Data Homogenization Results from Three NOAA Long-term ECC Ozonesonde Records
Abstract
The NOAA Electrochemical Concentration Cell (ECC) balloon-borne ozonesonde data record for Boulder, Colorado; Pago Pago, American Samoa; and Hilo, Hawaii sites were homogenized in 2017 to adjust and account for a number of changes in ozonesonde procedures and manufacturer model adjustments over their 25-32 year records. The profile screening, editing, sensor background corrections, and application of transfer functions based on laboratory tests comparing sensing solution compositions used in the past, improved the ozonesonde data with an average 1-sigma uncertainty of ±4-6% in the stratosphere and ±5-20% in the troposphere. A comparison of the sonde total column ozone (TCO) with co-located Dobson spectrophotometers for the sites showed consistent agreement within ±5% for >70% of the ozonesondes TCO. However, the Hilo ozonesonde TCO suddenly dropped 5% lower than the Dobson Spectrophotometer measurements from Mauno Loa after 2015. Further tests to investigate this difference included: a dual ozonesonde comparison at Hilo in 2018, new pump flow rate calibration tests at low pressures in the NOAA environmental simulation chamber, and additional sensor solution tests in the laboratory and ambient surface. The dual sonde flight at Hilo, using the most recent 2018 manufacturer model ozonesondes, showed excellent agreement with the Dobson Spectrophotometer thus suggesting that the year of manufacturing/model numbers may be the cause for the discrepancy. Additional tests on the earlier versus newer ozonesonde manufacturer models will be presented.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A31I2959J
- Keywords:
-
- 0340 Middle atmosphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0394 Instruments and techniques;
- ATMOSPHERIC COMPOSITION AND STRUCTURE