气候变化领域集成服务门户(CCPortal): Impact of Atmospheric and Model Physics Perturbations on a High-Resolution Ensemble Data Assimilation System of the Red Sea

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DOI	10.1029/2019JC015611
	Impact of Atmospheric and Model Physics Perturbations on a High-Resolution Ensemble Data Assimilation System of the Red Sea
	Sanikommu S.; Toye H.; Zhan P.; Langodan S.; Krokos G.; Knio O.; Hoteit I.
发表日期	2020
ISSN	21699275
卷号	125 期号:8
英文摘要	The Ensemble Adjustment Kalman Filter of the Data Assimilation Research Testbed is implemented to assimilate observations of satellite sea surface temperature, altimeter sea surface height, and in situ ocean temperature and salinity profiles into an eddy-resolving 4 km Massachusetts Institute of Technology general circulation model of the Red Sea. We investigate the impact of three different ensemble generation strategies: (1) Iexp—uses ensemble of ocean states to initialize the model on 1 January 2011 and inflates filter error covariance by 10%; (2) IAexp—adds ensemble of atmospheric forcing to Iexp; and (3) IAPexp—adds perturbed model physics to IAexp. The assimilation experiments are run for 1 year, starting from the same initial ensemble and assimilating data every 3 days. Results demonstrate that the Iexp mainly improved the model outputs with respect to assimilation-free Massachusetts Institute of Technology general circulation model run in the first few months, before showing signs of dynamical imbalances in the ocean estimates, particularly in the data-sparse subsurface layers. The IAexp yielded substantial improvements throughout the assimilation period with almost no signs of imbalances, including the subsurface layers. It further well preserved the model mesoscale features resulting in an improved forecast for eddies, both in terms of intensity and location. Perturbing model physics in IAPexp slightly improved the forecast statistics and also the placement of basin-scale eddies. Increasing hydrographic coverage further improved the results of IAPexp compared to IAexp in the subsurface layers. Switching off multiplicative inflation in IAexp and IAPexp leads to further improvements, especially in the subsurface layers. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	eddy-resolving MITgcm; ensemble atmospheric forcing; ensemble data assimilation; inflation; perturbed model physics; Red Sea
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186732
作者单位	King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
推荐引用方式 GB/T 7714	Sanikommu S.,Toye H.,Zhan P.,et al. Impact of Atmospheric and Model Physics Perturbations on a High-Resolution Ensemble Data Assimilation System of the Red Sea[J],2020,125(8).
APA	Sanikommu S..,Toye H..,Zhan P..,Langodan S..,Krokos G..,...&Hoteit I..(2020).Impact of Atmospheric and Model Physics Perturbations on a High-Resolution Ensemble Data Assimilation System of the Red Sea.Journal of Geophysical Research: Oceans,125(8).
MLA	Sanikommu S.,et al."Impact of Atmospheric and Model Physics Perturbations on a High-Resolution Ensemble Data Assimilation System of the Red Sea".Journal of Geophysical Research: Oceans 125.8(2020).