The Mainz profile algorithm (MAPA)

doi:10.5194/amt-12-1785-2019

2019-03-19

DOI：10.5194/amt-12-1785-2019

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摘要

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The Mainz profile algorithm (MAPA) derives vertical profiles of aerosol extinction and trace gas concentrations from MAX-DOAS measurements of slant column densities under multiple elevation angles. This paper presents (a) a detailed description of the MAPA (v0.98), (b) results for the CINDI-2 campaign, and (c) sensitivity studies on the impact of a priori assumptions such as flag thresholds. Like previous profile retrieval schemes developed at MPIC, MAPA is based on a profile parameterization combining box profiles, which also might be lifted, and exponential profiles. But in contrast to previous inversion schemes based on least-square fits, MAPA follows a Monte Carlo approach for deriving those profile parameters yielding best match to the MAX-DOAS observations. This is much faster and directly provides physically meaningful distributions of profile parameters. In addition, MAPA includes an elaborated flagging scheme for the identification of questionable or dubious results. The AODs derived with MAPA for the CINDI-2 campaign show good agreement with AERONET if a scaling factor of 0.8 is applied for 04, and the respective NO2 and HCHO surface mixing ratios match those derived from coincident long path DOAS measurements. MAPA results are robust with respect to modifications of the a priori MAPA settings within plausible limits

Keyword:

MAX-DOAS OBSERVATIONS

AEROSOL OPTICAL-PROPERTIES

ATMOSPHERIC AEROSOLS

DERIVE INFORMATION

RADIATIVE-TRANSFER

RETRIEVAL

CLOUD

CLASSIFICATION

EXTINCTION

VALIDATION

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期刊

Atmospheric Measurement Techniques

IF:

3.3

论文数:

5.4K

被引数:

1.6W

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