Response of Pacific subtropical-tropical thermocline water pathways and transports to global warming
Response of Pacific subtropical-tropical thermocline water pathways and transports to global warming
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DOI：
10.1029/2008gl036705
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发表时间：
2009-02-17
影响因子：
5.2
通讯作者：
Zhang, Rong-Hua
中科院分区：
文献类型：
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作者：
Luo, Yiyong;Rothstein, Lewis M.;Zhang, Rong-Hua
全球变暖可能改变太平洋从亚热带到热带的温跃层水通道和输送，这对厄尔尼诺-南方涛动（ENSO）以及全球气候具有深远的影响。本研究通过比较来自政府间气候变化专门委员会（IPCC）第四次评估报告（AR4）模式的当前气候和未来变暖气候的解决方案来调查这些变化。随着气候变暖，虽然从亚热带到热带的总输运量没有明显变化，但经西部边界通道的输运量增加，经内部通道的输运量减少。这种转变是由于高位涡（PV）区进一步向西延伸，从而动态地引导温跃层水从内部通道转向从亚热带到热带的西部边界通道。此外，气候变暖导致热带东部海面温度大幅升高，西太平洋和中太平洋赤道潜流（EUC）显著增强；前者与内陆通道输运减少有关，后者与西部边界通道输运增加有关。本文还讨论了本研究结果的意义。引用本文：Luo， Y.， L. M. Rothstein, and R.-H。张（2009），太平洋亚热带-热带温跃层水分通道和输送对全球变暖的响应，地球物理。卷。， 36, L04601, doi:10.1029/2008GL036705。
Global warming may change the thermocline water pathways and transports from the subtropics to the tropics in the Pacific Ocean, which are known to have profound implications for the El Nino-Southern Oscillation (ENSO) and thereby global climate. This study investigates the changes by comparing solutions between a present-day climate and a future, warmer climate from a set of Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) models. As the climate warms, although the total transport from the subtropics to the tropics exhibits no significant change, transport via western boundary pathways increases and via interior pathways decreases. This shift is due to high potential vorticity (PV) zones that extend further westward, thus dynamically guiding thermocline water away from interior pathways to prefer western boundary pathways from the subtropics to the tropics. Additionally, a warmer climate induces a large temperature increase near the sea surface in the eastern tropics and a significantly enhanced Equatorial Undercurrent (EUC) in the western and central Pacific; the former is related to the decreased transport through interior pathways and the latter is linked to the increased transport through western boundary pathways. Implications of the results of this study are also discussed. Citation: Luo, Y., L. M. Rothstein, and R.-H. Zhang (2009), Response of Pacific subtropical-tropical thermocline water pathways and transports to global warming, Geophys. Res. Lett., 36, L04601, doi:10.1029/2008GL036705.