Remotely Forced Decadal Physical and Biogeochemical Variability of North Pacific Subtropical Mode Water Over the Last 40 Years
Remotely Forced Decadal Physical and Biogeochemical Variability of North Pacific Subtropical Mode Water Over the Last 40 Years
复制标题
DOI：
10.1029/2018gl081330
复制
发表时间：
2019-02-16
影响因子：
5.2
通讯作者：
Ishii, Masao
中科院分区：
文献类型：
--
作者：
Oka, Eitarou;Yamada, Kodai;Ishii, Masao
对西北太平洋137度E重复断面长达半个世纪的观测进行了分析，以证明过去40年来副热带模式水(STMW)的远程强迫年代际物理和生物地球化学变异性。在黑潮伸展(KE)滞后太平洋年代际涛动暖相3-4年的不稳定时期，区域高涡旋活动降低了KE以南主要形成区的STMW的形成速度和盐度。在日本南部137°E剖面，富氧STMW自地层向西南平流的减少导致其截面积、溶解氧、pH和文石饱和度降低，营养盐和溶解无机碳增加，其中碳系统参数的变化加速了其长期趋势。在KE稳定期，这种变化逆转，酸化减缓，特别是自2010年以来的当前时期，出现了酸化中断。
Half-century-long observations at the 137 degrees E repeat hydrographic section across the western North Pacific have been analyzed to demonstrate remotely forced decadal physical and biogeochemical variability of Subtropical Mode Water (STMW) over the last 40 years. During unstable periods of the Kuroshio Extension (KE) that lagged the warm phase of the Pacific Decadal Oscillation by 3-4 years, high regional eddy activity reduced the formation rate and salinity of STMW in its main formation region south of the KE. At the 137 degrees E section south of Japan, decreasing southwestward advection of oxygen-rich STMW from the formation region resulted in decreases of its cross-sectional area, dissolved oxygen, pH, and aragonite saturation state and increases of nutrients and dissolved inorganic carbon, among which changes of the carbon system parameters accelerated their long-term trends. Such changes reversed and acidification slowed down during stable-KE periods, especially in the current period since 2010 exhibiting a hiatus of acidification.