Assessment of Southern Ocean clouds and aerosols in the New Zealand Earth System Model using shipborne and ground-based observations
One of the primary objectives of the New Zealand Earth System Model (NZESM) is to reduce shortwave radiation biases over the Southern Ocean, which are related to deficiencies in representation of clouds and aerosols in this region. This is a subject of active research with multiple hypotheses being...
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ftzenodo:oai:zenodo.org:5635689 2023-05-15T18:24:34+02:00 Assessment of Southern Ocean clouds and aerosols in the New Zealand Earth System Model using shipborne and ground-based observations Kuma, Peter McDonald, Adrian Morgenstern, Olaf Hartery, Sean Harvey, Mike Parsons, Simon 2017-11-13 https://zenodo.org/record/5635689 https://doi.org/10.5281/zenodo.5635689 eng eng doi:10.5281/zenodo.5635688 https://zenodo.org/record/5635689 https://doi.org/10.5281/zenodo.5635689 oai:zenodo.org:5635689 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/lecture presentation 2017 ftzenodo https://doi.org/10.5281/zenodo.563568910.5281/zenodo.5635688 2023-03-10T23:11:11Z One of the primary objectives of the New Zealand Earth System Model (NZESM) is to reduce shortwave radiation biases over the Southern Ocean, which are related to deficiencies in representation of clouds and aerosols in this region. This is a subject of active research with multiple hypotheses being tested including cloud microphysics, cloud–aerosol interaction, horizontal homogeneity and differences in the frequency of cloud regimes related to different weather systems being examined. Comparison with observations is necessary for the identification and resolution of these deficiencies. Unfortunately, observations in the Southern Ocean are scarce, with satellites providing the most extensive spatial and temporal coverage, especially instruments such as MODIS and ISCCP and active instruments such as radar and lidar (laser lidar) on the CloudSat and CALIPSO satellites. However, these instruments lack the capability to observe low-level cloud when there is a higher-level overlapping cloud. We present a multi-year dataset of shipborne and ground-based ceilometer, radar and aerosol observations in the Southern Ocean, which allows for cloud to be seen ‘from below’. In particular, we discuss the use the Cloud Feedback Model Intercomparison Project (CFMIP) Observation Simulator Package (COSP) to compare the ceilometer measurements with NZESM simulations. The COSP simulator currently does not support ground-based lidars with a matching wavelength, but the ACTSIM lidar simulator in COSP requires only a few modifications to support the analysis of ceilometer data. Using an instrument simulator such as COSP allows us to account for the limited view of the ceilometer and signal attenuation in the atmosphere. We apply the newly developed ceilometer simulator to the NZESM atmospheric state output in the regions of the Southern Ocean where shipborne or ground-based observations are available, and compare the resulting backscatter distribution and algorithmically derived products such as cloud base between the model and ... Conference Object Southern Ocean Zenodo Southern Ocean New Zealand |
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English |
description |
One of the primary objectives of the New Zealand Earth System Model (NZESM) is to reduce shortwave radiation biases over the Southern Ocean, which are related to deficiencies in representation of clouds and aerosols in this region. This is a subject of active research with multiple hypotheses being tested including cloud microphysics, cloud–aerosol interaction, horizontal homogeneity and differences in the frequency of cloud regimes related to different weather systems being examined. Comparison with observations is necessary for the identification and resolution of these deficiencies. Unfortunately, observations in the Southern Ocean are scarce, with satellites providing the most extensive spatial and temporal coverage, especially instruments such as MODIS and ISCCP and active instruments such as radar and lidar (laser lidar) on the CloudSat and CALIPSO satellites. However, these instruments lack the capability to observe low-level cloud when there is a higher-level overlapping cloud. We present a multi-year dataset of shipborne and ground-based ceilometer, radar and aerosol observations in the Southern Ocean, which allows for cloud to be seen ‘from below’. In particular, we discuss the use the Cloud Feedback Model Intercomparison Project (CFMIP) Observation Simulator Package (COSP) to compare the ceilometer measurements with NZESM simulations. The COSP simulator currently does not support ground-based lidars with a matching wavelength, but the ACTSIM lidar simulator in COSP requires only a few modifications to support the analysis of ceilometer data. Using an instrument simulator such as COSP allows us to account for the limited view of the ceilometer and signal attenuation in the atmosphere. We apply the newly developed ceilometer simulator to the NZESM atmospheric state output in the regions of the Southern Ocean where shipborne or ground-based observations are available, and compare the resulting backscatter distribution and algorithmically derived products such as cloud base between the model and ... |
format |
Conference Object |
author |
Kuma, Peter McDonald, Adrian Morgenstern, Olaf Hartery, Sean Harvey, Mike Parsons, Simon |
spellingShingle |
Kuma, Peter McDonald, Adrian Morgenstern, Olaf Hartery, Sean Harvey, Mike Parsons, Simon Assessment of Southern Ocean clouds and aerosols in the New Zealand Earth System Model using shipborne and ground-based observations |
author_facet |
Kuma, Peter McDonald, Adrian Morgenstern, Olaf Hartery, Sean Harvey, Mike Parsons, Simon |
author_sort |
Kuma, Peter |
title |
Assessment of Southern Ocean clouds and aerosols in the New Zealand Earth System Model using shipborne and ground-based observations |
title_short |
Assessment of Southern Ocean clouds and aerosols in the New Zealand Earth System Model using shipborne and ground-based observations |
title_full |
Assessment of Southern Ocean clouds and aerosols in the New Zealand Earth System Model using shipborne and ground-based observations |
title_fullStr |
Assessment of Southern Ocean clouds and aerosols in the New Zealand Earth System Model using shipborne and ground-based observations |
title_full_unstemmed |
Assessment of Southern Ocean clouds and aerosols in the New Zealand Earth System Model using shipborne and ground-based observations |
title_sort |
assessment of southern ocean clouds and aerosols in the new zealand earth system model using shipborne and ground-based observations |
publishDate |
2017 |
url |
https://zenodo.org/record/5635689 https://doi.org/10.5281/zenodo.5635689 |
geographic |
Southern Ocean New Zealand |
geographic_facet |
Southern Ocean New Zealand |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
doi:10.5281/zenodo.5635688 https://zenodo.org/record/5635689 https://doi.org/10.5281/zenodo.5635689 oai:zenodo.org:5635689 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.563568910.5281/zenodo.5635688 |
_version_ |
1766205255197917184 |