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Using MAN and Coastal AERONET Measurements to Assess the Suitability of MODIS C6.1 Aerosol Optical Depth for Monitoring Changes from Increased Arctic Shipping

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Document pages: 28 pages

Abstract: Collocated data of the moderate resolution imaging spectroradiometer (MO-DIS) Collection 6.1aerosol optical depths (AOD) at 3 km × 3 km north of 59.9°N overocean were assessed at 550 nm by aerosol robotic network (AERONET) data from coastalsites and marine aerosol network (MAN) data from vessels during June to October2006 to 2018. Typically, MODIS AOD was higher at low and lower at high values than the AERONET AOD. Discrepancieswere largest for sites where the Earth’s surface around the site is veryheterogeneous (Canadian Archipelago, coast of Greenland). Due to the higherlikelihood for sea-ice, MAN and MODIS AOD differed stronger west of Greenlandand over the Beaufort Sea than at location in the Greenland and Norwegian Seasand Atlantic. MODIS AOD well captured the inter-seasonal variability found inthe AERONET AOD data (R = 0.933). At all sites, MO-DIS and AERONET AOD agreement improved as timeprogressed in the shipping season, hinting at errors in sea-ice vs. open waterclassification. Overall 75.3 of the MODIS AOD data fell within the limits ofthe error envelops of the AERONET MAN AOD data with MAN ranging between 87.5 and 100 . Changes in both MODIS and AERONET mean AOD between two periods ofsame length (2006-2011, 2013-2018) were explainable by changes in emissions forall sites.

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