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Open AccessArticle

A Numerical Study on the Impact of High-Frequency Winds on the Peru Upwelling System during 2014–2016

by Linhui Wang 1, Huiwang Gao 1,2, Jie Shi 1,2 and Lian Xie 3,*
1
Key Laboratory of Marine Environment and Ecology, Ocean University of China, Ministry of Education, Qingdao 266100, China
2
Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
3
Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Box 8208, Raleigh, NC 27695-8208, USA
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(5), 161; https://doi.org/10.3390/jmse7050161
Received: 7 May 2019 / Revised: 19 May 2019 / Accepted: 21 May 2019 / Published: 25 May 2019
The contribution of high-frequency wind to the Peruvian upwelling system during 2014–2016 was studied using the Regional Ocean Modeling System (ROMS), forced by four different temporal resolution (six-hourly, daily, weekly, and monthly) wind forcing. A major effect of the high-frequency wind is its warming of the water at all depths along the Peruvian coast. The mechanism for the temperature changes induced by high-frequency wind forcing was analyzed through heat budget analysis, which indicated a three-layer structure. Vertical advection plays a leading role in the warming of the mixed layer (0–25 m), and enhanced vertical mixing balances the warming effect. Analysis suggests that around the depths of 25–60 m, vertical mixing warms the water by bringing heat from the surface to deeper depths. In waters deeper than 60 m, the effect of vertical mixing is negligible. The differences among the oceanic responses in the sensitivity experiments suggest that wind forcing containing variabilities at higher than synoptic frequencies must be included in the atmospheric forcing in order to properly simulate the Peru upwelling system. View Full-Text
Keywords: high-frequency wind; diurnal; upwelling; vertical velocity high-frequency wind; diurnal; upwelling; vertical velocity
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Wang, L.; Gao, H.; Shi, J.; Xie, L. A Numerical Study on the Impact of High-Frequency Winds on the Peru Upwelling System during 2014–2016. J. Mar. Sci. Eng. 2019, 7, 161.

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