biogeochemical floats in argo
TRANSCRIPT
Biogeochemical Floats in Argo
Stephen C. Riser University of Washington
Argo Steering Team Meeting
Halifax, NS 18 March 2014
BGC floats deployed in Argo
Estimated costs of BGC floats and basic sensors
a
b
c
aAanderaa 4330; SBE 63 is now being tested bMBARI ISUS; Satlantic ISUS/SUNA is more (×2?) cMBARI version; commercial version (SBE) in progress
Dissolved O2 calibration and adjustment is an active area of discussion; see results from the recent SCOR Working Group 142 Meeting
Example of a BGC data from float in the southern Indian Ocean
http://flux.ocean.washington.edu/argo
[500 T/S samples, 100 BGC samples]
Iridium antenna
Optode O2 sensor
SeaBird 41-CP CTD
ISUS (embedded in
CTD outflow)
FLBB sensor
The general configuration of BGC floats produced at UW
The Deep-Durafet pH sensor developed by MBARI for use on profiling floats
pH sensor and reference electrode (in the CTD outflow)
Profiles of pH measured near the HOT site from UW floats equipped with a deep Durafet sensor (from K. Johnson)
Energy Considerations for BGC Floats Number of Lithium Battery Packs: 4 Energy per Pack: 1300 KJ Total Energy Available: 5200 KJ Energy per Profile: 19.82 KJ Estimated Number of Profiles Possible: 262
System Energy Required (KJ) Per Cent of Total
Buoyancy pump 6.42 32.4
ISUS/NO3 3.62 18.3
SBE 41CP 3.04 15.3
Iridium-GPS 2.50 12.6
APF9i 1.99 10.0
Durafet/pH 1.28 6.5
FLBB 0.16 1.3
Optode/O2 0.10 0.5
Self-discharge 0.70 3.5
TOTAL 19.82 100
Apex T/S
Apex BGC
Navis BGCI
3 float types
Satlantic SUNA configured on a SBE Navis BGCI float
16 BGC floats to be deployed along P16 (March-May 2014)
Planned/proposed deployments as part of SOCOM (200 floats over 6 years). Basic funding from NSF, with half the floats provided by US Argo.