Impact of reflecting land surface on radiation environment over Hornsund, Spitsbergen – a model study for cloudless skies
This paper addresses the influence of land topography and cover on 3D radiative effects under cloudless skies in the Hornsund area, Spitsbergen, Svalbard. The authors used Monte Carlo simulations of solar radiation transfer over a heterogeneous surface to study the impact of a non-uniform surface on...
Published in: | Polish Polar Research |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Polish Academy of Sciences
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1515/popore-2017-0008 https://doaj.org/article/fbbe62884e814d348747a3522ac69e88 |
id |
ftdoajarticles:oai:doaj.org/article:fbbe62884e814d348747a3522ac69e88 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:fbbe62884e814d348747a3522ac69e88 2023-05-15T13:11:59+02:00 Impact of reflecting land surface on radiation environment over Hornsund, Spitsbergen – a model study for cloudless skies Rozwadowska Anna Górecka Izabela 2017-06-01T00:00:00Z https://doi.org/10.1515/popore-2017-0008 https://doaj.org/article/fbbe62884e814d348747a3522ac69e88 EN eng Polish Academy of Sciences http://www.degruyter.com/view/j/popore.2017.38.issue-2/popore-2017-0008/popore-2017-0008.xml?format=INT https://doaj.org/toc/2081-8262 2081-8262 doi:10.1515/popore-2017-0008 https://doaj.org/article/fbbe62884e814d348747a3522ac69e88 Polish Polar Research, Vol 38, Iss 2, Pp 149-174 (2017) Arctic Svalbard fjord irradiance transmittance aerosol radiative forcing nadir radiance Monte Carlo modelling Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.1515/popore-2017-0008 2022-12-31T10:56:26Z This paper addresses the influence of land topography and cover on 3D radiative effects under cloudless skies in the Hornsund area, Spitsbergen, Svalbard. The authors used Monte Carlo simulations of solar radiation transfer over a heterogeneous surface to study the impact of a non-uniform surface on: (1) the spatial distribution of irradiance transmittance at the fjord surface under cloudless skies; (2) the spectral shortwave aerosol radiative forcing at the fjord surface; (3) normalized nadir radiance at the Top Of the Atmosphere (TOA) over the fjord. The modelled transmittances and radiances over the fjord are compared to the transmittances and radiances over the open ocean under the same conditions. The dependence of the 3D radiative effects on aerosol optical thickness, aerosol type, surface albedo distribution, solar azimuth and zenith angle and spectral channel is discussed. The analysis was done for channels 3 (459-479 nm) and 2 (841-876 nm) of the MODIS radiometer. In the simulations a flat water surface was assumed. The study shows that snow-covered land surrounding the fjord strongly modifies the radiation environment over the fjord surface. The enhancement of the mean irradiance transmittance over the fjord with respect to the open ocean is up to 0.06 for channel 3. The enhancement exceeds 0.11 in the vicinity of sunlit cliffs. The influence of the snow-covered land on the TOA radiance over the fjord in channel 3 is comparable to the impact of an increase in aerosol optical thickness of over 100%, and in lateral fjords of up to several hundred percent. The increase in TOA radiance is wavelength dependent. These effects may affect retrievals of aerosol optical thickness. Article in Journal/Newspaper albedo Arctic Hornsund Polar Research Svalbard Spitsbergen Directory of Open Access Journals: DOAJ Articles Arctic Svalbard Hornsund ENVELOPE(15.865,15.865,76.979,76.979) Polish Polar Research 38 2 149 174 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic Svalbard fjord irradiance transmittance aerosol radiative forcing nadir radiance Monte Carlo modelling Geology QE1-996.5 |
spellingShingle |
Arctic Svalbard fjord irradiance transmittance aerosol radiative forcing nadir radiance Monte Carlo modelling Geology QE1-996.5 Rozwadowska Anna Górecka Izabela Impact of reflecting land surface on radiation environment over Hornsund, Spitsbergen – a model study for cloudless skies |
topic_facet |
Arctic Svalbard fjord irradiance transmittance aerosol radiative forcing nadir radiance Monte Carlo modelling Geology QE1-996.5 |
description |
This paper addresses the influence of land topography and cover on 3D radiative effects under cloudless skies in the Hornsund area, Spitsbergen, Svalbard. The authors used Monte Carlo simulations of solar radiation transfer over a heterogeneous surface to study the impact of a non-uniform surface on: (1) the spatial distribution of irradiance transmittance at the fjord surface under cloudless skies; (2) the spectral shortwave aerosol radiative forcing at the fjord surface; (3) normalized nadir radiance at the Top Of the Atmosphere (TOA) over the fjord. The modelled transmittances and radiances over the fjord are compared to the transmittances and radiances over the open ocean under the same conditions. The dependence of the 3D radiative effects on aerosol optical thickness, aerosol type, surface albedo distribution, solar azimuth and zenith angle and spectral channel is discussed. The analysis was done for channels 3 (459-479 nm) and 2 (841-876 nm) of the MODIS radiometer. In the simulations a flat water surface was assumed. The study shows that snow-covered land surrounding the fjord strongly modifies the radiation environment over the fjord surface. The enhancement of the mean irradiance transmittance over the fjord with respect to the open ocean is up to 0.06 for channel 3. The enhancement exceeds 0.11 in the vicinity of sunlit cliffs. The influence of the snow-covered land on the TOA radiance over the fjord in channel 3 is comparable to the impact of an increase in aerosol optical thickness of over 100%, and in lateral fjords of up to several hundred percent. The increase in TOA radiance is wavelength dependent. These effects may affect retrievals of aerosol optical thickness. |
format |
Article in Journal/Newspaper |
author |
Rozwadowska Anna Górecka Izabela |
author_facet |
Rozwadowska Anna Górecka Izabela |
author_sort |
Rozwadowska Anna |
title |
Impact of reflecting land surface on radiation environment over Hornsund, Spitsbergen – a model study for cloudless skies |
title_short |
Impact of reflecting land surface on radiation environment over Hornsund, Spitsbergen – a model study for cloudless skies |
title_full |
Impact of reflecting land surface on radiation environment over Hornsund, Spitsbergen – a model study for cloudless skies |
title_fullStr |
Impact of reflecting land surface on radiation environment over Hornsund, Spitsbergen – a model study for cloudless skies |
title_full_unstemmed |
Impact of reflecting land surface on radiation environment over Hornsund, Spitsbergen – a model study for cloudless skies |
title_sort |
impact of reflecting land surface on radiation environment over hornsund, spitsbergen – a model study for cloudless skies |
publisher |
Polish Academy of Sciences |
publishDate |
2017 |
url |
https://doi.org/10.1515/popore-2017-0008 https://doaj.org/article/fbbe62884e814d348747a3522ac69e88 |
long_lat |
ENVELOPE(15.865,15.865,76.979,76.979) |
geographic |
Arctic Svalbard Hornsund |
geographic_facet |
Arctic Svalbard Hornsund |
genre |
albedo Arctic Hornsund Polar Research Svalbard Spitsbergen |
genre_facet |
albedo Arctic Hornsund Polar Research Svalbard Spitsbergen |
op_source |
Polish Polar Research, Vol 38, Iss 2, Pp 149-174 (2017) |
op_relation |
http://www.degruyter.com/view/j/popore.2017.38.issue-2/popore-2017-0008/popore-2017-0008.xml?format=INT https://doaj.org/toc/2081-8262 2081-8262 doi:10.1515/popore-2017-0008 https://doaj.org/article/fbbe62884e814d348747a3522ac69e88 |
op_doi |
https://doi.org/10.1515/popore-2017-0008 |
container_title |
Polish Polar Research |
container_volume |
38 |
container_issue |
2 |
container_start_page |
149 |
op_container_end_page |
174 |
_version_ |
1766249865731375104 |