Improved Reanalysis and Prediction of Atmospheric Fields Over the Southern Ocean Using Campaign‐Based Radiosonde Observations

Sato, Kazutoshi; Inoue, Jun; Alexander, Simon P.; McFarquhar, Greg; Yamazaki, Akira

doi:10.1029/2018GL079037

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Improved Reanalysis and Prediction of Atmospheric Fields Over the Southern Ocean Using Campaign‐Based Radiosonde Observations

2018
By Sato, Kazutoshi ; Inoue, Jun ; Alexander, Simon P. ; ...
Source: Geophysical Research Letters (2018) 45(20): 11406-11413.

[PDF-3.11 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Sato, Kazutoshi ; Inoue, Jun ; Alexander, Simon P. ; McFarquhar, Greg ; Yamazaki, Akira

Sato, Kazutoshi ; Inoue, Jun ; Alexander, Simon P. ; McFarquhar, Greg ; Yamazaki, Akira Less -
NOAA Program & Office:

NOAA Cooperative Institutes ; CIMMS (Cooperative Institute for Mesoscale Meteorological Studies) ; OAR (Oceanic and Atmospheric Research) ; NSSL (National Severe Storms Laboratory)

NOAA Cooperative Institutes ; CIMMS (Cooperative Institute for Mesoscale Meteorological Studies) ; OAR (Oceanic and Atmospheric Research) ; NSSL (National Severe Storms Laboratory) Less -
Description:

This study investigated the impact of radiosonde observations from the Southern Ocean obtained by the Australian R/V Aurora Australis on the ALERA2 experimental ensemble reanalysis data set and ensemble forecast experiment. An observing system experiment (OSE) that included additional ship‐launched radiosonde data captured the atmospheric structure over the Southern Ocean. ALERA2 without additional radiosondes had positive temperature biases exceeding 7 °C in the upper troposphere when low‐pressure cyclonic systems passed over the ship. The spread in the upper level was reduced by 15% in the OSE, which propagated downstream from the ship's position because of the sparse observing network over southern high latitudes. Comparison of two 63‐member ensemble forecast experiments initialized by ALERA2 and the OSE revealed that prediction of midlatitude cyclone tracks was improved by the realistic representation of upper‐level troughs in the OSE forecast. This confirms that additional radiosondes over the Southern Ocean reduce uncertainty and error in midlatitude cyclone forecasts.
Keywords:

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Cyclones Numerical Weather Forecasting
Source:

Geophysical Research Letters (2018) 45(20): 11406-11413.
DOI:

https://doi.org/10.1029/2018GL079037
Document Type:

Journal Article
Place as Subject:

Antarctic Ocean
Rights Information:

CC BY-NC-ND
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Submitted
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urn:sha256:0342fae9c3bf31353d5b475d7c052ae44786a341fda045278243f6ae9e006ea1
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https://repository.library.noaa.gov/view/noaa/25692/noaa_25692_DS1.pdf
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Improved Reanalysis and Prediction of Atmospheric Fields Over the Southern Ocean Using Campaign‐Based Radiosonde Observations

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