环境预报中心和美国国家大气研究中心(NCEP/NCAR)环流场再分析资料,采用相关性分析和合成分析对1961-2020年春季APO的时空特征及其与前期冬季北印度洋地区NIO海平面气压SLP的年际关系进行分析。结果表明,近几十年春季亚洲大陆和北太平洋对流层中上层存在扰动温度的反位相变化特征,即当以青藏高原为中心的亚洲大陆上空对流层中上层偏高时,中东太平洋地区对流层中上部偏低,反之亦然。春季APO与前期冬季NIO SLP存在显著的负相关关系,即当前期冬季NIO SLP年际偏强(弱)时,春季APO强度有所偏弱(强),其原因为当前期冬季NIO SLP偏低(高)时,NIO 上空上升运动偏强(弱),青藏高原及周边地区上空以下沉(上升)运动为主,进而导致青藏高原地区降水量和土壤含水量偏低(高),土壤湿度异常将持续至春季,并引起地面感热加热偏强(弱),使高原上空对流层扰动温度出现正(负)异常,最终导致春季APO偏强(弱)。
- Abstract:
- To analyze the basic characteristics and antecedent factors influencing the Asian-Pacific Oscillation(APO)in spring over recent decades, this study utilizes precipitation data from the Climate Research Unit(CRU)of the University of East Anglia, soil moisture data from the Global Land Data Assimilation System(GLDAS), and circulation reanalysis data from the National Centers for Environmental Prediction/National Center for Atmospheric Research(NCEP/NCAR). Employing correlation and composite analyses, we investigate the spatiotemporal characteristics of the spring APO from 1961 to 2020 and its interannual relationship with the preceding winter sea level pressure(SLP)over the North Indian Ocean(NIO). The results indicate that over the past few decades, there has been an out-of-phase variation in the upper and middle tropospheric temperature anomalies over the Asian continent and the North Pacific during spring. When the upper and middle troposphere over the Asian continent, centered on the Tibetan Plateau, is anomalously warm, the upper and middle troposphere over the central-eastern Pacific tends to be anomalously cool, and vice versa. A significant negative correlation exists between the spring APO and the preceding winter NIO SLP.Specifically, when the NIO SLP is anomalously high(low)in winter, the spring APO tends to be weaker(stronger). This phenomenon can be attributed to the fact that when the winter NIO SLP is lower(higher), the upward motion over the NIO strengthens(weakens), leading to dominant subsidence(ascent)over the Tibetan Plateau and its surrounding regions. Consequently, this results in lower(higher)precipitation and soil moisture over the Tibetan Plateau, with the soil moisture anomalies persisting into spring. These anomalies cause stronger(weaker)sensible heat flux at the surface, leading to positive(negative)tropospheric temperature anomalies over the plateau, ultimately resulting in a stronger(weaker)spring APO.
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备注/Memo
收稿日期:2024-07-01
基金项目:国家自然科学基金资助项目(42275022),第二次青藏高原综合科学考察研究资助项目(2019QZKK010203)
通信作者:华维.E-mail:huawei@cuit.edu.cn