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Impact of Kuroshio Extension dipole mode variability on the North Pacific storm track

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Atmospheric and Oceanic Science Letters 2017年第5期10卷 389-396页

作者： ZHANG Jie luo de-hai Key Laboratory of Regional Climate–Environment for East Asia Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

An index of a large-scale Kuroshio Extension（KE） sea surface height dipole（KED） mode is constructed using satellite altimeter sea level anomaly observations from January 1993 to december 2015 based on previous work of the second author. It is found that the KED mode that undergoes a decadal variation from a negative phase（a positive-over-negative dipole, KED.） to a positive phase（a negative-over-positive dipole, KED＋） can affect the variability of the oceanic SST front and the North Pacific storm track. The results show that the oceanic SST fronts in the north of the KE region and in the KE region — referred to as the NSST and KSST fronts, respectively — are closely correlated with the KED mode. In the NSST front region, the SST front is stronger for KED. than for KED＋, and the opposite is the case in the KSST region. It is further revealed that the decadal phase transition of the KED mode can change the location and strength of the North Pacific storm track, with the North Pacific storm track being slightly weaker and moving more northwards as a whole during the KED. mode than during the KED＋ mode. The westerly wind associated with the storm track on the downstream side of the KE region intensifies and shifts northwards under KED. compared to KED＋.Furthermore, the transition of the KED mode gives rise to changes in the North Pacific storm track by changing the NSST and KSST fronts and meridional heat flux.

关键词： Kuroshio Extension oceanic front North Pacific storm track

The Anomalous European Climates Linked to Different Euro-Atlantic Blocking

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Atmospheric and Oceanic Science Letters 2014年第4期7卷 309-313页

作者： YAO Yao luo de-hai Key Laboratory of Regional Climate-Environment for Temperate East Asia (RCE-TEA) Institute of Atmospheric Physics Chinese Academy of Sciences Physical Oceanography Laboratory College of Physical and Environmental Oceanography Ocean University of China

The impact on temperature and precipitation anomalies over the European continent of the different action centers of blocking events in the Euro-Atlantic sector was investigated. It was found that the position of the blocking action center in the Euro-Atlantic region seems to dominate European climates. When the center of the blocking action is in the Greenland region, there is a strong negative temperature anomaly over Central and Northern Europe, as well as a strong positive precipitation anomaly over southern Europe. However, there tends to be a strong negative temperature anomaly in the west(east) part of Europe when the center of the blocking action is shifted to the Eastern Atlantic and west Europe(east Europe). In particular, when the blocking action center is closer to the European continent, the fall in temperature becomes more evident over Central and south Europe than over other regions. Moreover, it was found that when the region where the blocking action center exists changes from the Eastern Atlantic and west Europe region to the east Europe region, the existing region of dominant positive precipitation anomalies varies from southwest Europe to southeast Europe and the Middle East.

关键词： blocking action center temperature precipitation climate

Response of the Kuroshio Current to Eddies in the Luzon Strait

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Atmospheric and Oceanic Science Letters 2010年第3期3卷 160-164页

作者： Zhao Jie luo de-hai College of Physical and Environmental Oceanography Ocean University of China Qingdao 266100 China

The impact of eddies on the Kuroshio Current in the Luzon Strait (LS) area is investigated by using the sea surface height anomaly (SSHA) satellite observation data and the sea surface height (SSH) assimilation data. The influence of the eddies on the mean current depends upon the type of eddies and their relative position. The mean current is enhanced (weakened) as the cyclonic (anticyclonic) eddy becomes slightly far from it, whereas it is weakened (enhanced) as the cyclonic (anticyclonic) eddy moves near or within the position of the mean current; this is explained as the eddy-induced meridional velocity and geostrophic flow relationship. The anticyclonic (cyclonic) eddy can increase (decrease) the mean meridional flow due to superimposition of the eddy-induced meridional flow when the eddy is within the region of the mean current. However, when the eddy is slightly far from the mean current region, the anticyclonic (cyclonic) eddy tends to decrease (increase) the zonal gradient of the SSH, which thus results in weakening (strengthening) of the mean current in the LS region.

关键词： eddies Kuroshio Current Luzon Strait

PROPAGATION OF LONG-LIVED ANTICYCLONIC ROSSBY EDDIES OVER AN ISOLATED TOPOGRAPHY AND THEIR MERGING

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Journal of Hydrodynamics 2001年第3期13卷 34-45页

作者： luo, de-hai Lu, Yan Ocean Univ. of Qingdao Qingdao 266003 China

In a barotropic model the propagation of long-lived anticyclonic Gaussian eddies larger than the radius of deformation over a Gaussian-shaped topography and the merging of the two anticyclonic eddies are investigated by solving the generalized Flierl-Yamagata equation. It is shown that whether or not the basic flow is present, the isolated topography seems to encourage the amplification of an anticyclonic eddy and its southwest movement around the hill In the absence of both the westward flow and the topography, two anticyclonic eddies of identical sizes and amplitudes can merge. However, either the including of the topography or the westward basic flow can make them not merge. In the presence of both, the eddies can merge, but this merging depends on whether the parameter condition is appropriate or not. Therefore, it can be concluded that the topographic forcing might be a possible mechanism for the merging of two anticyclonic eddies.

关键词： Amplification Equations of motion Merging Surface topography Two dimensional

Spatiotemporal characteristics of the sea level anomaly in the Kuroshio Extension using a self-organizing map

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Atmospheric and Oceanic Science Letters 2016年第6期9卷 471-478页

作者： MA Fang DIAO Yi-Na luo de-hai College of Oceanic and Atmospheric Sciences Ocean University of China Key Laboratory of Regional Climate-Environment for Temperate East Asia Key Laboratory of Regional Climate-Environment for Temperate East Asia Chinese Academy of Sciences

Satellite altimeter SSH data in the Kuroshio Extension （KE） region gathered during the period January 1993 to december 2014 are analyzed using self-organizing map （SOM） analysis. Four spatial patterns （SOM1, SOM2, SOM3, and SOM4） are extracted, and the corresponding time series are used to characterize the variation of the sea level anomaly. Except in some individual months, SOM1 and SOM2 with single-branch jet structures appear alternately during the periods 1993-1998 and 2002-2011. However, during 1999-2001 and 2012-2014, SOM3 and SOM4 with double-branch jet structures are *** sea level anomalies exhibit interannual variations, while the KE stream demonstrates decadal variation. For SOM1, the change in the KE path is less evident, although the KE jet is strong and narrow. For SOM2, the KE jet is weakened and widened and its jet axis moves towards the southwest. Compared with the SOM3, for SOM4 the trough and ridge in the upstream KE region are deeper in the northeast-southwest direction, and accompanied by a jet weakening and *** study shows that SOM analysis is a useful approach for characterizing KE variability.

关键词： Sea level anomaly selforganizing map analysis self-organizing map patterns jet variability

Amplified winter Arctic tropospheric warming and its link to atmospheric circulation changes

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Atmospheric and Oceanic Science Letters 2017年第6期10卷 435-445页

作者： HUANG Xian-Ting DIAO Yi-Na luo de-hai College of Atmospheric and Ocean Sciences Physical Oceanography Laboratory/CIMST Ocean University of China & Qingdao National Laboratory for Marine Science and Technology CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences

The physical cause of amplified deep Arctic tropospheric warming in winter in the Barents-Kara Seas （BKS） is examined. The authors propose that changes in the atmospheric circulation patterns are important for deep Arctic tropospheric warming in winter. It is found that the retrograde Urals blocking （UB） event concurrent with a negative North Atlantic Oscillation （NAO-） that arises from a prior negative Arctic Oscillation （AO-） is not favorable for tropospheric warming because of less water vapor over the BKS. Such UB events are related to more winter BKS sea ice associated with the negative sea surface temperature （SST） anomaly in the BKS. In contrast, a UB occurring together with a positive North Atlantic Oscillation （NAO~） shows less movement and can significantly enhance tropospheric warming over the BKS through increasing tropospheric sensible heat energy due to a persistent BKS water vapor increase. This type of quasi-stationary UB event is related to prior less BKS sea ice associated with a positive BKS SST anomaly that coexists with the North Atlantic SST tripole structure. In summary, because warm, wet and low sea-ice winters in the BKS are related to UB events with an NAO~, and depend on the winter prior sea-ice condition, the tropospheric warming is to some extent a manifestation of the sea-ice-blocking-moisture feedback in the BKS.

关键词： Arctic warming Uralblocking NAO water vapor sensible heat energy

ON THE Benjamin-Ono EQUATION AND ITS GENERALIZATION IN THE ATMOSPHERE

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Science China Chemistry 1989年第10期32卷 1233-1245页

作者：罗德海 Institute of Atmospheric Physics Academia Sinica Beijing 100080. PRC

This paper deals with the nonlinear problems of the two-layer shallow water wave modelin the atmosphere by the multiple scale method and points out that a nonlinear Benjamin-Ono equation may be obtained if the meridional disturbance wind is weak. Furthermore, thealgebraic solitary waves and nonlinear periodic waves are also calculated and the breakup ofan algebraic solitary wave at the initial time into two is discussed. It is found that the waveform steepens in this process, which is similar to the triggering process of squall lines inthe atmosphere. On the other hand, we also point out that when the meridional disturbancewind is strong, we may obtain a modified Benjamin-Ono equation, i. e. the Benjamin-Ono-KDV equation.

关键词： B-O equation algebraic solitary wave squall lines modified B-O equation

海洋中长生命反气旋涡在地形上的演变以及涡旋的合并现象

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海洋与湖沼 2000年第4期31卷 363-369页

作者：罗德海卢燕青岛海洋大学海洋环境学院青岛266003

通过对海洋中长生命反气旋涡在Gauss型孤立地形上演变的研究 ,发现地形对长生命反气旋涡的发展和传播有相当重要的影响。在无地形作用的情况下 ,仅有反气旋涡能够存在于向西的均匀基流中 ,这个涡是长生命的 ,并且在西移过程中有明显的... 详细信息

通过对海洋中长生命反气旋涡在Gauss型孤立地形上演变的研究 ,发现地形对长生命反气旋涡的发展和传播有相当重要的影响。在无地形作用的情况下 ,仅有反气旋涡能够存在于向西的均匀基流中 ,这个涡是长生命的 ,并且在西移过程中有明显的向西倾斜。然而当其上游存在一个孤立地形时 ,可以发现这个涡有一个向东的倾斜 ,它的强度将增强且向西的移速会增加 ,其规迹象陀螺的运动。另一方面 ,当两个强度相同的反气旋涡同时存在时 ,这两个涡并不合并 ,且能持续很长的时间。当这两个涡的上游存在一个孤立地形时 ,这两个涡可以产生合并 ,并形成一个强度相当大的涡。

关键词：海洋涡旋反气旋涡孤立地形演变合并

近几十年北半球孤立子阻塞和偶极子阻塞活动的对比研究

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中国海洋大学学报（自然科学版） 2010年第8期40卷 11-17页

作者：鹿翠华罗德海中国海洋大学山东青岛266003 山东省枣庄市气象局山东枣庄277101

对1958—1997年美国NCEP逐日高度场再分析资料进行低通滤波,利用滤波后的资料统计分析了北半球的孤立子阻塞和偶极子阻塞的地理位置分布、年际变化、季节特点等,又对大西洋、太平洋和乌拉尔山地区3个阻塞多发地的孤立子阻塞和偶极子阻... 详细信息

对1958—1997年美国NCEP逐日高度场再分析资料进行低通滤波,利用滤波后的资料统计分析了北半球的孤立子阻塞和偶极子阻塞的地理位置分布、年际变化、季节特点等,又对大西洋、太平洋和乌拉尔山地区3个阻塞多发地的孤立子阻塞和偶极子阻塞活动特点进行比较,发现偶极子阻塞的纬度主要活动带比孤立子阻塞偏北5~10个纬度;孤立子阻塞主要在大西洋地区和乌拉尔山区活动,偶极子阻塞主要发生在太平洋地区,无论孤立阻塞还是偶极子阻塞在60°W^140°W(即美洲地区)都是最少的;孤立子阻塞和偶极子阻塞都有明显季节变化,孤立子阻塞活动的纬度峰值区是春季、秋季和冬季一致,夏季最偏北;偶极子阻塞活动的纬度峰值区是夏秋季位置最偏南,冬季发生区最偏北。孤立子阻塞经度的季节性要比偶极子阻塞更显著,但夏季经度位置最偏东和冬季最偏西的特点一样;太平洋地区无论孤立子阻塞还是偶极子阻塞活动纬度区都比大西洋和乌拉尔山地区偏北5~10个纬度;孤立子阻塞和偶极子阻塞天数都是冬季最多,春季次之,孤立子阻塞天数夏、秋数量相差不多,秋季稍多,偶极子阻塞秋季最少;孤立子阻塞和偶极子阻塞都有逐年减少的趋势,两者具有相反的年际变化等一些有意义的结果。

关键词：孤立子阻塞偶极子阻塞统计研究