Affiliation:
1. Department of Atmospheric and Oceanic Sciences Institute of Atmospheric Sciences Fudan University Shanghai China
2. Shanghai Frontiers Science Center of Atmosphere‐Ocean Interaction Fudan University Shanghai China
3. Southern Laboratory of Ocean Science and Engineering School of Marine Sciences Nanjing University of Information Science and Technology Nanjing China
4. CMA‐FDU Joint Laboratory of Marine Meteorology Fudan University Shanghai China
Abstract
AbstractThe North Pacific Gyre Oscillation (NPGO), Pacific Decadal Oscillation, and El Niño‐Southern Oscillation are climate fluctuations in the Pacific. Mesoscale eddies dominate the ocean kinetic energy spectrum. By analyzing the altimetry data, a close linkage between these climate fluctuations and eddy propagation speed is found. Propagation speeds of both cyclonic and anticyclonic eddies in the regions of 10° ∼ 20°N, 120°–180°E and 35° ∼ 45°N, 160°E−160°W are faster in the NPGO negative phase than positive phase, while those in the area of 25° ∼ 35°N, 150°E−170°W are opposite. These differences between positive and negative phases are the response of large‐scale circulation modulated by NPGO. When these climate fluctuations support the same westward/eastward anomaly of circulation, the eddies can propagate much faster/slower than that only considering NPGO. Causality analysis verifies that climate fluctuations can have strong influences on eddy movement. These climate fluctuations can affect the water mass, heat and salt transport by eddy advection.
Publisher
American Geophysical Union (AGU)
Subject
General Earth and Planetary Sciences,Geophysics