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Argo observes physical variability of the global ocean’s upper 2 km.

The Argo Project Gregory C. Johnson PMEL (http://floats.pmel.noaa.gov) Stephen Riser UW Oceanography (http://runt.ocean.washington.edu/argo). Argo observes physical variability of the global ocean’s upper 2 km. US Argo partners: AOML, FNMOC, PMEL, SIO, UW, and WHOI.

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Argo observes physical variability of the global ocean’s upper 2 km.

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  1. The Argo ProjectGregory C. JohnsonPMEL(http://floats.pmel.noaa.gov)Stephen RiserUW Oceanography(http://runt.ocean.washington.edu/argo) • Argo observes physical variability of the global ocean’s upper 2 km. • US Argo partners: AOML, FNMOC, PMEL, SIO, UW, and WHOI. • UW and PMEL work together on Argo through JISAO. • UW leads on ship chartering for US Argo and deploys about 120 floats/year. • PMEL leads delayed mode salinity QC for Argo and deploys about 80 floats/year.

  2. UW has provided PMEL assistance with starting up a float lab. • UW and PMEL have shared staffing and pooled floats for deployment cruises. • UW and PMEL have cooperated on scientific analysis and delayed mode QC of float data. Black – Active, non-NIWA deployed Blue – Active, NIWA deployed Green – Planned Red - Hypothetical • UW, with JISAO assistance for NZ ship chartering, has led in South Pacific Float deployments • PMEL, with JISAO assistance (both scientific and in data management), has led in delayed-mode salinity quality control. • UW and PMEL each deploy significant numbers of Argo floats (combined 25% of total effort)

  3. Argo (~2003) vs. WOCE (1985-1995) Comparisons (courtesy of Li Ren and Stephen Riser) • Argo (2003) - WOCE P1 (47N, 1985) salt differences on isopycnals (left) reveal sub polar -S freshening • What are the time-scales for such variations? • An isopycnal slice for the basin (26.7 kg m-3, left) is limited by WOCE, but should be complete in the future. • This analysis gives a hint at Argo data value • Argo coverage will be basin-wide and seasonal

  4. (2) A salinity anomaly is injected, likely by strong evaporation (with latent cooling). (4) Salt and temperature are diffused into the pycnocline on longer time-scales. (1) The South Pacific Eastern Subtropical Mode Water is renewed in 2004 (20S, 110W) (3) The salinity anomaly destabilizes the water column for double diffusion

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