Tropical Pacific Drifting Buoys
Rick Lumpkin / Mayra Pazos, AOML, Miami
During October 2013, 295 satellite-tracked surface drifting buoys, 82% with
subsurface drogues attached for measuring mixed layer currents, were reporting
from the tropical Pacific. The drifters indicated that the major currents were
close to their climatological October strengths, with the eastward NECC shifted
slightly (one-half to one degree latitude) north of its climatological position.
a) Top: Movements of drifting buoys in the tropical Pacific Ocean.
The linear segments of each trajectory represent a one week displacement.
Trajectories of buoys which have lost their subsurface drogues are gray; those with
drogues are blue.
b) Middle: Monthly mean currents calculated from all buoys 1993-2010 (gray),
and currents measured by the drogued buoys this month (black) smoothed by an
c) Bottom: Anomalies from the climatological monthly mean currents for this month.