Precipitation over the Southern Ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements
Precipitation is still a poorly known variable in the Southern Ocean/Antarctica due to the lack of measurements. Unique precipitation measurements were carried out during the Swiss Polar Institute"s Antarctic Circumnavigation Expedition (ACE) (December 2016 - March 2017). High temporal resoluti...
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ftinfoscience:oai:infoscience.epfl.ch:292646 2023-05-15T13:04:19+02:00 Precipitation over the Southern Ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements Luis, Diogo Gorodetskaya, Irina Leonard, Katherine Schlosser, Elisabeth Vignon, Etienne Ralph, F. Martin Lehning, Michael 2022-03-11T08:37:50Z https://infoscience.epfl.ch/record/292646/files/EGU21-13544-print.pdf http://infoscience.epfl.ch/record/292646 unknown https://infoscience.epfl.ch/record/292646/files/EGU21-13544-print.pdf http://infoscience.epfl.ch/record/292646 http://infoscience.epfl.ch/record/292646 Text 2022 ftinfoscience 2023-02-13T23:09:09Z Precipitation is still a poorly known variable in the Southern Ocean/Antarctica due to the lack of measurements. Unique precipitation measurements were carried out during the Swiss Polar Institute"s Antarctic Circumnavigation Expedition (ACE) (December 2016 - March 2017). High temporal resolution measurements of precipitation were performed by a Snow Particle Counter (SPC) and by a micro rain radar (MRR) aboard the RV Akademik Tryoshnikov. Radiosondes were launched periodically to observe the vertical structure of the atmosphere. Additionally, MRR and radiosonde measurements from Dumont D"Urville station (DDU) were available when the expedition was in the Mertz Glacier region. These data offer a rare opportunity to evaluate model and reanalysis products performance in a region without regular precipitation measurements. In this study, ECMWF"s ERA5 reanalysis product and Antarctic Mesoscale Prediction System (AMPS) model data are evaluated using ACE and DDU in-situ observations. Two snowfall events that occurred around Mertz Glacier during the ACE campaign were chosen to compare ERA5 and AMPS data with in-situ measurements. The first event on 2 February 2017 was associated with an extratropical cyclone east of Adelie Land and a moderate along-shore moisture transport. The second event on 8-10 February 2017 was associated with a cyclone west of Mertz blocked by a high-pressure ridge, directing an intense moisture transport (identified as an atmospheric river) and precipitation to DDU. To assess if ERA5 reanalysis and AMPS (Antarctic Mesoscale Prediction System using Polar-WRF model) are able to represent these different types of precipitation events, we analyse the differences in precipitation amount between in-situ, model and reanalysis data and compare modelled vertical profiles with radiosonde measurements. Text Adelie Land Antarc* Antarctic Antarctica Mertz Glacier Southern Ocean Swiss Polar Institute EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Antarctic Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) Southern Ocean |
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Open Polar |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
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ftinfoscience |
language |
unknown |
description |
Precipitation is still a poorly known variable in the Southern Ocean/Antarctica due to the lack of measurements. Unique precipitation measurements were carried out during the Swiss Polar Institute"s Antarctic Circumnavigation Expedition (ACE) (December 2016 - March 2017). High temporal resolution measurements of precipitation were performed by a Snow Particle Counter (SPC) and by a micro rain radar (MRR) aboard the RV Akademik Tryoshnikov. Radiosondes were launched periodically to observe the vertical structure of the atmosphere. Additionally, MRR and radiosonde measurements from Dumont D"Urville station (DDU) were available when the expedition was in the Mertz Glacier region. These data offer a rare opportunity to evaluate model and reanalysis products performance in a region without regular precipitation measurements. In this study, ECMWF"s ERA5 reanalysis product and Antarctic Mesoscale Prediction System (AMPS) model data are evaluated using ACE and DDU in-situ observations. Two snowfall events that occurred around Mertz Glacier during the ACE campaign were chosen to compare ERA5 and AMPS data with in-situ measurements. The first event on 2 February 2017 was associated with an extratropical cyclone east of Adelie Land and a moderate along-shore moisture transport. The second event on 8-10 February 2017 was associated with a cyclone west of Mertz blocked by a high-pressure ridge, directing an intense moisture transport (identified as an atmospheric river) and precipitation to DDU. To assess if ERA5 reanalysis and AMPS (Antarctic Mesoscale Prediction System using Polar-WRF model) are able to represent these different types of precipitation events, we analyse the differences in precipitation amount between in-situ, model and reanalysis data and compare modelled vertical profiles with radiosonde measurements. |
format |
Text |
author |
Luis, Diogo Gorodetskaya, Irina Leonard, Katherine Schlosser, Elisabeth Vignon, Etienne Ralph, F. Martin Lehning, Michael |
spellingShingle |
Luis, Diogo Gorodetskaya, Irina Leonard, Katherine Schlosser, Elisabeth Vignon, Etienne Ralph, F. Martin Lehning, Michael Precipitation over the Southern Ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements |
author_facet |
Luis, Diogo Gorodetskaya, Irina Leonard, Katherine Schlosser, Elisabeth Vignon, Etienne Ralph, F. Martin Lehning, Michael |
author_sort |
Luis, Diogo |
title |
Precipitation over the Southern Ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements |
title_short |
Precipitation over the Southern Ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements |
title_full |
Precipitation over the Southern Ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements |
title_fullStr |
Precipitation over the Southern Ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements |
title_full_unstemmed |
Precipitation over the Southern Ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements |
title_sort |
precipitation over the southern ocean: synoptic analysis and model evaluation using ground-based remote sensing and in-situ measurements |
publishDate |
2022 |
url |
https://infoscience.epfl.ch/record/292646/files/EGU21-13544-print.pdf http://infoscience.epfl.ch/record/292646 |
long_lat |
ENVELOPE(144.500,144.500,-67.667,-67.667) |
geographic |
Antarctic Mertz Glacier Southern Ocean |
geographic_facet |
Antarctic Mertz Glacier Southern Ocean |
genre |
Adelie Land Antarc* Antarctic Antarctica Mertz Glacier Southern Ocean Swiss Polar Institute |
genre_facet |
Adelie Land Antarc* Antarctic Antarctica Mertz Glacier Southern Ocean Swiss Polar Institute |
op_source |
http://infoscience.epfl.ch/record/292646 |
op_relation |
https://infoscience.epfl.ch/record/292646/files/EGU21-13544-print.pdf http://infoscience.epfl.ch/record/292646 |
_version_ |
1766357221036261376 |