A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations
Marine atmospheric boundary layer clouds cover vast areas of the Southern Ocean (SO), where they are commonly organized into mesoscale cellular convection (MCC). Using 3 years of Himawari-8 geostationary satellite observations, open and closed MCC structures are identified using a hybrid convolution...
Published in: | Atmospheric Chemistry and Physics |
---|---|
Main Authors: | , , , , , |
Format: | Text |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/acp-22-2135-2022 https://acp.copernicus.org/articles/22/2135/2022/ |
id |
ftcopernicus:oai:publications.copernicus.org:acp96938 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:acp96938 2023-05-15T18:24:58+02:00 A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations Lang, Francisco Ackermann, Luis Huang, Yi Truong, Son C. H. Siems, Steven T. Manton, Michael J. 2022-02-15 application/pdf https://doi.org/10.5194/acp-22-2135-2022 https://acp.copernicus.org/articles/22/2135/2022/ eng eng doi:10.5194/acp-22-2135-2022 https://acp.copernicus.org/articles/22/2135/2022/ eISSN: 1680-7324 Text 2022 ftcopernicus https://doi.org/10.5194/acp-22-2135-2022 2022-02-21T17:22:16Z Marine atmospheric boundary layer clouds cover vast areas of the Southern Ocean (SO), where they are commonly organized into mesoscale cellular convection (MCC). Using 3 years of Himawari-8 geostationary satellite observations, open and closed MCC structures are identified using a hybrid convolutional neural network. The results of the climatology show that open MCC clouds are roughly uniformly distributed over the SO storm track across midlatitudes, while closed MCC clouds are most predominant in the southeast Indian Ocean, with a second maximum along the storm track. The ocean polar front, derived from ECMWF-ERA5 sea surface temperature gradients, is found to be aligned with the southern boundaries for both MCC types. Along the storm track, both closed and open MCCs are commonly located in post-frontal, cold air masses. The hourly classification of closed MCC reveals a pronounced daily cycle, with a peak occurring late night/early morning. Seasonally, the diurnal cycle of closed MCC is most intense during the summer months (December–February; DJF). Conversely, almost no diurnal cycle is evident for open MCC. Text Southern Ocean Copernicus Publications: E-Journals Indian Southern Ocean Atmospheric Chemistry and Physics 22 3 2135 2152 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Marine atmospheric boundary layer clouds cover vast areas of the Southern Ocean (SO), where they are commonly organized into mesoscale cellular convection (MCC). Using 3 years of Himawari-8 geostationary satellite observations, open and closed MCC structures are identified using a hybrid convolutional neural network. The results of the climatology show that open MCC clouds are roughly uniformly distributed over the SO storm track across midlatitudes, while closed MCC clouds are most predominant in the southeast Indian Ocean, with a second maximum along the storm track. The ocean polar front, derived from ECMWF-ERA5 sea surface temperature gradients, is found to be aligned with the southern boundaries for both MCC types. Along the storm track, both closed and open MCCs are commonly located in post-frontal, cold air masses. The hourly classification of closed MCC reveals a pronounced daily cycle, with a peak occurring late night/early morning. Seasonally, the diurnal cycle of closed MCC is most intense during the summer months (December–February; DJF). Conversely, almost no diurnal cycle is evident for open MCC. |
format |
Text |
author |
Lang, Francisco Ackermann, Luis Huang, Yi Truong, Son C. H. Siems, Steven T. Manton, Michael J. |
spellingShingle |
Lang, Francisco Ackermann, Luis Huang, Yi Truong, Son C. H. Siems, Steven T. Manton, Michael J. A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations |
author_facet |
Lang, Francisco Ackermann, Luis Huang, Yi Truong, Son C. H. Siems, Steven T. Manton, Michael J. |
author_sort |
Lang, Francisco |
title |
A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations |
title_short |
A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations |
title_full |
A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations |
title_fullStr |
A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations |
title_full_unstemmed |
A climatology of open and closed mesoscale cellular convection over the Southern Ocean derived from Himawari-8 observations |
title_sort |
climatology of open and closed mesoscale cellular convection over the southern ocean derived from himawari-8 observations |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-2135-2022 https://acp.copernicus.org/articles/22/2135/2022/ |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-22-2135-2022 https://acp.copernicus.org/articles/22/2135/2022/ |
op_doi |
https://doi.org/10.5194/acp-22-2135-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
3 |
container_start_page |
2135 |
op_container_end_page |
2152 |
_version_ |
1766206022711508992 |