Preprint Article Version 1 This version is not peer-reviewed

An Overview of Hand held Sun Photometer Measurements of Atmospheric Aerosols in New Orleans, Louisiana: A case study of the Xavier University Study Site

Version 1 : Received: 28 April 2018 / Approved: 30 April 2018 / Online: 30 April 2018 (12:28:29 CEST)

How to cite: Bradley, M.; Sevalia, B.; Gaseller, M. An Overview of Hand held Sun Photometer Measurements of Atmospheric Aerosols in New Orleans, Louisiana: A case study of the Xavier University Study Site. Preprints 2018, 2018040381 (doi: 10.20944/preprints201804.0381.v1). Bradley, M.; Sevalia, B.; Gaseller, M. An Overview of Hand held Sun Photometer Measurements of Atmospheric Aerosols in New Orleans, Louisiana: A case study of the Xavier University Study Site. Preprints 2018, 2018040381 (doi: 10.20944/preprints201804.0381.v1).

Abstract

Aerosol optical depth (AOT) was measured at Xavier University of Louisiana (29.96ᵒ N, 90.11ᵒ W and about 3m above sea level) using a hand-held sun photometer. AOT was measured at two different wavelengths (green at 505nm and red at 625nm) during the period from Sept-2017 to Feb-2018. In this study, we investigate the relationship between AOT and temperature, precipitation, barometric pressure and relative humidity. The maximum monthly average value for green AOT was 0.176 (measured in September) and the minimum monthly value is 0.040 (measured in January). For the red AOT the maximum monthly average value was 0.123 (measured in September) and the minimum is 0.034 (measured in December). The AOT–temperature relationship was predominantly positive, meaning that high AOT values correspond to high temperatures and low AOT values correspond to low temperatures. Relationship between AOT and rainfall is negative, meaning high rainfall averages are associated with low AOT values. AOT and atmospheric pressure have a predominantly negative relationship. The relationship between relative humidity and AOT is a complicated one and is hard to qualify as relative humidity varies very little during the study period.

Subject Areas

Sun photometer, Aerosols, Aerosol Optical Depth (AOT), New Orleans

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