Tropical Highlights

  Table of Atmospheric Indices  (Table 1)

  Table of Oceanic Indices  (Table 2)

  Time Series

  Time-Longitude Sections

  Mean & Anomaly Fields

  Appendix 1: Outside Contributions

• Tropical Drifting Buoys  A1.1
  
• Thermistor Chain Data  A1.2
  
• TAO/TRITON Array (a)  A1.3
  
• TAO/TRITON Array (b)  A1.4
  
• East Pac. SST & Sea Level  A1.5
  
• Pacific Wind stress  A1.6
  
• Surface Currents (a)  A1.7
  
• Surface Currents (b)  A1.8
  
  

Tropical Pacific Drifting Buoys

Rick Lumpkin / Mayra Pazos, AOML, Miami

AUGUST 2007

During August 2007, 303 satellite-tracked surface drifting buoys, 71% with subsurface drogues attached for measuring mixed layer currents, were reporting from the tropical Pacific. The strongest current anomalies were likely associated with the well-developed TIW train on and north of the equator. Weaker, but basin-wide, westward anomalies of 10-20 cm/s were measured between 10-20S. In the northern tropical Pacific, currents were near their climatological August strengths. Drifters west of 160W measured slightly warm SST, with anomalies of +0.5C to +1.5C common. East of 160W, SSTs were close to climatology (apart from very cold anomalies measured by drifters at 130-140W, 4-6N, associated with TIW advection of equatorial cold water).

FIGURE A1.1 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 1993-2002 (gray), and currents measured by the drogued buoys this month (black) smoothed by an optimal filter. c) Bottom: Anomalies from the climatological monthly mean currents for this month.