Spatiotemporal exposure modeling of ambient erythemal ultraviolet radiation

Table 1 Data sources used in ATP residual kriging to downscale NASA UV_Ery in the U.S. (1998–2012)

Variable	Unit	Spatial resolution	Temporal resolution	Source
Outcome: UV_Ery grids	mW/m²	Approx. 100 × 100 km	Daily	NASA TOMS/OMI^a
Predictors
Surface albedo	1	70 × 50 km	Monthly	MERRA
Aerosol optical depth (AOD)	1	70 × 50 km	Daily	MERRA
Cloud cover	1	70 × 50 km	Daily	MERRA
Dew point	°F	4 × 4 km	Monthly	PRISM
Elevation	m	10 × 10 m	Updated^b	USGS 3DEP
Latitude	km	1 × 1 km	n/a	Manually created
Ozone	Dobson	70 × 50 km	Monthly	MERRA
Surface incoming shortwave flux (SIS)	W/m²	70 × 50 km	Monthly	MERRA
Sulfur dioxide (SO₂)	kg/m²	70 × 50 km	Monthly	MERRA

Abbreviations: 3DEP 3D Elevation Program, MERRA Modern Era Retrospective Analysis for Research and Applications, NASA National Aeronautics and Space Administration, OMI Ozone Monitoring Instrument, PRISM Parameter elevation Regression on Independent Slopes Model, TOMS Total Ozone Mapping Spectrometer, USGS U.S. Geological Survey
^aFor the TOMS sensor, the following data products were downloaded corresponding to the Nimbus-7 and Earth Probe satellites: TOMSN7L3:Erythemal_timeAveraged and TOMSEPL3:Erythemal_timeAveraged. The following data product was downloaded from the OMI sensor (Aura satellite): OMUVBd:ErythemalDoseRate_timeAveraged
^bUSGS 3DEP data are continuously updated as new elevation sources are acquired. Data from August 2015 were acquired for this study

ISSN: 1476-069X