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
  
• Pacific Wind stress  A1.2
  
• Surface Currents (a)  A1.3
  
• Surface Currents (b)  A1.4
  
  

Tropical Pacific Drifting Buoys

Rick Lumpkin / Mayra Pazos, AOML, Miami

JULY 2012

During July 2012, 311 satellite-tracked surface drifting buoys, 66% with subsurface drogues attached for measuring mixed layer currents, were reporting from the tropical Pacific. Strong eastward anomalies of order 40 cm/s were observed by a small number of drifters at both ~100W and ~150W, on and north of the equator. As seen since May, warm anomalies of +0.5 to +3.0C were measured by many drifters east of 140W in the latitude band 10N-30S, with the warmest anomalies measured by drifters off the Peruvian coast.

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 1993-2010 (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.