| WANG Zhaoyun,ZHAI Fangguo,LI Peiliang. 2016. A shift in the upper-ocean temperature trends in the South China Sea since the late 1990s. Acta Oceanologica Sinica, 35(11):44－51 |
| A shift in the upper-ocean temperature trends in the South China Sea since the late 1990s |
| 20世纪90年代后期南海上层海温变化趋势的转折 |
| Received:October 27, 2015 Revised:November 30, 2015 |
| DOI：10.1007/s13131-016-0947-1 |
| Key words:South China Sea sea surface temperature trend interdecadal variability heat budget |
| 中文关键词: 南海 海表面温度 趋势 年代际变化 热收支 |
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| Abstract: |
| In this paper, the interdecadal variability of upper-ocean temperature in the South China Sea (SCS) is investigated based on several objectively analyzed data sets and two reanalysis data sets. The trends of the SCS sea surface temperature (SST) have changed from warming to cooling since the late 1990s. A heat budget analysis suggests that the warming of the surface mixed layer during 1984-1999 is primarily attributed to the horizontal heat advection and the decrease of upward long wave radiation, with the net surface heat flux playing a damping role due to the increase of upward latent and sensible heat fluxes. On the other hand, the cooling of the surface mixed layer during 2000-2009 is broadly controlled by net surface heat flux, with the radiation flux playing the dominant role. A possible mechanism is explored that the variation of a sea level pressure (SLP) over the North Pacific Ocean may change the prevailing winds over the SCS, which contributes to the change of the SST in the SCS through the horizontal heat advection and heat fluxes. |
| 中文摘要: |
| 基于几种客观分析数据集和两个再分析数据集，本文研究了南海上层海温的年代际变化特征。在20世纪90年代后期，南海海表面温度由升温趋势转变为降温趋势。通过热收支分析，研究发现1984至1999年期间南海上混合层的升温趋势主要是由水平热输送和向上的长波辐射减少导致的；由于感热通量和潜热通量的增多，净热通量对升温趋势起抑制作用。另一方面，引起2000至2009年期间上混合层降温趋势的主要因素是净热通量，其中辐射通量的变化起主要作用。本文探究出一个导致上述现象可能机制：北太平洋海表面气压的异常变化会影响南海上层盛行风，进而通过改变水平热输送项和热通量项改变南海SST的变化趋势。 |
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