A case study of Chlorophyll a response to tropical cyclone Wind Pump considering Kuroshio invasion and air-sea heat exchange

• DOI: 10.1016/j.scitotenv.2020.140290
• Publication Date: 2020-06-18T01:31:24Z
• Authors: Yupeng Liu; Danling Tang; Shilin Tang; Evgeny Morozov; Wenzhao Liang; Yi Sui
• Keywords: Ekman transport; Mixed layer

New evidences provided that the tropical cyclone (TC) Linfa in 2015 induced looping path of Kuroshio invasion into northeastern South China Sea (NESCS) through northwestern Luzon Strait (LS), based on in-situ measurements, satellite data and model output data. This TC-enhanced with low nutrients denser waters suppressed TC “Wind Pump” upwelling uptake, therefore inhibited Chlorophyll a concentration (Chl-a) increase from surface to ~50 m open ocean NESCS. The TC-induced promoted generation strong cyclonic eddy its left side where weak Ekman Pumping Velocity was observed. enhancing then dominated uplift increased subsurface (0–50 m) Chl-a pumping rather than Pumping. TC-declined anti-cyclonic eddy, which shoaled Mixed Layer Depth (MLD), benefited nutrient uptake thereby raised Maximum (CML) ~20 over southwestern LS. temporal variations were also influenced by intensities biochemical processes. air-sea heat budget analysis indicated that, exchange contributed nearly 80% sea cooling (SST cooling) LS invasion, while eddy-induced SST western LS, wind-driven (and mixing) controlled These different formations played important role variations. study is first case considering exchange, mesoscale eddies would help evaluate influence TCs other major transport arteries world ocean: Gulf Stream area.