P0035.6.3

TS_Uncertainties, more detailled

P0035.6.3 product shows the air timeserie and target's uncertainties, for each site/instrument/samplingHeight/species. From top to bottom: the air hourly mean molar fraction, the air hourly standard deviation, the target's CMR uncertainties, the LTR uncertainties and the short term target bias.

Details:

• Data used: air and target data (hourly mean)
• Uncertainties: for details and explanations about the calculation of CMR uncertainties, the LTR uncertainties and the short term target bias, see Camille Yver-Kwok's paper [doi:10.5194/amt-8-3867-2015]
• Blue line: Mace Head (MHD) marine sector air data, smoothed with NOAA's CCGCRV function.
• Timeframe: as described in header's subtitle (generally one rolling year).
• Species: as described in plot's title.

P0035.6.3 product shows the air timeseries and target's uncertainties, for each site/instrument/ sampling height/species.

From top to bottom: 6 panels.

Pan.1: "Ambient air" - Timeseries (black/red points) since the station is labelled of the considered species, for a specific measurement level. Time resolution for ambient air plot is hour. Also plotted (when available) is Mace Head Marine Smooth in blue.

Pan.2: "H2O" - Timeseries of water vapor concentration (black/red points) on the same period as pan.1.

Pan.3: "Standard Deviation" - Associated hourly standard deviation of the species plotted in pan.1, computed with minute data.

Pan.4: "CMRUncertainty" - It is the Continuous Measurement Repeatability commonly called precision. It is a repeatability measure applied to continuous measurements. The CMR is computed as the average over 24 hours of the computed standard deviation of minute short term target means.

Pan.5: "LTRUncertainty" - It is Long-Term Repeatability which was commonly called reproducibility in the atmospheric community and it is a repeatability measure over an extended period of time. The LTR is computed as the standard deviation of the computed average of injection short term target means over 72 hours.

Note that for "CMRUncertainty" and "LTRUncertainty", the metrics follow the International Vocabulary of Metrology guidelines (VIM, http://www.bipm.org/en/publications/guides/vim.html) and the Global Atmosphere Watch guidelines (GAW, http://gaw.empa.ch/glossary/glossary.html#section_2). Average periods are centered on the data.

Pan.6: "Bias" - Bias is computed for Short-Term Target (STTGT, black) and Long-Term Target (LTTGT, gray). It is the difference between the target assigned value and the measured injection mean, for hour means.

For all panels, black data are data with "O" flags and red data are data with "U" flags. Additionally, for LTTGT, "U" flags are orange points. Calibration scale changes are indicated with a blue vertical line. Target changes are indicated with a green vertical line.