In Situ Analysis System - Global T-S analysis

ISAS basic products are gridded fields of temperature and salinity based on in-situ measurements over the period covered by the ARGO network.

  

To plot ISAS horizontal maps of fields and anomalies:

<ISAS-maps> 

Methodology

ISAS (In Situ Analysis System), is an optimal interpolation tool developped to synthesize the golobal dataset of Argo profiles. Complementary data are also taken into account. ISAS is used in research mode at LPO and in operational mode by Coriolis.

Climatology and climate indices

Vertical integrals of heat content and streric height anomalies are used to illustrate the changes observed by the network. The horizontal distribution of the changes is estimated by comparing the 2004-2012 ISAS13 average to long term estimates. Time series of the volume average over the period is another index to monitor the state of the ocean.

Data access

The 3-D ISAS13 monthly fields and climatology are proposed in NetCdf format..

North Atlantic T/S

A summary of recent conditions in the North Atlantic is updated annually. It ihas been established using the ARGO global observing system based on profiling floats, complemented by CTDs and mooring data available at Coriolis datacenter.
Near surface, the year 2012 appears as an extreme in the 2002-2012 decade for the cold winter observed in the Labrador Sea and the Irminger Sea where temperatures went well below the climatological mean. The warm summer that extends over most of the basin except in the South-East part is clearly seen in the surface cycles but remains within the variability of this period. A negative salinity anomaly is building up west of 20°W. It started in 2009 in the centre of the basin, in 2012, a large fresh anomaly, 0.5 PSS below the ‘normal’ WOA05 conditions, is observed (see illustration).
At depth (1000 m), the main points already noted in the previous years are confirmed:
The Greenland Sea, the Labrador Sea and the Irminger Sea are warmer than normal and this is a clear tendency since 2002.
The Mediterranean Outflow water seems warmer and saltier west of the Iberian peninsula.