Moisture transport in observations and reanalyses as a proxy for snow accumulation in East Antarctica
Atmospheric moisture convergence on ice sheets provides an estimate of snow accumulation, which is critical to quantifying sea-level changes. In the case of East Antarctica, we computed moisture transport from 1980 to 2016 in five reanalyses and in radiosonde observations. Moisture convergence in re...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-13-413-2019 https://tc.copernicus.org/articles/13/413/2019/ |
id |
ftcopernicus:oai:publications.copernicus.org:tc70659 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:tc70659 2023-05-15T13:55:28+02:00 Moisture transport in observations and reanalyses as a proxy for snow accumulation in East Antarctica Dufour, Ambroise Charrondière, Claudine Zolina, Olga 2019-02-04 application/pdf https://doi.org/10.5194/tc-13-413-2019 https://tc.copernicus.org/articles/13/413/2019/ eng eng doi:10.5194/tc-13-413-2019 https://tc.copernicus.org/articles/13/413/2019/ eISSN: 1994-0424 Text 2019 ftcopernicus https://doi.org/10.5194/tc-13-413-2019 2020-07-20T16:22:57Z Atmospheric moisture convergence on ice sheets provides an estimate of snow accumulation, which is critical to quantifying sea-level changes. In the case of East Antarctica, we computed moisture transport from 1980 to 2016 in five reanalyses and in radiosonde observations. Moisture convergence in reanalyses is more consistent than net precipitation but still ranges from 72 to 96 mm yr −1 in the four most recent reanalyses, ERA-Interim, NCEP CFSR, JRA 55 and MERRA 2. The representation of long-term variability in reanalyses is also inconsistent, which justified resorting to observations. Moisture fluxes are measured on a daily basis via radiosondes launched from a network of stations surrounding East Antarctica. Observations agree with reanalyses on the major role of extreme advection events and transient eddy fluxes. Although assimilated, the observations reveal processes that reanalyses cannot model, some due to a lack of horizontal and vertical resolution, especially the oldest, NCEP DOE R2. Additionally, the observational time series are not affected by new satellite data unlike the reanalyses. We formed pan-continental estimates of convergence by aggregating anomalies from all available stations. We found statistically significant trends neither in moisture convergence nor in precipitable water. Text Antarc* Antarctica East Antarctica Copernicus Publications: E-Journals East Antarctica Merra ENVELOPE(12.615,12.615,65.816,65.816) The Cryosphere 13 2 413 425 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Atmospheric moisture convergence on ice sheets provides an estimate of snow accumulation, which is critical to quantifying sea-level changes. In the case of East Antarctica, we computed moisture transport from 1980 to 2016 in five reanalyses and in radiosonde observations. Moisture convergence in reanalyses is more consistent than net precipitation but still ranges from 72 to 96 mm yr −1 in the four most recent reanalyses, ERA-Interim, NCEP CFSR, JRA 55 and MERRA 2. The representation of long-term variability in reanalyses is also inconsistent, which justified resorting to observations. Moisture fluxes are measured on a daily basis via radiosondes launched from a network of stations surrounding East Antarctica. Observations agree with reanalyses on the major role of extreme advection events and transient eddy fluxes. Although assimilated, the observations reveal processes that reanalyses cannot model, some due to a lack of horizontal and vertical resolution, especially the oldest, NCEP DOE R2. Additionally, the observational time series are not affected by new satellite data unlike the reanalyses. We formed pan-continental estimates of convergence by aggregating anomalies from all available stations. We found statistically significant trends neither in moisture convergence nor in precipitable water. |
format |
Text |
author |
Dufour, Ambroise Charrondière, Claudine Zolina, Olga |
spellingShingle |
Dufour, Ambroise Charrondière, Claudine Zolina, Olga Moisture transport in observations and reanalyses as a proxy for snow accumulation in East Antarctica |
author_facet |
Dufour, Ambroise Charrondière, Claudine Zolina, Olga |
author_sort |
Dufour, Ambroise |
title |
Moisture transport in observations and reanalyses as a proxy for snow accumulation in East Antarctica |
title_short |
Moisture transport in observations and reanalyses as a proxy for snow accumulation in East Antarctica |
title_full |
Moisture transport in observations and reanalyses as a proxy for snow accumulation in East Antarctica |
title_fullStr |
Moisture transport in observations and reanalyses as a proxy for snow accumulation in East Antarctica |
title_full_unstemmed |
Moisture transport in observations and reanalyses as a proxy for snow accumulation in East Antarctica |
title_sort |
moisture transport in observations and reanalyses as a proxy for snow accumulation in east antarctica |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-413-2019 https://tc.copernicus.org/articles/13/413/2019/ |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
East Antarctica Merra |
geographic_facet |
East Antarctica Merra |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-13-413-2019 https://tc.copernicus.org/articles/13/413/2019/ |
op_doi |
https://doi.org/10.5194/tc-13-413-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
2 |
container_start_page |
413 |
op_container_end_page |
425 |
_version_ |
1766262118261194752 |