气候变化领域集成服务门户(CCPortal): Zonally resolved water vapour coupling with tropical tropopause temperature: Seasonal and interannual variability; and influence of the Walker circulation

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DOI	10.1007/s00382-020-05255-w
	Zonally resolved water vapour coupling with tropical tropopause temperature: Seasonal and interannual variability; and influence of the Walker circulation
	Suneeth K.V.; Das S.S.
发表日期	2020
ISSN	0930-7575
起始页码	4657
结束页码	4673
卷号	54
英文摘要	Global stratospheric water vapour is strongly coupled to the tropical cold-point tropopause temperatures. We quantified the coupling between temperature and water vapour in the TTL on seasonal and interannual time scale using 10 years of satellite based observations, focusing on the zonal asymmetries arising from the Walker circulation. Tropical region (15° N–15° S) shows near perfect correlation values in the TTL (between ~ 15.5 km to CPT) at ascending branches of Walker circulation, indicating a strong coupling between annual cycles of cold-point and water vapour variability. Descending branches of Walker circulation are characterized by weak temperature-water vapour coupling and local lapse-rate minima at about 1–1.5 km below CPT level. The correlation pattern of deseasonalized anomalies of temperature and water vapour shows a strong zonal asymmetry, with maximum correlation values (r ~ 0.7 to 0.9) in the TTL (between 15 km and cold-point level) over Maritime Continents including western Pacific Ocean (90° E–180° E), and Atlantic Ocean (0–50° W) and minimum values (r ~ 0.2 to 0.4) over eastern Pacific and Indian Ocean. The QBO amplitude in CPT-T is more or less zonally symmetric, with peak value over the Maritime Continent and Atlantic Ocean. During ENSO event, CPT-T over the western Pacific and Maritime Continent are largely influenced with warm anomaly. Associate with this CPT-T variation, large enhancement in WMR100 is noticed over the Indian Ocean between 20° N–20° S latitude. The difference between zonal mean deseasonalized anomalies of WMR100 and SMRcpt show significant fluctuations (± 0.3 ppmv) that are roughly coincide with the Oceanic Niño Index with a 6 month lag. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Saturation mixing ratio; Tropical tropopause; Walker circulation; Water vapour
语种	英语
scopus关键词	air temperature; amplitude; annual variation; quantitative analysis; seasonal variation; tropical meteorology; tropopause; Walker circulation; water vapor; Atlantic Ocean; Indian Ocean; Pacific Ocean
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145456
作者单位	Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum, 695022, India
推荐引用方式 GB/T 7714	Suneeth K.V.,Das S.S.. Zonally resolved water vapour coupling with tropical tropopause temperature: Seasonal and interannual variability; and influence of the Walker circulation[J],2020,54.
APA	Suneeth K.V.,&Das S.S..(2020).Zonally resolved water vapour coupling with tropical tropopause temperature: Seasonal and interannual variability; and influence of the Walker circulation.Climate Dynamics,54.
MLA	Suneeth K.V.,et al."Zonally resolved water vapour coupling with tropical tropopause temperature: Seasonal and interannual variability; and influence of the Walker circulation".Climate Dynamics 54(2020).