Evaluating Arctic cloud radiative effects simulated by NICAM with A‐train
Evaluation of cloud radiative effects (CREs) in global atmospheric models is of vital importance to reduce uncertainties in weather forecasting and future climate projection. In this paper, we describe an effective way to evaluate CREs from a 3.5 km mesh global nonhydrostatic model by comparing it a...
Published in: | Journal of Geophysical Research: Atmospheres |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2016
|
Subjects: | |
Online Access: | https://oacis.repo.nii.ac.jp/?action=repository_uri&item_id=1746 http://id.nii.ac.jp/1342/00001714/ |
id |
fttokyounivmst:oai:oacis.repo.nii.ac.jp:00001746 |
---|---|
record_format |
openpolar |
spelling |
fttokyounivmst:oai:oacis.repo.nii.ac.jp:00001746 2023-07-23T04:13:04+02:00 Evaluating Arctic cloud radiative effects simulated by NICAM with A‐train Hashino Tempei Satoh Masaki Hagihara Yuichiro Kato Seiji Kubota Takuji Matsui Toshihisa Nasuno Tomoe Okamoto Hajime Sekiguchi Miho 2016-06 https://oacis.repo.nii.ac.jp/?action=repository_uri&item_id=1746 http://id.nii.ac.jp/1342/00001714/ en eng American Geophysical Union https://doi.org/10.1002/2016JD024775 https://oacis.repo.nii.ac.jp/?action=repository_uri&item_id=1746 http://id.nii.ac.jp/1342/00001714/ Journal of Geophysical Research: Atmospheres, 121, 7041-7063(2016-06) 2169-897X AA10819765 15K17759 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016JD024775 https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-15K17759/ https://nrid.nii.ac.jp/ja/nrid/1000000377079/ model evaluation A‐train global cloud‐resolving model satellite data simulator cloud radiative effects cloud microphysics 科学研究費研究成果 高解像度気候計算のための広帯域放射伝達モデルの革新的研究 Journal Article 2016 fttokyounivmst https://doi.org/10.1002/2016JD024775 2023-07-01T19:49:05Z Evaluation of cloud radiative effects (CREs) in global atmospheric models is of vital importance to reduce uncertainties in weather forecasting and future climate projection. In this paper, we describe an effective way to evaluate CREs from a 3.5 km mesh global nonhydrostatic model by comparing it against A-train satellite data. The model is the Nonhydrostatic Icosahedral Atmospheric Model (NICAM), and its output is run through a satellite-sensor simulator (Joint Simulator for satellite sensors) to produce the equivalent CloudSat radar, CALIPSO lidar, and Aqua Clouds and the Earth’s Radiant Energy System (CERES) data. These simulated observations are then compared to real observations from the satellites. Wefocus on the Arctic, which is a region experiencing rapid climate change over various surface types. The NICAM simulation significantly overestimates the shortwave CREs at top of atmosphere and surface as large as 24Wm-2 for themonth of June. The CREs were decomposed into cloud fractions and footprint CREs of cloud types that are defined based on the CloudSat-CALIPSO cloud top temperature and maximum radar reflectivity. It turned out that the simulation underestimates the cloud fraction and optical thickness of mixed-phase clouds due to predicting too little supercooled liquid and predicting overly large snow particles with too little mass content. This bias was partially offset by predicting too many optically thin high clouds. Offline sensitivity experiments, where cloud microphysical parameters, surface albedo, and single scattering parameters are varied, support the diagnosis. Aerosol radiative effects and nonspherical single scattering of ice particles should be introduced into the NICAM broadband calculation for further improvement. Article in Journal/Newspaper albedo Arctic Climate change TUMSAT-OACIS (Tokyo University of Marine Science and Technology: Open Access Collection of International and Scholarly Papers) Arctic Journal of Geophysical Research: Atmospheres 121 12 7041 7063 |
institution |
Open Polar |
collection |
TUMSAT-OACIS (Tokyo University of Marine Science and Technology: Open Access Collection of International and Scholarly Papers) |
op_collection_id |
fttokyounivmst |
language |
English |
topic |
model evaluation A‐train global cloud‐resolving model satellite data simulator cloud radiative effects cloud microphysics 科学研究費研究成果 高解像度気候計算のための広帯域放射伝達モデルの革新的研究 |
spellingShingle |
model evaluation A‐train global cloud‐resolving model satellite data simulator cloud radiative effects cloud microphysics 科学研究費研究成果 高解像度気候計算のための広帯域放射伝達モデルの革新的研究 Hashino Tempei Satoh Masaki Hagihara Yuichiro Kato Seiji Kubota Takuji Matsui Toshihisa Nasuno Tomoe Okamoto Hajime Sekiguchi Miho Evaluating Arctic cloud radiative effects simulated by NICAM with A‐train |
topic_facet |
model evaluation A‐train global cloud‐resolving model satellite data simulator cloud radiative effects cloud microphysics 科学研究費研究成果 高解像度気候計算のための広帯域放射伝達モデルの革新的研究 |
description |
Evaluation of cloud radiative effects (CREs) in global atmospheric models is of vital importance to reduce uncertainties in weather forecasting and future climate projection. In this paper, we describe an effective way to evaluate CREs from a 3.5 km mesh global nonhydrostatic model by comparing it against A-train satellite data. The model is the Nonhydrostatic Icosahedral Atmospheric Model (NICAM), and its output is run through a satellite-sensor simulator (Joint Simulator for satellite sensors) to produce the equivalent CloudSat radar, CALIPSO lidar, and Aqua Clouds and the Earth’s Radiant Energy System (CERES) data. These simulated observations are then compared to real observations from the satellites. Wefocus on the Arctic, which is a region experiencing rapid climate change over various surface types. The NICAM simulation significantly overestimates the shortwave CREs at top of atmosphere and surface as large as 24Wm-2 for themonth of June. The CREs were decomposed into cloud fractions and footprint CREs of cloud types that are defined based on the CloudSat-CALIPSO cloud top temperature and maximum radar reflectivity. It turned out that the simulation underestimates the cloud fraction and optical thickness of mixed-phase clouds due to predicting too little supercooled liquid and predicting overly large snow particles with too little mass content. This bias was partially offset by predicting too many optically thin high clouds. Offline sensitivity experiments, where cloud microphysical parameters, surface albedo, and single scattering parameters are varied, support the diagnosis. Aerosol radiative effects and nonspherical single scattering of ice particles should be introduced into the NICAM broadband calculation for further improvement. |
format |
Article in Journal/Newspaper |
author |
Hashino Tempei Satoh Masaki Hagihara Yuichiro Kato Seiji Kubota Takuji Matsui Toshihisa Nasuno Tomoe Okamoto Hajime Sekiguchi Miho |
author_facet |
Hashino Tempei Satoh Masaki Hagihara Yuichiro Kato Seiji Kubota Takuji Matsui Toshihisa Nasuno Tomoe Okamoto Hajime Sekiguchi Miho |
author_sort |
Hashino Tempei |
title |
Evaluating Arctic cloud radiative effects simulated by NICAM with A‐train |
title_short |
Evaluating Arctic cloud radiative effects simulated by NICAM with A‐train |
title_full |
Evaluating Arctic cloud radiative effects simulated by NICAM with A‐train |
title_fullStr |
Evaluating Arctic cloud radiative effects simulated by NICAM with A‐train |
title_full_unstemmed |
Evaluating Arctic cloud radiative effects simulated by NICAM with A‐train |
title_sort |
evaluating arctic cloud radiative effects simulated by nicam with a‐train |
publisher |
American Geophysical Union |
publishDate |
2016 |
url |
https://oacis.repo.nii.ac.jp/?action=repository_uri&item_id=1746 http://id.nii.ac.jp/1342/00001714/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
albedo Arctic Climate change |
genre_facet |
albedo Arctic Climate change |
op_source |
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016JD024775 https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-15K17759/ https://nrid.nii.ac.jp/ja/nrid/1000000377079/ |
op_relation |
https://doi.org/10.1002/2016JD024775 https://oacis.repo.nii.ac.jp/?action=repository_uri&item_id=1746 http://id.nii.ac.jp/1342/00001714/ Journal of Geophysical Research: Atmospheres, 121, 7041-7063(2016-06) 2169-897X AA10819765 15K17759 |
op_doi |
https://doi.org/10.1002/2016JD024775 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
121 |
container_issue |
12 |
container_start_page |
7041 |
op_container_end_page |
7063 |
_version_ |
1772176388934074368 |