Affordable Access

Publisher Website

Large Scale Air-Sea Interactions and Climate Predictability

Elsevier B.V.
DOI: 10.1016/s0422-9894(08)71120-6


Abstract After reviewing recent empirical studies of short-term climate predictability based on observations of the sea surface temperature (SST), the physical processes that govern the generation and decay of large scale SST anomalies are discussed. Using a slab model of the oceanic mixed layer, we find that large scale mid-latitude SST anomalies can be described as a first-order autoregressive process in regions of small mean current, as suggested by Frankignoul and Hasselmann (1977). The SST anomalies are continuously generated by the natural variability of the air-sea fluxes. Short time scale variations in the local heat exchanges seem dominant, although mixed-layer depth variations are important during certain seasons. Temperature advection plays a large role in some regions, and mesoscale eddies mainly contribute a small scale noise. The decay of the SST anomalies can be represented by a linear negative feedback, and seems largely controlled by their back-interaction on the atmosphere. The importance of the feedback processes for climate predictability is stressed, as well as the seasonal variabilities in the SST anomaly dynamics.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times