Integrated transports

Timeseries

12-hourly, 10-day low pass filtered transport timeseries from April 1st 2004 to March 2014.

Figure 1:Ten-day (colours) and three month low-pass (black) timeseries of Florida Straits transport (blue), Ekman transport (black), upper mid-ocean transport (magenta), and overturning transport (red) for the period 2nd April 2004 to mid- March 2014. Florida Straits transport is based on electromagnetic cable measurements; Ekman transport is based on ERA winds. The upper mid-ocean transport, based on the RAPID time series, is the vertical integral of the transport per unit depth down to the deepest northward velocity (~1100 m) on each day. Overturning transport is then the sum of the Florida Straits, Ekman, and upper mid-ocean transports and represents the maximum northward transport of upper-layer waters on each day. Positive transports correspond to northward flow.
Figure 2:Layer transports for thermocline recirculation (red) in the depth range (0 to 800m), Intermdiate (green) in the depth range 800 to 1100m, Upper North Atlantic Deep Water in the depth range 1100 to 3000 m (light blue), and Lower North Atlantic Deep Water in the depth range 3000 to 5000 m (dark blue). The sum of the Upper and Lower North Atlantic Deep Water Transports is the lower limb of the overturning. The correlation to the AMOC in Figure 1 is R=-0.9958. Negative transports correspond to southward flow. Statistics for these timeseries are Mean±SD : Gulf Stream 31.6±3.1 Sv; Ekman 3.2±3.4 Sv; Upper mid-ocean -17.2±3.5 Sv; MOC : 17.4±4.9 Sv; UNADW -12.0±2.7 Sv; LNADW -7.1±3.1 Sv.

Details about the calculation of the transport timeseries can be found in Cunningham et al. (2007).

The data for the transport series are available in NETCDF,
Matlab or ASCII format.


Vertical MOC transport profiles

12-hourly, 2-day low pass filtered vertical MOC profiles from April 1st 2004 to March 22nd 2014.
Figure 2: Vertical MOC structure from April 2004 to March 2014.