Peru‐Chile upwelling dynamics under climate change
Peru‐Chile upwelling dynamics under climate change
复制标题
气候变化下的秘鲁-智利上升流动态
DOI：
10.1002/2014jc010299
复制
发表时间：
2015
影响因子：
--
通讯作者：
A. Belmadani
中科院分区：
文献类型：
--
作者：
V. Oerder;F. Colas;V. Echevin;Francis Codron;J. Tam;A. Belmadani
全球变暖对秘鲁-智利海流系统（PCCS）的海洋环流的后果进行检查与高分辨率，涡分辨区域海洋模式。利用IPSL-CM 4耦合大气环流模式（CGCM）对不同CO2浓度水平下的气候情景进行了动力降尺度分析。区域海洋模式的高分辨率大气强迫是从IPSL大气模式中获得的，该模式在PCCS区域的水平分辨率增加的拉伸网格上运行。当比较未来的情况下，工业化前（PI）的条件下，流通沿着的秘鲁和智利海岸强烈修改的变化，地面风和增加层结所造成的区域变暖。在沿岸极向暗流增强的同时，赤道沿岸急流浅滩和近岸中尺度活动也得到加强。沿岸风应力和近岸风应力旋度的减少导致秘鲁海域上升流强度的全年减少。在南半球夏末，地转环流的变化减轻了上升流的减少。上升流源沃茨的深度在较温暖的条件下变浅，这可能对系统的生物生产力产生重大影响。
The consequences of global warming on the Peru-Chile Current System (PCCS) ocean circulation are examined with a high-resolution, eddy-resolving regional oceanic model. We performed a dynami-cal downscaling of climate scenarios from the IPSL-CM4 Coupled General Circulation Model (CGCM), corresponding to various levels of CO 2 concentrations in the atmosphere. High-resolution atmospheric forcing for the regional ocean model are obtained from the IPSL atmospheric model run on a stretched grid with increased horizontal resolution in the PCCS region. When comparing future scenarios to preindustrial (PI) conditions, the circulation along the Peru and Chile coasts is strongly modified by changes in surface winds and increased stratification caused by the regional warming. While the coastal poleward undercurrent is intensified, the surface equatorial coastal jet shoals and the nearshore mesoscale activity are reinforced. Reduction in alongshore wind stress and nearshore wind stress curl drive a year-round reduction in upwelling intensity off Peru. Modifications in geostrophic circulation mitigate this upwelling decrease in late austral summer. The depth of the upwelling source waters becomes shallower in warmer conditions, which may have a major impact on the system's biological productivity.
影响因子：
6.3
作者：
Gabey, A. M.;Gallagher, M. W.;Stanley, W. R.
通讯作者：
Stanley, W. R.
影响因子：
3.2
作者：
Narayan, N.;Paul, A.;Schulz, M.
通讯作者：
Schulz, M.