Upper ocean heat content and atmospheric anomaly fields in the off-equatorial North Pacific related to ENSO
Upper ocean heat content and atmospheric anomaly fields in the off-equatorial North Pacific related to ENSO
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DOI：
10.1007/s10872-007-0050-5
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发表时间：
2007-08
影响因子：
2.3
通讯作者：
T. Hasegawa;K. Hanawa
中科院分区：
文献类型：
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作者：
T. Hasegawa;K. Hanawa
本文研究了热带太平洋海洋和大气异常场的年际变化及其与厄尔尼诺/南方涛动（ENSO）事件的关系。这些异常场包括上层海洋热含量（OHC）、海表温度（SST）、海表潜热通量（LHF）、海平面气压（SLP）和风应力旋度（WSC）等。结果表明，OHC和SST异常几乎同步，并导致热带西太平洋地区的LHF异常，这有利于热带西太平洋地区后续大气异常的产生。我们还描述了在theWTP这些变量的幅度之间的线性关系。此外，研究结果还表明，WTP地区的WSC和LHF异常与OHC异常的时间趋势一致，表明WTP地区的WSC和LHF异常与ENSO相关的、离赤道的、向西传播的OHC异常共同作用，在WTP地区产生了较大的OHC异常。与WTP相反，在WTP以东，OHC和SST异常不同步。结果还表明，西太平洋OHC异常通过西边界波的反射和大气的变化对赤道OHC异常的产生有潜在的影响，使西赤道OHC异常增强。因此，太平洋海温是ENSO事件发生的关键调制区，太平洋海温的OHC异常对随后的ENSO事件起着重要作用。
We have investigated interannual-scale variations of oceanic and atmospheric anomaly fields, such as upper ocean heat content (OHC), sea surface temperature (SST), latent heat flux (LHF) through the sea surface, sea level pressure (SLP) and wind stress curl (WSC) in the tropical Pacific and their relationships to El Niño/Southern Oscillation (ENSO) events. The results reported here show that the OHC and SST anomalies are almost in phase and lead LHF anomalies in the western tropical Pacific (WTP) region, which are preferable to the generation of subsequent atmospheric anomalies in theWTP. We also describe linear relationships between the amplitudes of these variables in theWTP. In addition, the results show that the both WSC and LHF anomalies are in phase with the temporal trend of OHC anomalies in theWTP, and suggest a combined effect of the local WSC and LHF anomaly in theWTPand ENSO-related, off-equatorial, westward propagating OHC anomaly to generate a large OHC anomaly in theWTP. In contrast to theWTP, OHC and SST anomalies are not in phase to the east of theWTP. The results also indicate that OHC anomalies in theWTPhave a potential effect on the generation of an equatorial OHC anomaly via both a reflection of waves at the western boundary and atmospheric variations, which force the enhancement of western equatorial OHC anomaly. Therefore, theWTPis a key region where ENSO events are significantly modulated, and OHC anomalies in theWTPplay an important role in the subsequent ENSO event.