Chemical Meters/Analyzers
type: Concept

Picarro G1301-m
type: Concept
change note: 2022-01-06 15:48:24.0 [tstevens] Insert Concept add broader relation (Picarro G1301-m [b64520ad-868a-4382-babf-4a2dcee18b2c,836013] - Chemical Meters/Analyzers [3d25724b-832f-4a61-b0b2-4f2ccecdba94,827335]);
definition: Traditional techniques for measuring greenhouse gas inventories in the well-mixed atmosphere have required extremely dry sample gas streams (dew point < -60°C) to achieve the inter-laboratory comparability standard set forth by the WMO for carbon dioxide (100 ppb) and methane (2ppb). Drying the sample gas to low water vapor levels can be both expensive and prone to problems, especially at remote sites where access is difficult. The Picarro G1301 three-species greenhouse gas analyzers for the first time permit accurate and precise greenhouse gas measurements that can meet the WMO inter-laboratory comparability standard without drying the sample gas. Below, we present direct measurements of t he water vapor correction factors that, when applied to the G1301 data, enable drygas mixing ratio measurements without the need for low-level drying or frequent calibration. In addition, we confirm these results with careful spectroscopic analysis, and we estimate the uncertainties remaining in the measurement of t he drygas mixing ratios.
in scheme: instruments