Acknowledgments

Colleagues at CSIRO Atmospheric Research and the CRC for Southern Hemisphere Meteorology have contributed greatly to the results and perspectives aired here. Paul Steele provided valuable comments on this manuscript. We thank the IAEA and WMO

GLOBALHUBS-

Global Quality Control for Long-Lived Trace Gas Measurements

(several)

(several)

CAPEGRIM/ CAPESCHANCK BASELINE AIR

CAPEGRIM/ CAPESCHANCK BASELINE AIR

"Circulators"

"Oscillators"

"ICR"

"Circulators"

"Oscillators"

"ICR"

"GH Tanks" (via"DECANTERS";

HUBLaboratory CAL.HUB

primary scales, GLOBALVIEW

PREP. HUB provide air standards

FIGURE 5 Proposed international comparision strategy for laboratories measuring long-lived atmospheric trace gases in air. Identification of laboratories is nominal only for support in developing the GLOBALIIUBS strategy, the WMO

for permission to include round-robin results in press, and CMDL

and INSTAAR for the use of ICP results.

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