Seasonality of aerosol optical properties in the Arctic

Schmeisser, L.; Backman, J.; Ogren, J. A.; Andrews, E.; Asmi, E.; Starkweather, S.; Uttal, T.; Fiebig, M.; Sharma, S.; Eleftheriadis, K.; Vratolis, S.; Bergin, M.; Tunved, P.; Jefferson, A.

doi:10.5194/acp-18-11599-2018

Back to Previous Page

Seasonality of aerosol optical properties in the Arctic

2018

By Schmeisser, L. ; Backman, J. ; Ogren, J. A. ; ...

Source: Atmospheric Chemistry and Physics, 18(16), 11599-11622.

[PDF-7.74 MB]

Select the Download button to view the document

This document is over 5mb in size and cannot be previewed

Details Related Documents You May Also Like

Personal Author:

Schmeisser, L. ; Backman, J. ; Ogren, J. A. ; Andrews, E. ; Asmi, E. ; ... More +

NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PSL (Physical Sciences Laboratory) ; ESRL (Earth System Research Laboratory) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; GML (Global Monitoring Laboratory) ;

Description:

Given the sensitivity of the Arctic climate to short-lived climate forcers, long-term in situ surface measurements of aerosol parameters are useful in gaining insight into the magnitude and variability of these climate forcings. Seasonality of aerosol optical properties - including the aerosol light-scattering coefficient, absorption coefficient, single-scattering albedo, scattering Angstrom exponent, and asymmetry parameter - are presented for six monitoring sites throughout the Arctic: Alert, Canada; Barrow, USA; Pallas, Finland; Summit, Greenland; Tiksi, Russia; and Zeppelin Mountain, Ny-Alesund, Svalbard, Norway. Results show annual variability in all parameters, though the seasonality of each aerosol optical property varies from site to site. There is a large diversity in magnitude and variability of scattering coefficient at all sites, reflecting differences in aerosol source, transport, and removal at different locations throughout the Arctic. Of the Arctic sites, the highest annual mean scattering coefficient is measured at Tiksi (12.47 Mm(-1)), and the lowest annual mean scattering coefficient is measured at Summit (1.74 Mm(-1)). At most sites, aerosol absorption peaks in the winter and spring, and has a minimum throughout the Arctic in the summer, indicative of the Arctic haze phenomenon; however, nuanced variations in seasonalities suggest that this phenomenon is not identically observed in all regions of the Arctic. The highest annual mean absorption coefficient is measured at Pallas (0.48 Mm(-1)), and Summit has the lowest annual mean absorption coefficient (0.12 Mm(-1)). At the Arctic monitoring stations analyzed here, mean annual single-scattering albedo ranges from 0.909 (at Pallas) to 0.960 (at Barrow), the mean annual scattering Angstrom exponent ranges from 1.04 (at Barrow) to 1.80 (at Summit), and the mean asymmetry parameter ranges from 0.57 (at Alert) to 0.75 (at Summit). Systematic variability of aerosol optical properties in the Arctic supports the notion that the sites presented here measure a variety of aerosol populations, which also experience different removal mechanisms. A robust conclusion from the seasonal cycles presented is that the Arctic cannot be treated as one common and uniform environment but rather is a region with ample spatiotemporal variability in aerosols. This notion is important in considering the design or aerosol monitoring networks in the region and is important for informing climate models to better represent short-lived aerosol climate forcers in order to yield more accurate climate predictions for the Arctic.

Source:

Atmospheric Chemistry and Physics, 18(16), 11599-11622.

DOI:

http://dx.doi.org/10.5194/acp-18-11599-2018

Document Type:

Journal Article ;

Rights Information:

CC BY

Main Document Checksum:

[+]

File Type:

No Additional Files

More +

Seasonality of aerosol optical properties in the Arctic

Details:

Supporting Files

Related Documents

You May Also Like