2012 年夏季北太平洋中纬度西部海面极端变暖的原因

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Zhiyuan Li, Gangfeng Wu, Chang Xu, Jing Zhao, Mengqiao Wang, Jie Sheng, Yi Shen, Xiao-Hua Zhu
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引用次数: 0

摘要

本研究调查了 2012 年夏季北太平洋中纬度西部(MLWNP)的一次极端海面变暖现象。2012 年极端事件的特点是海面温度异常(SSTA)从东海/日本海延伸至北太平洋中部。2012 年,MLWNP(130-180°E,33-50°N)上空的 SSTA 箱均值为近 40 年来第三暖,导致该地区出现强烈的海洋热浪。2012 年夏季,印度洋偶极子事件与厄尔尼诺现象同时发生,有利于两个盆地之间的异常水汽输送,导致中国南海和菲律宾海以及亚热带太平洋中西部的对流活动增强。对流活动的增强引发了两个经向大气罗斯比波列,在多变西北太平洋形成了强大的大气阻塞高压系统。这降低了总云量和地面风速,增强了日照,减少了潜热通量的释放。此外,减弱的风力加强了分层,并使混合层受阻。因此,进入海洋的净热通量增加,同时混合层变浅,导致了多变西北太平洋上层海洋变暖。与此同时,北太平洋受太平洋十年涛动(PDO)负涛动阶段的影响,大大加剧了 2012 年大西北海域的暖 SSTA。因此,2012 年大西北极端变暖是大气罗斯比波和 PDO 共同作用的结果。我们的研究强调了高频大气远缘联系和低频 PDO 在多伦多-西北太平洋极端海面变暖中的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The cause of an extreme sea surface warming in the midlatitude western North Pacific during 2012 summer
This study investigated an extreme sea surface warming in the midlatitude western North Pacific (MLWNP) during the summer of 2012. The 2012 extreme event was characterized by warm sea surface temperature anomaly (SSTA) extending from the East/Japan Sea to central North Pacific. The SSTA box–averaged over the MLWNP (130–180°E, 33–50°N) in 2012 ranked as the third warmest in recent four decades, which has caused intense marine heatwaves in this region. During the summer of 2012, a positive Indian Ocean Dipole event co-occurred with El Niño, favoring anomalous moisture transport between the two basins that caused enhanced convection in the South China and Philippine Seas and western–to–central subtropical Pacific. The enhanced convective activities triggered two meridional atmospheric Rossby wave trains to form strong atmospheric blocking high–pressure systems in the MLWNP. This reduced the total cloud cover and surface wind speed, enhancing insolation and reducing the release of latent heat flux. In addition, the weakened wind strengthened the stratification and shoaled the mixed layer. As a result, the increased net heat flux into the ocean accompanied by a shallower mixed layer contributed to the upper ocean warming in the MLWNP. Meanwhile, the North Pacific was dominated by a negative phase of Pacific Decadal Oscillation (PDO), significantly contributing to warm SSTAs in the MLWNP in 2012. Consequently, the 2012 extreme warming in the MLWNP was the results of the combination of atmospheric Rossby waves and PDO. Our study highlighted the roles of high–frequency atmospheric teleconnection and low–frequency PDO in extreme sea surface warming in the MLWNP.
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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