AOSN-II Objective Analyses

Spatial Decay (km) Spatial Zero Crossing (km) Temporal Decay (day)

Synoptic 15 37.5 10

Mean 45 112.5 1000

The fields below were produced by the HOPS Objective Analysis of the AOSN-II data. The OA utilizes the Gauss-Markov or minimum error variance criterion to map the available data to horizontal grids (Carter and Robinson, 1987; Robinson, 1996). For each field below, all data acquired in within a 72 hour time span surrounding the central dates of 5 August, 15 August and 23 August (i.e. 36 hours before and after 217.0 for 5 August) were blended in a two-scale analysis. This data consists of: Pt. Sur CTD, John Martin CTD, WHOI Gliders, SIO Gliders and NPS aircraft SST. The scales used in the analytic correlation appear in the table at right.

When viewing each field (Temperature, Salinity) one should simultaneously examine the corresponding error field. Where the error field is lower, the field is nearer to an observation and hence more representative of the actual ocean state. Further from these low error regions, the mapped field is an OA extension.

Temperature

Salinity

Temperature Error

Salinity Error