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DOI10.1175/JCLI-D-18-0243.1
On the Dynamical Mechanisms Governing El Nino-Southern Oscillation Irregularity
Berner, Judith1; Sardeshmukh, Prashant D.2; Christensen, Hannah M.1
2018-10-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2018
卷号31期号:20页码:8401-8419
文章类型Article
语种英语
国家USA
英文摘要

This study investigates the mechanisms by which short time-scale perturbations to atmospheric processes can affect El Nino-Southern Oscillation (ENSO) in climate models. To this end a control simulation of NCAR's Community Climate System Model is compared to a simulation in which the model's atmospheric diabatic tendencies are perturbed every time step using a Stochastically Perturbed Parameterized Tendencies (SPPT) scheme. The SPPT simulation compares better with ECMWF's twentieth-century reanalysis in having lower interannual sea surface temperature (SST) variability and more irregular transitions between El Nino and La Nina states, as expressed by a broader, less peaked spectrum. Reduced-order linear inverse models (LIMs) derived from the 1-month lag covariances of selected tropical variables yield good representations of tropical interannual variability in the two simulations. In particular, the basic features of ENSO are captured by the LIM's least damped oscillatory eigenmode. SPPT reduces the damping time scale of this eigenmode from 17 to 11 months, which is in better agreement with the 8 months obtained from reanalyses. This noise-induced stabilization is consistent with perturbations to the frequency of the ENSO eigenmode and explains the broadening of the SST spectrum (i.e., the greater ENSO irregularity). Although the improvement in ENSO shown here was achieved through stochastic physics parameterizations, it is possible that similar improvements could be realized through changes in deterministic parameterizations or higher numerical resolution. It is suggested that LIMs could provide useful insight into model sensitivities, uncertainties, and biases also in those cases.


英文关键词ENSO Oscillations Model errors Stochastic models Interannual variability Tropical variability
领域气候变化
收录类别SCI-E
WOS记录号WOS:000444223000003
WOS关键词GENERAL-CIRCULATION MODEL ; SEA-SURFACE TEMPERATURES ; ENSEMBLE PREDICTION SYSTEM ; WESTERLY WIND EVENTS ; PATTERN-ANALYSIS ; ENSO PREDICTION ; TROPICAL PACIFIC ; PREDICTABILITY ; VARIABILITY ; NOISE
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/19536
专题气候变化
作者单位1.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA;
2.Cooperat Inst Res Environm Sci, Boulder, CO USA
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Berner, Judith,Sardeshmukh, Prashant D.,Christensen, Hannah M.. On the Dynamical Mechanisms Governing El Nino-Southern Oscillation Irregularity[J]. JOURNAL OF CLIMATE,2018,31(20):8401-8419.
APA Berner, Judith,Sardeshmukh, Prashant D.,&Christensen, Hannah M..(2018).On the Dynamical Mechanisms Governing El Nino-Southern Oscillation Irregularity.JOURNAL OF CLIMATE,31(20),8401-8419.
MLA Berner, Judith,et al."On the Dynamical Mechanisms Governing El Nino-Southern Oscillation Irregularity".JOURNAL OF CLIMATE 31.20(2018):8401-8419.
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