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DOI10.1175/JCLI-D-18-0755.1
Role of Sea Surface Salinity Feedback in MJO Predictability: A Study with CFSv2
Zhu, Jieshun1,2; Kumar, Arun2
2019-09-01
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2019
卷号32期号:18页码:5745-5759
文章类型Article
语种英语
国家USA
英文摘要

While previous studies suggested that salinity could feed back onto MJO variability via modulating upper ocean stratification and further on SST, there is no direct evidence yet proving (or disproving) the importance of this feedback in MJO evolution and its predictability. This study is an initial attempt to quantify the role of SSS feedback on MJO predictability, based on a "perfect model" framework with the CFSv2. Specifically, the SSS feedback is isolated by nudging model SSS to climatological states during forecasts. For comparison, two more experiments were done, one as a benchmark experiment by estimating MJO predictability in CFSv2 and another one for estimating the role of SST feedback. Analyses of these experiments indicate that SSS feedback exerts negligible influences on MJO predictability within the constraints of the model, in contrast to significant impacts from SST feedback. Further analysis showed that a lack of SSS influence in MJO predictability can be attributed to marginal changes in SST associated with the SSS nudging. However, there is a caveat to the conclusion about SSS feedback. Because the barrier layer (BL) acts as a "bridge" for possible SSS influences on SST over the tropical Indian and western Pacific oceans, its simulation in CFSv2 is further explored. Analyses indicate that, in spite of realistic simulations of the MJO and intraseasonal SSS variability in CFSv2, significant BL simulation biases are present in the tropical oceans, including too thin a climatological thickness, too small intraseasonal variations, and an unrealistic intraseasonal BL-SST relationship. Thus, our predictability experiments cannot reject the hypothesis that SSS does play a role in MJO predictability; it is possible that biases in CFSv2 influence its ability to capture such signals.


英文关键词Madden-Julian oscillation Air-sea interaction Climate prediction Salinity Coupled models Intraseasonal variability
领域气候变化
收录类别SCI-E
WOS记录号WOS:000480612900003
WOS关键词MADDEN-JULIAN OSCILLATION ; PACIFIC WARM POOL ; BARRIER-LAYER ; WESTERN PACIFIC ; INDIAN-OCEAN ; INTRASEASONAL VARIABILITY ; MIXED-LAYER ; TEMPERATURE ; DYNAMICS ; IMPACT
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/186767
专题气候变化
作者单位1.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA;
2.NOAA, NWS, NCEP, Climate Predict Ctr, College Pk, MD 20740 USA
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Zhu, Jieshun,Kumar, Arun. Role of Sea Surface Salinity Feedback in MJO Predictability: A Study with CFSv2[J]. JOURNAL OF CLIMATE,2019,32(18):5745-5759.
APA Zhu, Jieshun,&Kumar, Arun.(2019).Role of Sea Surface Salinity Feedback in MJO Predictability: A Study with CFSv2.JOURNAL OF CLIMATE,32(18),5745-5759.
MLA Zhu, Jieshun,et al."Role of Sea Surface Salinity Feedback in MJO Predictability: A Study with CFSv2".JOURNAL OF CLIMATE 32.18(2019):5745-5759.
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