Annual amphidromes: a common feature in the ocean?

Chen, G.; Quartly, G.. 2005 Annual amphidromes: a common feature in the ocean? IEEE Geoscience and Remote-Sensing Letters, 2 (4). 425-427.

Before downloading, please read NORA policies.

Download (262kB) | Preview


The scientific term "amphidrome" is usually associated with tides in oceanography. The dozen tidal amphidromes observed in the ocean are critical points that determine the fundamental pattern of the global tidal system. Exploration of recently available satellite data with an unprecedented 1-2 decades duration suggests that an amphidrome is not a tide-only phenomenon in the ocean. Analysis of altimeter-derived sea level anomaly (SLA) data and radiometer-derived sea surface temperature (SST) data allows ten amphidromic points to be clearly identified in annual SLA and SST variations. These amphidromes are located in the tropical areas of the Pacific, Atlantic, and Indian oceans. Their existence implies that the annual cycle (in time) of the atmosphere-ocean system is translated into a rotary variation (in space) for many of the geophysical parameters. It can be concluded that annual amphidromes are common, the knowledge of which is of particular interest, given their annually "constant" nature, for the monitoring and understanding of oceanic, climatic, as well as biological variabilities at seasonal to decadal scales, which strongly affect many aspects of the natural and societal activities on the globe.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Additional Keywords: amphidrome, sea level, sea surface height, sea surface temperature, global, seasonal cycle
Related URLs:
Date made live: 16 Sep 2005 +0 (UTC)

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...