A pragmatic strategy for implementing spatially correlated observation errors in an operational system: An application to Doppler radial winds
A pragmatic strategy for implementing spatially correlated observation errors in an operational system: An application to Doppler radial winds
复制标题
在操作系统中实现空间相关观测误差的实用策略:在多普勒径向风中的应用
DOI:
10.1002/qj.3592
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发表时间:
2019
影响因子:
8.9
通讯作者:
Simonin D
中科院分区:
文献类型:
--
作者:
Simonin D
Recent research has shown that high‐resolution observations, such as Doppler radar radial winds, exhibit spatial correlations. High‐resolution observations are routinely assimilated into convection‐permitting numerical weather prediction models assuming their errors are uncorrelated. To avoid violating this assumption, observation density is severely reduced. To improve the quantity of observations used and the impact that they have on the forecast requires the introduction of full, correlated, error statistics. Some operational centres have introduced satellite inter‐channel observation‐error correlations and obtained improved analysis accuracy and forecast skill scores. Here we present a strategy for implementing spatially correlated observation errors in an operational system. We then provide the first demonstration of the practical feasibility of incorporating spatially correlated Doppler radial wind error statistics in the Met Office numerical weather prediction system.Inclusion of correlated Doppler radial winds error statistics has little impact on the computation cost of the data assimilation system, even with a fourfold increase in the number of Doppler radial winds observations assimilated. Using the correlated observation‐error statistics with denser observations produces increments with shorter length‐scales than the control. Initial forecast trials show a neutral to positive impact on forecast skill overall, notably for quantitative precipitation forecasts. There is potential to improve forecast skill by optimizing the use of Doppler radial winds and applying the technique to other observation types.
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DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
John A. Lopez
通讯作者:
John A. Lopez
影响因子:
8.9
作者:
M. Yaremchuk;J. D’Addezio;G. Panteleev;G. Jacobs
通讯作者:
G. Jacobs
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
M. Dixon;Zhihong Li;H. Lean;N. Roberts;S. Ballard
通讯作者:
S. Ballard
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
M. Wlasak;M. Cullen
通讯作者:
M. Cullen
影响因子:
3.2
作者:
Joanne A. Waller;D. Simonin;S. Dance;N. Nichols;S. Ballard
通讯作者:
Joanne A. Waller;D. Simonin;S. Dance;N. Nichols;S. Ballard