Remote sensing of aerosols in the Arctic for an evaluation of global climate model simulations


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Marion.Maturilli [ at ] awi.de

Abstract

In this study MODerate resolution Imaging Spectroradiometer (MODIS) Aqua retrievals of aerosol optical thickness (AOT) at 555 nm are compared to sun-photometer measurements from Svalbard for a period of 9 years. For the 642 daily coincident measurements that were obtained, MODIS AOT generally varies within the predicted uncertainty of the retrieval over ocean (ΔAOT = ±0.03 ± 0.05 · AOT). The results from the remote sensing have been used to examine the accuracy in estimates of aerosol optical properties in the Arctic, generated by global climate models and from in-situ measurements at the Zeppelin station, Svalbard. AOT simulated with the Norwegian Earth System Model (NorESM1-M)/ CAM4-Oslo global climate model does not reproduce the observed seasonal variability of the Arctic aerosol. The model overestimates clear-sky AOT by nearly a factor of 2 for the background summer season, while tending to underestimate the values in the spring season. Furthermore, large differences in all-sky AOT of up to one order of magnitude are found for the Coupled Model Intercomparison Project (CMIP5) model ensemble for the spring and summer seasons. Large differences between satellite/ground-based remote sensing of AOT and AOT estimated from dry and humidified scattering coefficients are found for the subarctic marine boundary layer in summer.



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Article
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Programs
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Research Networks
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
35814
DOI 10.1002/2013JD021279

Cite as
Glantz, P. , Bourassa, A. , Herber, A. , Iversen, T. , Karlsson, J. , Kirkevåg, A. , Maturilli, M. , Seland, Ø. , Stebel, K. , Struthers, H. , Tesche, M. and Thomason, L. (2014): Remote sensing of aerosols in the Arctic for an evaluation of global climate model simulations , Journal of Geophysical Research-Atmospheres, 119 (13), pp. 8169-8188 . doi: 10.1002/2013JD021279


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