| Popis: |
Satellite observations and in situ BGC-Argo profiles are used to explore the impacts of two sequential tropical cyclones (TCs) Man-yi and Pabuk in 2013 on the distribution of chlorophyll-a (CHL) and dissolved oxygen (DO) concentration. After the passages of TCs, apparent CHL enhancement is observed mainly resulting from TC-induced vertical mixing and upwelling as well as the favorable conditions of the near-shore area. CHL blooming patches correspond to the pre-existing cyclonic eddies (CEs) owing to their relatively unstable thermodynamic structures. While in anti-cyclonic eddies (AEs), CHL concentration is likely to maintain at a lower value because of weaker stratification inside AEs. A significant increase of near-surface DO concentration is detected, which is caused by TC-induced vertical mixing and photosynthesis of increased CHL. Conversely, subsurface DO decreases, accompanied by a drop of maximum DO and oxycline depth, mainly due to the strong upwelling induced by TCs and the CE. |
