Citation:

PANGAEA.900919

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Abstract:

From January 2016 until August 2018, an automated Long-Path Differential Optical Absorption Spectroscopy (LP-DOAS) instrument was operated at the German research station Neumayer III (NMIII) in coastal Antarctica to measure trace gas mixing ratios in the boundary layer close to the ground (average altitude above the snow surface: 4m). Two different atmospheric light paths with total lengths of 3100 m and 5900m were used depending on visibility.

The DOAS evaluation of I2 was performed between 532.5 and 549 nm. Fits with residual optical density RMS (root mean square) values larger than 4.0e-4 were discarded. The resulting mean residual RMS is 2.3e-4. The mean detection limit is 78 pmol/mol.

The data sets include the observations below the respective detection limit scattered around 0, which due to the spectral analysis with the DOAS approach can include negative values.

I2 was not detected above a 3-sigma detection limit. Since total errors and hence detection limits are determined from spectral information, the detection limit of I2 can serve as an upper limit for an atmospheric presence.

The mixing ratios provided here were calculated using meteorological data from Neumayer III station already published on PANGAEA. A list of data sets is included in the "Related to" section of the bibliography this data set is part of.

The spectral raw data of the measurements is stored on the measurement data server of the Institute of Environmental Physics, University of Heidelberg.

Further details:

Nasse, Jan-Marcus (2019): Halogens in the coastal boundary layer of Antarctica [dissertation]. University of Heidelberg, https://doi.org/10.11588/HEIDOK.00026489

Nasse, Jan-Marcus; Eger, P G; Pöhler, Denis; Schmitt, S; Frieß, Udo; Platt, Ulrich (2019): Recent improvements of long-path DOAS measurements: impact on accuracy and stability of short-term and automated long-term observations. Atmospheric Measurement Techniques, 12(8), 4149-4169, https://doi.org/10.5194/amt-12-4149-2019

Coverage:

Latitude: -70.650000 * Longitude: -8.250000

Date/Time Start: 2016-01-18T11:48:17 * Date/Time End: 2018-08-10T01:39:34

Minimum Elevation: 42.0 m * Maximum Elevation: 42.0 m

Event(s):

Neumayer_SPUSO * Latitude: -70.650000 * Longitude: -8.250000 * Date/Time: 1983-01-01T00:00:00 * Elevation: 42.0 m * Location: Dronning Maud Land, Antarctica * Campaign: * Basis: NEUMAYER III * Method/Device: (SPUSO)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DATE/TIME	Date/Time		Nasse, Jan-Marcus		Geocode
2	Iodine, molecular mixing ratio	I2 mix ratio	pmol/mol	Nasse, Jan-Marcus	Long-Path Differential Optical Absorption Spectroscopy (LP-DOAS)
3	Iodine, molecular mixing ratio, error	I2 mix ratio e	±	Nasse, Jan-Marcus	Long-Path Differential Optical Absorption Spectroscopy (LP-DOAS)
4	Detection level	dl		Nasse, Jan-Marcus		I2 in pmol/mol
5	Iodine, molecular	I2	1/cm³	Nasse, Jan-Marcus	Long-Path Differential Optical Absorption Spectroscopy (LP-DOAS)
6	Iodine, molecular, error	I2 e	±	Nasse, Jan-Marcus	Long-Path Differential Optical Absorption Spectroscopy (LP-DOAS)
7	Detection level	dl		Nasse, Jan-Marcus		I2 in molec/cm**3
8	Date/time start	Date/time start		Nasse, Jan-Marcus		of spectra aquisition
9	Date/time end	Date/time end		Nasse, Jan-Marcus		of spectra aquisition
10	Total atmospheric light path	Light path	m	Nasse, Jan-Marcus		of measurement
11	Method comment	Method comm		Nasse, Jan-Marcus		Spectral region of the DOAS evaluation [nm]

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

80940 data points

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